阅读说明：本技术 生物焦制备及使用方法和装置 (Biological coke preparation and use method and device ) 是由 王营利 于 2019-08-20 设计创作，主要内容包括：本发明属于生物焦处理污水领域,具体涉及一种生物焦制备及使用方法和装置,制备方法包括1)水分干燥阶段：将原料在150℃以下进行水分干燥；2)热解干燥阶段：将步骤1)得到的干燥产物在150-300℃条件下进行热解干燥；3)碳化干燥阶段：将步骤2)得到的干燥产物在300-600℃条件下进行碳化干燥,得到所需生物焦。本发明的生物焦连续吸附再生方法可以利用生物焦吸附污水中难降解COD,之后对生物焦进行再生,生物焦可连续吸附/再生12次左右,实验表明再生焦的主要技术指标及COD实际吸附效果与原生物焦基本相当。(the invention belongs to the field of biological coke treatment sewage, and particularly relates to a method and a device for preparing and using biological coke, wherein the preparation method comprises the following steps of 1) a moisture drying stage: drying the raw materials at the temperature below 150 ℃ with water; 2) a pyrolysis drying stage: carrying out pyrolysis drying on the dried product obtained in the step 1) at the temperature of 150-300 ℃; 3) and (3) carbonization and drying stage: carbonizing and drying the dried product obtained in the step 2) at the temperature of 300-600 ℃ to obtain the required biological coke. The method for continuously adsorbing and regenerating the biological coke can utilize the biological coke to adsorb the nondegradable COD in the sewage, and then regenerate the biological coke, wherein the biological coke can be continuously adsorbed/regenerated for about 12 times, and experiments show that the main technical indexes and the actual COD adsorption effect of the regenerated coke are basically equivalent to those of the original biological coke.)

1. The preparation method of the biological coke is characterized by comprising the following steps:

1) and (3) a moisture drying stage: drying the activated carbon raw material at the temperature of below 150 ℃ by moisture;

2) A pyrolysis drying stage: carrying out pyrolysis drying on the dried product obtained in the step 1) at the temperature of 150-300 ℃;

3) And (3) carbonization and drying stage: carbonizing and drying the dried product obtained in the step 2) at the temperature of 300-600 ℃ to obtain the required biological coke.

2. the method for preparing biological coke according to claim 1, wherein the particle size of the biological coke is 3-5 mm; the pore volume is 0.4-0.5mg/g, the specific surface area is 650m²per g, iodine value of 800-900mg/g, methylene blue of 120-130mg/g, bulk density of 0.4-0.45 ton/m³。

3. A method of using the biocoke obtained by the process of claim 1, wherein the biocoke is used in combination with mixed strains; the mixed strain comprises the following components: bacillus cereus S641X 10%, zoogloea bougainsteri Y11-0725%, ammoniated hypoxic bacteria PTC 120%, nitrobacteria BX 525%, low temperature resistant denitrifying bacteria HR 30210%, and denitrifying bacteria LDP 0510%.

4. The method for regenerating the biological coke obtained by the preparation method according to claim 1, wherein the biological coke having a water content of less than 20% and adsorbed with the sewage is subjected to regeneration activation, and the regeneration activation comprises three steps of drying, drying at 0-400 ℃, drying at 400-600 ℃ and drying at 600-720 ℃.

5. The device for using the biological coke is characterized by comprising an adsorption unit, an activation and regeneration unit and a circulation unit;

the adsorption unit comprises a plurality of adsorption tower units which are mutually connected in series or in parallel; the adsorption tower unit comprises a support and an adsorption tower arranged on the support; the adsorption tower comprises an upper coke port arranged at the top of the tower, a water outlet arranged at the side end of the top of the side tower, a coke discharge port arranged at the bottom of the tower, a water inlet arranged at one side end of the bottom of the tower and a water outlet arranged at the other side end of the bottom of the tower;

The activation regeneration unit comprises a hot air drying furnace and a regeneration unit which are communicated with each other; the regeneration unit comprises a base and a regeneration furnace arranged on the base; the regeneration furnace comprises a furnace body, a power unit for driving the furnace body, a feed inlet arranged at one side of the furnace body and a discharge outlet arranged at the other side of the furnace body; the bottom of the base is provided with a support frame;

the circulating unit comprises a water circulating unit and a regenerated coke circulating unit; the water circulation unit comprises a water storage tank; the inlet of the water storage tank is communicated with the water outlet of the absorption tower, and the outlet of the water storage tank is communicated with the inlet of the water-coke mixing storage tank;

The regenerated coke circulating unit comprises a regeneration activation tank; the coke inlet and the coke outlet of the regeneration activation tank are respectively communicated with the discharge hole of the regeneration furnace and the water-coke mixed storage tank; and a coke discharging port of the adsorption tower is communicated with a feeding port of the hot air drying furnace.

