阅读说明：本技术 基于生物膜的两段式强化pdamox工艺同步处理硝酸盐废水和生活污水的装置和方法 (Device and method for synchronously treating nitrate wastewater and domestic sewage by two-stage reinforced PDAMOX process based on biological membrane ) 是由 彭永臻 张静雯 杜睿 李翔晨 李夕耀 于 2021-07-14 设计创作，主要内容包括：基于生物膜的两段式强化PDAMOX工艺同步处理硝酸盐废水和生活污水的装置和方法属于废水生物处理领域。城市生活污水和硝酸盐废水首先进入短程反硝化序批式生物膜反应器中,由生活污水提供有机碳源,缺氧搅拌使反硝化细菌将硝酸盐氮转化成亚硝酸盐氮；短程反硝化序批式生物膜反应器出水进入厌氧氨氧化上流式厌氧污泥床生物膜反应器中进行脱氮。同时厌氧氨氧化上流式厌氧污泥床生物膜反应器部分出水回流至原水箱将厌氧氨氧化反应生成的硝酸盐氮深度去除。本发明无需外加碳源,同时短程反硝化过程产生的OH～(-)给厌氧氨氧化过程提供碱度,并且回流解决了硝酸盐氮无法去除的问题；生物膜载体提高系统生物量和耐冲击负荷能力,以达到废水深度脱氮。(A device and a method for synchronously treating nitrate wastewater and domestic sewage by a two-section type reinforced PDAMOX process based on a biological membrane belong to the field of biological wastewater treatment. The method comprises the following steps that (1) urban domestic sewage and nitrate wastewater firstly enter a short-range denitrification sequencing batch biofilm reactor, the domestic sewage provides an organic carbon source, and denitrification bacteria convert nitrate nitrogen into nitrite nitrogen through anoxic stirring; and (3) the effluent of the short-cut denitrification sequencing batch biofilm reactor enters an anaerobic ammonia oxidation upflow anaerobic sludge blanket biofilm reactor for denitrification. At the same time of anaerobic ammonia oxidationPart of effluent of the flow anaerobic sludge bed biomembrane reactor flows back to the raw water tank to deeply remove nitrate nitrogen generated by anaerobic ammonia oxidation reaction. The invention does not need additional carbon source, and simultaneously generates OH in the short-cut denitrification process ‑ Alkalinity is provided for the anaerobic ammonia oxidation process, and the problem that nitrate nitrogen cannot be removed is solved through reflux; the biomembrane carrier improves the biomass and impact load resistance of the system so as to achieve deep denitrification of the wastewater.)

1. The device for synchronously treating nitrate wastewater and domestic sewage by a two-section type enhanced PDAMOX process based on a biomembrane is characterized by comprising a raw water tank (1), a short-cut denitrification sequence batch biomembrane reactor (2), an intermediate water tank (3), an anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor (4) and a sedimentation tank (5); the short-range denitrification sequencing batch biofilm reactor (2) comprises a membrane with the diameter of 20-50 mm and the density of 0.9-1.0 g/cm³The specific surface area is 200-800 m²/m³The device comprises a polyethylene hollow ring filler (2.3) with the porosity of 94-96% and the filling ratio of 15-25%, a stirrer (2.4), a first sampling port (2.5), a first water outlet (2.6), a drain valve (2.7), a vent pipe (2.8) and a first pH on-line tester (2.9); the anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor (4) comprises a second water inlet pump (4.1), a second water inlet (4.2), a second sampling port (4.3), a second water outlet (4.4), a backflow port (4.5), a first backflow pump (4.6), a third water inlet (4.7), a second emptying pipe (4.8), a three-phase separator (4.9), a second pH online tester (4.10) and a second backflow pump (4.11); raw water tank (1)) Is connected with a short-cut denitrification sequencing batch biofilm reactor (2) through a first water inlet pump (2.1); the intermediate water tank (3) is connected with a second water inlet (4.2) of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor (4) through a second water inlet pump (4.1); in addition, the first pH on-line measuring instrument (2.9) and the second pH on-line measuring instrument (4.10) are connected with the process controller (6); a process controller (6) is connected with a computer (7) and is used for controlling a first water inlet pump (2.1), a second water inlet pump (4.1), a first reflux pump (4.6), a second reflux pump (4.11), a stirrer (2.4), a drain valve (2.7), a first pH online tester (2.9) and a second pH online tester (4.10); the automatic control system comprises a process controller (6) and a computer (7).

