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首页> 外文期刊>International Journal of Environmental Science and Technology >Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater
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Effects of sludge pretreatment on sludge reduction in a lab-scale anaerobic/anoxic/oxic system treating domestic wastewater

机译：实验室规模厌氧/缺氧/氧化系统处理生活污水中污泥预处理对污泥减少的影响

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Excess sludge disposal is one of the serious challenges in biological wastewater treatment. Reduction of sludge production would be an ideal way to solve sludge-associated problems rather than the post-treatment of the sludge produced. In this study, a new wastewater treatment process combining anaerobic/anoxic/oxic system with thermochemical sludge pretreatment was tested in a laboratory scale experiment. In this study, the effects of the sludge pretreatment on the excess sludge production in anaerobic/anoxic/oxic were investigated. The system was operated in two Runs (1 and 2). In Run 1, the system was operated as a reference and in Run 2, a part of the mixed liquid was pretreated thermochemically and was returned to the bioreactor. The average solubilization efficiency of pretreated sludge was found to be about 35 % during the study period of 220 days. Sludge production rate in Run 2 was less than that in Run 1 by about 52 %. Total phosphorous was removed by enhanced biological phosphorous removal with the removal efficiency of 83-87 % and 81-83 % for Run 1 and Run 2, respectively. Total nitrogen removal in Run 2 (79-82 %) was slightly higher than that in Run 1 (68-75 %). The mixed liquor suspended solids/ mixed liquor volatile suspended solids ratio was identical after both runs in the range 78-83 %. The effluent water qualities were not significantly affected when operated with thermochemical pretreatment at pH 11 and 60 degrees C for 3 h during 7 months. From the present study it is concluded that thermochemical sludge pretreatment of anaerobic/anoxic/ oxic process plays an important role in reduction of sludge production.
机译：过多的污泥处理是生物废水处理中的严重挑战之一。减少污泥的产生将是解决与污泥相关的问题的理想方法，而不是对产生的污泥进行后处理。在这项研究中，在实验室规模的实验中测试了将厌氧/缺氧/氧化系统与热化学污泥预处理相结合的新废水处理工艺。在这项研究中，研究了污泥预处理对厌氧/缺氧/有氧环境下过量污泥产生的影响。该系统分两次运行（1和2）。在运行1中，系统作为参考运行，在运行2中，部分混合液经过热化学预处理，然后返回到生物反应器中。在220天的研究期内，发现预处理污泥的平均溶解效率约为35％。运行2中的污泥产率比运行1中的污泥产率低约52％。通过提高生物磷去除率来去除总磷，运行1和运行2的去除效率分别为83-87％和81-83％。运行2中的总氮去除率（79-82％）略高于运行1中的总氮去除率（68-75％）。混合液悬浮固体/混合液挥发性悬浮固体的比率在两次运行后均在78-83％的范围内相同。在7个月内，在pH 11和60摄氏度下进行热化学预处理3小时后，废水水质没有受到明显影响。从本研究得出的结论是，厌氧/缺氧/氧化过程的热化学污泥预处理在减少污泥产生中起重要作用。

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