焦化废水预处理及其特征污染物的变化分析

doi:10.16085/j.issn.1000-6613.2017-0310

化工进展 ›› 2017, Vol. 36 ›› Issue (10): 3911-3920.DOI: 10.16085/j.issn.1000-6613.2017-0310

焦化废水预处理及其特征污染物的变化分析

武恒平¹, 韦朝海^1,2, 任源^1,2, 吴锦华^1,2, 刘明¹, 韦聪¹

1. 华南理工大学环境与能源学院, 广东广州 510006;
2. 工业聚集区污染控制与生态修复教育部重点实验室, 广东广州 510006

收稿日期:2017-02-27 修回日期:2017-04-07 出版日期:2017-10-05 发布日期:2017-10-05
通讯作者: 韦朝海,博士,教授,主要研究方向为水污染控制理论及技术.
作者简介:武恒平(1992-),男,硕士研究生.E-mail:290888410@qq.com.
基金资助:
广东省应用型科技研发专项基金（2015B020235005）及国家自然科学基金重点基金（21037001）项目。

Analysis of typical pollutants and its removal characteristics in the pretreatment of coking wastewater

WU Hengping¹, WEI Chaohai^1,2, REN Yuan^1,2, WU Jinhua^1,2, LIU Ming¹, WEI Cong¹

1. School of Environment and Energy, South China University of Technology, Guangzhou 510006, Guangdong, China;
2. The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, Guangdong, China

Received:2017-02-27 Revised:2017-04-07 Online:2017-10-05 Published:2017-10-05

摘要/Abstract

摘要： 焦化废水是典型的有毒/难降解工业有机废水，表现出高浓度、多相、多组分共存的性质，需对其进行预处理以保证后续生物处理系统高效稳定的运行。本文结合实验数据与工程实例，重点分析了重力沉降、蒸氨/脱酚、混凝/气浮、臭氧氧化单元工艺作为预处理技术对焦化废水原水中特征污染物的分离去除情况。研究发现：经过90min重力沉降，56.05%的悬浮颗粒和46.54%的油分得到分离；接着，将初始pH=10的废水蒸氨50min后，在pH=9、T=30℃、R=1∶4、n=3的条件下采用磷酸三丁酯-30%煤油进行萃取脱酚，氨氮和苯酚的去除率分别为69.85%和76.02%；随后，在FeSO₄投加量为1500mg/L、初始pH=9的混凝/气浮反应中，硫化物、氰化物以及氨氮的去除率分别为89.93%、60.68%和2.95%；最后，在臭氧浓度为14mg/L±1mg/L、初始pH=10、反应时间为80min的臭氧氧化反应中，硫化物、氰化物以及氨氮的去除率分别达到94.92%、91.05%和47.26%。上述研究结果对于焦化废水预处理工艺的进一步优化具有指导意义，同时认为，这类废水预处理技术的优化与应用需要综合考虑相分离、产品分离和有毒物质的转化这3个层面有效性与经济性的结合。

关键词: 焦化, 重力沉降, 蒸氨, 脱酚, 混凝, 氧化

Abstract: Coking wastewater contains toxic refractory compounds in high loads,distributed between liquid and suspended solids. The pretreatment including gravity sedimentation,ammonia stripping/phenol extraction,coagulation/air floatation and ozonation was applied prior to biological treatment providing its effective performance. The removal of characteristic pollutants was studied in each pretreatment process. The results showed that 56.05% of suspended solids and 46.54% oil content were removed in 90min gravity sedimentation. Ammonia was stripped for 50min,and phenol was extracted using mixture of tributyl phosphate with 30% kerosene at pH=9,T=30℃,R=1∶4,n=3. Ammonia and phenol were recovered for 69.85% and 76.02%,respectively. At the FeSO₄dosage of 1500mg/L and initial pH=9,coagulation/air floatation removed sulfide,cyanide and ammonia for 89.93%,60.68% and 2.95%,respectively. At the concentration of gaseous ozone 14mg/L±1mg/L and initial pH＝10,sulfide,cyanide and ammonia were degraded as a result of 80min ozonation for 94.92%,91.05% and 47.26%,respectively. The results obtained in the study may serve the optimization of the pretreatment process,targeting the purification performance and the economic efficiency with the separation of phases,the recovery of chemical products and the transformation of toxic pollutants.

Key words: coking, gravity sedimentation, ammonia stripping, phenol extraction, coagulation, oxidation

中图分类号:

X703

武恒平, 韦朝海, 任源, 吴锦华, 刘明, 韦聪. 焦化废水预处理及其特征污染物的变化分析[J]. 化工进展, 2017, 36(10): 3911-3920.

WU Hengping, WEI Chaohai, REN Yuan, WU Jinhua, LIU Ming, WEI Cong. Analysis of typical pollutants and its removal characteristics in the pretreatment of coking wastewater[J]. Chemical Industry and Engineering Progress, 2017, 36(10): 3911-3920.

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焦化废水预处理及其特征污染物的变化分析

Analysis of typical pollutants and its removal characteristics in the pretreatment of coking wastewater

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