Method for enhanced phosphorus removal of membrane bioreactor

A technology of membrane bioreactor and chemical phosphorus removal, which is applied in the direction of chemical instruments and methods, biological treatment devices, biological water/sewage treatment, etc., and can solve the problems of unsatisfactory phosphorus removal effect, decreased membrane flux, and chemical sludge membrane hazards To achieve the effect of reducing phosphorus removal effect and the adverse effects of membrane flux and membrane service life, improving efficiency and effect, and ensuring phosphorus removal effect

Active Publication Date: 2019-03-29
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although MBR synergistic chemical phosphorus removal can remove most of the phosphorus, the phosphorus removal effect is not ideal. Due to the continuous aeration in the reactor, it is difficult to flocculate the phosphorus sediment, so the phosphorus chemical sludge contains micro Flocs, some of these micro flocs can pass through the membrane, which increases the concentration of phosphorus in the effluent; in addition, the increase in the concentration of ch

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  • Method for enhanced phosphorus removal of membrane bioreactor
  • Method for enhanced phosphorus removal of membrane bioreactor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The COD value of sewage influent decreased from 216mg / L to 165mg / L within two weeks, and the ORP value in the anaerobic pool in the biochemical area increased from -373.21mV to -300.56mV due to the large fluctuation of influent pollutant load. like figure 2 As shown, only by adjusting the secondary reflux ratio from 300% to 290%, and the tertiary reflux ratio from 100% to 95%, the phosphorus removal efficiency reaches 92.13%, and the total phosphorus concentration of phosphorus removal purified water is 0.24mg / L, reaching the effluent discharge standard.

Embodiment 2

[0054] Further monitoring on the basis of Example 1 showed that the ORP value of the anaerobic pool in the biochemical zone increased from -300.56mV to -248.68mV within one month due to the large fluctuation of pollutant load in the sewage inflow. like figure 2 As shown, only by adjusting the secondary reflux ratio from 290% to 240%, and the tertiary reflux ratio from 95% to 80%, the phosphorus removal efficiency reaches 92.57%, and the total phosphorus concentration of phosphorus removal purified water is 0.15mg / L, reaching the effluent discharge standard.

Embodiment 3

[0056] On the basis of Example 2, further monitoring showed that the ORP value of the anaerobic pool in the biochemical zone increased from -248.68mV to -180.34mV within one month due to the large fluctuation of pollutant load in the sewage inflow. like figure 2 As shown, the secondary reflux ratio is reduced from 240% to 180%, and the tertiary reflux ratio is reduced from 80% to 70% only by adjustment. The phosphorus removal efficiency reaches 84.02%, and the total phosphorus concentration of the phosphorus removal purified water is 0.27mg / L, reaching the effluent discharge standard.

[0057] Conclusion: As can be seen from Examples 1-3, by reducing the secondary reflux ratio and the tertiary reflux ratio, the amount of dissolved oxygen in the aerobic tank refluxed to the anoxic tank and the anaerobic tank is reduced, and the anaerobic tank is ensured. Oxygen environment and good anaerobic phosphorus release efficiency not only effectively improve the efficiency of phosphor...

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Abstract

The invention discloses a method for enhanced phosphorus removal of a membrane bioreactor. The method comprises the following steps: introducing sewage into an anaerobic pond for anaerobic treatment;introducing anaerobic purified water into an anoxic pond for anoxic treatment; introducing anoxic purified water into an aerobiotic pond for aerobiotic treatment; introducing aerobiotic purified waterinto a membrane pond and adding chemical phosphorus removal drugs for chemical phosphorus removal treatment; performing first-level reflux treatment on a part of phosphorus-removed purified water andreturning to the aerobiotic pond; performing second-level reflux treatment on a part of aerobiotic purified water and returning into the anoxic pond; performing third-level reflux treatment on a partof anoxic purified water and returning into the anaerobic pond. Total phosphorus concentration of phosphorus-removed purified water can be reduced by adjusting second-level reflux ratio, third-levelreflux ratio and/or dosage of chemical phosphorus removal drugs. The method provided by the invention is capable of flexibly and effectively coping with fluctuation of pollutant load of to-be-treatedsewage, realizing synchronous carbon removal and nitrogen and phosphorus removal, guaranteeing total phosphorus concentration of phosphorus-removed purified water not higher than 0.3 mg/L all the time and reaching level A standard of urban wastewater discharge.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for strengthening phosphorus removal in a membrane bioreactor. Background technique [0002] Membrane bioreactor (MBR) is a new and efficient sewage treatment technology that combines membrane separation and biological treatment. Membrane bioreactor technology has many obvious advantages that other biological treatment processes cannot match, mainly for high volume load, strong load resistance, low sludge yield, good treatment effect, excellent effluent quality, small footprint, and process equipment Centralized, full automatic control can be realized. Among them, biological phosphorus removal mainly absorbs phosphorus from the external environment excessively through phosphorus accumulating bacteria, stores it in the body in the form of polyphosphate, forms phosphorus-rich sludge, and removes phosphorus from sewage by discharging excess sludge. Ef...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/10
CPCC02F1/58C02F3/308C02F2101/105C02F2203/006C02F2209/04C02F2301/046
Inventor 黄霞徐慧刘艳臣张硕江海莎程献伟曹佳红叶传刚吴小一刘思齐
Owner TSINGHUA UNIV
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