摘要
报道了采用碱处理－氧化／吸附－混凝法处理油田酸化废水的一种工艺方法。实验用酸化废水取自河南油田，由剩余酸及酸化返排液组成，其CODcr=4367mg／L，由70．4％无机物和29．6％有机物构成。实验研究中以CODcr去除率为考察指标，所得药剂适宜加量和工艺参数如下：在碱处理阶段，Ca（OH）2加量100g／L，使废水pH由1．0升至11．5，CODcr去除率45．8％；在氧化阶段，H2O2溶液加量3mL／L，镀铜铁屑加量4g／L，pH值3～4；在吸附阶段，活性炭加量10g／L，pH值4～5，搅拌时间60min。进一步通过正交设计实验，求得氧化／口及附阶段最佳工艺条件为：pH：45，H2O2溶液加量3mL／L，镀铜铁屑加量4g／L，活性炭加量10g／L，搅拌时间80min。碱处理后废水经此氧化／吸附处理后，CODcr为315mg／L，再加入2．5g／LPAC混凝处理后，pH=7．5，CODcr为115mg／L，去除率达97．4％；悬浮固体由原废水的624mg／L降至4mg／L，含油由1．41mg／L降至0．4mg／L，色度由110mg／L降至6mg／L．CI^-由47341mg／L降至198mg／L。处理后废水达到国家二级排放标准。表7参5。
An alkalinization--oxidation/adsorptiozr--coagulation treating technology is suggested for hazardous reservoir acidizing wastewater （AWW）. The AWW sample is taken from Henan oil field and has CODcr= 4367 mg/L, which is composed of 70.4% inorganics and 29.6% organics. In the experimental study, the percentage removal （PR） of CODcr is taken as criterion and the prop- er dosages of chemical treating agents and the technologic parameters obtained are as follows. In alkalinization, proper dosage of Ca（OH）2 100 g/L, with which the pH of AWW rises from 1.0 to 11.5 and the CODcr, lowers by 45.8% ; in oxidation, proper dosage of H2O2（30% solution） 3 mL/L, of copper iron 4 g/L, and pH in range 3--4; in adsorption, proper dosage of active carbon （AC） 10 g/L, pH in range 4--5, and stirring time 60 min, In the further study by using orthogonality design method, optimal technologic parameters of oxidatlon/adsorptlon in combination are ascertained： dosage of H202 in solution 3 mL/L, of copper iron 4 g/L, and of AC 10 g/L, pH=4.5, and stirring time 80 man. For AWW sample alkalinized, treated by oxidatlon/adsorption and having CODcr = 315 mg/L, coagulation by PAC at dosage 2.5 g/L as a last treating step gives a qualified purified water with following parameters： pH = 7.5, CODcr= 115 mg/L, or PR of CODcr = 97.4%, SS content 4 mg/L （624 mg/L for original AWW sample）, oil eontent 0.4 mg/L （1.41 mg/L）, chromaticity 6 mg/L （ 110 mg/L）, and Cl^- concentration 198 rng/L（47341 mg/L）, which fulfils the grade Ⅱ norms of state standard for effluent waste. waters.
出处
《油田化学》
CAS
CSCD
北大核心
2008年第1期90-93,共4页
Oilfield Chemistry
关键词
酸化废水
污水处理
氧化
吸附
混凝
处理工艺
化学需氧量(COD)
外排污水
reservoir acidizing wastewater
wastewater treatment
axidation
adsorption
coagulation
treating technology
chemical oxygen demand （COD）
effluent （discharge） waste water