2. The method for synchronously treating nitrate wastewater and domestic sewage by applying the device of claim 1, which is characterized by comprising the following processes:

(1) starting the short-cut denitrification sequencing batch biofilm reactor: inoculating a polyethylene hollow ring filler, controlling the filling ratio of the filler to be 20-40%, and controlling the sludge concentration of the inoculated filler to be 2000-4000 mg/L; the influent wastewater is nitrate nitrogen and domestic sewage, and the mixing ratio of the nitrate wastewater and the domestic sewage is controlled to ensure that COD/NO in the influent wastewater is₃ ^-The mass concentration of the nitrate is controlled to be 2-4, wherein the concentration of the nitrate is 50-200 mg/L, the operation is carried out for 6 cycles every day, each cycle is 4 hours, and the five stages of water inlet, stirring, precipitation, water drainage and idling are included, wherein the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the precipitation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and when the nitrite accumulation rate is higher than 80%, the short-range denitrification sequencing batch biofilm reactor is started successfully;

(2) starting an anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor: firstly, inoculating a suspended filler attached with anaerobic ammonia oxidation sludge into an up-flow anaerobic sludge bed biomembrane reactor, controlling the sludge concentration of the inoculated up-flow anaerobic sludge bed biomembrane reactor filler to be 2000-5000 mg/L, controlling the inlet water to be artificially prepared nitrite nitrogen concentration of 100mg/L and ammonia nitrogen concentration of 100mg/L simulated wastewater, controlling the hydraulic retention time to be 6-15 h, controlling the ratio of outlet water backflow to inlet water flow to be 100-200%, and controlling the sludge age to be 6-15 d; when the removal rate of ammonia nitrogen and nitrite nitrogen in the effluent is more than 80%, successfully starting the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor;

(3) and (3) combined operation:

the method comprises the following steps that mixed wastewater containing domestic sewage and nitrate wastewater in a raw water tank enters a short-cut denitrification sequencing batch biofilm reactor through a first water inlet pump, the operation is carried out for 6 cycles every day, the period is 4 hours every week, the mixed wastewater comprises five stages of water inlet, stirring, sedimentation, water drainage and idling, wherein the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the sedimentation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and effluent enters an intermediate water tank;

the wastewater in the intermediate water tank enters an anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor through a second water inlet pump, the hydraulic retention time is 6-15 h, and the pump speed of the first reflux pump is adjusted to control the ratio of the effluent reflux to the water inlet flow to be 100-200%; 50% of effluent of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor is pumped into a raw water tank by a second reflux pump;

in the process, the water inlet pump, the reflux pump and the drain valve are controlled by an automatic control system.

Technical Field

The invention relates to a device and a method for synchronously treating nitrate wastewater and domestic sewage by a two-section type reinforced PDAMOX process based on a biological membrane, belonging to the technical field of biological wastewater treatment.

Background

In actual life, industrial production often produces a large amount of wastewater containing nitrate nitrogen, and the physical and chemical treatment method of the wastewater usually needs to add a large amount of medicaments, has high operation cost and cannot remove nitrogen contained in the water; the biological treatment method adopting complete nitrification and denitrification also needs to add a large amount of carbon sources, the yield of the excess sludge is high, and the running cost of a sewage treatment plant is increased.

The anaerobic ammonia oxidation technology has the advantages of no need of aeration, no need of carbon source, small sludge yield and the like, belongs to the autotrophic nitrogen removal technology, and has attracted general attention in the industry in recent years. And the deep denitrification technology coupled with other technologies is gradually developed and matured. The anammox bacteria convert ammonia nitrogen and nitrite to nitrogen. One of the bottlenecks that limit its large-scale application is the stable access of the substrate nitrite.

The short-cut denitrification technology can convert nitrate nitrogen into nitrite, saves partial carbon source compared with complete denitrification, has less sludge yield and can provide substrate nitrite for anaerobic ammonia oxidation. Mixing industrial wastewater containing nitrate nitrogen with urban domestic sewage, wherein degradable organic matters in the urban domestic sewage provide a carbon source for short-cut denitrification, and simultaneously, the generated nitrite nitrogen and ammonia nitrogen in the domestic sewage can be synchronously removed by an anaerobic ammonia oxidation technology.

