铁炭微电解预处理电路板废水

Pretreatment of printed circuit board wastewater by iron-carbon microelectrolysis

采用铁炭微电解法预处理电路板废水。结果表明,在进水pH为2.00、铁炭质量比为4∶1、振荡时间为20 min的铁炭微电解静态实验最佳条件下,絮凝出水COD去除率为30%;在进水pH为2.00、铁炭质量比为4∶1、水力停留时间为50 min的铁炭微电解柱动态实验最佳条件下,连续曝气,絮凝出水COD为11021 mg/L,COD去除率约为34%,BOD5/COD从0.12上升到0.32,可生化性提高,Cu2+质量浓度从9.11 mg/L下降至0.76 mg/L,降低了废水的生物毒性,为生化处理创造了条件。

Pretreatment of the circuit board wastewater by iron-carbon microelectrolysis was studied. Under the most effeetive batch Fe/C microelectrolysis conditions （pH ： 2.00, Fe/C mass ratio= 4 ; 1, stirring time= 20 min） followed by aeration and lime neutralization/coagulation/flocculation to remove the iron hydroxide floes, up to 30% of COD was removed. Employing a packed Fe/C column with an hydroli retention time （HRT） of 50 min, the Fe/C mieroeleetrolysis （pH=2.00, Fe/C mass ratio ： 4 ： 1）, aeration and lime neutralization/coagulation pretreatment aecomplished 34% of COD removal; it also removed most of Cu^2＋ （from 9. 11 mg/L to 0. 76 mg/L） making the wastewater much more biodegradable （BOD5/COD rose from 0.12 to 0.32）. Even better pretreatment results could be obtained if more reaction time was available.