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Method for regulating and controlling sludge quality in membrane bioreactor

A membrane bioreactor and sludge technology, applied in the direction of aerobic and anaerobic process treatment, can solve the problems of complicated membrane pollution factors, high operating cost MBR, and no physical and chemical characteristics of biological pollution layer, so as to improve the settlement and Hydrophobic properties, promotion of growth balance, improvement of sedimentation properties and effects of hydrophobicity

Inactive Publication Date: 2010-05-05
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the high operating cost caused by membrane fouling is the main reason for the application limitations of MBR.
[0004] The factors of membrane fouling are complex
Although it is still difficult to explain the influence of membrane biofouling on membrane flux from a molecular point of view, there is no mathematical relationship between the physical and chemical properties of the biofouled layer (membrane thickness, roughness, microbial composition, water content, etc.) and membrane flux. However, it is generally believed that the decrease in membrane flux is mainly caused by the interaction of bacteria and extracellular polymeric substances (EPS) adhering to the membrane surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The inoculum sludge was taken from the surplus sludge of Lucun Sewage Treatment Plant in Wuxi City, Jiangsu Province, and was domesticated and cultured for two weeks. The influent COD concentration is 420.0mg / L, the ammonia nitrogen concentration is 10.7mg / L, and the pH value is 7.0; the hydraulic retention time is 12h, of which the water inflow is 5min, the aeration is 680min, the settlement is 30min, and the water outlet is 5min; no sludge is discharged during operation. The results show that the COD of the effluent from the MBR system is 36.0mg / L, and the concentration of ammonia nitrogen is 0.1mg / L, which meets the first-class A standard in the national urban sewage treatment plant pollutant discharge standard (GB 18918-2002) and urban sewage recycling-urban Miscellaneous water quality standard (GB / T 18920-2002); MLSS in MBR is 10.6g / L, VSS is 5.5g / L; relative hydrophobicity of sludge is 66.5%, SVI is 32.2mL / gMLSS; total EPS in sludge The amount was 22.2mg / gVSS, and...

Embodiment 2

[0015] The inoculum sludge was taken from the surplus sludge of Lucun Sewage Treatment Plant in Wuxi City, Jiangsu Province, and was domesticated and cultured for two weeks. The influent COD concentration is 632.5mg / L, the ammonia nitrogen concentration is 20.1mg / L, and the pH value is 7.5; the hydraulic retention time is 12h, of which the water inflow is 5min, the aeration is 680min, the settlement is 30min, and the water outlet is 5min; no sludge is discharged during operation. The results show that the COD of the effluent of the MBR system is 6.9mg / L, and the concentration of ammonia nitrogen is 0.1mg / L, which meets the first-class A standard in the national urban sewage treatment plant pollutant discharge standard (GB 18918-2002) and urban sewage recycling-urban Miscellaneous water quality standard (GB / T 18920-2002); MLSS in MBR is 8.4g / L, VSS is 4.7g / L; relative hydrophobicity of sludge is 82.5%, SVI is 38.1mL / gMLSS; total EPS in sludge The amount was 21.3mg / gVSS, and the...

Embodiment 3

[0017] The inoculum sludge was taken from the surplus sludge of Lucun Sewage Treatment Plant in Wuxi City, Jiangsu Province, and was domesticated and cultured for two weeks. The influent COD concentration is 712.4mg / L, the ammonia nitrogen concentration is 30.6mg / L, and the pH value is 7.5; the hydraulic retention time is 12h, of which the water inflow is 5min, the aeration is 680min, the settlement is 30min, and the water outlet is 5min; no sludge is discharged during operation. The results show that the COD of the effluent of the MBR system is 34.7mg / L, which meets the first-class A standard in the national urban sewage treatment plant pollutant discharge standard (GB 18918-2002) and the urban sewage recycling-urban miscellaneous water quality standard (GB / T 18920-2002); MLSS in MBR is 13.0g / L, VSS is 10.4g / L; sludge relative hydrophobicity is 78.5%, SVI is 40.7mL / gMLSS; total amount of EPS in sludge is 19.3mg / gVSS, cell The ratio of exoprotein to polysaccharide was 0.12.

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Abstract

A method for regulating and controlling sludge quality in membrane bioreactor belongs to the technical field of biological treatment for waste water. In the invention, simulation waste water is taken as treating object, the EPS content in the sludge is regulated and controlled by sequencing batch operation instead of continuous operation of the traditional MBR process so as to change settlement performance and hydrophobicity of the sludge and delay membrane pollution. The water discharged by the MBR system arrives at first-level A standard of pollutant discharge standard of the national town sewage treatment plant and quality standard for city sewage recycling-city water use; the suspended solid concentration MLSS in the mixed liquid in the MBR is 8.4-13.0 g / L; the volatile solid concentration VSS is 4.7-10.4 g / L; the relative hydrophobicity of the sludge is 66.5-88.6%; the sludge volume index SVI is 32.2-40.7 mL / gMLSS; and the total weight of ecto-polymer of sludge EPS is 19.3-26.5 mg / gVSS. The method has simple operation, low operation cost, good stability, low residual sludge yield, good water quality and high theoretical value, thereby being capable of being applied in engineering practice.

Description

technical field [0001] A new method for regulating the properties of sludge in a membrane bioreactor (Membrane Bioreactor, MBR), relates to a method for regulating the sedimentation and hydrophobic properties of the sludge by changing the operation mode of the MBR, and belongs to the technical field of wastewater biological treatment. Background technique [0002] The MBR technology, which is a combination of membrane separation technology and biological treatment process, has a research history of more than 30 years and its commercial application for more than 20 years. In 1969, the Dorr-Oliver Company of the United States combined the activated sludge process and the ultrafiltration process for the first time to treat urban sewage. The secondary sedimentation tank uses membrane separation to enrich microorganisms, instead of using conventional backflow to increase the concentration of microorganisms in the aeration tank. In 1972, Shelf and others applied membrane separati...

Claims

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Application Information

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IPC IPC(8): C02F3/30
Inventor 李秀芬王新华陶丽佳
Owner JIANGNAN UNIV
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