研究了聚丙烯酰胺(PAM)、高铁酸钾和硅藻土联合作用对污泥脱水性能的影响。通过曲面响应优化,建立了以污泥比阻(SRF)为脱水效率的二次多项式预测模型和方差分析,得到三因素耦合调理污泥最优值。结果表明,高铁酸钾、PAM和硅藻土的投加量分别为100.52、4.34、201.16 kg/t DS的条件下处理的污泥脱水性能最佳,SRF最低可达到5.82×10¹² m/kg。后续分析表明,高铁酸钾强氧化性使胞外聚合物(EPS)遭到破坏,释放结合水。在PAM的絮凝作用下,泥水快速分离,硅藻土充当骨架作用,架起排水通道,大幅度提升了污泥的脱水性能。

The effect of the united action of polyacrylamide,potassium ferrate and diatomite together on sludge's dehydration performance is studied.A quadratic polynomial prediction model and variance analysis is established with sludge's specific resistance to filtration (SRF) as sludge's dehydration efficiency are established through surface response optimization,and the optimal values for three factors coupling in conditioning sludge are obtained.The dehydration performance of sludge achieves the best when the dosage of potassium ferrate,polyacrylamide and diatomite are 100.52 kg/t DS,4.34 kg/t DS and 201.16 kg/t DS,respectively,and the lowest SRF can reach 5.82×10¹² m·kg^-1.It is shown from subsequent analysis that potassium ferrate,by the strong oxidation ability,destroys extracellular polymers and make it release bound water.Under the flocculation of polyacrylamide,mud and water are quickly separated,diatomite acts as a skeleton and sets up a drainage channel,which greatly improves the dehydration performance of sludge.

刘浩(1977-),男,博士,研究员,研究方向为环境工程,liuhaocom@163.com