Abstract:

A novel, economical and applicable equipment, high speed rotary disk (HSRD) was brought forward by the authors based on experimental research.As a physical pretreatment process of excess sludge reduction and resource recovery technology, the solubilization effects of HSRD upon excess sludge were investigated.According to the experimental results, besides grinding and hydrolytic enzyme effects, the fluid shearing force generated by the rotary disk contributed to the solubilization of the sludge.And the shearing force can only be generated by high rotating speed of the rotary disk with high MLSS concentration of the sludge.Moreover, the high solubilization rate (DOC/TOC>50%) could be achieved under the optimum condition: rotating speed 5000 r·min^-1， MLSS of the sludge higher than 18000 mg·L^-1， and treatment time 45 min.

Key words:

剩余污泥, 减量化, 可溶化处理, 高速转盘

摘要：

高速转盘法是作者等开发的一种新型的剩余污泥可溶化处理的物理方法，是一种经济实用的剩余污泥减量化、资源化的前处理工艺。实验采用自制的高速转盘对污泥进行可溶化处理，并对实验过程中污泥的可溶化机制、实验装置的结构及运转参数与污泥可溶化之间的关联特性进行了研究。结果表明：高速转盘所产生的流体剪切力是导致污泥可溶化的主要原因，同时，转盘与定盘之间的研磨作用和水解酶的酶促反应也对污泥可溶化起到了促进作用。研究发现：流体剪切力仅存在于距转盘微小距离的空间内对污泥微生物细胞进行破碎，而且足够大的转盘转速与足够高的污泥MLSS浓度才能产生高效的导致污泥可溶化的流体剪切力。在转盘转速为5000 r·min^-1，污泥MLSS浓度高于18000 mg·L^-1，处理45 min时，污泥的可溶化率(DOC/TOC)达50%以上。

关键词:

剩余污泥, 减量化, 可溶化处理, 高速转盘