污水处理药剂对含油污泥产生量的影响

Influence of sewage treatment agents on the production of oily sludge

目的分析污水处理药剂对含油污泥产生量的影响,为实际油气田含油污泥减控工作提供参考。方法开展污水处理药剂贡献率实验研究,初步确定药剂产泥的规律,理论估算新疆油田典型4座场站污水处理药剂产泥量,并针对A场站污水处理药剂添加量进行优化。结果污水处理药剂会产生一定量的污泥,其中,除硅剂贡献率(47.95%)、净水剂(PAC)贡献率(20.00%~31.00%)远大于絮凝剂(PAM)贡献率(3.00%~8.00%),是污水处理药剂产泥的主要来源;不同药剂添加量的优化采用控制变量法进行,推荐A场站优化措施为PAC和PAM的添加量分别为250 mg/L、10 mg/L。结论量化分析了采油污水处理药剂的产泥率,综合考虑污水处理药剂成本和药剂产泥率,可用于指导药剂优选。

Objective The aim of this study is to improve the understanding upon the role of individual chemical on the production of oily sludge and provide a reference for the reduction and control of oily sludge in oil and gas field.Methods The study was carried out to preliminarily identify the contribution rate of wastewater treatment chemicals in sludge and their production pattern.Furthermore,sludge production rates in 4 typical stations of Xinjiang Oilfield were estimated theoretically,and the dosages of wastewater treatment chemicals in Station A were optimized.Results The study showed that wastewater treatment chemicals would produce a certain amount of sludge,of which the contribution rates of desiliconizing agent(47.95%)and water purifying agent(PAC)(20.00%-31.00%)were far greater than the contribution rate of flocculant(PAM)(3.00%-8.00%),which were the main sources of sludge contributed by wastewater treatment chemicals;The control variable method was subsequently adopted to optimize the dosage of various reagents.The recommended dosages for Station A were 250 mg/L of PAC and 10 mg/L of PAM.Conclusions Considering the costs of wastewater treatment chemicals and their sludge yield,the quantitative analysis of the sludge yield of treatment chemicals for oil produced water could guide the optimization of chemicals selection.