安全、健康和环境2025，Vol.25Issue(12)：30-36,7.DOI:10.3969/j.issn.1672-7932.2025.12.005
预氧化-硬度调节-PAFS絮凝组合工艺处理低Ca2+/Mg2+油田产出污水研究
Treatment of Low Ca2+/Mg2+Oilfield Wastewater by the Combined Process of Pre-Oxidation-Hardness Adjustment-PAFS Flocculation
摘要
Abstract
The produced wastewater from the Da'erqi Oilfield exhibits complex ionic composition(high mineralization,low Ca2+/Mg2+),high suspended solids,and high oil content.To address the challenge that the original water treatment process is hard to make the effluent quality meet the reinjection standards,this study es-tablished the"pre-oxidation-hardness adjustment-PAFS flocculation"synergistic treatment system.By systemat-ically investigating the effects of key parameters,which include the addition concentrations of pre-oxidant(Na-ClO),hardness regulator(Ca(OH)2),and flocculant(PAFS),as well as reaction time on wastewater treat-ment efficiency,the optimal process conditions were determined.The experimental results showed that when 30 mg/L NaClO,80 mg/L Ca(OH)2,and 150 mg/L PAFS were added sequentially,and the flocculation reaction lasted for 60 minutes,the suspended solid concentration in the wastewater decreased from the initial 273 mg/L to 9.5 mg/L(removal rate of 96.5%).The oil content decreased from 89 mg/L to 8.4 mg/L(with a removal rate of 90.6%),achieving efficient removal of pollutants at low reagent concentrations.The treated water fully complies with SY/T 5329-2022 Grade II reinjection requirements..While ensuring that the water quality meets the standard,this technology effectively controls the treatment cost,providing an economically feasible so-lution for the treatment of produced wastewater with low Ca2+/Mg2+,high suspended solids,and high oil con-tent.关键词
低Ca2+/Mg2+污水/高悬浮物含油污水/组合工艺/污水处理/预氧化/硬度调节/絮凝沉淀Key words
low Ca2+/Mg2+wastewater/highly suspended oily wastewater/combination technology/sewage treatment/pre-oxidation/hardness adjustment/flocculation precipitation分类
资源环境引用本文复制引用
Wang Xiaoying..预氧化-硬度调节-PAFS絮凝组合工艺处理低Ca2+/Mg2+油田产出污水研究[J].安全、健康和环境,2025,25(12):30-36,7.基金项目
中国石化"十条龙"科技攻关项目(QDLY2304-04),陆相致密/页岩气地面工程及探评建一体化成本管控技术研究. （QDLY2304-04）
