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首页> 美国卫生研究院文献>International Journal of Environmental Research and Public Health >Effects of Sludge Retention Times on Nutrient Removal and Nitrous Oxide Emission in Biological Nutrient Removal Processes
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Effects of Sludge Retention Times on Nutrient Removal and Nitrous Oxide Emission in Biological Nutrient Removal Processes

机译：污泥停留时间对生物养分去除过程中养分去除和一氧化二氮排放的影响

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Sludge retention time (SRT) is an important factor affecting not only the performance of the nutrient removal and sludge characteristics, but also the production of secondary pollutants such as nitrous oxide (N2O) in biological nutrient removal (BNR) processes. Four laboratory-scale sequencing batch reactors (SBRs), namely, SBR5, SBR10, SBR20 and SBR40 with the SRT of 5 d, 10 d, 20 d and 40 d, respectively, were operated to examine effects of SRT on nutrient removal, activated sludge characteristics and N2O emissions. The removal of chemical oxygen demand or total phosphorus was similar under SRTs of 5–40 d, SRT mainly affected the nitrogen removal and the optimal SRT for BNR was 20 d. The molecular weight distribution of the effluent organic matters was in the range of 500–3,000 Da under SRTs of 5–40 d. The lowest concentration of the effluent soluble microbial products concentration was obtained at the SRT of 5 d. Nitrifier growth was limited at a short SRT and nitrite existed in the effluent of SBR5. With increasing SRTs, mixed liquor suspended solids concentration increased while the excess sludge production was reduced due to the high endogenous decay rate at high SRTs. Endogenous decay coefficients were 0.020 d−1, 0.036 d−1, 0.037 d−1 and 0.039 d−1 under SRTs of 5–40 d, respectively. In BNR, the N2O emission occurred mainly during the aerobic phase and its emission ratio decreased with increasing SRTs. The ratio between the N2O-N emission and the removed ammonium nitrogen in the aerobic phase was 5%, 3%, 1.8% and 0.8% at the SRT of 5 d, 10 d, 20 d and 40 d, respectively. With low concentrations of dissolved oxygen and high concentrations of oxidized nitrogen, the N2O emission was significantly accelerated due to heterotrophic denitrification activities.
机译：污泥保留时间（SRT）是一个重要因素，不仅影响营养物去除性能和污泥特性，而且还影响生物营养物去除（BNR）过程中二次污染物如一氧化二氮（N2O）的产生。操作了四个实验室规模的分批反应器（SBR），分别是SRT为5 d，10 d，20 d和40 d的SBR5，SBR10，SBR20和SBR40，以检查SRT对活化的养分去除的影响污泥特性和N2O排放。在5-40 d的SRT下，化学需氧量或总磷的去除量相似，SRT主要影响氮的去除量，BNR的最佳SRT为20 d。在5–40 d的SRT下，污水中有机物的分子量分布在500–3,000 Da的范围内。 SRT为5 d时，废水中可溶性微生物产物的浓度最低。 SRT短时硝化剂的生长受到限制，SBR5的流出物中存在亚硝酸盐。随着SRT的增加，由于高SRT的高内生衰减率，混合液中悬浮固体的浓度增加，而多余的污泥产生减少。内生衰减系数分别为0.020 d -1 ，0.036 d -1 ，0.037 d -1 和0.039 d -1 >分别在5-40 d的SRT下。在BNR中，N2O排放主要发生在好氧阶段，其排放比随着SRT的增加而降低。在5 d，10 d，20 d和40 d的SRT下，好氧相中N2O-N排放与去除的铵态氮之间的比例分别为5％，3％，1.8％和0.8％。在低浓度的溶解氧和高浓度的氧化氮的作用下，由于异养反硝化活性，N2O排放显着加速。

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