6. A method of using the apparatus of claim 5, comprising the steps of:

1) Adsorption: adding a water-coke mixture formed by biological coke and purified water into an adsorption tower, discharging the purified water through a water outlet, adjusting the filling amount of the biological coke in the adsorption tower to be 70-80%, and adding mixed strains for biological activation;

2) Purifying sewage, namely closing a water outlet, an upper coke port and a coke discharging port, and then purifying the sewage, wherein the sewage enters from a water inlet and flows out from a water outlet after being adsorbed by biological coke;

3) After multiple times of adsorption, the biological coke at the bottom of the adsorption tower is saturated, and a coke discharging port is opened for coke discharging, wherein the coke discharging is 0.5-1m each time.

4) the discharged waste coke is subjected to moisture reduction to be below 20% by a hot air drying furnace and then enters a regeneration furnace for regeneration, and the temperature mode of the regeneration furnace is PID intelligent instrument, electric actuator automatic temperature control and seven-zone temperature control;

5) And mixing the regenerated biological coke with water in a water storage tank, and recycling the water-coke mixture.

Technical Field

The invention belongs to the field of biological coke treatment sewage, and particularly relates to a method and a device for preparing and using biological coke.

background

With the rapid development of economy in China, a large number of industries are vigorous and have increasingly serious environmental pollution, the environment protection problem is highly emphasized by the nation, and the updated higher environmental protection emission standard is developed in various places.

The traditional biochemical treatment method can not meet the new requirement of environmental protection, and particularly, after the tail water of sewage treatment plants in industrial parks and urban sewage plants containing industrial wastewater is biochemically treated, the residual pollution factors in the water are mainly organic compounds such as heterocyclic compounds, multi-bond compounds, multi-carbon compounds and the like which are difficult to degrade. The chemical and biological stability of the pollutants is high, and the new processes such as an ozone oxidation method, a fenton oxidation method, an activated carbon adsorption method and the like are frequently used at present, have good effect in an experimental stage and can cause more or less problems in practical engineering application.

disclosure of Invention

the invention aims to provide a biological coke continuous adsorption regeneration device.

in order to achieve the purpose, the invention adopts the following technical scheme:

A method for preparing biological coke comprises the following steps:

1) and (3) a moisture drying stage: drying the activated carbon raw material at the temperature of below 150 ℃ by moisture;

2) a pyrolysis drying stage: carrying out pyrolysis drying on the dried product obtained in the step 1) at the temperature of 150-300 ℃;

3) And (3) carbonization and drying stage: carbonizing and drying the dried product obtained in the step 2) at the temperature of 300-600 ℃ to obtain the required biological coke.

The particle size of the biological coke is 3-5 mm; the pore volume is 0.4-0.5mg/g, the specific surface area is 650m²Per g, iodine value of 800-900mg/g, methylene blue of 120-130mg/g, bulk density of 0.4-0.45 ton/m³。

The application method of the biological coke obtained by the preparation method comprises the steps of combining the biological coke with mixed strains for use; the mixed strain comprises the following components: bacillus cereus S641X 10%, zoogloea bougainsteri Y11-0725%, ammoniated hypoxic bacteria PTC 120%, nitrobacteria BX 525%, low temperature resistant denitrifying bacteria HR 30210%, and denitrifying bacteria LDP 0510%.

A process for regenerating biological coke includes such steps as adsorbing sewage, activating, heating by different temp zones until the temp is 600-720 deg.C, and regenerating.

