Method for realizing synchronous denitrification in membrane bioreactor

A membrane bioreactor and denitrification technology, applied in the field of wastewater biological treatment, can solve problems such as ineffective effects, and achieve the effects of avoiding slow start, fast start, and sufficient theoretical basis

Inactive Publication Date: 2010-05-12
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The earliest Anammox reactors were biofilm reactors, such as fixed bed, fluidized bed, and airlift reactors. Sequencing batch reactors and upflow anaerobic sludge bed reactors were also used, but the effects were not obvious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 68mg / L, NO 2 - -N (as NaNO 2 The concentration is 70mg / L; the pH value is 6.5, the temperature is 25°C, and the rising flow rate is 1.8m / h; semi-continuous operation, one operation cycle is 24h, including 1.0h of water inflow, 22.5h of circulation, and 0.2 of rest. h, effluent 0.3h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 87d; the sludge concentration in the reactor was 12.7g / L, and the Anammox activity in the sludge was 0.19kg / (m 3 d), the color of the sludge changed from black to reddish brown; the total nitrogen removal rate was 82%, NH 4 + -N removal rate is 92%, NO 2 - -N removal rate is 92%; stable operating membrane flux is 5.8L / (m 2 h).

Embodiment 2

[0015] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 72mg / L, NO 2 - -N (as NaNO 2 The concentration is 73mg / L; the pH value is 7.5, the temperature is 35°C, and the rising flow rate is 2.3m / h; semi-continuous operation, one operation cycle is 6h, in which the water inlet is 0.5h, the circulation is 5h, and the static is 0.4h. , effluent 0.1h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 70d; the sludge concentration in the reactor was 13.5g / L, and the Anammox activity in the sludge was 0.15kg / (m 3 d), the color of the sludge changed from black to reddish-brown; the total nitrogen removal rate was 69%, NH 4 + -N removal rate is 79%, NO 2 - -N removal rate is 65%; stable operating membrane flux is 4.6L / (m 2 h).

Embodiment 3

[0017] The inoculated sludge was taken from the anaerobic granular sludge of the wastewater treatment reactor of the Wuxi Citric Acid Plant. NH 4 + -N (in NH 4 Add in the form of Cl) concentration is 73mg / L, NO 2 - -N (as NaNO 2 The concentration is 98mg / L; the pH value is 8.0, the temperature is 30°C, and the rising flow rate is 3.0m / h; semi-continuous operation, one operation cycle is 12h, in which the water inlet is 0.5h, the circulation is 11h, and the rest is 0.4h. , effluent 0.1h; no sludge discharge during operation. The results showed that the start-up time of the reactor was 81d; the sludge concentration in the reactor was 14.8g / L, and the Anammox activity in the sludge was 0.12kg / (m 3 d), the color of the sludge changed from black to reddish brown; the total nitrogen removal rate was 63%, NH 4 + -N removal rate is 65%, NO 2 - -N removal rate is 73%; stable operating membrane flux is 3.2L / (m 2 h).

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Abstract

The invention relates to a method for realizing synchronous denitrification in a membrane bioreactor, which belongs to the technical field of biological wastewater treatment. In the method, high ammonia nitrogen ratio wastewater or low carbon nitrogen ratio wastewater is used as a treatment object, slow-growing anaerobic ammonium oxidation (anammox) bacteria are cultivated in an external MBR, the loss of sludge with effluent is prevented to a maximum degree, the starting time is shortened, corresponding operating parameters are provided; the starting time of the bioreactor can be shortened to 87days, the sludge concentration of an anammox denitrification process in the external MBR is up to 12.7 to 14.8 g/L, the sludge color is changed into red brown from black, the total nitrogen removal rate is between 50 and 82 percent, the NH4<+>-N removal rate is between 46 and 92 percent, the NO2<->-N removal rate is between 63 and 92 percent and the membrane flux of stable operation is between 2.5 to 5.8 L/(m2.h). The method has less investment, low operating cost, high stability, low yield of residual sludge, superior effluent quality and a high theoretical value and can be applied in engineering practice.

Description

technical field [0001] A method for realizing synchronous denitrification in a membrane bioreactor (Membrane Bioreactor, MBR), which relates to a high ammonia nitrogen or low carbon nitrogen ratio wastewater in the MBR to carry out anaerobic ammonium oxidation (ANaerobic AMMonium OXidation, Anammox) process startup and The research on operating conditions belongs to the technical field of wastewater biological treatment. Background technique [0002] For the removal of ammonia nitrogen pollution in industrial and domestic sewage, the traditional method is to use a biological method that combines nitrification and denitrification. This method is suitable for the treatment of sewage with abundant biochemically usable carbon sources, but it has poor biochemical properties or high ammonia nitrogen concentration. High or low carbon nitrogen ratio sewage, such as landfill leachate and sludge digestion effluent from sewage treatment plants, in order to ensure a high nitrogen remova...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
Inventor 李秀芬华兆哲谈玉琴
Owner JIANGNAN UNIV
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