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Method for improving nitrogen and phosphorus removal efficiency of sewage by enhancing denitrifying phosphorus accumulation through nitrite

A denitrification phosphorus and nitrite technology, applied in the field of environmental engineering, can solve the problems of low nitrogen and phosphorus removal efficiency, system collapse, high total nitrogen concentration, etc., to promote stable and efficient continuous operation, reduce carbon source consumption, remove Effect of Nitrogen and Phosphorus Removal Efficiency Enhancement

Active Publication Date: 2021-07-13
CHANGAN UNIV
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Problems solved by technology

In terms of microbial flora structure, the activity and abundance of APAO are significantly higher than that of DPAO, resulting in higher phosphorus concentration or higher total nitrogen concentration in the system effluent, and low efficiency of nitrogen and phosphorus removal in the system
The increase of total nitrogen in the effluent will lead to the denitrification of OHDO using the remaining total nitrogen in the anaerobic period of the next cycle. This process will also affect the reaction of PHA synthesis by phosphorus accumulating bacteria and polysaccharide bacteria, making the use of endogenous PHA for synchronous denitrification The function of phosphorus removal is lost, causing the system to collapse

Method used

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  • Method for improving nitrogen and phosphorus removal efficiency of sewage by enhancing denitrifying phosphorus accumulation through nitrite

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Embodiment

[0035]In this experiment, a plexiglass cylinder with an effective volume of 5L was used to run intermittently with water inflow and outflow to form an SBR reactor. The laboratory temperature is 28±1°C. The reactor feed water is mainly prepared by acetic acid, ammonium chloride and potassium dihydrogen phosphate. The influent COD concentration is 300mg / L, the total nitrogen concentration is 60mg / L, the total phosphorus concentration is 5mg / L, and the drainage ratio is 2 / 5. Run 4 cycles a day, each cycle is 6 hours, of which water intake + anaerobic 1 hour, micro oxygen 1.5-3 hours, anoxic 1-2.5 hours, static settling 0.5 hours, drainage and idle 0.5 hours. The aeration intensity is 0.04L / min, the dissolved oxygen DO is controlled at 0.1-0.25mg / L during the micro-aerobic period, and the sludge concentration is 4000mg / L. The running time of the micro-oxygen period is automatically controlled by the PLC-DO online monitoring system. When the dissolved oxygen is higher than 0.3mg / ...

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Abstract

The invention discloses a method for improving nitrogen and phosphorus removal efficiency of sewage by enhancing denitrifying phosphorus accumulation through nitrite, and belongs to the technical field of environmental engineering. For an SBR reactor which operates for 3 or 4 cycles every day in an anaerobic / micro-aerobic / anoxic mode, in a continuous enhanced denitrification stage of 15-20 days, one operation cycle in every day is changed into the anaerobic / anoxic mode, and a carbon source is added in the initial stage of an anaerobic stage of the anaerobic / anoxic mode, nitrite is added in the initial stage of an anoxic stage of the anaerobic / anoxic mode, and denitrifying phosphorus accumulation is enhanced. According to the invention, the flora structure of the system can be reasonably controlled, unnecessary carbon source consumption is reduced, and stable, efficient and continuous operation of the biological sewage treatment system is promoted.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for improving the nitrogen and phosphorus removal efficiency of sewage by strengthening denitrification and phosphorus accumulation with nitrite. Background technique [0002] As the main elements of water eutrophication, N and P need to be strictly controlled in the process of sewage treatment. In traditional biological wastewater treatment, N is mainly removed by aerobic ammonium oxidation and anoxic denitrification, and P is mainly removed by aerobic phosphorus accumulating bacteria (APAO) or denitrifying phosphorus accumulating bacteria (DPAO), and COD is absorbed through the anaerobic section. , synthesize PHA, release poly-P by hydrolysis, use oxygen or nitrate and nitrite as electron acceptors in the aerobic or anoxic section, and absorb phosphorus in excess, which is achieved by removing the remaining phosphorus-rich sludge. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/301C02F3/302C02F3/308C02F3/305C02F3/006C02F2305/06Y02W10/10
Inventor 赵剑强解舒婷杨文娟赵浚凯雷抒涵闫春晓马晓庆
Owner CHANGAN UNIV
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