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A sewage treatment system and treatment method combining membrane bioreactor and phosphorus recovery process

A technology of membrane bioreactor and sewage treatment method, which is applied in the direction of biological water/sewage treatment, biological sludge treatment, water/sewage treatment, etc., can solve the problems of low efficiency and non-targeted phosphorus removal methods, etc., and achieve reduction The use, enhanced biodegradability, simple effect of phosphorus recovery

Active Publication Date: 2019-12-27
SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method does not have a targeted phosphorus removal method, and cannot effectively trap the phosphorus in the sewage in the activated sludge for further recovery, resulting in low efficiency of phosphorus recovery from sewage

Method used

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  • A sewage treatment system and treatment method combining membrane bioreactor and phosphorus recovery process
  • A sewage treatment system and treatment method combining membrane bioreactor and phosphorus recovery process
  • A sewage treatment system and treatment method combining membrane bioreactor and phosphorus recovery process

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Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a sewage treatment system combining membrane bioreactor and phosphorus recovery process, including: coagulation tank, membrane bioreactor, anaerobic fermentation tank and sedimentation recovery tank, connected in sequence, wherein,

[0034] The coagulation tank and the membrane bioreactor are connected through the raw water pump and the pumping pipeline, and the bottom of the membrane bioreactor is equipped with an aeration head, which is connected to the external air flow meter and the air pump in turn through the air pipeline;

[0035] The membrane module is vertically submerged in the reactor, and is sequentially connected to the suction pressure gauge and the suction pump outside the reactor through the suction pipeline;

[0036] The membrane bioreactor and the anaerobic fermentation tank are connected by two channels: one channel includes the pumping pipeline and the sludge pump for pumping the phosphorus-containing sludge in the membrane...

Embodiment 2

[0039] Adopt the sewage treatment method that a kind of membrane bioreactor of the treatment system of embodiment 1 combines with phosphorus recovery process, comprise:

[0040] (1) Municipal sewage is pumped into the coagulation tank and mixed with ferric chloride, and stirred rapidly (speed>200RPM) to form flocs and ferric phosphate co-precipitates. The hydraulic retention time of the coagulation tank is 1-2 minutes.

[0041] (2) The mixed liquid in the coagulation tank is pumped into the membrane bioreactor. Membrane bioreactors are inoculated with activated sludge (4-5g / L) to degrade pollutants in sewage. After being filtered by the membrane module, the co-precipitated ferric phosphate is trapped in the membrane bioreactor and mixed with activated sludge to form phosphorus-containing sludge. The treated water is pumped out by the suction pump through membrane separation technology. Water flow control to 0.4 ~ 0.5m 3 / m2 -d. The hydraulic retention time of the reactor ...

Embodiment 3

[0044] Embodiment 3: periodic operation membrane bioreactor and phosphorus recovery system

[0045] Using the scheme of Example 2, the reactor continued to operate for 70 days, and the removal and recovery effects of phosphorus in municipal sewage were observed. The hydraulic retention time of the membrane bioreactor is 12 hours, the sludge retention time is 30 days, and the effluent flux is controlled to 0.42m 3 / m 2 -d. Add kitchen waste as a carbon source, and the dosage is 2g / L. The result is as figure 2 with image 3 shown. The total phosphorus concentration in the influent is about 5.40mg / L. The total phosphorus concentration in the effluent is about 0.11mg / L. 97.9% of the total phosphorus in the sewage is trapped in the membrane bioreactor and mixed with the activated sludge to form phosphorus-containing sludge. The total phosphorus concentration of the sludge reaches 101mg / L. Through anaerobic fermentation, the pH of the solution is reduced to 4.5-5.0, and an ...

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Abstract

The invention is mainly applied to the technical field of municipal sewage treatment, and mainly relates to a sewage treatment system and treatment method in combination with a membrane bioreactor and a phosphorus recovery process. In combination with a biological method and a chemical method, anaerobic acidification is used for replacing a chemically acidified and dissolved iron phosphate precipitate, and a microorganism dissimilatory iron reduction effect is used for increasing phosphate solubility. The treatment system is applied to activated sludge but not remaining sludge, phosphorus recovery is realized in a weak acid condition, secondary pollution is not caused, inert constituents inside the activated sludge are reduced, the biodegradability of the activated sludge is strengthened, the application of the membrane reactor can realize that the sludge retention time reaches infinity, and the phosphorus recovery efficiency reaches 95% or more. Compared with the chemical method, the treatment method is simple, safe and environmentally-friendly in phosphorus recovery, the application of strong acid and strong base is greatly reduced, and the recovery cost is reduced; and compared with the chemical method, the treatment method is stable and efficient.

Description

technical field [0001] The invention is mainly applied in the technical field of municipal sewage treatment, and mainly relates to a sewage treatment system and a treatment method combining a membrane bioreactor and a phosphorus recovery process. Background technique [0002] Phosphorus is one of the main pollutants in sewage that cause eutrophication of water bodies. Phosphorus is also an irreplaceable resource in food safety. Phosphate-containing rocks have limited reserves on the earth. It is estimated that at the current rate of mining, all phosphate rocks on the earth will be exhausted by the end of this century. The study pointed out that the phosphorus treated in sewage accounts for 15% of the global phosphorus demand every year. Therefore, phosphorus recovery from sewage has become an effective means to alleviate the phosphorus crisis. The current phosphorus recovery methods are mainly divided into chemical methods and biological methods. The chemical method is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F11/04C01B25/37C02F101/10
CPCC01B25/375C02F1/5245C02F3/1268C02F11/04C02F2101/105C02F2201/007Y02W10/10
Inventor 李晓岩李若泓李炳王未君
Owner SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
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