Abstract:

Coagulation+iron-carbon microelectrolysis/H₂O₂+activated carbon process has been used for the combined treatment of high-concentration chemical cleaning wastewater. Its reaction mechanism and influencing factors are analyzed. The following optimal coagulation conditions are decided via experiments：pH is 8，PAC dosage 50 mg/L，PAM dosage 2 mg/L，and settling time 40 min. The optimal conditions for iron-carbon microelectrolysis/H2O2 are as follows：pH is 2，Fe+C total dosage 60 g/L，m(Fe)∶m(C) 1∶1，H2O2 dosage 4 mL/L，and reaction time 60 min. The optimal conditions for activated carbon adsorption are as follows：adsorption time is 120 min，pH 6，and activated carbon dosage 20 g/L. The results show that the COD removing rate can be above 98%，meeting the requirements of the first class of Integrated Wastewater Discharge Standard（GB 8978—1996) under the above optimal conditions.

Key words: coagulation, iron-carbon microelectrolysis, activated carbon, chemical cleaning wastewater

摘要：

利用混凝+铁炭微电解/H2O2+活性炭吸附法对高浓度的化学清洗废水进行联合处理,同时简单分析了反应机理及影响因素。通过实验确定了混凝最佳条件(pH=8、PAC投加量为50 mg/L、PAM投加量2 mg/L、沉淀时间40 min),铁炭微电解/H2O2最佳条件〔pH=2、(Fe+C)总投加量60 g/L、m(Fe)∶m(C)为1∶1、H₂O₂投加量4 mL/L、反应时间60 min〕,活性炭吸附最佳条件(吸附时间120 min、pH=6、活性炭投加量20 g/L)。结果表明,在上述最佳工艺条件下对化学清洗废水进行处理,COD去除率可达98%以上,达到国家一级排放标准(GB 8978—1996)要求。

关键词: 混凝, 铁炭微电解, 活性炭, 化学清洗废水

CLC Number: 

• X703