絮凝剂聚丙烯酰胺对高固体污泥厌氧消化的影响

Effect of Flocculant Polyacrylamide on Anaerobic Digestion of High Solid Sludge

以高固污泥为研究对象,探究了聚丙烯酰胺(PAM)对高固污泥厌氧消化产气的影响。实验结果表明,低浓度的PAM对污泥消化影响不明显,但当PAM质量浓度(以总固体SS计)超过20 g/kg时,PAM的存在会严重抑制污泥消化,并且当PAM的质量浓度由20 g/kg增加至80 g/kg时,污泥的最大甲烷产量(以VSS计)由184.4 m L/g下降至72.9 m L/g,溶解性化学需氧量(SCOD)最大质量浓度由20.1 g/L下降至8.5g/L。PAM的存在增加了分子间的团聚性,进而减少了发酵微生物与消化基质的接触。

The effect of polyacrylamide （PAM） on the anaerobic digestion gas production of high solid sludge was studied with high solid sludge as the research object. Results showed that the effect of low concentration of PAM on sludge digestion was not obvious. However, when PAM content exceeded 20 g/kg suspended solid, the presence of PAM could seriously inhibit the anaerobic digestion of sludge, and with the level of PAM increased from 20 to 80 g/kg, the maximum yield of methane decreased from 184.4 mL/g to 72.9 mL/g volatile suspended sol- ids, and the maximum content of soluble chemical oxygen demand decreased from 20.1 g/L to 8.5 g/L. The presence of PAM increased the intermolecular agglomeration and thus reduced the contact of the fermenting microorganisms with the digestive matrix.