【摘要】：焦化廢水經(jīng)二級(jí)生化處理后，仍含有多種有毒、有害的有機(jī)物，其中多環(huán)芳烴、雜環(huán)芳烴這些有毒害的物質(zhì)是很難被生化降解的，針對(duì)焦化廢水二級(jí)處理出水的特征，高效復(fù)合菌技術(shù)應(yīng)用而生，并且在焦化廢水的處理方面取得了良好的效果。本課題以焦化廢水中難降解有機(jī)物為降解目標(biāo)，利用課題組分離得到的具有自主知識(shí)產(chǎn)權(quán)的降解菌株構(gòu)建高效焦化廢水降解菌群；然后以活性炭固定高效復(fù)合菌制備生物活性炭，并將其用于焦化廢水的深度處理，以期達(dá)到工業(yè)再生水的回用標(biāo)準(zhǔn)。 研究結(jié)果表明：（1）菌株B、Y-4、P、W-1、W-2按2：2：0.5：1.5：1（菌懸液的體積比）組合對(duì)模擬廢水的降解率最高，96h內(nèi)有機(jī)物平均降解率為86.76%；高效復(fù)合菌系適合在中溫偏堿的環(huán)境下生存。（2）利用響應(yīng)面法可以得到高效復(fù)合菌的最優(yōu)降解條件：pH為7，溫度為34℃，搖床轉(zhuǎn)速為170r·min~(-1)；在最優(yōu)環(huán)境條件下，96h內(nèi)模擬廢水中有機(jī)物的平均降解率可達(dá)90.3%，其中萘全部降解，吡啶降解91%以上，異喹啉降解80%以上；各有機(jī)物的降解均符合二級(jí)動(dòng)力學(xué)模型。（3）加入葡萄糖濃度為200mg·L~(-1)，有機(jī)物的降解率由原來(lái)的89.4%提高到96.7%，分別以淀粉和鄰苯二甲酸為共代謝基質(zhì)時(shí)，對(duì)高效復(fù)合菌降解模擬廢水的影響均很��；較單一菌株B、P、Y-4、W-1、W-2而言，高效復(fù)合菌對(duì)模擬廢水的降解效果更好，且能降解更多種類的有機(jī)物；在實(shí)際的焦化廢水環(huán)境中，高效復(fù)合菌對(duì)萘、吡啶、異喹啉的平均降解率為72.4%。（4）鹽酸預(yù)處理過(guò)的活性炭上微生物生長(zhǎng)代謝旺盛，且COD_(Cr)的去除率更高；以高效復(fù)合菌制備的生物活性炭在連續(xù)使用16次后，對(duì)COD_(Cr)的去除率仍可達(dá)到65%，明顯高于其他單一菌株制備的生物活性炭。（5）基于高效復(fù)合菌的生物活性炭技術(shù)用于焦化廢水的連續(xù)深度處理，出水COD_(Cr)可降到50mg·L~(-1)以下，COD_(Cr)的去除率基本達(dá)到70%，出水色度則降到50度以下,去除率在90%以上。（6）進(jìn)水流量低于2mL·min~(-1)時(shí)，，出水COD_(Cr)基本上滿足再生水的回用標(biāo)準(zhǔn)；有機(jī)物的去除主要集中在活性炭柱的中下部，炭柱底層的脫氫酶活性也相對(duì)較高；水溫為25~32℃時(shí)，出水水質(zhì)要優(yōu)于低溫環(huán)境。（7）采用氣質(zhì)聯(lián)用儀對(duì)穩(wěn)定運(yùn)行后的出水進(jìn)行分析，結(jié)果顯示，仍有部分有機(jī)物未能被徹底降解，其中主要包括鄰苯二甲酸酯類，長(zhǎng)鏈烴類等。
[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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