厌氧颗粒活性炭折板工艺处理丁辛醇废水效能研究

Study on the treatment of butanol octanol wastewater by anaerobic granular activated carbon baffled reactor

丁辛醇废水(BOW)是一种新型煤化工废水,含有高浓度的难降解有毒有机污染物,对人体健康和生态环境造成危害。萃取法、焚烧法、空气催化氧化法等物化法可用于丁辛醇废水的处理,但成本较高、流程复杂。厌氧消化是丁辛醇废水的绿色、高效处理技术之一,然而传统的厌氧工艺易受有毒污染物、高盐等因素影响。对高盐条件下厌氧颗粒活性炭折板工艺(GAC-ABR)处理丁辛醇废水的启动、盐冲击与恢复过程及其微生物菌群变化进行探索。结果表明,与厌氧折板反应器(ABR)工艺相比,GAC-ABR工艺可提高丁辛醇废水厌氧处理的甲烷产量并缓解酸化现象。在GAC-ABR工艺中,污泥的嗜乙酸产甲烷活性提高了1.94-2.27倍,且污泥的电子传递系统活性提高了13.1%-16.4%。微生物群落结构分析表明,GAC-ABR工艺中富集的电活性互营微生物Syntrophomonas和Methanosarcina是提高丁辛醇废水处理效果的关键;其中,Syntrophomonas表现出良好的耐盐性,而Methanosarcina的耐盐性弱于Methanosphaera和Methanobacteria。

Butanol octanol wastewater(BOW)is a new type of coal chemical wastewater that contains high concentrations of toxic organic pollutants that are difficult to degrade and pose a risk to human health and the ecological environment.Physical and chemical methods such as extraction,incineration and air-catalytic oxidation can be used for the treatment of butanol octanol wastewater,but the cost is high and the process is complicated.Anaerobic digestion is one of the green and efficient treatment technologies for wastewater,however,the traditional anaerobic process is susceptible to toxic pollutants,high salt and other factors.The start-up,salt shock and recovery processes,changes in microbial community of anaerobic granular activated carbon baffled reactor(GAC-ABR)for butanol octanol wastewater treatment under high salt conditions were explored.The results showed that the GAC-ABR process improved methane production and mitigates acidification in the anaerobic treatment of butanol octanol wastewater compared to ABR.In GAC-ABR,the acetoclastic methanogenic activity of sludge was increased by 1.94-2.27 times and the electron transport system activity of sludge was increased by 13.1%-16.4%.Microbial community structure analysis showed that the electroactive syntrophic microorganisms Syntrophomonas and Methanosarcina enriched in GAC-ABR process were the key to improving the treatment of butanol octanol wastewater.Among them,Syntrophomonas showed better salt tolerance,while Methanosarcina was less tolerant than Methanosphaera and Methanobacteria.