A device for using biological coke comprises an adsorption unit, an activation and regeneration unit and a circulation unit;

The adsorption unit comprises a plurality of adsorption tower units which are mutually connected in series or in parallel; the adsorption tower unit comprises a support and an adsorption tower arranged on the support; the adsorption tower comprises an upper coke port arranged at the top of the tower, a water outlet arranged at the side end of the top of the side tower, a coke discharge port arranged at the bottom of the tower, a water inlet arranged at one side end of the bottom of the tower and a water outlet arranged at the other side end of the bottom of the tower;

The activation regeneration unit comprises a hot air drying furnace and a regeneration unit which are communicated with each other; the regeneration unit comprises a base and a regeneration furnace arranged on the base; the regeneration furnace comprises a furnace body, a power unit for driving the furnace body, a feed inlet arranged at one side of the furnace body and a discharge outlet arranged at the other side of the furnace body; the bottom of the base is provided with a support frame;

The circulating unit comprises a water circulating unit and a regenerated coke circulating unit; the water circulation unit comprises a water storage tank; the inlet of the water storage tank is communicated with the water outlet of the absorption tower, and the outlet of the water storage tank is communicated with the inlet of the water-coke mixing storage tank;

the regenerated coke circulating unit comprises a regeneration activation tank; the coke inlet and the coke outlet of the regeneration activation tank are respectively communicated with the discharge hole of the regeneration furnace and the water-coke mixed storage tank; and a coke discharging port of the adsorption tower is communicated with a feeding port of the hot air drying furnace.

A method of using the device, comprising the steps of:

1) Adsorption: adding a water-coke mixture formed by biological coke and purified water into an adsorption tower, discharging the purified water through a water outlet, adjusting the filling amount of the biological coke in the adsorption tower to be 70-80%, and adding mixed strains for biological activation;

2) purifying sewage, namely closing a water outlet, an upper coke port and a coke discharging port, and then purifying the sewage, wherein the sewage enters from a water inlet and flows out from a water outlet after being adsorbed by biological coke;

3) After multiple times of adsorption, the biological coke at the bottom of the adsorption tower is saturated, and a coke discharging port is opened for coke discharging, wherein the coke discharging is 0.5-1m each time.

4) the discharged waste coke is subjected to moisture reduction to be below 20% by a hot air drying furnace, and then enters a regenerating furnace for regeneration, and the regenerating furnace is subjected to step-by-step temperature control drying;

5) And mixing the regenerated biological coke with water in a water storage tank, and recycling the water-coke mixture.

The support frame is a hydraulic support frame; the hydraulic support frame can adjust the inclination of the regeneration furnace; the inclination is 0-3 degrees.

The furnace body adopts electric heating.

Compared with the prior art, the invention has the beneficial effects that: in the preparation process of the biological coke, firstly, the dry distillation process of the material under the low temperature condition is utilized, in the process, the material is gradually heated up and heated within a certain low temperature range and under the condition of air isolation, low molecular substances in the material are firstly volatilized, the external moisture and the internal moisture of the raw material are evaporated by means of the heat supplied from the outside at the temperature of below 150 ℃, and the shape of the raw material is unchanged at the moment. Then degassing and drying are carried out, at 150-300 ℃, the raw materials begin to generate decomposition reaction to release gaseous products (such as CO, CO2, H2S and the like), the chemical composition of the raw materials begins to change, different materials begin to change, and the starting pyrolysis temperature of different materials is lower. And finally, in the carbonization process, at 300-600 ℃, condensation polymerization and thermal decomposition reactions are mainly used, a large amount of volatile matters are separated out from the raw materials, and almost all products such as tar, methanol, ethylene and the like separated out in the carbonization process are generated at the stage. At this stage, the materials are gradually softened and melted to form a colloid with coexisting gas, liquid and solid phases, and then the colloid is converted into semicoke, needle-shaped semicoke or block-shaped semicoke through the processes of flowing, polycondensation, solidification and the like. As the materials can discharge non-carbon substances such as oxygen, hydrogen and the like during pyrolysis, and the carbon atoms after losing hydrogen and oxygen are rearranged to form an ordered matter with a basic graphite microcrystal structure, the crystal consists of hexagonally arranged carbon atom planes which are irregularly arranged, so that gaps among microcrystals are formed, and the gaps are initial gaps of the carbonized materials. The purpose of carbonization is therefore to form a secondary pore structure of the material that is easily activated and to impart the mechanical strength necessary to withstand activation. The requirements for the carbonization of the material are obtained by heating and carbonizing.

During the debugging period of the biological coke, the special-effect strains added are cultured, thereby ensuring the NH₃Good removal of-N and TN, NH₃the removal rate of-N is 30-80%, and the removal rate of TN is 10-40%.

