CN112125398A - Device and method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal - Google Patents
Device and method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal Download PDFInfo
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- CN112125398A CN112125398A CN202010696013.2A CN202010696013A CN112125398A CN 112125398 A CN112125398 A CN 112125398A CN 202010696013 A CN202010696013 A CN 202010696013A CN 112125398 A CN112125398 A CN 112125398A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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Abstract
A device and a method for continuous flow side flow sludge fermentation synchronous denitrification and dephosphorization belong to the technical field of biological sewage treatment. The device comprises: the system comprises an urban sewage water tank, an anoxic zone for continuous flow, an aerobic zone, a side flow fermentation zone and a secondary sedimentation tank. The method is characterized in that return sludge in a secondary sedimentation tank firstly enters a side flow sludge fermentation area, and the phosphorus accumulating bacteria Tetrasphaera with fermentation capacity utilizes activated sludge as a substrate to carry out fermentation, releases phosphate and generates volatile fatty acid VFA for other heterotrophic bacteria to utilize. Then the effluent of the sludge fermentation zone and the influent of the municipal sewage enter an anoxic zone of a continuous flow reaction zone together for denitrification nitrogen and phosphorus removal, and then enter an aerobic section for aerobic phosphorus absorption and nitrification. The invention utilizes the continuous flow process to synchronously denitrify and dephosphorize the sludge fermentation, solves the problem of difficult sludge treatment, saves the floor area and simplifies the process flow because the traditional preposed anaerobic zone is not arranged, and has important significance for treating the urban sewage.
Description
Technical Field
The invention relates to a device and a method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal, belonging to the technical field of biological sewage treatment.
Background
The excess sludge is a product of a sewage treatment plant in the biological sewage treatment process, is sludge discharged after passing through a secondary sedimentation tank, has high microorganism content, and can cause serious pollution to the environment when being poured and buried randomly. With the increase of sewage treatment capacity, the sludge yield is increased, and the treatment of excess sludge becomes a difficult problem for sewage treatment plants. Water eutrophication has become a global water environment problem, and a great deal of research shows that the excessive discharge of sewage rich in nitrogen and phosphorus is the main cause of surface water eutrophication, and the biological nitrogen and phosphorus removal process is widely applied to sewage treatment plants, so how to treat residual sludge on the basis of effective nitrogen and phosphorus removal becomes a difficult problem in the field of sewage treatment.
Most of the existing researches on sludge fermentation coupled biological nitrogen and phosphorus removal use sludge fermentation supernatant as a carbon source, the sludge fermentation supernatant is added into a biological nitrogen and phosphorus removal process, the operation is complex, and the sludge fermentation mostly needs pretreatment, so that the sludge treatment cost is increased. The invention realizes synchronous nitrogen and phosphorus removal of sludge fermentation in the continuous flow process, simplifies the treatment process of excess sludge, has simple operation and easy control, and provides a new way for the treatment of excess sludge in the biological nitrogen and phosphorus removal process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a device and a method for continuous flow side-stream sludge fermentation and simultaneous nitrogen and phosphorus removal. The return sludge in the secondary sedimentation tank firstly enters a side flow sludge fermentation area, and the phosphorus accumulating bacteria Tetrasphaera with fermentation capacity utilizes activated sludge as a substrate for fermentation, releases phosphate and generates volatile fatty acid VFA for other heterotrophic bacteria. Then the effluent of the sludge fermentation zone and the influent of the municipal sewage enter an anoxic zone of a continuous flow reaction zone together for denitrification nitrogen and phosphorus removal, and then enter an aerobic section for aerobic phosphorus absorption and nitrification.
The technical scheme of the invention is as follows:
a continuous flow and side flow sludge fermentation synchronous nitrogen and phosphorus removal device comprises a municipal sewage water tank (1), a water inlet peristaltic pump (2), a main flow reaction zone, a nitrification liquid reflux pump (7), a secondary sedimentation tank (8), a secondary sedimentation tank drain hole (9), a secondary sedimentation tank bottom valve (10), a sludge reflux pump (11), a side flow fermentation zone (12) and a stirrer (12.1), and a fermentation zone water outlet pump (13), wherein the main flow reaction zone comprises an anoxic zone (3) and is provided with the stirrer (3.1), an aerobic zone (4) and is provided with the stirrer (4.1), an air pump (5), a rotor flow meter (6);
municipal sewage water tank (1) is connected with anoxic zone (3) of mainstream reaction zone through intake peristaltic pump (2), anoxic zone is connected with aerobic zone (4), air pump (5) are connected with aerobic zone aeration head through rotameter (6), aerobic zone is connected with anoxic zone through nitrifying liquid backwash pump (7), aerobic zone goes out water and is connected with two heavy ponds (8), two heavy ponds include wash port (9) and bottom valve (10), two heavy ponds pass through mud backwash pump (11) and are connected with side stream fermentation zone (12), side stream fermentation zone passes through fermentation zone effluent pump (13) and is connected with anoxic zone (3) of mainstream reaction zone.
