The Effect of Thermal Pretreatment and Retention Time on the Degradation of Waste Activated in Anaerobic Digestion
The Effect of Thermal Pretreatment and Retention Time on the Degradation of Waste Activated in Anaerobic Digestion
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热预处理和停留时间对厌氧消化中活化废物降解的影响
DOI：
10.2965/jswe1978.12.112
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
T. Noike
中科院分区：
文献类型：
--
作者：
Y. Li;T. Noike
在35±1·Ž的条件下，采用实验室间歇试验和连续试验研究了热预处理对厌氧消化废旧活性污泥降解特性的影响。处理温度为62~175.Ž，停留时间分别为15、30、60、90min。通过热处理将有机固体溶解为可溶性蛋白质和碳水化合物或转化为挥发性脂肪酸等低相对分子质量化合物。厌氧生物降解性和甲烷产气量增加，厌氧消化所需的停留时间有可能缩短到10d以下。活性污泥厌氧消化升级的最佳预处理温度为170.Ž，最佳保温时间为60min。在此前处理条件下，停留时间为5.0~10.0d时，COD的去除效率约为60%，产气量为223~235ml·EgCOD-1，约为对照的2倍。热预处理后废弃活性污泥中主要有机物的增溶和厌氧降解率由大到小依次为：碳水化合物、蛋白质和脂肪。在停留时间为1.5~10.0d时，每毫升消化池中存在的产甲烷细菌总数在107~108MPN之间。
The effect of thermal pretreatment on the characteristics of degradation of waste activated sludge in anaerobic digestion was investigated using laboratory-scale batch and continuous experiments at 35±1•Ž. The pretreatment temperature of waste activated sludge ranged from 62 to 175•Ž and the holding time were 15, 30, 60 and 90 minutes. organic solids were solubilizated to soluble proteins and carbohydrates or converted into lower molecular weight compounds such as volatile fatty acid by the thermal pretreatment. The anaerobic biodegradability and methane gas production was increased , and the retention time necessary for anaerobic digestion was possible to be reduced by lower than 10 days . The optimum pretreatment temperature and holding time for the upgrading of anaerobic digestion of waste activated sludge were 170•Ž and 60 minutes respectively . In this pretreament codition, at the retention time from 5.0 to 10.0 days, COD removal efficencies was about 60% and gas production ranged from 223 to 235 ml •EgCOD-1, which was about 2 times that of the control. The rate of increase in solubilization and anaerobic degradation of major organic compounds in waste activated sludge with thermal pretreatment decreased in the following order : carbohydrate > protein> lipid. The number of total methanogenic bacteria existing at retention time from 1.5 to 10.0 days ranged from 107 to 108 MPN per ml of digester content.