Nitrified sludge efficient enriching culture system based on membrane bioreactor and method

A membrane bioreactor and enrichment culture technology, which is applied in the field of high-efficiency enrichment and culture systems for nitrification sludge, can solve the problems of unfavorable continuous enrichment, continuous addition, sudden change in ammonia nitrogen load, and high cost of centrifugal fermentation, reducing construction volume and reducing costs. The effect of enrichment time, cost savings, and enhanced nitrification enhancement

Inactive Publication Date: 2012-09-19
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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Problems solved by technology

This method has a sudden change in ammonia nitrogen load, which is prone to matrix inhibition on nitrifying bacteria; and in mass production, the cost of centrifugal fermentation is high and it is not conducive to continuous enrichment and continuous dosing

Method used

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  • Nitrified sludge efficient enriching culture system based on membrane bioreactor and method
  • Nitrified sludge efficient enriching culture system based on membrane bioreactor and method

Examples

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Embodiment 1

[0034] A municipal sewage treatment plant adopts A 2 / O treatment process, the treated water volume is 25,000 m 3 / d, the effective volume of the aerobic pool is about 7000m 3 , the concentration of ammonia nitrogen in the influent and effluent water is 50mg / L and 15mg / L respectively, and the nitrification activity is 120mgN / L·d. Now the ammonia nitrogen in the effluent is reduced to 5mg / L, which meets the national "Urban Sewage Treatment Plant Pollutant Discharge Standard" (GB18918-2002) Class A discharge standard. The volume of construction near the sewage treatment process (main process) is 310m 3 The bypass system (accounting for about 4.5% of the main process volume) implements continuous enrichment of nitrifying bacteria and continuous dosing to the main process.

[0035] The bypass system is inoculated with the activated sludge of the sewage plant, the initial MLSS is controlled at 5g / L, and it operates in a completely mixed continuous water inlet and outlet mode. E...

Embodiment 2

[0038] A sewage treatment plant in an industrial park with a treatment volume of 10,000 m 3 / d, using hydrolytic acidification-aerobic activated sludge treatment process, the effective volume of the aerobic pool is 10,000 m 3 . Affected by the wastewater discharge of network-connected enterprises in the park, the quality and quantity of influent water vary greatly, which often has a great impact on the activated sludge system, resulting in the collapse of the nitrification function. It often takes more than two months to restore the nitrification performance, and the cycle is long. Seriously affected the stable and up-to-standard discharge of the treated effluent of the sewage plant. Build an effective volume of 450m near the aerobic pool in the sewage plant 3 The nitrifying bacteria bypass enrichment system (4.5% of the effective volume of the aerobic section) is inoculated with the main process activated sludge, the initial MLSS is controlled at 5g / L, and it operates in a ...

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Abstract

The invention relates to a nitrified sludge efficient enriching culture system based on a membrane bioreactor and a method. The system comprises an ammonia nitrogen and trace element storage tank, wherein a stirrer is arranged inside the ammonia nitrogen and trace element storage tank, the ammonia nitrogen and trace element storage tank is connected with the membrane bioreactor through a liquid conveying pump, a pH regulating liquid storage tank is also connected with the membrane bioreactor through the pH regulating liquid conveying pump, and a water inlet connected with a water inlet pump, a water outlet connected with a water outlet pump and a sludge discharge opening connected with the sludge discharge pump are respectively arranged on the membrane bioreactor. The system and the method provided by the invention have the basic characteristic that the membrane bioreactor system is used for realizing the semi-sealed enriching culture on the nitrified sludge. Compared with the fermentation culture of nitrobacterium agents, the system and the method provided by the invention have the advantages that the nitrobacterium culture cost is greatly reduced, the thorough separation of the nitrobacterium and the culture substrate is realized, and the unnecessary loss of the nitrobacterium in the culture process is effectively avoided.

Description

technical field [0001] The invention relates to a system and method for high-efficiency enrichment and cultivation of nitrification sludge based on a membrane bioreactor, and belongs to the technical field of sewage treatment. Background technique [0002] In the existing sewage treatment process, biological denitrification is mainly completed by nitrifying bacteria and denitrifying bacteria, among which nitrifying bacteria are aerobic autotrophic bacteria with long generations, slow proliferation, low sludge yield, and are sensitive to external environmental conditions , it is difficult to maintain a high bioconcentration. The slow start of nitrification function and insufficient nitrification capacity have become the bottleneck restricting the denitrification effect of many sewage treatment plants. It takes more than 30 days for the existing sewage plants to make the effluent ammonia nitrogen reach the standard, that is, the system has a complete nitrification function, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 刘锐安少锋陈吕军施汉昌罗金飞余素林文晓刚
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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