用二级絮凝强化技术处理钻井污水研究

Drilling Sewage Disposal by Using Two-step Enhanced Chemical Flocculation Technology

絮凝沉降法是国内外普遍采用的钻井污水处理方法。对辽河油田的钻井污水采用二次絮凝处理工艺进行了实验。该油田钻井污水处理中选用CaCl2作为一级絮凝剂,利用离心强化固液分离法,污染物的脱除效率高,处理时间短。用二级絮凝强化技术处理钻井污水时采用了调质剂C和助凝剂D与絮凝剂PAC或LX复配,出水中铬的化学需氧量低于150mg/L,处理后的水质满足排放标准。

The flocculating setting method is useful for treating drilling sewage. The two-step coagulation and centrifuge methodology was adopted to treat drilling sewage produced in Liaohe Oilfield. The best conditions of coagulation and the optimal complex coagulating agent were determined. The results showed that the chemical oxygen demand of chromium in wastewater could be reduced to less than 150mg/L. The treated water samples conform to the GB8978-1996 sewage drainage standard. This methodology is feasible and economic and can be extensively applied.