Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China.
Nanjing Water Purification Environmental Research Institute Co., Ltd., Nanjing 211100, China.
Int J Environ Res Public Health. 2022 May 27;19(11):6540. doi: 10.3390/ijerph19116540.
Sludge dewatering is the fundamental process of sludge treatment. Environmentally friendly and efficient sludge conditioning methods are the premises of sludge to achieve dehydration reduction and resource utilization. In response to sewage plant sludge dehydration, fly ash (FA), polymerized aluminum chloride (PAC), and polymer sulfate (PFS) were studied separately to determine their sludge dehydration performance, and the effects of these three conditioner composite regulations on sludge dehydration properties were studied. Compared to the sludge treated only with conditioner, the average particle size of floc increased and the organic matter content in the filtrate decreased. The sludge dewatering efficiency after the conditioning effect is better than that after conditioning a single conditioner. After PFS conditioning with fly ash, the water content and specific resistance (SRF) of the sludge cake can be reduced to 76.39% and 6.63 × 10 m/kg, respectively. The moisture content and specific resistance (SRF) of the sludge cake can be reduced to 76.10% and 6.91 × 10 m/kg, respectively. The pH of the sludge and filtrate changed slightly after PAC conditioning with fly ash coupling. These results indicate that fly-ash coupled with PAC and fly-ash coupled with PFS are expected to become a novel and effective environmental protection combined conditioning method for sludge dewatering.
污泥脱水是污泥处理的基本过程。环保、高效的污泥调理方法是实现污泥脱水减量和资源化利用的前提。针对污水处理厂污泥脱水，分别研究了粉煤灰（FA）、聚合氯化铝（PAC）和聚合硫酸铁（PFS），以确定它们的污泥脱水性能，并研究了这三种调理剂复合调节对污泥脱水性能的影响。与仅用调理剂处理的污泥相比，絮体的平均粒径增大，滤液中的有机物含量减少。调理效果后的污泥脱水效率优于单一调理剂的调理效果。粉煤灰对 PFS 进行调理后，污泥饼的含水率和比阻（SRF）可分别降低至 76.39%和 6.63×10^m/kg。粉煤灰与 PAC 耦合调理后，污泥和滤液的 pH 值变化较小。这些结果表明，粉煤灰与 PAC 耦合以及粉煤灰与 PFS 耦合有望成为一种新型有效的环保联合调理污泥脱水的方法。
