应用于垃圾渗滤液预处理工艺的研究

Research on the pretreatment processes of landfill leachate

针对垃圾渗滤液高COD、高氨氮的特征,选用了混凝沉淀、Fenton氧化、蒸发及其组合工艺对垃圾渗滤液进行预处理,通过单因素试验,探讨了各工艺的最佳运行条件。试验结果表明,采用混凝沉淀法时,PAFC最佳投加量为30 mg/L,PAM最佳投加量为4 mg/L;采用Fenton氧化法时,H2O2最佳投加量为1.5‰,H2O2∶Fe2+最佳质量比为10∶3;垃圾渗滤液的最佳预处理工艺为混凝沉淀+Fenton氧化+蒸发,此时COD,NH4-N+的去除率分别为91.22%,86.73%,为后续生化处理提供了良好的反应条件。

Coagulation precipitation, Fenton oxidation, evaporation and their combination processes were selected for the landfill leachate pretreatment according to the characteristics of high COD and high ammonia nitrogen of landfill leaehate. And the optimal operating conditions for each process were explored through single-factor tests. The results show that the optimal dosage of PAFC is 30 mg/L and the optimal dosage of PAM is 4 mg/L when using the coagulation precipitation method; the optimal dosage of H2O2 is 1.5‰ and the optimal mass ratio of H2 02： Fe2＋ s 10：3 when using the Fenton oxidation method; the best pretreatment process of landfill leaehate is coagulation precipitation ＋ Fenton oxidation ＋ evaporation, and the removal rates of COD and NH4-N ＋ were 91.22% and 86.73% respectively, which provided good reaction conditions for subsequent bioehenfieal treatment.