基于天然黄铁矿的类Fenton体系处理焦化废水生化出水的研究  

Study on the treatment of coking wastewater biochemical effluent by Fenton-like system based on natural pyrite

作　　者：李曼 祁丽 彭静波 LI Man;QI Li;PENG Jingbo(Department of Environmental Engineering,Henan Vocational College of Water Conservancy and Environment,Zhengzhou 450008,China;School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;CHN Energy Xingyang Thermal Power Co.,Ltd.,Zhengzhou 450100,China)

机构地区：[1]河南水利与环境职业学院环境工程系,河南郑州450008 [2]天津城建大学环境与市政工程学院,天津300384 [3]国能荥阳热电有限公司,河南郑州450100

出　　处：《工业水处理》2024年第3期81-88,共8页Industrial Water Treatment

基　　金：国家自然科学基金青年基金项目(2018Z14_0418);天津市教委科研项目(2019KJ110)。

摘　　要：焦化废水经过生化处理后仍含有大量难降解成分,直接外排会导致自然界水体污染。针对经典Fenton反应存在产生含铁污泥、适用pH范围较窄致使其在实际应用中局限性较大的问题,采用天然黄铁矿作为非均相Fenton反应催化剂对焦化废水生化出水进行处理,并以废水中苯酚作为模型污染物探究其氧化机理。结果表明,该工艺可以在较为宽泛的初始pH条件下对废水COD进行有效去除;废水COD的去除速率与黄铁矿的添加量呈正比,高浓度H_(2)O_(2)条件下COD去除速率略有增加,但增加的速度变慢;体系中存在均相和非均相两种催化条件,加入·OH捕获剂后,体系降解效率大幅度降低,证明体系中的主要氧化物种为·OH;苯酚是焦化废水中主要的有机污染物,检测了使用黄铁矿的类Fenton工艺降解苯酚过程中的中间产物,苯酚首先被氧化成对苯酚,随后很快转化为对苯醌,最终被氧化成小分子酸。After biochemical treatment,coking wastewater still has a large number of refractory components,and direct discharge will lead to natural water pollution.The classical Fenton reaction has problems such as the generation of iron-containing sludge and the narrow pH application range,which is limited in practical applications.Natural pyrite was used as a heterogeneous Fenton reaction catalyst to treat the biochemical effluent of coking wastewater,and phenol in the wastewater was used as a model pollutant to explore its oxidation mechanism.The results indicated that the process could effectively remove COD from wastewater under relatively broad initial pH conditions.The removal rate of COD in wastewater was proportional to the amount of pyrite added,and the removal rate of COD increased slightly under the condition of high concentration of H_(2)O_(2),but the increase rate slowed down.There were two catalytic conditions in the system,homogeneous and heterogeneous.After adding ·OH scavenger,the degradation efficiency of the system significantly decreased,indicating that the main free radical in the system was·OH.Phenol was the main organic pollutant in coking wastewater,and the intermediate products of phenol degradation by Fenton-like using pyrite were detected,and phenol was first oxidized to p-phenol,then quickly converted to p-benzoquinone,and finally oxidized to small molecule acids.

关 键 词：黄铁矿 焦化废水生化出水 Fenton反应催化剂 羟基自由基 

分 类 号：X703.1[环境科学与工程—环境工程]