Because the reactor often causes the loss of biomass when yielding water in the operation process, the biomass can be effectively intercepted by adopting a mode of adding carrier filler, and the settling property of the reactor is improved, so that the total nitrogen removal rate is improved, and the deep and efficient denitrification is achieved.

Disclosure of Invention

The invention provides a device and a method for synchronously treating nitrate wastewater and domestic sewage by a two-section type reinforced PDAMOX process based on a biological membrane. Firstly, wastewater containing nitrate and urban domestic sewage enter a short-cut denitrification sequencing batch biofilm reactor together, and nitrate reducing bacteria convert nitrate nitrogen into nitrite nitrogen by using an organic carbon source in the domestic sewage; the effluent of the sequencing batch biofilm reactor containing ammonia nitrogen and nitrite nitrogen enters an anaerobic ammonia oxidation upflow anaerobic sludge blanket biofilm reactor, and the anaerobic ammonia oxidation bacteria convert the ammonia nitrogen and nitrite nitrogen into nitrogen and a small amount of nitrate nitrogen; and part of the effluent of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor flows back to the raw water tank, so that the generated nitrate nitrogen is further removed. Finally realizing the synchronous deep denitrification of the nitrate wastewater and the urban domestic sewage.

In order to realize the aim, the invention provides a device for synchronously treating nitrate wastewater and domestic sewage by a two-section type reinforced PDAMOX process based on a biological membrane, which comprises: the system comprises a raw water tank (1), a short-cut denitrification sequencing batch biofilm reactor (2), an intermediate water tank (3), an anaerobic ammonia oxidation upflow anaerobic sludge blanket biofilm reactor (4) and a sedimentation tank (5); the short-range denitrification sequencing batch biofilm reactor (2) comprises a membrane with the diameter of 20-50 mm and the density of 0.9-1.0 g/cm³The specific surface area is 200-800 m²/m³The device comprises a polyethylene hollow ring filler (2.3) with the porosity of 94-96% and the filling ratio of 15-25%, a stirrer (2.4), a first sampling port (2.5), a first water outlet (2.6), a drain valve (2.7), a vent pipe (2.8) and a first pH on-line tester (2.9); the anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor (4) comprises a second water inlet pump (4.1), a second water inlet (4.2), a second sampling port (4.3), a second water outlet (4.4), a backflow port (4.5), a first backflow pump (4.6), a third water inlet (4.7), a second emptying pipe (4.8), a three-phase separator (4.9), a second pH online tester (4.10) and a second backflow pump (4.11); the raw water tank (1) is connected with the short-cut denitrification sequencing batch biofilm reactor (2) through a first water inlet pump (2.1); the middle water tank (3) passes through a second water inlet pump(4.1) is connected with a second water inlet (4.2) of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor (4); in addition, the first pH on-line measuring instrument (2.9) and the second pH on-line measuring instrument (4.10) are connected with the process controller (6); a process controller (6) is connected with a computer (7) and is used for controlling a first water inlet pump (2.1), a second water inlet pump (4.1), a first reflux pump (4.6), a second reflux pump (4.11), a stirrer (2.4), a drain valve (2.7), a first pH online tester (2.9) and a second pH online tester (4.10); the automatic control system comprises a process controller (6) and a computer (7).

The method for synchronously treating nitrate wastewater and domestic sewage by a two-section type reinforced PDAMOX process based on a biological membrane is characterized by comprising the following steps of:

(1) starting the short-cut denitrification sequencing batch biofilm reactor: inoculating a polyethylene hollow ring filler, controlling the filling ratio of the filler to be 20-40%, and controlling the sludge concentration of the inoculated filler to be 2000-4000 mg/L; the influent wastewater is nitrate nitrogen and domestic sewage, and the mixing ratio of the nitrate wastewater and the domestic sewage is controlled to ensure that COD/NO in the influent wastewater is₃ ^-The mass concentration is controlled to be 2-4, wherein the nitrate concentration is 50-200 mg/L, the reactor operates for 6 cycles every day, each cycle is 4 hours, and the reactor comprises five stages of water inlet, stirring, precipitation, water drainage and idling, wherein the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the precipitation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and when the nitrite accumulation rate is more than 80%, the reactor is started successfully.

