Electrochemical combined process for treatment of landfill leachate MBR effluent
In this paper, the effects of treatment of landfill leachate MBR effluent by electrochemical combined process was studied. The electrochemical system consisting of Nb/BDD electrode and 6 different coated titanium substrate electrode as anode and stainless steel as cathode were used separately to compare the effect of COD degradation. The BDD electrode had the fastest electrolysis speed when the current density was 25 mA/cm2 and the initial pH was 8. 01. The COD removal rate was up to 86. 6％ after 3 hours of electrolysis. The removal rate of titanium substrate electrode plate B and electrode plate A was up to 78％ after 5 hours of electrolysis. The removal rate of ammonia nitrogen was up to 98. 3％ after 4 hours of electrolysis for electrode plate B and the degradation rate of ammonia nitrogen was accelerated with the content of active chlorine increased under alkaline condition. After electrolyzing MBR effluent by DSA for 2. 5 hours, then added electronating agent to continue biochemical treatment for 4 hours and the COD reached standard discharge. The results of infrared spectrum showed that MBR effluent contained a large amount of refractroy substances such as phenol and alcohol, which caused COD fluctuates greatly during titanium substrate electrode plate electrolysis process. The MBR effluent can achieve standard discharge by applying DSA electrolysis, adding electronating agent and supplementing with microbial advanced treatment.
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