阅读说明：本技术 一种焦化废水净化处理装置及其方法 (Coking wastewater purification treatment device and method thereof ) 是由 杨会民 王研 刘巧霞 吴升潇 张晓欠 王武生 贺文晋 米建新 王蒙 于 2019-10-29 设计创作，主要内容包括：一种焦化废水净化处理装置及其方法,包括与废水吸附剂预混器连通且连通有吸附剂连续计量仪的吸附剂收集仓,废水吸附剂预混器通过混液循环泵连接有废水循环净化提升管,废水循环净化提升管的内部从上到下分为净化分层区,悬浮吸附区和强制混合区；废水循环净化提升管的上端出口连通有固液分离器,固液分离器上端连通有净化废水缓冲罐,下端连通有固液沉降管。将富集、改性后的吸附剂和焦化废水混合,利用吸附剂极强的吸附性对焦化废水中大量难以降解的有机物进行充分吸附处理,有效去除焦化废水中的氨氮,利用循环流化技术实现焦化废水的预处理,可大大缩短处理废水的时长,循环净化过程简单高效,可多次循环,实现低成本解决废水预处理问题。(A coking wastewater purification treatment device and a method thereof comprise an adsorbent collecting bin which is communicated with a wastewater adsorbent premixer and is communicated with a continuous adsorbent metering instrument, wherein the wastewater adsorbent premixer is connected with a wastewater circulating purification lifting pipe through a liquid mixing circulating pump, and the interior of the wastewater circulating purification lifting pipe is divided into a purification layering area, a suspension adsorption area and a forced mixing area from top to bottom; the upper end outlet of the wastewater circulating purification lifting pipe is communicated with a solid-liquid separator, the upper end of the solid-liquid separator is communicated with a purified wastewater buffer tank, and the lower end of the solid-liquid separator is communicated with a solid-liquid settling pipe. The adsorbent after enrichment and modification is mixed with coking wastewater, a large amount of organic matters which are difficult to degrade in the coking wastewater are sufficiently adsorbed and treated by utilizing the extremely strong adsorbability of the adsorbent, ammonia nitrogen in the coking wastewater is effectively removed, the pretreatment of the coking wastewater is realized by utilizing a circulating fluidization technology, the time for treating the wastewater can be greatly shortened, the circulating purification process is simple and efficient, multiple cycles can be realized, and the problem of wastewater pretreatment is solved at low cost.)

1. The utility model provides a coking wastewater purification unit which characterized in that: comprises a primary mixing system, a circulating purification system and a filter-pressing deslagging system;

the primary mixing system comprises an adsorbent collecting bin (1) with an adsorbent continuous metering instrument (11) and a wastewater adsorbent premixer (2) communicated with the adsorbent collecting bin, wherein the upper end of the wastewater adsorbent premixer (2) is provided with an adsorbent feeding port (16), a stirring unit (17) and a PH reagent feeding port (24), the adsorbent feeding port (16) is communicated with the adsorbent collecting bin (1), the wastewater adsorbent premixer (2) is also provided with a distributed PH measuring unit (26), a wastewater inlet (18) is formed in the side surface of the wastewater adsorbent premixer (2), a wastewater flow rate quantifier (19) is installed on a connecting pipeline of the wastewater inlet (18), and a mixed liquid outlet at the bottom of the wastewater adsorbent premixer (2) is connected with an inlet of a mixed liquid circulating pump (3);

the circulating purification system comprises a wastewater circulating purification lifting pipe (4) which is connected from bottom to top and is composed of a forced mixing area (37), a suspension adsorption area (38) and a purification layering area (39), the bottom of the forced mixing area (37) is provided with a main material inlet (36) communicated with a mixed liquid circulating pump (3), the outlet of the purification layering area (39) is communicated with a solid-liquid separator (5), the liquid outlet of the solid-liquid separator (5) is filtered by a waste residue filtering unit (20) and then communicated with a purified water inlet (29) of a purified wastewater buffer tank (27) through a purified wastewater outlet (21), a purified water filter screen (33) is arranged at the upper end of the purified water inlet (29) in the purified wastewater buffer tank (27), and a purified water outlet (28) is arranged on the purified wastewater buffer tank (27) at the upper end of the purified water filter screen (33), the bottom of the purified wastewater buffer tank (27) is provided with a waste liquid outlet (32) communicated with a liquid return inlet (30) of the wastewater adsorbent premixer (2), the solid outlet of the solid-liquid separator (5) is communicated with the solid-liquid settling tube (6), and the outlet of the solid-liquid settling tube (6) is communicated with the inlet of the filter-pressing slag discharge system.

2. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: the upper end in storehouse (1) is collected to the adsorbent is equipped with dust removal unit (12) that prevents that the dust from causing secondary pollution and protection unit (14) that realize adsorbent nitrogen protection and avoid spontaneous combustion, and the adsorbent is collected storehouse (1) lower extreme and is equipped with not hard up unit (15) that prevent the adsorbent bridging, and the bottom in storehouse (1) is collected to the adsorbent is equipped with powder rotary feeder (13).

3. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: a loosening liquid port (34) and a reinforced fluidization port (35) which are communicated with the mixed liquid circulating pump (3) are arranged on the pipe wall of the forced mixing zone (37) of the wastewater circulating and purifying riser (4) from top to bottom.

4. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: the filter pressing slag discharging system comprises a waste residue settling tank (7) and a waste residue separator (8) which are connected with an outlet of the solid-liquid settling pipe (6), wherein the waste residue settling tank (7) is provided with a short section (25) which is communicated with a forced mixing area (37) of the wastewater circulating purification lifting pipe (4) and is provided with one or more forced fluidization ports.

5. The coking wastewater purification treatment apparatus according to claim 4, characterized in that: the lower end of the waste residue separator (8) is also connected with a filter-pressing residue extractor (9), one end of the filter-pressing residue extractor (9) is provided with a filter-pressing water outlet (31) communicated with a purified water inlet (29) of the purified waste water buffer tank (27), and the other end is provided with a waste residue outlet (10).

6. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: a waste residue filtering unit (20) at the upper end of the solid-liquid separator (5) is provided with a washing wastewater unit (22) communicated with a purified water outlet (28).

7. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: the purified water outlet (28) is also communicated with a flushing unit (23), and the side walls of the suspension adsorption zone (38) and the solid-liquid settling tube (6) are respectively provided with a flushing port communicated with the flushing unit (23).

8. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: the working pressure of the wastewater circulating purification lifting pipe (4), the solid-liquid separator (5) and the solid-liquid settling pipe (6) is 0.01-0.30 MPa.

9. The coking wastewater purification treatment apparatus according to claim 1, characterized in that: the adsorbent collected by the adsorbent collecting bin (1) is a modified carbon material taking peat, lignite, long flame coal, coal pyrolysis semi-coke products or coal gasification carbon-containing ash residues as raw materials, and the bulk density of the modified carbon material is 1.0-1.1 g/cm³Specific surface area of more than 200cm²/g。

10. A coking wastewater purification treatment method comprises the following steps:

step 1: the adsorbent is metered by an adsorbent continuous metering instrument (11) and then enters a powder rotary feeder (13) under the action of gravity;

step 2: coking wastewater enters a wastewater adsorbent premixer (2) after being metered by a wastewater flow rate quantifier (19), a PH reagent is added from a PH reagent adding port (24), a distributed PH measuring unit (26) measures the PH value of the wastewater, when the PH value of the wastewater is adjusted to 2-4, a powder rotary feeder (13) is started to convey the metered adsorbent into the wastewater adsorbent premixer (2), a stirring unit (17) is used for stirring to fully mix the wastewater and the adsorbent in the premixer (2), and the mixed wastewater and adsorbent are conveyed into a wastewater circulating purification lifting pipe (4) through a mixing liquid circulating pump (3);

and step 3: the mixed wastewater and the adsorbent are forcibly mixed in a forced mixing area (37) in a circulating purification system (4) to complete the forced mixing of the wastewater and the adsorbent, the mixture enters a suspension adsorption area (38) to complete the further adsorption after being forcibly mixed, finally the mixture enters a solid-liquid separator (5) after being purified and layered in a purification layering area (39), the wastewater and the adsorbent are preliminarily separated after passing through the solid-liquid separator (5), the separated wastewater enters a purified wastewater buffer tank (27) after being filtered by a waste residue filtering unit (20), the purified wastewater after being filtered enters a subsequent biochemical wastewater treatment through a purified water outlet (28) after being filtered by a purified water filter screen (33), and the filtered waste liquid returns to a wastewater adsorbent premixer (2) through a liquid return inlet (30) for retreatment;