(2) Starting an anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor: firstly, inoculating a suspended filler attached with anaerobic ammonia oxidation sludge into an up-flow anaerobic sludge bed biomembrane reactor, controlling the sludge concentration of the inoculated up-flow anaerobic sludge bed biomembrane reactor filler to be 2000-5000 mg/L, controlling the inlet water to be artificially prepared nitrite nitrogen concentration of 100mg/L and ammonia nitrogen concentration of 100mg/L simulated wastewater, controlling the hydraulic retention time to be 6-15 h, controlling the ratio of outlet water backflow to inlet water flow to be 100-200%, and controlling the sludge age to be 6-15 d; when the removal rate of ammonia nitrogen and nitrite nitrogen in the effluent is more than 80%, the reactor is started successfully.

(3) And (3) combined operation:

the method comprises the steps that mixed wastewater containing domestic sewage and nitrate wastewater in a raw water tank enters a short-range denitrification SBBR reactor through a first water inlet pump, the operation is carried out for 6 cycles every day, the period is 4 hours every week, the mixed wastewater comprises five stages of water inlet, stirring, sedimentation, water drainage and idling, the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the sedimentation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and effluent enters an intermediate water tank.

And the wastewater in the intermediate water tank enters an anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor through a second water inlet pump, the hydraulic retention time is 6-15 h, and the pump speed of the first reflux pump is adjusted to control the ratio of the effluent reflux to the water inlet flow to be 100-200%. 50% of the effluent of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor is pumped into a raw water tank by a second reflux pump.

In the process, the water inlet pump, the reflux pump and the drain valve are controlled by an automatic control system.

The device and the method for synchronously treating nitrate wastewater and domestic sewage based on the two-section type reinforced PDAMOX technology of the biomembrane have the following characteristics and advantages:

(1) compared with complete denitrification, the short-cut denitrification saves partial carbon source, reduces the yield of the excess sludge and has high nitrogen removal rate; in addition, organic matters in the domestic sewage are used as a short-range denitrification carbon source, and an additional carbon source is not needed, so that the operation cost is saved;

(2) part of effluent of the upflow anaerobic sludge bed biomembrane reactor flows back to remove nitrate nitrogen generated by anaerobic ammoxidation, further improve effluent quality and solve the problem that nitrate nitrogen generated by anaerobic ammoxidation cannot be removed;

(3) the biomass can be effectively intercepted by adopting a mode of adding the carrier filler, and the robustness of the system to environmental changes is improved; the activity and abundance of bacteria are improved, so that stable and efficient denitrification is achieved;

(4) OH produced by short-cut denitrification process^-Can be used for the subsequent anaerobic ammonia oxidationThe process provides alkalinity.

Drawings

Fig. 1 is a device for synchronously treating nitrate wastewater and domestic sewage by a two-stage reinforced PDAMOX process based on a biological membrane, wherein: 1-raw water tank, 2-short-cut denitrification sequencing batch biofilm reactor, 3-intermediate water tank, 4-anaerobic ammoxidation up-flow anaerobic sludge bed biofilm reactor and 5-sedimentation tank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and detailed description.

As shown in fig. 1, the device for synchronously treating nitrate wastewater and domestic sewage based on the two-section enhanced PDAMOX process of the biofilm comprises a raw water tank (1), a short-cut denitrification sequencing batch biofilm reactor (2), an intermediate water tank (3), an anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor (4) and a sedimentation tank (5); the short-range denitrification sequencing batch biofilm reactor (2) comprises a membrane with the diameter of 20-50 mm and the density of 0.9-1.0 g/cm³The specific surface area is 200-800 m²/m³The device comprises a polyethylene hollow ring filler (2.3) with the porosity of 94-96% and the filling ratio of 15-25%, a stirrer (2.4), a first sampling port (2.5), a first water outlet (2.6), a drain valve (2.7), a vent pipe (2.8) and a first pH on-line tester (2.9); the anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor (4) comprises a second water inlet pump (4.1), a second water inlet (4.2), a second sampling port (4.3), a second water outlet (4.4), a backflow port (4.5), a first backflow pump (4.6), a third water inlet (4.7), a second emptying pipe (4.8), a three-phase separator (4.9), a second pH online tester (4.10) and a second backflow pump (4.11); the raw water tank (1) is connected with the short-cut denitrification sequencing batch biofilm reactor (2) through a first water inlet pump (2.1); the intermediate water tank (3) is connected with a second water inlet (4.2) of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor (4) through a second water inlet pump (4.1); in addition, the first pH on-line measuring instrument (2.9) and the second pH on-line measuring instrument (4.10) are connected with the process controller (6); the process controller (6) is connected with the computer (7) and is used for controlling the first water inlet pump (2.1), the second water inlet pump (4.1), the first reflux pump (4.6), the second reflux pump (4.11) and the stirringThe device comprises a device (2.4), a drain valve (2.7), a first pH on-line measuring instrument (2.9) and a second pH on-line measuring instrument (4.10); the automatic control system comprises a process controller (6) and a computer (7).

