低浓度乙酸盐诱导下厌氧氨氧化与异养反硝化高效耦合脱氮

发布时间：2018-04-24 23:07

本文选题：乙酸盐 + 厌氧氨氧化　；参考：《环境工程学报》2016年11期

【摘要】：通过连续流实验研究了低浓度乙酸盐诱导下厌氧氨氧化颗粒污泥与异养反硝化菌的耦合脱氮性能,同时采用批试实验考察耦合系统中的氮素转化及去除途径。结果表明:采用低浓度乙酸盐对厌氧氨氧化颗粒污泥进行驯化,可以实现厌氧氨氧化与异养反硝化的高效耦合脱氮。系统在稳定时期,进水NH_4~+-N为30~40 mg·L~(-1)、NO_2~--N为45~55 mg·L~(-1)、CH_3COONa为60~80 mg·L~(-1),NH_4~+-N、NO_2~--N和TN的去除率分别为93.84%、94.62%和86.46%。耦合系统中的颗粒污泥同时存在厌氧氨氧化特性、硝化特性和反硝化特性。颗粒污泥表现出良好的厌氧氨氧化特性,总氮去除速率为12.46 mg·(g MLSS·h)~(-1)。系统中存在的硝化细菌可以消耗进水中的溶解氧从而缓解溶解氧对ANAMMOX菌的抑制,其中AOB活性高于NOB活性。系统中颗粒污泥对硝氮的反硝化作用强于对亚硝氮的反硝化作用,亚硝氮反硝化和硝氮反硝化的降解速率分别为1.89和3.59 mg·(g MLSS·h)~(-1)。当亚硝氮和硝氮同时存在时,反硝化菌优先将硝氮还原成亚硝氮。
[Abstract]:The coupling denitrification of anaerobic ammonia oxidized granular sludge and heterotrophic denitrifying bacteria induced by low concentration acetate was studied by continuous flow experiment. The nitrogen conversion and removal pathway in the coupling system were investigated by batch test. The results showed that the anaerobic ammonia oxidation granular sludge could be domesticated with low concentration of acetate, and the coupling denitrification between anaerobic ammonia oxidation and heterotrophic denitrification could be realized. During the stable period of the system, the removal rates of NH _ 4 ~ -N in the influent NH _ 4 ~ -N = 30 ~ 40 mg / L / L ~ (-1) and no _ (2 /) -N = 45 ~ (55) mg / L ~ (-1) respectively are 93.84% (94.62%) and 86.46% (n = 86.46), respectively. The removal rates of NH _ 4 ~ -N ~ -N and TN are 93.84% (94.62%) and 86.46% (n = 86.46), respectively, when the influent NH _ 4 ~ -N is 6080 mg / L ~ (-1). Anaerobic ammonia oxidation, nitrification and denitrification exist simultaneously in granular sludge in coupling system. The granular sludge showed good anaerobic ammonia oxidation, and the removal rate of total nitrogen was 12.46 mg / g MLSS / L ~ (-1). The nitrifying bacteria in the system can consume the dissolved oxygen in the influent to ease the inhibition of the dissolved oxygen to the ANAMMOX bacteria, and the AOB activity is higher than the NOB activity. In the system, the denitrification effect of granular sludge was stronger than that of nitrite nitrogen. The degradation rates of nitrite denitrification and nitrate denitrification were 1.89 and 3.59 mg / MLSS respectively. Denitrifying bacteria preferentially reduced nitrate to nitrite when nitrite and nitrate existed at the same time.
【作者单位】：北京工业大学建筑工程学院北京市水质科学与水环境恢复工程重点实验室;中国城市建设研究院有限公司;
【基金】：国家水体污染控制与治理科技重大专项(2014ZX07201-011) 北京市自然科学基金资助项目(8122005) 中国城市建设研究院院级课题(Y07H13074)
【分类号】：X703

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