The method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal by using the device comprises the following steps:
(1) inoculating the excess sludge of the municipal sewage treatment plant into the continuous flow reactor, and controlling the sludge concentration in the reactor after inoculation to be 4000-;
(2) the return sludge in the secondary sedimentation tank (8) enters a lateral flow fermentation zone (12) through a sludge return pump (11), the return proportion of the secondary sedimentation tank is 90-110% compared with the inflow rate, and the hydraulic retention time of the lateral flow fermentation zone is 7-9 h;
(3) the water inlet adopts urban sewage and is injected into the water tank (1). The effluent of the side-stream fermentation zone enters a main stream anoxic zone together with the inlet water through a fermentation zone effluent pump (13) for denitrification and dephosphorization, the sludge reflux proportion of the side-stream zone is 90-110% compared with the inlet water flow, the sludge reflux proportion of the side-stream zone is consistent with the sludge reflux proportion of a secondary sedimentation tank, and the hydraulic retention time of the anoxic zone is 3-5 h;
(4) the effluent of the anoxic zone flows into the aerobic zone (4), the air pump (5) continuously aerates through an aeration head arranged in the aerobic zone, the concentration of dissolved oxygen is 2-3mg/L, and the hydraulic retention time of the aerobic zone is 3-4 h. The nitrification and the aerobic phosphorus absorption are completed in the aerobic zone, and the nitrification liquid in the aerobic section flows back to the anoxic section according to the proportion of 250 to 350 percent of the inlet water by utilizing a nitrification liquid reflux pump. The sludge age of the continuous flow reactor is 18-20 days.
In conclusion, compared with the conventional biological nitrogen and phosphorus removal process, the continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal device and method provided by the invention have the following advantages:
(1) while nutrients in the sewage are effectively removed, the activated sludge can be used as a substrate for sludge fermentation, so that the sludge treatment cost is reduced;
(2) the sludge is not required to be pretreated, and the operation is simple and easy to control;
(3) the traditional preposed anaerobic zone is not arranged, so that the occupied area is saved, and the process flow is simplified.
Drawings
FIG. 1 is a schematic view of the structure of the apparatus of the present invention
In the figure: 1-urban sewage tank; 2-inlet peristaltic pump; 3-anoxic zone; 3.1-anoxic zone agitator; 4-aerobic zone; 4.1-aerobic zone agitator; 5-air pump; 6-rotameter; 7-nitrifying liquid reflux pump; 8-secondary sedimentation tank; 9-a drain hole of the secondary sedimentation tank; 10-a valve at the bottom of the secondary sedimentation tank; 11-sludge reflux pump; 12-a side stream fermentation zone; 12.1-side stream fermentation zone stirrer; 13-water pump for fermentation zone.
Detailed Description
The patent application is further described with reference to the accompanying drawings and examples: as shown in figure 1, the device comprises an urban sewage water tank (1) connected with an anoxic zone (3) of a main flow reaction zone through a water inlet peristaltic pump (2), the anoxic zone connected with an aerobic zone (4), an air pump (5) connected with an aeration head of the aerobic zone through a rotor flow meter (6), the aerobic zone connected with the anoxic zone through a nitrifying liquid reflux pump (7), effluent of the aerobic zone connected with a secondary sedimentation tank (8), the secondary sedimentation tank comprising a drain hole (9) and a bottom valve (10), the secondary sedimentation tank connected with a side flow fermentation zone (12) through a sludge reflux pump (11), and the side flow fermentation zone connected with the anoxic zone (3) of the main flow reaction zone through a fermentation zone effluent pump (13).
Municipal wastewater NH used in the examples4 +The N concentration is 60-70mg/L, the P concentration is 4-5mg/L, and the COD concentration is 200-220 mg/L.
The specific implementation process is as follows:
(1) inoculating the excess sludge of the municipal sewage plant into a continuous flow reactor, and controlling the sludge concentration in the reactor after inoculation to be 4500 mg/L;
(2) the return sludge in the secondary sedimentation tank (8) enters a side-stream fermentation zone (12) through a sludge return pump (11), the sludge returns according to the proportion of 100 percent of the inlet water, the hydraulic retention time of the side-stream fermentation zone is 8 hours, the phosphorus accumulating bacteria Tetrasphaera with fermentation capacity utilizes the activated sludge to carry out sludge fermentation, phosphate is released, the concentration of P in the outlet water of the side-stream fermentation zone is 30mg/L, and the concentration of dissolved COD generated by fermentation is 30 mg/L;
(3) the water inlet adopts urban sewage and is injected into the water tank (1). The outlet water of the side flow fermentation zone enters the main flow anoxic zone together with inlet water through a fermentation zone outlet water pump (13) for denitrification and dephosphorization, and the sludge reflux proportion of the side flow zone is 100 percent compared with the inlet water flow and is consistent with the sludge reflux proportion of the secondary sedimentation tank. The hydraulic retention time of the anoxic zone is 4 h;
(4) the effluent of the anoxic zone flows into the aerobic zone (4), the air pump (5) continuously aerates through an aeration head arranged in the aerobic zone, the concentration of dissolved oxygen is 2.5mg/L, and the hydraulic retention time of the aerobic zone is 3.5 h. The nitrification and the aerobic phosphorus absorption are completed in the aerobic zone, and the nitrification liquid in the aerobic section flows back to the anoxic section according to the proportion of 300 percent of the nitrification liquid in the inflow water by utilizing a nitrification liquid reflux pump. The sludge age of the continuous flow reactor is 19 d.