and 4, step 4: the adsorbent separated by the solid-liquid separator (5) enters a solid-liquid settling tube (6) and enters a waste residue settling tank (7) through settling, and the adsorbent which is not inactivated enters a wastewater circulating purification lifting tube (4) through a short joint (25) of the waste residue settling tank (7) for recycling; the inactivated adsorbent is finally extruded by a filter-pressing slag extractor (9) and then output through a slag extraction outlet (10), and the waste water generated in the extrusion molding of the inactivated adsorbent is discharged from a filter-pressing water discharge port (31) and then enters a purified waste water buffer tank (27) for retreatment.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a coking wastewater purification treatment device and a method thereof.

Background

China is the first major country of coke production, coke is produced in the whole country in 2018 by 4.38 million tons, and simultaneously a large amount of coking wastewater is generated in the processes of high-temperature dry distillation, gas washing, coking product recovery and the like, the wastewater is high-ammonia nitrogen organic wastewater which contains complex components such as oils, phenols, cyanides, sulfides and the like and is difficult to treat and degrade, in recent years, the environmental protection requirement is higher and higher, the wastewater treatment is not good, the environment is seriously polluted, meanwhile, high production cost is brought to enterprises, and the problem of wastewater treatment is always a difficult point and a key point of coal chemical industry enterprises.

The prior treatment of the coking wastewater mainly has the following problems: the coking wastewater contains a large amount of organic matters which are difficult to degrade and needs to be treated by chemical methods such as advanced catalytic oxidation and the like, so that the wastewater treatment cost is high, ammonia nitrogen can be effectively removed after biochemical treatment, but COD removal is limited and chromaticity is too high, and the difficulty of subsequent advanced treatment and recycling is increased. The problem that how to obtain good treatment effect to meet the subsequent treatment requirement under the condition of low cost investment is also an urgent need to be solved.

Semicoke (semi coke) has the same property with active carbon, but its specific surface area is slightly less than active carbon, utilize the semicoke that coal pyrolysis chemical industry (including coking plant) produced, can have the similar pore structure of active carbon after the modification, can replace active carbon in some aspects, the coking enterprise can produce oneself concurrently, further reduce the cost of enterprise, it makes the waste water pass through degree of depth adsorption treatment to replace active carbon with the semicoke, alleviate the degree of difficulty of follow-up waste water treatment, satisfy the requirement to the quality of water of intaking in the advanced treatment technology, realize the classification to coking waste water.

The wastewater after the adsorption treatment of the semicoke meets the requirement of the subsequent treatment process, but the adding mode of the semicoke also has certain difficulty, and the following defects and disadvantages exist in the physical or chemical method:

1. the coal pyrolysis or the powder generated in the pyrolysis-gasification process of the coal tar prepared by taking the coal as the raw material is finally combusted and released in a boiler, and the characteristics of low additional value and incapability of utilizing strong adsorption of semicoke are utilized, so that the resource waste and the environmental pollution are caused; the particle size of the semicoke is extremely small, secondary pollution of dust can be caused if dust prevention measures are not taken after the semicoke is directly added, and the density of the coke powder is less than that of water, so that the coking wastewater is difficult to mix.

2. The yield of the wastewater generated in the coal pyrolysis or pyrolysis-gasification process for preparing the coal tar by taking the coal as the raw material is larger, the treatment cost is very high at present, and particularly, the phenol ammonia in the wastewater is difficult to treat and has high treatment cost.

3. The existing wastewater adsorption technology has the advantages of long treatment time, low efficiency and high cost.

Disclosure of Invention

The invention aims to provide a coking wastewater purification treatment device which is simple in structure, can rapidly and efficiently treat wastewater and is low in operation cost, and also provides a method for purifying the coking wastewater by using the device.

