摘要
为使处理后的气田水能达到国家二级排放标准,首先向模拟气田水中加入缓蚀剂CPI-W,考察缓蚀剂的添加对气田水中的COD影响,然后分别采用次氯酸钠法、芬顿试剂法和过硫酸钾-硫酸亚铁法处理添加了缓蚀剂CPI-W的模拟气田水,考察处理后水中的COD去除效果。结果表明,3种处理方法均能使加注1000 mg/L缓蚀剂的模拟气田水的COD值达到《污水综合排放标准》的二级排放标准(<150 mg/L)。采用次氯酸钠氧化法处理后,当次氯酸钠加量为8 mg/L时,COD去除率达94.4%;采用芬顿试剂法处理后,当H_(2)O_(2)加量为4 mg/L、FeSO_(4)·7H_(2)O加量为0.08 mg/L时,COD去除率达96.1%;而采用过硫酸钾-硫酸亚铁法处理后,K_(2)S_(2)O_(8)加量为8 mg/L、FeSO_(4)·7H_(2)O加量为4 mg/L时,COD去除率达97.4%。对比分析COD去除率以及药剂成本,3种高级氧化技术中过硫酸钾-硫酸亚铁法为降解气田废水中缓蚀剂的最优方法。
In order to make the treated gas field water meet the national secondary discharge standard,the corrosion inhibitor CPI-W was firstly added to the simulated gas field water to investigate the effect of corrosion inhibitor on chemical oxygen demand(COD)in gas field water,and then the simulated gas field water added with corrosion inhibitor CPI-W was treated by sodium hypochlorite method,Fenton's reagent method and potassium persulfate-ferrous sulfate method to investigate the COD removal effect,respectively.The results showed that all three treatment methods were able to achieve COD values of simulated gas field water spiked with 1000 mg/L corrosion inhibitor to meet the secondary discharge standard(<150 mg/L)of the comprehensive wastewater discharge standard.After treatment by sodium hypochlorite oxidation method,the COD removal rate reached 94.4%when the sodium hypochlorite dosage was 8 mg/L;after treatment by Fenton's reagent method,the COD removal rate reached 96.1%when the H_(2)O_(2) dosage was 4 mg/L and FeSO_(4)·7H_(2)O dosage was 0.08 mg/L;while after treatment by potassium persulfate-ferric sulfate method,the COD removal rate was 97.4%when K_(2)S_(2)O_(8) was added at 8 mg/L and FeSO_(4)·7H_(2)O was added at 4 mg/L.Comparing the COD removal rate and the cost of chemicals,the potassium persulfate-ferrous sulfate method was the best method to degrade the corrosion inhibitor in gas field wastewater among the three advanced oxidation techniques.
作者
张金钟
樊相汝
廖芸
张东贺
羊依金
ZHANG Jinzhong;FAN Xiangru;LIAO Yun;ZHANG Donghe;YANG Yijin(Southwest Branch of China Petroleum Engineering Company,Chengdu,Sichuan 610094,P R of China;College of Resource and Environment,Chengdu University of Information Technology,Chengdu,Sichuan 610225,P R of China)
出处
《油田化学》
CAS
CSCD
北大核心
2022年第1期121-125,共5页
Oilfield Chemistry
基金
中国石油“十三五”规划项目“页岩气地面工艺技术及高效设备研发”(项目编号KY2016-03)。
关键词
气田水
缓蚀剂
高级氧化技术
化学需氧量(COD)
gas field water
corrosion inhibitor
advanced oxidation technology
chemical oxygen demand(COD)
