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纳米铜对自养脱氮亚硝化工艺的短期及恒久影响

2020-04-01

为考查纳米铜对自养脱氮亚硝化工艺影响,在SBR回响器内别离举办短期影响尝试(8 h)及恒久影响尝试(20 d),研究氨氮氧化速率、氮素转化纪律及污泥机能的变革纪律.短期尝试功效表白,,低质量浓度的纳米铜(≤1 mg/L)对亚硝化有促进浸染,纳米铜质量浓度在3~30 mg/L内严重抑制自养脱氮亚硝化,氨氮氧化速率低落率为21.9%~44.9%.纳米铜为50 mg/L时,由于质量浓渡过高导致纳米颗粒团簇,低落了真正浸染于细胞的量,亚硝化活性获得强化.恒久尝试功效表白,恒久袒露在低质量浓度(1 mg/L)的纳米铜情况中,氨氮氧化速率受到严重抑制,氨氮去除率从90%低落为44.8%,氨氧化细菌比亚硝酸盐氧化细菌对纳米铜越发敏感.在恒久浸染后,污泥中的铜含量增加,胞外聚合物含量增加,清除纳米铜抑制后,两者均低落.纳米铜对自养脱氮亚硝化工艺的微生物活性、脱氮本领、污泥机能均具有较大的影响.
The short-term and long-term effects of Cu nanoparticles (NPs) on partial nitrification (PN) process were studied in SBR. The ammonia oxidation rate, nitrogen removal and sludge property were analyzed within exposure of different concentrations of Cu NPs. The short-term result suggested that the Cu NPs with 1 mg/L was beneficial for PN process, while the NPs in 3-30 mg/L significantly inhibit PN. As a result, the ammonia oxidation rate decreased to 21.9%-44.9% of the initial value. When the Cu NPs was 50 mg/L, the PN process was enhanced, which was mainly because the aggregation reduced the actual concentration of NPs acting on the microorganisms. Long-term exposure within low Cu NPs (1 mg/L) could also suppress the PN process, and the ammonia removal efficiency decreased to 44.8% from 91%. The ammonia-oxidizing bacteria was more severe to the Cu NPs than nitrite-oxidizing bacteria. After the long-term exposure, the copper and extracellular polymeric substance in sludge both increased, and then decreased when no Cu NPs was added to the PN system anymore. Cu NPs performed a significant effect on microbial activity, nitrogen removal ability and sludge property.

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