The invention relates to a coking wastewater purification treatment device, which adopts the technical scheme that: comprises a primary mixing system, a circulating purification system and a filter-pressing deslagging system;

the primary mixing system comprises an adsorbent collecting bin with an adsorbent continuous metering instrument and a wastewater adsorbent premixer communicated with the adsorbent collecting bin, wherein the upper end of the wastewater adsorbent premixer is provided with an adsorbent feeding port, a stirring unit and a PH reagent feeding port;

the circulating purification system comprises a wastewater circulating purification lifting pipe which is connected into a whole from bottom to top and consists of a forced mixing area, a suspension adsorption area and a purification layering area, wherein the bottom of the forced mixing area is provided with a main material inlet communicated with a mixed liquid circulating pump, an outlet of the purification layering area is communicated with a solid-liquid separator, a liquid outlet of the solid-liquid separator is communicated with a purified water inlet of a purified wastewater buffer tank through a purified wastewater outlet after being filtered by a waste residue filtering unit, a purified water filter screen is arranged at the upper end of the purified water inlet in the purified wastewater buffer tank, a purified water outlet is arranged on the purified wastewater buffer tank at the upper end of the purified water filter screen, the bottom of the purified wastewater buffer tank is provided with a waste liquid outlet communicated with a liquid return inlet of the wastewater adsorbent premixer, a solid outlet of the solid-liquid separator is communicated with the solid-liquid settling tube, and an outlet of the solid-liquid settling tube is communicated with an inlet of the filter-pressing deslagging system.

The upper end in storehouse is collected to the adsorbent is equipped with the dust removal unit that prevents that the dust from causing secondary pollution and realizes that the protection of adsorbent nitrogen gas avoids the protection unit of spontaneous combustion, and the storehouse lower extreme is collected to the adsorbent is equipped with the not hard up unit that prevents the adsorbent bridging, and the bottom in storehouse is collected to the adsorbent is equipped with powder rotary feeder.

And a loosening liquid port and a reinforced fluidization port which are communicated with a mixed liquid circulating pump are arranged on the pipe wall of the forced mixing area of the wastewater circulating purification lifting pipe from top to bottom.

The filter-pressing deslagging system comprises a waste residue settling tank and a waste residue separator which are connected with the outlet of the solid-liquid settling pipe, wherein the waste residue settling tank is provided with a short section which is communicated with the forced mixing area of the wastewater circulating purification lifting pipe and is provided with one or more forced fluidization ports.

The lower end of the waste residue separator is also connected with a filter-pressing residue extractor, one end of the filter-pressing residue extractor is provided with a filter-pressing water outlet communicated with the purified water inlet of the purified waste water buffer tank, and the other end of the filter-pressing residue extractor is provided with a waste residue outlet.

And a waste residue filtering unit at the upper end of the solid-liquid separator is provided with a washing wastewater unit communicated with the purified water outlet.

The purified water outlet is also communicated with a flushing unit, and the side walls of the suspension adsorption zone and the solid-liquid settling tube are respectively provided with a flushing port communicated with the flushing unit.

The working pressure of the wastewater circulating purification lifting pipe, the solid-liquid separator and the solid-liquid settling pipe is 0.01-0.30 MPa.

The adsorbent collected by the adsorbent collecting bin is a modified carbon material taking peat, lignite, long flame coal, coal pyrolysis semi-coke products or coal gasification carbon-containing ash residues as raw materials, and the bulk density of the modified carbon material is 1.0-1.1 g/cm³Specific surface area of more than 200cm²/g。

The invention also comprises a method for purifying the coking wastewater by using the device, which comprises the following steps:

step 1: the adsorbent is metered by an adsorbent continuous metering instrument and then enters a powder rotary feeder under the action of gravity;

step 2: the coking wastewater enters a wastewater adsorbent premixer after being metered by a wastewater flow quantifier, a PH reagent is added from a PH reagent adding port, a distributed PH measuring unit measures the PH value of the wastewater, when the PH value of the wastewater is adjusted to 2-4, a powder rotary feeder is started to convey the metered adsorbent into the wastewater adsorbent premixer, a stirring unit stirs the wastewater and the adsorbent to be fully mixed in the premixer, and the mixed wastewater and the adsorbent are conveyed into a wastewater circulating purification lifting pipe through a mixed liquid circulating pump;

and step 3: the mixed wastewater and the adsorbent are forcibly mixed in a forced mixing area in a circulating purification system, the wastewater and the adsorbent enter a suspension adsorption area after being forcibly mixed to be further adsorbed, finally the wastewater enters a solid-liquid separator after being purified and layered in a purification layering area, the wastewater is preliminarily separated from the adsorbent after passing through the solid-liquid separator, the separated wastewater enters a purified wastewater buffer tank after being filtered by a waste residue filtering unit), the purified wastewater after being filtered enters a subsequent biochemical wastewater treatment through a purified water outlet after being filtered by a purified water filter screen, and the filtered waste liquid returns to a wastewater adsorbent premixer again through a liquid return inlet for retreatment;

