无机-有机及物理-化学复合调理对厌氧消化污泥脱水性能的影响

Inorganic-organic and physical-chemical co-conditioning on dewaterability of anaerobic digested sludge

厌氧消化是常用的污泥稳定化处理方法,但污泥经厌氧消化处理后脱水性能恶化。分别用无机-有机复合调理剂和物理-化学复合调理剂对厌氧消化污泥进行调理,考察不同调理方法对污泥脱水性能的影响。结果表明,聚合氯化铝(PAC)、聚合硫酸铁(PFS)和阳离子聚丙烯酰胺(PAM)对厌氧消化污泥的调理效果有限,最优条件下污泥比阻(SRF)分别下降了66.3%、89.2%和67.1%;PAC-PAM复合调理和PFS-PAM复合调理对厌氧消化污泥的调理效果较单种调理剂好,最优条件下SRF分别下降了98.2%和97.6%;稻壳、木屑和草木灰与PAM复合调理对厌氧消化污泥的调理效果较单种调理剂好,最优条件下SRF分别下降了97.3%、97.3%和97.7%。

Anaerobic digestion is a common method for sludge stabilization. However, the dewaterability of sludge deteriorates after anaerobic digestion. This study investigated the effects of inorganic-organic and physical- chemical conditioners on the dewaterability of anaerobic digested sludge. The results indicate that the specific re- sistance to filtration （SRF） of polymeric aluminum chloride （ PAC）, polymeric ferric sulfate （ PFS）, or cationic polyacrylamide （PAM） conditioners （individually） on the dewaterability of anaerobic digested sludge were 66.3% , 89.2% , and 66.3% , respectively, after optimization, which was not significant. The co-conditioning effects of PAC-PAM and PFS-PAM were better than that of a single conditioner. The SRF reduction rates of anae- robic digested sludge conditioned by PAC-PAM and PFS-PAM were 98.2% and 97.6% , respectively, after opti- mization. Furthermore, the co-conditioning effects of rice husks, sawdust, and plant ash combined with PAM were better than that of a single conditioner. The SRF reduction rates could reach 97.3% , 97.3%, and 97.7% , respectively, in optimal conditions.