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Method of inhibiting membrane contamination of membrane bioreactor

A technology of membrane bioreactor and membrane inhibition, applied in chemical instruments and methods, biological water/sewage treatment, sustainable biological treatment, etc., to avoid trouble and secondary pollution, have sufficient theoretical basis, and inhibit membrane fouling

Inactive Publication Date: 2007-06-06
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, domestic and foreign theoretical and practical studies have shown that membrane fouling has and will continue to restrict the further advancement of research on membrane bioreactor technology at the basic and application levels.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Inoculation of aerobic flocculent activated sludge. Membrane bioreactor feed water is simulated domestic sewage, and the water quality is as follows: COD concentration is 200mg / L, ammonia nitrogen is 15mg / L, pH value is 6.8, dissolved oxygen concentration is 2.0mg / L, hydraulic retention time is 4h, sludge retention time for 5 days. When it runs to about 30 days, it can be found that there is aerobic granular sludge in the membrane bioreactor by visual inspection. Under the same experimental conditions as the control example, the membrane flux is 15-20L / m 2 h.

Embodiment 2

[0014] Inoculation of aerobic flocculent activated sludge. Membrane bioreactor feed water is simulated domestic sewage, and the water quality is as follows: COD concentration is 500mg / L, ammonia nitrogen is 50mg / L, pH value is 7.5, dissolved oxygen concentration is 4.0mg / L, hydraulic retention time is 7h, sludge retention time for 7 days. When it runs to about 25 days, it can be observed with the naked eye that there is aerobic granular sludge in the membrane bioreactor. Under the same experimental conditions as the control example, the membrane flux is 15-20L / m 2 h.

Embodiment 3

[0016] Inoculation with aerobic granular sludge. Membrane bioreactor feed water is simulated domestic sewage, and the water quality is as follows: COD concentration is 1000mg / L, ammonia nitrogen is 100mg / L, pH value is 8.0, dissolved oxygen concentration is 6.0mg / L, hydraulic retention time is 10h, sludge retention time for 10 days. The physical and chemical properties of aerobic granular sludge can be maintained in membrane bioreactors. Under the same experimental conditions as the control example, the membrane flux is 15-20L / m 2 h.

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Abstract

The present invention is method of inhibiting membrane contamination in membrane bioreactor, and belongs to the field of biological waste water treating technology. In traditional membrane bioreactor, aerobic granular sludge is cultured or inoculated to increase sludge grain size or change sludge form, so as to inhibit membrane contamination. By using simulated domestic sewage as the incoming water of membrane bioreactor and aerobic flocculent sludge or aerobic granular sludge as inoculated sludge, the present invention alters the running environment condition of traditional membrane bioreactor to change the sludge grain size and form in membrane bioreactor, maintain the physical and chemical characteristics of inoculated aerobic granular sludge, and reduce or eliminate the adverse effect of the membrane contamination. The present invention is simple and efficient, and may be used in engineering.

Description

technical field [0001] A method for inhibiting membrane fouling in a membrane bioreactor relates to a new method for inhibiting membrane fouling by cultivating or inoculating aerobic granular sludge in a membrane bioreactor, and belongs to the technical field of wastewater biological treatment. Background technique [0002] According to the Bulletin on the State of Water Environment in my country, in 2005, the total discharge of wastewater in the country was 52.45 billion tons, of which the discharge of industrial wastewater was 24.31 billion tons, and the discharge of domestic sewage was 28.14 billion tons. In the 21st century, my country will experience unprecedented water pollution and water resources. The test of the shortage problem. On the other hand, "my country's environmental biotechnology development strategy report" (2005) clearly pointed out that in the biological treatment technology of industrial and domestic wastewater, the new technology research of membrane b...

Claims

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Application Information

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IPC IPC(8): C02F3/10C02F3/12
CPCY02W10/10
Inventor 陈坚李秀芬李延军堵国成刘和
Owner JIANGNAN UNIV
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