and 4, step 4: the adsorbent separated by the solid-liquid separator enters a solid-liquid settling tube and enters a waste residue settling tank through settling, and the adsorbent which is not inactivated enters a wastewater circulating purification lifting pipe through a short section of the waste residue settling tank for recycling; and finally, extruding and forming the inactivated adsorbent by a filter pressing slag extractor, and outputting the extruded and formed inactivated adsorbent through a slag discharging outlet, wherein the waste water generated in the extrusion and forming of the inactivated adsorbent is discharged from a filter pressing water discharging outlet and then enters a purified waste water buffer tank for retreatment.

Compared with the prior art, the invention has the beneficial effects that:

the wastewater flow rate meter measures the entering wastewater, and when the PH value of the wastewater is adjusted to 2-4, the adsorbent measured by the adsorbent continuous meter is added into the wastewater adsorbent premixer, and the adsorption capacity of the adsorbent reaches the maximum at the moment; the waste water and the adsorbent in the waste water circulation purification lifting pipe are sequentially mixed, suspended and adsorbed and purified in a layered mode, the adsorbent and the coking waste water are fully mixed in the waste water circulation purification lifting pipe, the organic matters which are difficult to degrade in the coking waste water are fully adsorbed and treated by utilizing the extremely strong adsorbability of the adsorbent, and ammonia nitrogen in the coking waste water can be effectively removed. The waste water filters the back and gets into purification waste water buffer tank, after purifying the filter screen and filtering, the purification waste water after the filtration, the accessible purified water export gets into the processing of follow-up biochemical waste water, and the waste liquid after the filtration returns waste water adsorbent premixer and retreats again, and this circulation purification process is simple high-efficient, but the manifold cycles, can accomplish the high efficiency processing and the high multiplying power circulation to waste water, has solved the problem that waste water pretreatment cost is on the high side.

Furthermore, the adsorbent collecting bin receives semicoke powder generated by coal pyrolysis, the dust removal unit can effectively avoid secondary pollution caused by dust, the protection unit realizes the protection of adsorbent nitrogen to avoid spontaneous combustion, and the loosening unit ensures that the adsorbent is fluidized to prevent bridging.

Furthermore, the mixed liquid circulating pump divides the mixed liquid of the wastewater and the adsorbent into three paths and sends the three paths of the mixed liquid into a forced mixing area of the wastewater circulating purification lifting pipe, and the forced mixing of the wastewater and the adsorbent can be efficiently and quickly completed in the wastewater circulating purification lifting pipe.

Further, the waste residue enters a waste residue settling tank through settling, the adsorbent which is not inactivated can enter a forced mixing area of a wastewater circulating purification lifting pipe through a short section arranged on the side wall of the waste residue settling tank for recycling, and meanwhile, the inactivated adsorbent enters a waste residue separator.

And further, the filter-pressing slag extractor extrudes and removes the adsorbed deactivated adsorbent waste residues, and the discharged wastewater enters a purified wastewater buffer tank for retreatment.

Furthermore, the wastewater enters a subsequent biochemical wastewater treatment process through a purified water outlet, and the biochemical wastewater is also a source of the flushing wastewater and the flushing unit.

Furthermore, the modified carbon material has a pore structure similar to that of activated carbon, and can replace the activated carbon in some aspects, so that a coking enterprise can be produced and used by itself, and the enterprise cost is further reduced.

Furthermore, the coking wastewater purification treatment method realizes pretreatment of coking wastewater by using a circulating fluidization technology, and ammonia nitrogen in the coking wastewater is adsorbed by using extremely strong adsorbability of an adsorbent, so that the technical problems that the ammonia nitrogen and tar content in the wastewater are high and the subsequent wastewater recycling is influenced are solved.

