Effect of Temperature on Removal of Ammonia Nitrogen in Biochemical Treatment of Landfill Leachate
In order to solve the problem of activated sludge deactivation and effluent ammonia nitrogen not up to standard caused by high temperature in summer in landfill leachate treatment project,the landfill leachate and activated sludge from a waste transfer station in Hangzhou was used to explore the effect of temperature on the removal of ammonia nitrogen from landfill leachate during biochemical treatment.And we obtained the following conclusions:under high temperature in summer,the removal efficiency of ammonia nitrogen in landfill leachate by activated sludge gradually decreases with the increase of temperature;When the temperature of the biochemical system is less than 40 ℃,the activity of the sludge could be restored by simple cooling measures;When the activated sludge is damaged by high temperature above 40 ℃,its biofilm structure is destroyed and completely inactivated,and the removal rate of ammonia nitrogen decreases to less than 20%.At this time,simple cooling measures cannot effectively restore activity,and it is necessary to re-inoculate the sludge or add nitrifying bacteria to achieve rapid recovery of ammonia nitrogen removal function.Therefore,in the landfill leachate treatment project,some measures should be taken to avoid aerobic activated sludge in high temperature environment above 40℃,such as setting cooling tower.
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