摘要
以城市污水厂剩余活性污泥为对象,研究在不同碱解药剂和剂量以及不同水热预处理温度和水热时间下"碱解+低温水热预处理"的破胞效果。通过对预处理泥样进行中温((35±1)℃)厌氧消化生物化学甲烷势(biochemical methane potential,BMP)实验来评价该预处理工艺对中温厌氧消化性能的影响。实验结果表明,SCOD的溶出效果及VSS的减量化程度随着加碱剂量、水热温度的增加而呈现先升高后略有下降的趋势,且在碱解条件为0.05 g NaOH/g TS和水热条件为70℃、9 h时的预处理条件下破胞效果最为显著;在该预处理条件下,SCOD的溶出率可达52.3%,VSS的降解率达到33.3%。BMP实验结果显示,在最佳预处理条件下,与对照组相比,TCOD去除率提高了77.1%,甲烷产气量是对照组的2.7倍,甲烷产气率可达354 mL CH4/g VS。
Disintegration of the waste activated sludge( WAS) of a municipal wastewater treatment plant using alkaline-low temperature thermal pretreatment with different kinds and doses of alkaline at a series of pretreatment temperatures and thermal reaction times were investigated. The effect of alkaline-thermal pretreatment on anaerobic digestion was investigated by mesophilic(( 35 ± 1) ℃) biochemical methane potential( BMP) test.The results showed that the SCOD release efficiency and the VSS reduction efficiency increased and then decreased with increased alkaline dose and thermal temperature. The optimal pretreatment conditions were 0. 05 g NaOH /g TS at 70℃ for 9 h. Under the conditions,the SCOD release efficiency was 52. 3%,the VSS reduction efficiency reached 33. 3%. The BMP experiment results showed that the TCOD removal efficiency increased to77. 1%,which was significantly higher than the control group. While,the methane production was 2. 7 times as many as the control group. The biogas production rate was 354 mL CH4/g VS under the optimal pretreatment conditions.
引文
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