Drawings

FIG. 1 is a schematic process flow diagram of the invention;

in the figure: 1. an adsorbent collection bin; 2. a wastewater adsorbent premixer; 3. a mixed liquid circulating pump; 4. circulating purification lift pipes; 5. a solid-liquid separator; 6. a solid-liquid settling tube; 7. a waste residue settling tank; 8. a waste residue separator; 9. a filter pressing slag extractor; 10. a slag discharge outlet; 11. a continuous sorbent meter; 12. a dust removal unit; 13. a powder rotary feeder; 14. a protection unit; 15. a loosening unit; 16. an adsorbent feed port; 17. a stirring unit; 18. a wastewater inlet; 19. a wastewater flow meter; 20. a waste residue filtering unit; 21. a purified wastewater outlet; 22. a wastewater flushing unit; 23. a flushing unit; 24. a PH reagent addition port; 25. a short section; 26. a distributed PH value measuring unit; 27. a purified wastewater buffer tank; 28. a purified water outlet; 29. a purified water inlet; 30. a liquid return inlet; 31. filter pressing the water outlet; 32. a waste liquid outlet; 33. a purified water filter screen; 34. loosening the liquid port; 35. strengthening the fluidization port; 36. a main material inlet; 37. a forced mixing zone; 38. a suspension adsorption zone; 39. purifying the stratified region.

Detailed Description

The following describes a specific embodiment of the present invention.

As shown in FIG. 1, the treatment device of the invention comprises a primary mixing system, a circulating purification system and a filter-pressing deslagging system;

the primary mixing system comprises an adsorbent collecting bin 1, a wastewater adsorbent premixer 2 and a mixed liquid circulating pump 3, the adsorbent collected by the adsorbent collecting bin 1 is a modified carbon material taking peat, lignite, long flame coal, coal pyrolysis semi-coke products or coal gasification carbon-containing ash slag as a raw material, the modified carbon material has a pore structure similar to that of activated carbon, the modified carbon material can replace the activated carbon in certain aspects, a coking enterprise can combine self-production and self-use, the enterprise cost is further reduced, and the bulk density after modification is 1.0-1.1 g/cm³Specific surface area of more than 200cm²The upper end of the adsorbent collecting bin 1 is provided with a dust removal unit 12 which can effectively avoid secondary pollution caused by dust and a nitrogen protection unit 14 which can avoid spontaneous combustion of the adsorbent, and the adsorbent collecting bin 1The lower end is provided with a loosening unit 15 for ensuring the fluidization of the adsorbent to prevent the bridging of the adsorbent, the bottom of the adsorbent collecting bin 1 is provided with a powder rotary feeder 13, the outlet of the adsorbent collecting bin 1 is provided with an adsorbent continuous metering instrument 11 for ensuring the quantitative addition of the adsorbent into the wastewater adsorbent premixer 2, the upper end of the wastewater adsorbent premixer 2 is provided with an adsorbent feeding port 16, a stirring unit 17 and a PH reagent feeding port 24 which are communicated with the powder rotary feeder 13, the PH reagent is added from the PH reagent feeding port 24 to adjust the PH value of the wastewater, the wastewater adsorbent premixer 2 is also provided with a distributed PH measuring unit 26, the side surface of the wastewater adsorbent premixer 2 is provided with a wastewater inlet 18, a wastewater flow rate meter 19 is arranged on a connecting pipeline of a wastewater inlet 18, and a mixed liquid outlet at the bottom of the wastewater adsorbent premixer 2 is connected with an inlet of a mixed liquid circulating pump 3;

the circulating purification system comprises a wastewater circulating purification lifting pipe 4 with the working pressure of 0.01-0.30 MPa, a solid-liquid separator 5 and a solid-liquid settling pipe 6, wherein the wastewater circulating purification lifting pipe 4 comprises a forced mixing area 37, a suspension adsorption area 38 and a purification layering area 39 which are connected into a whole from bottom to top, in order to efficiently and quickly complete the forced mixing of wastewater and an adsorbent in the wastewater circulating purification lifting pipe 4, a main material inlet 36, a loose liquid port 34 and a reinforced fluidization port 35 which are communicated with a mixed liquid circulating pump 3 are arranged at the bottom of the forced mixing area 37 and on the pipe wall from top to bottom, meanwhile, mixed liquid which does not enter the wastewater circulating purification lifting pipe 4 in the mixed liquid circulating pump 3 returns to the wastewater adsorbent premixer 2 through a liquid return inlet 30, the outlet of the purification layering area 39 is communicated with the solid-liquid separator 5, the liquid outlet of the solid-liquid separator 5 is communicated with a purified water inlet 29 of a purified wastewater buffer tank 27 through a purified wastewater outlet 21 after being, a purified water filter screen 33 is arranged at the upper end of a purified water inlet 29 in a purified wastewater buffer tank 27, a purified water outlet 28 is arranged on the purified wastewater buffer tank 27 at the upper end of the purified water filter screen 33, a waste liquid outlet 32 communicated with a liquid return inlet 30 of the wastewater adsorbent premixer 2 is arranged at the bottom of the purified wastewater buffer tank 27, a flushing wastewater unit 22 communicated with the purified water outlet 28 is arranged on a waste residue filtering unit 20 at the upper end of the solid-liquid separator 5, a solid outlet of the solid-liquid separator 5 is communicated with the solid-liquid settling tube 6, the purified water outlet 28 is also communicated with the flushing unit 23, flushing ports communicated with the flushing unit 23 are respectively arranged on the side walls of the suspension adsorption zone 38 and the solid-liquid settling tube 6, and an outlet of the settling tube 6 is communicated with an inlet of a filter-;

