Petroleum Science >2013, Issue 1: 106-111 DOI: https://doi.org/10.1007/s12182-013-0256-7
Treatment of drilling wastewater from a sulfonated mud system Open Access
文章信息
作者：Guo Jixiang,Cui Yongjie and Cao Jingjing
作者单位：
Enhanced Oil Recovery Institute, China University of Petroleum, Beijing 102249, China;Shenghua Group Zhungeer Energy Co, Ltd, Inner Mongolia 010399, China;Enhanced Oil Recovery Institute, China University of Petroleum, Beijing 102249, China
投稿时间：2012-08-16
引用方式：Guo, J., Cui, Y. & Cao, J. Pet. Sci. (2013) 10: 106. https://doi.org/10.1007/s12182-013-0256-7
文章摘要
Treatment of drilling wastewater from a sulfonated drilling mud system in the Shengli
Oilfield, East China, was studied. The wastewater was deeply treated by a chemical coagulation–
centrifugal separation–ozone catalytic oxidation combined process. The factors (i.e. pH value, chemical
dosage, reaction time, etc.) influencing the treatment effect were investigated, and pH = 7 was determined
as optimal for the coagulation; polymeric aluminum chloride (PAC) was selected as the optimal coagulant
with a dosage of 18 g/L; cationic polyacrylamide (CPAM) with molecular weight of 8 million was
selected as the optimal coagulant aid with an optimum dosage of 8 mg/L; and the optimal condition of
catalytic ozonation was found to be a pH of 12 and an oxidation time of 40 min. The results showed
that the combined treatment process was effective. The oil content and suspended solids content of the
effluent reached the first class discharge standard according to China’s standard GB 8978-1996 (Integrated
Wastewater Discharge Standard) and the chemical oxygen demand (COD) decreased to 195 mg/L from
2.34×104 mg/L after coagulation process and ozone oxidation at pH = 12 for 40 min.
Oilfield, East China, was studied. The wastewater was deeply treated by a chemical coagulation–
centrifugal separation–ozone catalytic oxidation combined process. The factors (i.e. pH value, chemical
dosage, reaction time, etc.) influencing the treatment effect were investigated, and pH = 7 was determined
as optimal for the coagulation; polymeric aluminum chloride (PAC) was selected as the optimal coagulant
with a dosage of 18 g/L; cationic polyacrylamide (CPAM) with molecular weight of 8 million was
selected as the optimal coagulant aid with an optimum dosage of 8 mg/L; and the optimal condition of
catalytic ozonation was found to be a pH of 12 and an oxidation time of 40 min. The results showed
that the combined treatment process was effective. The oil content and suspended solids content of the
effluent reached the first class discharge standard according to China’s standard GB 8978-1996 (Integrated
Wastewater Discharge Standard) and the chemical oxygen demand (COD) decreased to 195 mg/L from
2.34×104 mg/L after coagulation process and ozone oxidation at pH = 12 for 40 min.
关键词
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Drilling wastewater, sulfonated mud system, coagulation and flocculation, centrifugal separation, ozone catalytic oxidation