厌氧氨氧化反应的启动和生物燃料乙醇废水反应条件优化. (Chinese)

Start-up of ANAMMOX and optimization of reaction conditions for biofuel ethanol wastewater. (English)

[Objective] Biofuel ethanol is a kind of green energy, but on the process of production it produces a large amount of high concentration of organic wastewater. The traditional process of biological removal nitrogen has been unable to meet the requirements of high standard nitrogen removal in the production industry, thus we need to explore a new way of nitrogen removal, and screen out the best reaction conditions. [Method] In the present study, an improved upflow anaerobic sludge bed (UASB) reactor was used to treat biofuel ethanol wastewater, and the conditions suitable for the growth of ANAMMOX bacteria were controlled to achieve economic and efficient treatment of high nitrogen wastewater. The influent water in the start-up stage of ANAMMOX was self-supplied water. The concentration of ammonia nitrogen and nitrite nitrogen in the self-supplied water was gradually increased to explore the optimal range of nitrogen concentration during start-up. Once successful start-up and stable operation of the reaction, the secondary digested liquid of biofuel ethanol from production plant was pretreated as influent water. ANAMMOX reaction conditions were optimized by adjusting water pH and temperature, and the optimal range of pH and temperature were determined according to the actual production condition. [Result] A comprehensive analysis of the concentration of nitrogen, removal rate of nitrogen, total nitrogen reduction reaction (NRR) and loading rate (NLR) in the influent and effluent showed that ANAMMOX reaction started successfully after 70 days. At this stage, the maximum removal rate of ammonia nitrogen reached up to 97.8% and total nitrogen to 96.0%. When pH value was 7.5-8.0 and reaction temperature was 25-35 ℃, the nitrogen removal efficiency was better. In this range, the NRR and NLR complied with the equation y = 2158x-0.94 (R~2 = 0.995, P<0.01). [Conclusion] Controlling pH and reaction temperature in the optimal range can improve the requirement of efficient denitrification of industrial wastewater, which can be used to purify this kind of wastewater in production process. [ABSTRACT FROM AUTHOR]

[目的] 生物燃料乙醇是一种绿色能源, 在其生产中会伴随着大量高浓度有机废水的产生, 生产工业中高标准的脱氮需求传统的生物脱氮工艺已无法满足, 需要探索新的脱氮途径, 并筛选出最佳反应条件. [方法] 采用改良的上流式厌氧污泥床（UASB）反应器处理生物燃料乙醇废水, 控制适合厌氧氨氧化菌生长的条件, 实现高氮废水的高效经济处理. 厌氧氨氧化启动阶段进水为自配水, 逐步提高自配水中氨氮和亚硝酸盐氮浓度, 探究实现启动时氮素浓度的最佳范围. 在反应成功启动并且运行稳定后, 将预处理后的生物燃料乙醇生产厂二级消化液作为进水, 厌氧氨氧化反应条件优化通过调节进水pH和反应温度完成, 并根据生产中实际状况, 确定pH和反应温度的最适范围. [结果] 综合分析厌氧氨氧化反应阶段内氮素进, 出水浓度, 氮去除率, 总氮去除负荷和容积负荷, 结果发现70 d时厌氧氨氧化反应已能成功启动, 氨氮去除率最高达97.8%,总氮去除率最高达96.0%. pH 7.5～8.0, 反应温度25～35℃时, 除氮效果均较好, 在此范围内总氮去除负荷和容积负荷符合方程y=2158x-0.94(R2 =0.995,P<0.01). [结论] 在厌氧氨氧化反应器中进行生物燃料乙醇厌氧氨氧化脱氮处理时, 控制pH值和反应温度在最佳范围内, 可以满足生产废水高效脱氮要求, 适宜该类高氮废水处理的工业化运行 [ABSTRACT FROM AUTHOR]

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