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Method for mitigating MBR membrane fouling by using lanthanide compound

A lanthanide compound and membrane fouling technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of low selectivity of synthetic polymer additives, adverse effects of microbial activity, no Add lanthanide compounds and other problems to achieve the effect of improving the surface properties of sludge, increasing the maximum degradation rate, and slowing down membrane fouling

Pending Publication Date: 2019-04-12
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Various additives currently used can slow down the membrane fouling rate to a certain extent, but there are inevitably various defects, such as: the addition of fillers is not conducive to sludge discharge and easily breaks up sludge flocs; the presence of adsorbents such as powdered activated carbon The problem of difficult regeneration; the dosage of monomeric aluminum salt or iron salt is large and the effect is not obvious; the polymeric salt has an adverse effect on the activity of microorganisms in the reactor, and may cause secondary pollution to the environment; the natural polymer flocculant has long-term It will be gradually decomposed during operation; in addition, synthetic polymer additives have low selectivity and high cost
In summary, it is an important research topic in the field of membrane fouling to find additives that can continuously and effectively control membrane fouling with low cost. At present, there is no technology related to adding lanthanide compounds to membrane bioreactors to slow down membrane fouling.

Method used

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  • Method for mitigating MBR membrane fouling by using lanthanide compound
  • Method for mitigating MBR membrane fouling by using lanthanide compound
  • Method for mitigating MBR membrane fouling by using lanthanide compound

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Embodiment 1

[0024] Carry out sludge cultivation in the membrane bioreactor 3, when the sludge concentration in the membrane bioreactor 3 reaches 6000mg / L, add lanthanum chloride to the membrane bioreactor 3, the dosing concentration of lanthanum chloride is 60mg / L . Stable operating parameters of membrane bioreactor: Influent COD of a printing and dyeing wastewater in Shanghai is 600-900mg·L -1 , the pH is about 6-8, the temperature is about 25°C, and the aeration rate is 0.2m 3 / h. When the bioreactor was discharging sludge during operation, the lanthanide compound was supplemented to keep the lanthanum ion concentration at 50-70 mg / L. After the membrane bioreactor system operated stably for 109 days, the implementation results are shown in Table 1.

Embodiment 2

[0031] Carry out sludge cultivation in the membrane bioreactor 3, when the sludge concentration in the membrane bioreactor 3 reaches 6000mg / L, add lanthanum chloride to the membrane bioreactor 3, the dosing concentration of lanthanum chloride is 60mg / L . Stable operating parameters of membrane bioreactor: a salty wastewater in Shanghai, with a salinity of about 3% and a COD of 600-900 mg·L -1 , ammonia nitrogen is 14mg·L -1 The pH is about 6~8, the temperature is about 25°C, and the aeration rate is 0.2m 3 / h. When the bioreactor is discharging sludge during operation, the lanthanide compound is supplemented to keep the lanthanum ion concentration at 50-70mg / L. After 236 days of stable operation of the membrane bioreactor system, the implementation results are shown in Table 2.

Embodiment 3

[0038] Carry out sludge cultivation in the membrane bioreactor 3, when the sludge concentration in the membrane bioreactor 3 reaches 6000mg / L, add lanthanum chloride to the membrane bioreactor 3, the dosing concentration of lanthanum chloride is 60mg / L . Stable operating parameters of membrane bioreactor: Influent COD of a printing and dyeing wastewater in Shanghai is 600-900mg·L -1 , the pH is about 6-8, the temperature is about 25°C, and the aeration rate is 0.2m 3 / h. During the operation, when the bioreactor sludge was discharged, the lanthanide compound was supplemented to keep the lanthanum ion concentration at 50-70 mg / L. After the membrane bioreactor system operated stably for 176 days, the implementation results are shown in Table 3.

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Abstract

The invention discloses a method for mitigating MBR membrane fouling by using a lanthanide compound, and belongs to the technical field of membrane bioreactors and water treatment. In the sludge culture process of a membrane bioreactor, the lanthanide compound is added into the bioreactor and runs stably after being stirred, the coagulation effect is generated by utilizing the electric neutralization and net capturing sweeping functions of lanthanide, the speed of forming floccules is high, the floccules are compact, the water content is low, the turbidity removal rate is high, the effluent turbidity is low, and membrane fouling in the membrane bioreactor is effectively mitigated. During running, lanthanide mostly exists in activated sludge in the reactor, the problems of easy decomposition of a traditional additive and secondary effluent fouling are solved, and the feasibility of the lanthanide compound serving as the MBR additive in practical application is improved.

Description

technical field [0001] The invention belongs to the field of advanced treatment and regeneration of sewage, and in particular relates to a method for slowing down MBR membrane fouling by using lanthanide compounds. Background technique [0002] Membrane bioreactor (MBR) is a new type of water treatment process that combines membrane separation technology and bioreactor. Through the combination of membrane separation technology and biological treatment process, the membrane separation device replaces the secondary activated sludge treatment method in the traditional The secondary sedimentation tank can achieve high-efficiency solid-liquid separation. MBR was first used in the continuous fermentation process in the biochemical industry, but since Smith in the United States creatively introduced MBR into the wastewater treatment industry in 1969, MBR has been widely used in urban domestic sewage and biologically treatable industrial wastewater treatment processes, becoming A n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/00C02F1/44
CPCC02F1/44C02F3/00
Inventor 冀世锋杨行高春梅邢云青丁国栋方涵韩乃旭曹樟
Owner SHANGHAI OCEAN UNIV
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