絮凝-酸析-NaClO-Fenton联合处理页岩气产出水  

Combined Treatment of Shale Gas Produced Water by Flocculation-Acidification-NaClO-Fenton

作　　者：王田丽 杨阳[1,2] 韩霞 Wang Tianli;Yang Yang;Han Xia(Shandong Provincial Key Laboratory of Oilfield Produced Water Treatment and Environmental Pollution Control;SINOPEC Petroleum Engineering Corporation)

机构地区：[1]山东省油田采出水处理及环境污染治理重点实验室 [2]中石化石油工程设计有限公司

出　　处：《油气田环境保护》2023年第1期28-32,40,共6页Environmental Protection of Oil & Gas Fields

摘　　要：以涪陵页岩气田产出水为对象,研究絮凝、酸析、次氯酸钠(NaClO)和Fenton氧化联合处理产出水COD的去除规律,考察了絮凝剂、NaClO、Fenton试剂的加量以及体系pH值对去除率的影响。研究结果表明:单纯絮凝或酸析处理的COD去除率<25%,絮凝-酸析处理COD去除率>40%;絮凝-酸析后再进行NaClO氧化最高COD去除率为80.34%,比原始水样直接NaClO氧化提高了5.33%,对NaClO的需求量低于直接NaClO氧化,并能达到相同的COD去除效果;絮凝-酸析后水样进行Fenton氧化与原始水样直接Fenton氧化相比,COD去除率提高了6.07%;絮凝-酸析-NaClO-Fenton联合处理COD去除率>90%,最高为94.17%,比絮凝-酸析-NaClO和絮凝-酸析-Fenton分别提高了13.83%和5.27%。页岩气产出水经絮凝-酸析预处理,能达到削减后续NaClO和Fenton氧化负荷、降低药剂用量的目的,再经过Fenton试剂和NaClO对不同类型特征污染物选择性去除的联合作用,可达到较高的COD去除率。Taking produced water from Fuling shale gas field as the research object, the COD removal rules of produced water from combined treatment of flocculation, acidification, NaClO and Fenton oxidation were studied. The effects of the dosage of flocculant, NaClO and Fenton reagent as well as pH value of the system on the removal rate were investigated.The results indicated that COD removal rate of flocculation or acidification treatment was less than 25%,and combined flocculation with acidification treatment was more than 40%. The maximum COD removal rate of NaClO oxidation after flocculation-acidification was 80.34%,which was increased by 5.33% compared with single NaClO oxidation of the original water sample. Moreover, Under the same COD removal effect achieved, the demand for NaClO was lower than that for single NaClO oxidation. The COD removal rate of Fenton oxidation after flocculation-acidification was increased by 6.07% compared with single Fenton oxidation of the original water sample. The COD removal rate of flocculation-acidification-NaClO-Fenton combined treatment was more than 90%,and the highest removal rate was 94.17%,which was increased by 13.83% and 5.27% compared with flocculation-acidification-NaClO and flocculation-acidification-Fenton, respectively. After the produced water from shale gas was treated by flocculation-acidification, it could reduce the load of N NaClO and Fenton oxidation and the dosage of reagent. Then, the high COD removal rate could be achieved by combined effect of Fenton reagent and NaClO on the selective removal for different types of characteristic pollutants.

关 键 词：页岩气产出水 COD 絮凝 酸析 NACLO FENTON 

分 类 号：X741[环境科学与工程—环境工程]