Experimental Study on Treatment of Domestic Waste Leachate by Intensive Coagulation and Sedimentation Method
The combination of Fenton and flocculation treatment was used to treat the filtrate from a landfill in Guangdong.Different Fenton treatment conditions,including pH,H2O2/Fe(Ⅱ)ratio and dosage,and reaction time,were used to determine the optimal treatment process.Under the optimal Fenton treatment conditions,the COD removal rate was about 80%,and the influent mass concentration was 624±80 mg·L-1,which met the requirements of QCVN 25:2009/BTNMT.Meanwhile,75%of the color,25%of the ammonia and 12%of the suspended matter were removed,creating favorable conditions for the next stage of flocculation treatment.For flocculation,CaO and polymeric aluminum chloride(PAC)were used to sequentially treat the filtrate.After treatment with CaO(6 g·L-1 and 180 min),PAC(1 500 mg·L-1)and A101(2 mg·L-1),the removal rates of COD,color,ammonia and suspended matter reached 85%,99%,99%～99.5%and 88%,respectively,and the effluent could meet the treatment requirements of the discharge standard,and the toxicity analysis showed that both Fenton treatment reduced the toxicity of landfill leachate.
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