原水水质对南方某给水厂处理有机氯农药效果的影响

采用HLB柱固相萃取样品前处理技术和气相色谱仪／电子捕获检测器(GC／ECD)分析方法,研究了东江-深圳供水改造工程竣工前后原水改变对给水厂处理有机氯农药效果的影响。结果表明:原水更换前后不同工艺段出水中共检出10种有机氯农药,浓度为0.08~20.68 ng／L,主要是HCBs,DDXs,氯丹和硫丹,远低于《国家地表水环境质量标准》(GB 3838-2002)及《生活饮用水卫生规范》规定的限值,不必对此进行长期连续监测。通过原水改变前后传统处理工艺对有机氯农药去除效果的对比发现,当原水中有机氯农药降低到一定程度后,常规饮用水处理工艺并无明显处理效果。

The effect of raw water quality on the removal efficiency of organochlorine pesticides in a waterworks in South China

Water samples were collected from different treatment processes of a waterworks in South China before and after applying the Dongshen water supply modification works. Organochlorine pesticides (OCPs) residues were assessed to evaluate the effect of raw water quality on the removal efficiency of OCPs. Water samples were extracted by Oasis HLB cartridges and then analyzed by gas chromatography equipped with an electron-capture detector (GC/ECD). Results showed that 10 OCPs had been detected altogether in the samples of different treatment processes at different sampling occasions, with concentrations ranged from 0.08 ng/L to 20. 68 ng/L, mainly including HCBs, DDXs, Chlordanes and Endosulfans. The corresponding concentration was under the specified standards defined in Environmental quality standard for surface water (GB 3838-2002) and Sanitary standard for drinking water quality. It is needless to monitor the OCPs concentration in a long time continuously. After comparison it was obvious that OCPs could not be removed efficiently in conventional treatment process when the concentration of OCPs in the water was lowered to some extent.