EFFECTS OF PROPERTIES AND STRUCTURE OF POLYACRYLAMIDE ON SLUDGES CONDITIONING AND DEWATERING PERFORMANCE BEFORE AND AFTER ANAEROBIC DIGESTION

REN Yuqing; WU Wei; WEI Haijuan; ZHOU Bin; XING Yunxin; HE Kankan; ZHOU Zhen

doi:10.13205/j.hjgc.202308008

Volume 41 Issue 8

Aug. 2023

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2023 > 41(8): 57-64

REN Yuqing, WU Wei, WEI Haijuan, ZHOU Bin, XING Yunxin, HE Kankan, ZHOU Zhen. EFFECTS OF PROPERTIES AND STRUCTURE OF POLYACRYLAMIDE ON SLUDGES CONDITIONING AND DEWATERING PERFORMANCE BEFORE AND AFTER ANAEROBIC DIGESTION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 57-64. doi: 10.13205/j.hjgc.202308008

Citation:

REN Yuqing, WU Wei, WEI Haijuan, ZHOU Bin, XING Yunxin, HE Kankan, ZHOU Zhen. EFFECTS OF PROPERTIES AND STRUCTURE OF POLYACRYLAMIDE ON SLUDGES CONDITIONING AND DEWATERING PERFORMANCE BEFORE AND AFTER ANAEROBIC DIGESTION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 57-64. doi: 10.13205/j.hjgc.202308008

Citation:

REN Yuqing, WU Wei, WEI Haijuan, ZHOU Bin, XING Yunxin, HE Kankan, ZHOU Zhen. EFFECTS OF PROPERTIES AND STRUCTURE OF POLYACRYLAMIDE ON SLUDGES CONDITIONING AND DEWATERING PERFORMANCE BEFORE AND AFTER ANAEROBIC DIGESTION[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 57-64. doi: 10.13205/j.hjgc.202308008

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EFFECTS OF PROPERTIES AND STRUCTURE OF POLYACRYLAMIDE ON SLUDGES CONDITIONING AND DEWATERING PERFORMANCE BEFORE AND AFTER ANAEROBIC DIGESTION

doi: 10.13205/j.hjgc.202308008

1. College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 201306, China;
2. College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;
3. Bailonggang Wastewater Treatment Plant, Shanghai Chengtou Wastewater Treatment Co., Ltd, Shanghai 201203, China;
4. SNF (China) Flocculant Co., Ltd, Shanghai 200040, China

Received Date: 2022-06-17
Available Online: 2023-11-15

Abstract

Abstract

In order to investigate the effects of the property and structure of polyacrylamide (PAM) on sludge dewatering performance, 10 types of common cationic PAM were chosen for the conditioning of mixed sludge (primary and waste sludge) and anaerobically digested sludge. Changes in sludge specific resistance (SRF), capillary water absorption time (CST), particle size, and moisture content of dewatered sludge cake were determined for PAM-conditioned sludge, and then they were coupled with the rheological property to evaluate the conditioning performance and elucidate governing mechanisms. The results showed that the effects of different types of PAMs on the dewaterability of waste sludge and digested sludge were distinct, and the conditioned digested sludge generally obtained better dewatering performance. Both waste sludge and digested sludge achieved the best dewaterability after being conditioned by the PAM with high molecular weight, high charge density and branched chain PAM. At the optimum dosage of 4.0 kg/t DS for the chosen PAM, the SRF, CST, and particle size of the conditioned digested sludge were 0.64×10¹² m/kg, 18.6 s, and 400.5 μm, and the moisture content of dewatered sludge cake was reduced to 74.8%. Rheological analysis showed that sludge conditioned by the chosen PAM had more obvious thixotropy, larger and denser flocs, higher elasticity modulus, stronger shear resistance, and thus better dewatering performance. The results of this study can provide a theoretical basis and technical reference for conditioner selection for the anaerobically digested sludge in wastewater treatment plants.
- anaerobically digested sludge,
- polyacrylamide (PAM),
- sludge conditioning,
- dewaterability,
- rheology

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References(34)

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