After the treatment by the process, the CODcr can reach the standards of surface class IV water and class III water, the CODcr can be reduced to 20-30mg/L, and the treatment efficiency is as high as 85%.

The biological coke continuous adsorption regeneration device can be suitable for various treatment scales, and can be designed in a modular combination mode, such as series connection or parallel connection of multiple groups. Sewage enters and exits from the top, the adsorption process is long, the technical design of a peristaltic bed is adopted, the biological coke has sufficient saturated adsorption time, the impact resistance is strong, and the effluent is stable; the regeneration unit firstly utilizes the hot air drying furnace to dry the biological coke discharged from the absorption tower until the tax content is about 20 percent, and then the biological coke enters the regeneration unit for regeneration, the regeneration unit utilizes the regeneration furnace to heat and regenerate the biological coke, the pores in the biological coke are reopened, the adsorption rate of the regenerated coke is improved, the regeneration time is reduced, the regenerated biological coke is added into the adsorption tower again for adsorption, and the usage amount can reach the normal usage amount

the process does not add any chemical agent (acid, alkali, ferrous sulfate and other chemical agents), does not increase the salt content in the water, creates favorable conditions for the subsequent reuse of reclaimed water, and does not generate sludge in the treatment process;

compared with the ozone catalytic oxidation method and the Fenton method, the process has low investment cost and low operation cost;

This technique relies on the biological burnt product of high quality, low price, concentrates the pollutant through adsorbing, and the regeneration is actually to the centralized processing of concentrate, realizes carrying out thorough elimination to the pollutant, and makes whole treatment cost reduce.

Drawings

FIG. 1 is a schematic view showing the overall construction of a biological coke regenerating apparatus according to the present invention;

FIG. 2 is a schematic view of the structure of an adsorption column of the present invention;

FIG. 3 is a schematic diagram of the structure of an activation regeneration unit according to the present invention.

Detailed Description

in order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments.

FIGS. 1 to 3 show a biological coke continuous adsorption regeneration device, which comprises an adsorption unit, an activation regeneration unit and a circulation unit;

The adsorption unit comprises a plurality of adsorption tower units which are mutually connected in series or in parallel; the adsorption tower unit comprises a support and an adsorption tower 3 arranged on the support; the adsorption tower comprises an upper coke port 31 arranged at the tower top, a water outlet 32 arranged at the side end of the side tower top, a coke discharge port 34 arranged at the tower bottom, a water inlet 35 arranged at one side end of the tower bottom and a water discharge port 33 arranged at the other side end of the tower bottom;

The activation regeneration unit comprises a hot air drying furnace 1 and a regeneration unit 2 which are communicated with each other; the regeneration unit comprises a base 21 and a regeneration furnace arranged on the base; the regeneration furnace comprises a furnace body 22, a power unit 23 for driving the furnace body, a feed inlet 24 arranged at one side of the furnace body and a discharge outlet 25 arranged at the other side of the furnace body; the bottom of the base is provided with a supporting frame 26; the support frame is a hydraulic support frame; the hydraulic support frame can adjust the inclination of the regeneration furnace; the inclination is 0-3 degrees. The furnace body adopts electric heating. The surface of the furnace body is provided with a temperature sensor, the temperature sensor is connected with a controller, and the controller controls the temperature of the furnace body to regenerate the biological coke.

the circulating unit comprises a water circulating unit and a regenerated coke circulating unit; the water circulation unit comprises a water storage tank 13; the inlet of the water storage tank is communicated with the water outlet of the absorption tower, and the outlet of the water storage tank is communicated with the water coke mixing storage tank; when the device is used, the purified water discharged by the adsorption tower in the process of feeding the coke can be stored in the water storage tank and used for diluting the biological coke to obtain a water-coke mixture, so that the purified water can be recycled, and meanwhile, when the concentration of the biological coke is adjusted by the water-coke mixing tank, the purified water can be discharged into the water storage tank, so that the recycling is realized;

the regenerated coke circulating unit comprises a regeneration activation tank 6; the regeneration activation tank is communicated with a discharge hole of the activation regeneration unit and the water coke mixing storage tank 4; and a coke discharging port 34 of the adsorption tower is communicated with a feeding port of the hot air drying furnace. The regeneration activation tank is provided with a cold water inlet and a cold water outlet; and the cold water inlet and the cold water outlet are respectively communicated with the water storage tank, and the biological coke is activated by using circulating water.

