微藻处理压裂返排液的效果及影响因素  

Effect and Influence Factors of Microalgae for Fracturing Flowback Fluid Treatment

作　　者：李冉[1,2] 潘杰 张丽[1] 谢娟[3] 杨江[1] 秦文龙[1] LI Ran;PAN Jie;ZHANG Li;XIE Juan;YANG Jiang;QIN Wenlong(College of Petroleum Engineering,Xi'an Shiyou University,Xi'an 710065,China;Shaanxi Key Laboratory of A dvaneed Stimulation Technology for Oil & Gos Reservoirs,Xi'an Shiyou University,Xi'an 710065,China;College of Chemistry and Chemical Engineering,Xi'an Shiyou University,Xi'an 710065,China)

机构地区：[1]西安石油大学石油工程学院 [2]西安石油大学陕西省油气田特种增产技术重点实验室 [3]西安石油大学化学化工学院,陕西西安710065

出　　处：《水处理技术》2019年第2期72-75,共4页Technology of Water Treatment

基　　金：国家自然科学基金项目(51504192);陕西省自然科学基础研究计划项目(2016JQ5102);陕西省教育厅专项科研计划项目(17JK0616);陕西省高校科协青年人才托举计划项目(20160119)

摘　　要：针对压裂返排液污染物成分复杂、含量高,对环境污染严重的特点,采用小球藻好氧处理结合聚合氯化铝(PAC)混凝、颗粒污泥厌氧处理压裂返排液结果表明,压裂返排液可生化性差,小球藻直接处理返排液COD去除率仅为5.85%,返排液培养小球藻96 h后藻株进入对数期增殖,最大藻密度为1.19 g/L。混凝处理可以有效去除返排液中有机物污染物,混凝出水培养小球藻72 h后藻株进入对数期增殖,最大藻密度为1.03 g/L,返排液经混凝、小球藻处理后COD去除率为68.63%。颗粒污泥厌氧处理可以进一步去除返排液混凝出水有机污染物,厌氧出水培养小球藻24 h后藻株快速增殖,最大藻密度为0.35 g/L,返排液经混凝、厌氧和小球藻处理后,COD去除率可达92.16%。The fracturing flowback fluids contain complex pollutant components with high content, which cause serious environmental pollution. Chlorella aerobic combined with poly aluminium chloride(PAC) coagulation and granular sludge anaerobic were used to treat fracturing flowback fluid. The results showed that, the biodegradability of fracturing flowback fluid was bad, when the fracturing flowback fluid was treated directly by chlorella, COD removal rate was only 5.85%, chlorella turned into logarithmic phase from 96 h, and maximum algal density was 1.19 g/L. The coagulation treatment could remove organic pollutant in fracturing flowback fluid, chlorella in coagulation effluent turned into logarithmic phase from 72 h, and maximum algal density was 1.03 g/L. COD removal rate was 68.63% after coagulation and chlorella treatment. The granular sludge anaerobic treatment could further remove organic pollutant in coagulation treatment effluent. The chlorella proliferates quickly from 24 h, and maximum algal density was 0.35 g/L. COD removal rate could reach 92.16% after coagulation, granular sludge anaerobic and chlorella treatment.

关 键 词：小球藻 压裂返排液 生物处理 混凝 厌氧 

分 类 号：X741[环境科学与工程—环境工程]