Flocculation method for prevemting membrane from pollution and maintaining flux of membrane

A membrane flux, membrane fouling technology, applied in chemical instruments and methods, sustainable biological treatment, biological water/sewage treatment, etc., can solve the problems of increased treatment costs, complex equipment, and high prices

Inactive Publication Date: 2004-03-10
TIANJIN UNIV
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Problems solved by technology

This measure has been proven to be effective, but it is very inconvenient to operate, and the adsorption capacity of activated carbon and other substances is limited, so it needs to be added continuously, and its price is high, which increases the treatment cost.
In addition, backwashing (gas backwashing, water backwashing, gas-water backwashing) and chemical cleaning are also common membrane fouling recovery measures, but the equipment is complex, which is not conducive to improving the overall MTBF of the membrane bioreactor, and Chemical cleaning may cause secondary pollution, and follow-up treatment is required
Under this technical background, the existing membrane pollution prevention and control measures cannot meet the needs of membrane bioreactor technology promotion, so the present invention proposes new membrane pollution prevention and control measures in order to achieve satisfactory membrane pollution control effects at a lower cost

Method used

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Embodiment Construction

[0009] The membrane bioreactor adopts polyvinylidene fluoride (PVDF) hollow fiber microfiltration membrane module, the nominal pore size of the membrane is 0.22μm, and the effective area is 0.5m 2 . The design water flow rate of the membrane bioreactor is 4L / h, the air-water ratio is 20:1, the hydraulic retention time is 6 hours, and the sludge age is 30 days. The water inflow and aeration are kept continuous throughout the test.

[0010] The membrane bioreactor has been in operation for 30 days and it has been found that the accumulation trend of organic matter in the mixed solution is very obvious. On the 21st day of operation, the mixed solution COD Cr (chemical oxygen demand) reached 306.37mg / L, and the membrane flux also dropped to 20L / (h·m 2 ).

[0011] At this time, the flocculation process is adopted: (1) preparation of FeCl 3 solution and add it into the reactor, and control its concentration in the reactor to be 50mg / L (calculated as iron); (2) the aeration rate i...

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Abstract

A flocculating method for preventing pollution to membrane of membrane bioreactor and maintaining the membrane throughput includes adding iron salt solution to membrane bioreactor, stirring or aerating for providing turbulence while reaction to generate flocculate, and discharging sludge. Its advantages are high effect etc.

Description

technical field [0001] The invention relates to a sewage treatment technology, more precisely, it belongs to the improvement of the membrane module in the sewage treatment equipment-membrane bioreactor. Background of the invention [0002] At present, due to the lack of global water resources, various sewage reuse processes have been widely used, and membrane bioreactor technology is one of them. Since the membrane modules in the membrane bioreactor are inevitably polluted during operation, their service life has a certain time limit, which increases the operating cost of the membrane bioreactor and limits the application of this technology. For this reason, various measures have been used to delay membrane fouling, but their application effects are not satisfactory. Increasing the aeration rate in the membrane bioreactor is one of the measures to control membrane fouling. This measure can increase the turbulence of the mixed liquid in the mem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/10
CPCY02W10/10
Inventor 顾平张颖布多
Owner TIANJIN UNIV
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