The preparation method of the biological coke comprises the following steps:

1) and (3) a moisture drying stage: drying the activated carbon raw material at the temperature of below 150 ℃ by moisture;

2) a pyrolysis drying stage: carrying out pyrolysis drying on the dried product obtained in the step 1) at the temperature of 150-300 ℃;

3) And (3) carbonization and drying stage: carbonizing and drying the dried product obtained in the step 2) at the temperature of 300-600 ℃ to obtain the required biological coke.

The particle size of the obtained biological coke is 3-5 mm; the pore volume is 0.4-0.5mg/g, the specific surface area is 650m²per g, iodine value of 800-900mg/g, methylene blue of 120-130mg/g, bulk density of 0.4-0.45 ton/m³。

the using process of the invention is as follows: during the adsorption process, when in use, the biological coke water mixture enters the adsorption tower from the upper coke port 31, the water outlet 33 at the bottom of the tower is opened at the moment, so that the water in the biological coke water mixture is emptied into the water storage tank 13 from the water outlet, the adsorption tower contains enough biological coke, and the mixed strains, namely the bacillus cereus S641X 10, the zoogloea ramicola Y11-0725, the low-oxygen ammoniation bacteria PTC 120, the nitrobacteria BX525, the low-temperature resistant denitrifying bacteria HR30210 and the denitrifying bacteria LDP 0510 are added. The mixed bacterial species can be propagated in the sewage, and thus the addition amount thereof may be determined as appropriate.

at this time, the water outlet 33 and the upper coke port 31 are closed, the water inlet 35 connected to the wastewater tank at the bottom of the tower is opened, the water outlet 32 at the top of the tower is opened, and the purified water adsorbed by the biocoke flows out from the water outlet 32. The biological coke after the adsorption is finished is discharged from the coke beating port, 0.5-1 meter is discharged each time, the regeneration of the mixed strains can be ensured, and the biological coke does not need to be continuously added in the adsorption process. Waste coke discharged from a coke discharge port 4 at the bottom of the tower is stored and enters a hot air drying furnace 1 for primary hot air drying, so that the moisture in the biological coke is less than or equal to 20 percent; the biological coke dried by hot air enters a regeneration unit, the furnace body is driven to rotate by a power unit and is heated, so that the biological coke is dried at 0-400 ℃, dried at 400-600 ℃ and dried at 600-720 ℃ for regeneration, the regenerated biological coke enters a room temperature water environment, water is evaporated into water vapor, and the water vapor is used for reaming and activating the biological coke. The water vapor can rapidly remove the residual carbide in the pores of the biological coke, and the pores in the biological coke can be reopened, thereby improving the adsorption rate of the regenerated coke and reducing the regeneration time.

water in the water storage tank is used for diluting activated biological coke in the biological coke storage tank to form a water-coke mixture, and then the water-coke mixture is stored in a water-coke mixture storage tank 4, and then a water pump 5 is lifted for pipeline feeding, so that the water-coke mixture enters the adsorption tower from an upper coke opening of the adsorption tower; meanwhile, water can be discharged through a liquid outlet arranged on the water-coke mixture storage tank, so that the concentration of the biological coke in the water-coke mixture storage tank can be adjusted; the drained water is returned to the liquid storage tank 13 for recycling.

The invention has simple operation and high automation degree: the method provides great feasibility, reliability and flexibility in the aspects of engineering design, matching, installation, debugging, maintenance and the like. According to the quantity and the quality of the wastewater, the number of the corresponding wastewater treatment adsorption towers and the treatment capacity of the regeneration device are flexibly configured, and the purification treatment efficiency is high. The biological coke adsorption tower is suitable for various treatment scales, can be subjected to modular combination design, realizes mechanical and automatic operation, and has the advantages of simple and convenient operation, long service life and small occupied area. Meanwhile, the recycling and cost are low: the biological coke can be regenerated for about 12 times, so that the repeated recycling is realized, the efficiency is high, and the operation cost is low; compared with the ozone catalytic oxidation method and the Fenton method, the process has low investment cost and low operation cost; this technique relies on the biological burnt product of high quality, low price, concentrates the pollutant through adsorbing, and the regeneration is actually to the centralized processing of concentrate, realizes carrying out thorough elimination to the pollutant, and makes whole treatment cost reduce.

the above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.