基于高效复合降解菌系的生物活性炭技术深度处理焦化废水的研究

发布时间：2018-08-15 14:47

【摘要】：焦化废水经二级生化处理后，仍含有多种有毒、有害的有机物，其中多环芳烃、杂环芳烃这些有毒害的物质是很难被生化降解的，针对焦化废水二级处理出水的特征，高效复合菌技术应用而生，并且在焦化废水的处理方面取得了良好的效果。本课题以焦化废水中难降解有机物为降解目标，利用课题组分离得到的具有自主知识产权的降解菌株构建高效焦化废水降解菌群；然后以活性炭固定高效复合菌制备生物活性炭，并将其用于焦化废水的深度处理，以期达到工业再生水的回用标准。 研究结果表明：（1）菌株B、Y-4、P、W-1、W-2按2：2：0.5：1.5：1（菌悬液的体积比）组合对模拟废水的降解率最高，96h内有机物平均降解率为86.76%；高效复合菌系适合在中温偏碱的环境下生存。（2）利用响应面法可以得到高效复合菌的最优降解条件：pH为7，温度为34℃，摇床转速为170r·min~(-1)；在最优环境条件下，96h内模拟废水中有机物的平均降解率可达90.3%，其中萘全部降解，吡啶降解91%以上，异喹啉降解80%以上；各有机物的降解均符合二级动力学模型。（3）加入葡萄糖浓度为200mg·L~(-1)，有机物的降解率由原来的89.4%提高到96.7%，分别以淀粉和邻苯二甲酸为共代谢基质时，对高效复合菌降解模拟废水的影响均很小；较单一菌株B、P、Y-4、W-1、W-2而言，高效复合菌对模拟废水的降解效果更好，且能降解更多种类的有机物；在实际的焦化废水环境中，高效复合菌对萘、吡啶、异喹啉的平均降解率为72.4%。（4）盐酸预处理过的活性炭上微生物生长代谢旺盛，且COD_(Cr)的去除率更高；以高效复合菌制备的生物活性炭在连续使用16次后，对COD_(Cr)的去除率仍可达到65%，明显高于其他单一菌株制备的生物活性炭。（5）基于高效复合菌的生物活性炭技术用于焦化废水的连续深度处理，出水COD_(Cr)可降到50mg·L~(-1)以下，COD_(Cr)的去除率基本达到70%，出水色度则降到50度以下,去除率在90%以上。（6）进水流量低于2mL·min~(-1)时，，出水COD_(Cr)基本上满足再生水的回用标准；有机物的去除主要集中在活性炭柱的中下部，炭柱底层的脱氢酶活性也相对较高；水温为25~32℃时，出水水质要优于低温环境。（7）采用气质联用仪对稳定运行后的出水进行分析，结果显示，仍有部分有机物未能被彻底降解，其中主要包括邻苯二甲酸酯类，长链烃类等。
[Abstract]:After secondary biochemical treatment, coking wastewater still contains a variety of toxic and harmful organic substances. The toxic substances such as polycyclic aromatic hydrocarbons and heterocyclic aromatic hydrocarbons are difficult to biodegrade. In view of the characteristics of secondary treatment effluent from coking plant wastewater, The high efficiency compound bacteria technology is applied and good effect has been obtained in the treatment of coking wastewater. In this paper, the degradation target of refractory organic compounds in coking wastewater was used to construct high efficient biodegradable microflora of coking wastewater using the biodegradable strains with independent intellectual property rights which were isolated by our research group. Then biological activated carbon was prepared by immobilization of high efficiency bacteria with activated carbon and used in advanced treatment of coking wastewater in order to meet the reuse standard of industrial regenerated water. The results showed that: (1) the degradation rate of simulated wastewater was the highest in the combination of 2: 2: 0.5: 1.5: 1 (volume ratio of bacteria suspension). The average degradation rate of organic matter in 96 h was 86.76%. The high efficiency compound bacteria system is suitable for survival in the medium temperature partial alkali environment. (2) by using response surface method, the optimum degradation conditions of high efficiency compound bacteria can be obtained: ph: 7, temperature 34 鈩

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