The specific operation process is as follows:

(1) starting the short-cut denitrification sequencing batch biofilm reactor: inoculating a polyethylene hollow ring filler of short-range denitrification sludge with incomplete nitrate reduction characteristics, controlling the filling ratio of the filler to be 20-40%, and controlling the concentration of the inoculated filler sludge to be 2000-4000 mg/L; the influent wastewater is nitrate nitrogen and domestic sewage, and the mixing ratio of the nitrate wastewater and the domestic sewage is controlled to ensure that COD/NO in the influent wastewater is₃ ^-The mass concentration is controlled to be 2-4, wherein the nitrate concentration is 50-200 mg/L, the reactor operates for 6 cycles every day, each cycle is 4 hours, and the reactor comprises five stages of water inlet, stirring, precipitation, water drainage and idling, wherein the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the precipitation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and when the nitrite accumulation rate is more than 80%, the reactor is started successfully.

(2) Starting an anaerobic ammonia oxidation upflow anaerobic sludge bed biofilm reactor: firstly, inoculating a suspended filler attached with anaerobic ammonium oxidation sludge into an up-flow anaerobic sludge bed biomembrane reactor, controlling the sludge concentration of the reactor filler after inoculation to be 2000-5000 mg/L, controlling the concentration of nitrite nitrogen in inlet water to be 100mg/L and the concentration of ammonia nitrogen to be 100mg/L, simulating wastewater, controlling the hydraulic retention time to be 6-15 h, controlling the ratio of outlet water backflow to inlet water flow to be 100-200%, and controlling the sludge age to be 6-15 d; when the removal rate of ammonia nitrogen and nitrite nitrogen in the effluent is more than 80%, the reactor is started successfully.

(3) And (3) combined operation:

the method comprises the steps that mixed wastewater containing domestic sewage and nitrate wastewater in a raw water tank enters a short-range denitrification SBBR reactor through a first water inlet pump, the operation is carried out for 6 cycles every day, the period is 4 hours every week, the mixed wastewater comprises five stages of water inlet, stirring, sedimentation, water drainage and idling, the water inlet time is controlled to be 10-20 min, the stirring time is controlled to be 60-120 min, the sedimentation time is controlled to be 50-100 min, the idling time is controlled to be 20-40 min, the water drainage ratio is controlled to be 40-60%, and effluent enters an intermediate water tank.

And the wastewater in the intermediate water tank enters an anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor through a second water inlet pump, the hydraulic retention time is 6-15 h, and the pump speed of the first reflux pump is adjusted to control the ratio of the effluent reflux to the water inlet flow to be 100-200%. 50% of the effluent of the anaerobic ammonia oxidation upflow anaerobic sludge bed biomembrane reactor is pumped into a raw water tank by a second reflux pump.

In the process, the water inlet pump, the reflux pump and the drain valve are controlled by an automatic control system.

The continuous test results show that:

the device can synchronously treat high-concentration nitrate nitrogen wastewater and urban domestic sewage, the ammonia nitrogen removal rate is more than 93.6%, the organic matter removal rate is more than 91.3%, the mass concentration of ammonia nitrogen in system effluent is less than 10mg/L, the mass concentration of nitrite nitrogen effluent is less than 5mg/L, and the mass concentration of nitrate nitrogen effluent is less than 10 mg/L.