the filter-pressing slag discharging system comprises a waste residue settling tank 7, a waste residue separator 8 and a filter-pressing slag discharging device 9 which are sequentially communicated, wherein an inlet of the waste residue settling tank 7 is connected with an outlet of a solid-liquid settling pipe 6, a short section 25 which is communicated with a forced mixing area 37 of a wastewater circulating purification lifting pipe 4 and is provided with one or more forced fluidization ports is arranged on the waste residue settling tank 7, an inactivated adsorbent can enter the forced mixing area 37 of the wastewater circulating purification lifting pipe 4 through the short section arranged on the side wall of the waste residue settling tank 7 for recycling, the inactivated adsorbent enters the waste residue separator 8 at the same time, the lower end of the waste residue separator 8 is connected with the filter-pressing slag discharging device 9, one end of the filter-pressing slag discharging device 9 is provided with a filter-pressing water discharging port 31 communicated with a purified water inlet 29 of a. The filter-pressing slag extractor discharges the adsorbed adsorbent out of the system, completes the extrusion forming of the adsorbent coke slag, is convenient for transportation out of the country, the filter-pressing water outlet 31 is communicated with the purified water inlet 29 of the purified wastewater buffer tank 27, and the waste liquid outlet of the purified wastewater buffer tank returns to the wastewater adsorbent premixer again for retreatment.

The invention discloses a method for purifying coking wastewater, which comprises the following steps:

step 1: the adsorbent is metered by an adsorbent continuous metering instrument 11 and then enters a powder rotary feeder 13 under the action of gravity;

step 2: coking wastewater enters a wastewater adsorbent premixer 2 after being metered by a wastewater flow rate quantifier 19, a PH reagent is added from a PH reagent adding port 24, a distributed PH measuring unit 26 measures the PH value of the wastewater, when the PH value of the wastewater is adjusted to 2-4, a powder rotary feeder 13 is started to convey the metered adsorbent into the wastewater adsorbent premixer 2, a stirring unit 17 stirs the wastewater and the adsorbent to be fully mixed in the premixer 2, and the mixed wastewater and the adsorbent are conveyed into a wastewater circulating purification lifting pipe 4 through a mixed liquid circulating pump 3;

and step 3: the mixed wastewater and the adsorbent are forcibly mixed in a forced mixing area 37 in the circulating purification system 4, the wastewater and the adsorbent are forcibly mixed, the wastewater and the adsorbent enter a suspension adsorption area 38 after being forcibly mixed to be further adsorbed, the wastewater and the adsorbent are primarily separated after the wastewater and the adsorbent enter a solid-liquid separator 5 after being purified and layered in a purification layering area 39, the separated wastewater enters a purified wastewater buffer tank 27 after being filtered by a waste residue filtering unit 20, the purified wastewater enters a subsequent biochemical wastewater treatment through a purified water outlet 28 after being filtered by a purified water filter screen 33, and the filtered waste liquid returns to the wastewater adsorbent premixer 2 through a liquid return inlet 30 for retreatment;

and 4, step 4: the adsorbent separated by the solid-liquid separator 5 enters a solid-liquid settling tube 6 and enters a waste residue settling tank 7 through settling, and the adsorbent which is not inactivated enters a wastewater circulating purification lifting pipe 4 through a short joint 25 of the waste residue settling tank 7 for recycling; the inactivated adsorbent is finally extruded by a filter-pressing slag extractor 9 and then output through a slag extraction outlet 10, and the waste water generated in the extrusion molding of the inactivated adsorbent is discharged from a filter-pressing water discharge port 31 and then enters a purified waste water buffer tank 27 for retreatment.