煤气废水酸化破乳预处理功效探讨

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煤气废水酸化破乳预处理功效探讨

张文启; 马军; 杨世东; 张涛; 李永峰

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2006-06-28 发布日期:2006-06-28
通讯作者: 张文启

Pretreatment of Coal Gasification Wastewater by Acidification Demulsion

ZHANGWenqi; MAJun; YANGShidong; ZHANGTao; LIYongfeng

School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China

Received:1900-01-01 Revised:1900-01-01 Online:2006-06-28 Published:2006-06-28
Contact: ZHANG Wenqi

摘要/Abstract

摘要： General pretreatment processes of ammonia stripping and phenols solvent extraction can reduce the concentration of toxic compounds of the coal gasification wastewater for the following biological treatment. However, some emulsified coal tar still exists in the influent and many substances in coal tar are refractory and toxic to microorganisms. This study is mainly on the removal of emulsified coal tar by acidification demulsion. The ex-perimental results show that the acidification process of the wastewater by pure hydrochloric acid can reduce the chemical oxygen demand (COD), total organic carbon (TOC), total phenolics and oil about 3.1%—11.3%, 6%—10.8%, 5.3%—8.6% and 25.2%—57.4% respectively with pH value in the range of 4 to 7. The analysis of molecu-lar weight distribution indicates that compounds removed from the wastewater by this process are large molecular substances. The experiment also shows that the efficiency of COD removal in the demulsion process by different acids is different and the phosphoric acid is prominent. The preserved time of the wastewater also affects the effi-ciency of demulsion. Small amount low-cost solid additives including kaolin and diatomite can improve the rate of coal tar sedimentation and enhance the removal efficiency of organics in the phosphoric acidification process.

关键词: coal gasification wastewater;acidification;demulsion;pretreatment;coal tar

Abstract: General pretreatment processes of ammonia stripping and phenols solvent extraction can reduce the concentration of toxic compounds of the coal gasification wastewater for the following biological treatment. However, some emulsified coal tar still exists in the influent and many substances in coal tar are refractory and toxic to microorganisms. This study is mainly on the removal of emulsified coal tar by acidification demulsion. The ex-perimental results show that the acidification process of the wastewater by pure hydrochloric acid can reduce the chemical oxygen demand (COD), total organic carbon (TOC), total phenolics and oil about 3.1%—11.3%, 6%—10.8%, 5.3%—8.6% and 25.2%—57.4% respectively with pH value in the range of 4 to 7. The analysis of molecu-lar weight distribution indicates that compounds removed from the wastewater by this process are large molecular substances. The experiment also shows that the efficiency of COD removal in the demulsion process by different acids is different and the phosphoric acid is prominent. The preserved time of the wastewater also affects the effi-ciency of demulsion. Small amount low-cost solid additives including kaolin and diatomite can improve the rate of coal tar sedimentation and enhance the removal efficiency of organics in the phosphoric acidification process.

Key words: coal gasification wastewater, acidification, demulsion, pretreatment, coal tar

张文启, 马军, 杨世东, 张涛, 李永峰 . 煤气废水酸化破乳预处理功效探讨[J]. CIESC Journal.

ZHANGWenqi, MAJun, YANGShidong, ZHANGTao, LIYongfeng. Pretreatment of Coal Gasification Wastewater by Acidification Demulsion
[J]. .

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煤气废水酸化破乳预处理功效探讨

Pretreatment of Coal Gasification Wastewater by Acidification Demulsion

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