求翻译：本文采用混凝沉淀法，通过向采油废水中加入净水剂聚硫酸铝、助沉剂聚丙烯酰胺和合适的脱色剂来降低废水中COD指标。是什么意思？

In this paper, coagulating sedimentation method , by adding water to oil purifying agent poly aluminum sulfate polyacrylamide and co- settling agent suitable bleaching agent to reduce the wastewater COD indicators.

This document a hybrid gel deposition (PVD) and through the oil in the wastewater to water-purification chemicals together aluminum sulphate, to sink, Polyacrylamine and suitable bleaching agents to reduce waste water, in COD indicators.

This article uses the coagulation precipitation method, through joins the purifying agent to the extraction waste water in to gather the aluminium sulfate, helps sinks the medicinal preparation polyacrylamide and the appropriate decolorant reduces in the waste water the COD target.

Using coagulation, by adding water into the oil extraction wastewater poly alum, a sink supporting agent, Pam and indicators of suitable bleaching agents to reduce COD in waste water.

正在翻译，请等待...