Method for treating landfill leachate with aerobic granular sludge membrane and its membrane bioreactor

Abstract

The invention discloses a method for treating landfill leachate by using an aerobic granular sludge membrane. Common activated sludge is used as inoculation sludge and placed in a reactor for cultivation. The simulated sewage is firstly used to wash out flocculent sludge with poor settling property. The granulation of the sludge was realized in a short time; then the granular sludge in the reactor was domesticated by gradually increasing the ratio of simulated sewage and landfill leachate, so that the particle size of the granular sludge was 2.2-2.7mm and a fixed solid state was formed inside. The biological community, the pollutant removal performance is stable, the impact load resistance is enhanced, and it is fully suitable for the treatment of landfill leachate; the present invention also provides a membrane bioreactor for the method of using aerobic granular sludge membrane to treat landfill leachate, providing The dissolved oxygen required for microbial metabolism and the formation of hydraulic shear force to maintain the formation of granular sludge make the removal rate of pollutants very stable. The removal rates of COD, ammonia nitrogen, TN, and TP in high-concentration organic landfill leachate are as high as 91% respectively. %, 93%, 92%, 91.3%.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating high-concentration organic wastewater such as landfill leachate, which can effectively improve the quality of treated effluent, reduce floor space, simple operation, and reduce treatment costs, and a membrane bioreaction used in the method device. Background technique [0002] Landfill leachate has high ammonia nitrogen, low C / N (carbon-to-nitrogen ratio) value, and heavy metal pollutants. Landfill leachate has extremely low biodegradability and is difficult to be degraded by microorganisms, so it will cause serious harm to the water environment. Traditional treatment methods include physical and chemical methods and biological methods; physical and chemical methods mainly include advanced oxidation methods, coagulation sedimentation, adsorption methods and membrane treatment technologies, but the cost is high and it is easy to cause secondary...

AI Technical Summary

Problems solved by technology

[0002] Landfill leachate has high ammonia nitrogen, low C / N (carbon-to-nitrogen ratio) value, and heavy metal pollutants. Landfill leachate has extremely low biodegradability and is difficult to be degraded by microorganisms, so it will cause serious harm to the water environment.

Traditional treatment methods include physical and chemical methods and biological methods; physical and chemical methods mainly include advanced oxidation methods, coagulation sedimentation, adsorption methods and membrane treatment technologies, but the cost is high and it is easy to cause secondary pollution; biological methods are due to the high concentration of ammonia nitrogen in landfill leachate And the characteristics of high content of heavy metal pollutants, so that the physiological activities of microorganisms are reversed, and the degradation performance of pollutants is reduced

[0003] The existing landfill leachate treatment method is usually the traditional activated sludge treatment process. The traditional activated sludge MBR and treatment methods have no synchronous denitrification and phosphorus removal effect, and the impact resistance is poor. Severe membrane fouling increases the cost of landfill leachate treatment. cost

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