Enhanced Dewatering of Activated Sludge by Skeleton-Assisted Flocculation Process

Jiahua Xia, Ting Rao, Juan Ji, Bijuan He, Ankang Liu and Yongjun Sun
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Jiahua Xia: Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China
Ting Rao: Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China
Juan Ji: Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China
Bijuan He: Nanjing Jiangbei New Area Public Utilities Holding Group Co., Ltd., Nanjing 210044, China
Ankang Liu: Nanjing Water Purification Environmental Research Institute Co., Ltd., Nanjing 211100, China
Yongjun Sun: College of Urban Construction, Nanjing Tech University, Nanjing 211800, China

IJERPH, 2022, vol. 19, issue 11, 1-17

Abstract: 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 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 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.

Keywords: sludge conditioning; sludge dewatering; conditioner; fly ash; flocculation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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