The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed ...The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed by using gross organic parameters such as chemical oxygen demand(COD),total organic carbon(TOC),UV254 and COD/TOC molar ratio during the treatment with Fenton reagent.The results demonstrated that the humic substances removal efficiency(from 11.9% to 89.5%) was higher than that of COD(from 9.6% to 75.2%) and there was a good correlation between humic substances degradation and COD removal.This study showed that the oxidation efficiency controlled the coagulation efficiency,so high oxidation efficiency may cause relatively low coagulation.The change of(COD/TOC)oxid indicated that the oxidation reaction was ultimate degradation under the condition of pH= 2.0—4.0,>80 mmol·L-1,= 40—160 mmol·L-1,reaction time 2 h.The changes of(COD/TOC)coag illustrated that the oxidation state of the organic matter removed by coagulation was significantly higher than in the fresh landfill leachate under the above reaction conditions.展开更多
研究了Fenton试剂法强化铁炭微电解工艺对高浓度难生化有机废水的预处理效果。结果表明,当原水COD在9 000 mg/L、铁炭微电解反应时间为100 m in、pH值为2.2时,铁炭微电解对原水COD的去除率>45%;铁炭微电解出水再投加240 mg/L的H2O2(3...研究了Fenton试剂法强化铁炭微电解工艺对高浓度难生化有机废水的预处理效果。结果表明,当原水COD在9 000 mg/L、铁炭微电解反应时间为100 m in、pH值为2.2时,铁炭微电解对原水COD的去除率>45%;铁炭微电解出水再投加240 mg/L的H2O2(30%)进行Fenton试剂法处理,常温下反应50 m in对原水COD的去除率可提高到75%以上。铁炭微电解+Fenton试剂联合工艺的除污效果好、运行稳定、成本低廉,适宜对高浓度难生化有机废水的预处理。展开更多
文摘The experiments focused on the Fenton treatment of humic substances(HS) in concentrated landfill leachate rejected by reverse osmosis(RO).The changes in dissolved organic matter by oxidation/coagulation were assessed by using gross organic parameters such as chemical oxygen demand(COD),total organic carbon(TOC),UV254 and COD/TOC molar ratio during the treatment with Fenton reagent.The results demonstrated that the humic substances removal efficiency(from 11.9% to 89.5%) was higher than that of COD(from 9.6% to 75.2%) and there was a good correlation between humic substances degradation and COD removal.This study showed that the oxidation efficiency controlled the coagulation efficiency,so high oxidation efficiency may cause relatively low coagulation.The change of(COD/TOC)oxid indicated that the oxidation reaction was ultimate degradation under the condition of pH= 2.0—4.0,>80 mmol·L-1,= 40—160 mmol·L-1,reaction time 2 h.The changes of(COD/TOC)coag illustrated that the oxidation state of the organic matter removed by coagulation was significantly higher than in the fresh landfill leachate under the above reaction conditions.
文摘研究了Fenton试剂法强化铁炭微电解工艺对高浓度难生化有机废水的预处理效果。结果表明,当原水COD在9 000 mg/L、铁炭微电解反应时间为100 m in、pH值为2.2时,铁炭微电解对原水COD的去除率>45%;铁炭微电解出水再投加240 mg/L的H2O2(30%)进行Fenton试剂法处理,常温下反应50 m in对原水COD的去除率可提高到75%以上。铁炭微电解+Fenton试剂联合工艺的除污效果好、运行稳定、成本低廉,适宜对高浓度难生化有机废水的预处理。