微波处理焦化尾水中难降解有机物的GC/MS分析  

Microwave Treatment of Refractory Organic Compounds in Coking Tail Water by GC / MS Analysis

作　　者：罗飞翔[1] 蔡昌凤[1] 孙敬 宋丹丹[1] 

机构地区：[1]安徽工程大学生物与化学工程学院,安徽芜湖214000

出　　处：《重庆理工大学学报（自然科学）》2016年第3期57-63,共7页Journal of Chongqing University of Technology：Natural Science

基　　金：安徽省自然科学基金资助项目(08040102002)

摘　　要：对焦化尾水中生物法难降解的有机物用微波消解,结合固相萃取技术（SPE）及气相色谱/质谱（GC/MS）法对焦化尾水中有机物进行检测分析,探讨了焦化尾水中难降解有机物在微波消解下的降解效果与机理。进行了不同p H值（3,原水,8.5）、消解时间（4 min,6 min）、微波功率（600 W,1 000 W）、恒压（P=0.2 MPa）下的微波消解实验。结果发现：微波处理后,COD由原来的238 mg/L下降到100 mg/L以内,去除率达到57%~65%,恒压消解罐中有固定碳产生。GC/MS分析表明：焦化尾水中有机物的总峰面积为31 152 370,其中苯系物和多环芳烃占有机物总量的90%以上,石油烃类占有机物总量的4.99%,邻苯二甲酸酯类物质占有机物总量的1.93%;经微波消解后有机物的总峰面积降到444 529以下,其中苯系物及杂环化合物占其有机物总量的20%以下,石油烃占其有机物总量的40%以上,酮类约占其有机物总量的20%,酯类以及其他物质占其有机物总量的20%左右。结果表明：在微波辐照下,原水中苯系物以及多环芳烃等有机物吸收微波,发生断链、脱氢、生焦,但长链石油烃含量在微波消解后并未发生太大变化。The refractory organic matter of coking tail water biological method was digested with microwave,and coking tail organic compounds in water were detected and analyzed combined withsolid phase extraction（ SPE） and gas chromatography / mass spectrum（ GC / MS） method,and the effect and mechanism of degradation under microwave digestion of coking refractory organics in the tail water was discussed. Experimental microwave digestion under different conditions of p H（ 3,raw water 8. 5）,digestion time（ 4 min,6 min）,microwave power（ 600 W,1 000 W）,constant pressure（ P = 0. 2 MPa） were carried out. The results show that： after microwave treatment,COD is increased from 238 mg / L down to less than 100 mg / L,and the removal rate reaches 57% ~ 65%,and there is constant pressure digestion tank fixed carbon produced. GC / MS analysis showed that：total peak area of organic compounds in coking tail water is 31,152,370,and the BTEX and PAHs accounts for more than 90% of the total organic compounds,and petroleum hydrocarbons accounts for4. 99% of the total organic compounds,and phthalates accounts for 1. 93% of the total organic compounds. After microwave digestion,the organic compounds below the total peak area drops to444,529,including BTEX and heterocyclic compounds account for 20% or less of the total organic compounds,petroleum hydrocarbons accounted for more than 40% of the total organic compounds,and ketones account for its organic 20% of the total,and 20% of its esters and other organic substances is about the total. Considered under microwave irradiation,raw water BTEX and polycyclic aromatic hydrocarbons and other organic compounds absorb microwaves,and has chain scission,dehydrogenation and coke; but the long chain of petroleum hydrocarbon content has not changed much after microwave digestion.

关 键 词：焦化尾水 微波 GC/MS 难降解有机物 降解机理 

分 类 号：X703[环境科学与工程—环境工程]