含固率对超声联合热碱预处理及厌氧消化的影响

摘要

含固率是影响污泥预处理效果的重要因素.对含固率为1.5％、5％、10％的污泥进行超声联合热碱预处理及厌氧消化,以探究含固率对污泥破解效果及产气量的影响,发现VSS的减少率和氨氮的增长率随污泥含固率的提高而减小.厌氧消化27d后,经预处理作用后污泥的含固率为1.5％、5％、10％,VSS浓度较原泥依次减少了64.5％、54.6％、20.1％,氨氮浓度较原泥依次增加了97.3％、47.5％、25.6％,厌氧消化产气量较原泥分别增加了32.0％、40.1％、18.9％,且产气量均在第20天之前便达到了原泥30 d的总产气量.综合考虑污泥体积、总减量效果以及产气量,采用含固率5％的污泥进行预处理以及后续的厌氧消化过程更合适.%Solid concentration is a key factor affecting the sludge performance of pretreatment.Through the combined pretratment by ultrasound,thermal and alkali and the following anaerobic digestion,the influence of solid concentration of 1.5％,5％ and 10％ on the disintegration effect and gas production was explored.The results showed that,with the increase of solid content of the sludge,the reduction rate of VSS and the growth rate of ammonium decreased.After 27 days of anaerobic digestion,VSS concentration of the treated sludge with solid content of 1.5％,5％ and 10％ reduced by 64.5％,54.6％,20.1％,ammonium concentration increased by 97.3％,47.5％,25.6％,and gas production rose by 32.0％,40.1％,18.9％ respectively,compared with the original sludge.Gas production of the treated sludge for 20 days was equal to the original sludge for 30 days.Based on the comprehensive consideration of sludge volume,total disintegration effect and gas production,the sludge with solid content of 5％ was recommended for the pretreatment and subsequent anaerobic digestion.