(5) The results show that: the concentration of P in the effluent is 0.36mg/L, the removal rate of ammonia nitrogen is 100%, the concentration of COD in the effluent is 30-40mg/L, and the removal rate of total nitrogen is 86%.
Claims (2)
1. A continuous flow side flow sludge fermentation synchronous nitrogen and phosphorus removal device is characterized in that: the device comprises an urban sewage water tank (1), a water inlet peristaltic pump (2), a main flow reaction zone, a secondary sedimentation tank (8), a secondary sedimentation tank drain hole (9), a secondary sedimentation tank bottom valve (10), a sludge reflux pump (11), a side flow fermentation zone (12) and a stirrer (12.1), wherein the main flow reaction zone comprises an anoxic zone (3) and is provided with the stirrer (3.1), an aerobic zone (4) and is provided with the stirrer (4.1), an air pump (5), a rotor flow meter (6), a nitrifying liquid reflux pump (7), and a fermentation zone water outlet pump (13);
municipal sewage water tank (1) is connected with anoxic zone (3) of mainstream reaction zone through intake peristaltic pump (2), anoxic zone is connected with aerobic zone (4), air pump (5) are connected with aerobic zone aeration head through rotameter (6), aerobic zone is connected with anoxic zone through nitrifying liquid backwash pump (7), aerobic zone goes out water and is connected with two heavy ponds (8), two heavy ponds include wash port (9) and bottom valve (10), two heavy ponds pass through mud backwash pump (11) and are connected with side stream fermentation zone (12), side stream fermentation zone passes through fermentation zone effluent pump (13) and is connected with anoxic zone (3) of mainstream reaction zone.
2. The method for simultaneous denitrification and dephosphorization of continuous flow side-stream sludge fermentation by using the device of claim 1 is characterized by comprising the following steps:
(1) inoculating the excess sludge of the municipal sewage treatment plant into the continuous flow reactor, and controlling the sludge concentration in the reactor after inoculation to be 4000-;
(2) the return sludge in the secondary sedimentation tank (8) enters a lateral flow fermentation zone (12) through a sludge return pump (11), the return proportion of the secondary sedimentation tank is 90-110% compared with the inflow rate, and the hydraulic retention time of the lateral flow fermentation zone is 7-9 h;
(3) the water inlet adopts urban sewage and is injected into the water tank (1). The effluent of the side-stream fermentation zone enters a main stream anoxic zone together with the inlet water through a fermentation zone effluent pump (13) for denitrification and dephosphorization, the sludge reflux proportion of the side-stream zone is 90-110% compared with the inlet water flow, the sludge reflux proportion of the side-stream zone is consistent with the sludge reflux proportion of a secondary sedimentation tank, and the hydraulic retention time of the anoxic zone is 3-5 h;
(4) the effluent of the anoxic zone flows into the aerobic zone (4), the air pump (5) continuously aerates through an aeration head arranged in the aerobic zone, the concentration of dissolved oxygen is 2-3mg/L, and the hydraulic retention time of the aerobic zone is 3-4 h. The nitrification and the aerobic phosphorus absorption are completed in the aerobic zone, and the nitrification liquid in the aerobic section flows back to the anoxic section according to the proportion of 250 to 350 percent of the inlet water by utilizing a nitrification liquid reflux pump. The sludge age of the continuous flow reactor is 18-20 days.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010696013.2A CN112125398A (en) | 2020-07-20 | 2020-07-20 | Device and method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal |
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| CN202010696013.2A CN112125398A (en) | 2020-07-20 | 2020-07-20 | Device and method for continuous flow side-stream sludge fermentation synchronous nitrogen and phosphorus removal |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205687760U (en) * | 2016-06-23 | 2016-11-16 | 北京汇恒环保工程股份有限公司 | A kind of dephosphorization denitrogenation equipment |
| CN106573811A (en) * | 2014-06-17 | 2017-04-19 | 诺维信公司 | Biological phosphorus removal from wastewater |
| WO2019032477A1 (en) * | 2017-08-07 | 2019-02-14 | Novozymes A/S | A process for treating wastewater comprising treating sludge with hydrolytic enzymes |
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- 2020-07-20 CN CN202010696013.2A patent/CN112125398A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106573811A (en) * | 2014-06-17 | 2017-04-19 | 诺维信公司 | Biological phosphorus removal from wastewater |
| CN205687760U (en) * | 2016-06-23 | 2016-11-16 | 北京汇恒环保工程股份有限公司 | A kind of dephosphorization denitrogenation equipment |
| WO2019032477A1 (en) * | 2017-08-07 | 2019-02-14 | Novozymes A/S | A process for treating wastewater comprising treating sludge with hydrolytic enzymes |
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