煤液化高浓度污水处理厂中VOCs污染水平及其归趋

发布时间：2018-09-09 12:13

【摘要】：探讨了VOCs在煤液化高浓度污水处理过程中的去除规律、污染水平和分布行为,采用顶空-气相色谱/质谱法(HS/GC/MS)进行分析检测,结果表明,各工艺段出水中累计检出26种目标VOCs,且均以苯、乙苯、苯乙烯、甲苯、二甲苯(邻、间、对)等苯系物为主,ΣVOCs总浓度在339.28~562.36μg/L;4个产泥工艺段产出污泥中均以苯或苯乙烯含量为最高,ΣVOCs吸附量以及各VOCs单体的Kd值均以3T活性污泥段为最高;在吸附剂相对稳定时,污泥更倾向于吸附辛醇-水系数(Kow)大的VOCs污染物。污水处理过程中ΣVOCs的主要归趋途径为随水排出(60.33%),其次为污泥吸附(22.95%)和挥发降解(16.72%);随着lgKow的增大VOCs出水排放率逐渐降低,吸附去除率逐步增大,挥发降解去除率则出现先增后减的变化趋势,并在lgKow值为3.5左右时达到最大值。
[Abstract]:The removal law, pollution level and distribution behavior of VOCs in the treatment of high concentration coal liquefaction wastewater were discussed. The results showed that the removal rate, pollution level and distribution behavior of VOCs were analyzed by headspace gas chromatography / mass spectrometry (HS/GC/MS). A total of 26 target VOCs, were detected in the effluent of each process with benzene, ethylbenzene, styrene, toluene, xylene (o, m). The total concentration of 危 VOCs was 339.28 渭 g / L in 562.36 渭 g / L, benzene or styrene content was the highest, 危 VOCs adsorption capacity and Kd value of each VOCs monomer were the highest in 3T activated sludge, and when the adsorbent was relatively stable, the content of benzene or styrene was the highest. Sludge is more inclined to adsorb VOCs pollutants with high octanol-water coefficient (Kow). In the process of wastewater treatment, 危 VOCs is mainly discharged with water (60.33%), followed by sludge adsorption (22.95%) and volatile degradation (16.72%), and the effluent discharge rate of VOCs decreases gradually with the increase of lgKow, and the adsorption removal rate increases gradually. The removal rate of volatile degradation increased first and then decreased, and reached the maximum when the lgKow value was about 3. 5.
【作者单位】：河北工程大学资源学院;中国环境科学研究院固体废物污染控制技术研究所;
【基金】：国家环境保护公益性行业科研专项资助项目(201209023) 河北省自然科学基金资助项目(D2013402042)
【分类号】：X784

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