EFFECT OF MEDIUM AND HIGH MOLECULAR WEIGHT POLYACRYLAMIDE ON PERFORMANCE OF SLUDGE ANAEROBIC DIGESTION

WANG Xu-dong; LI Xian-guo; ZHANG Hai-qing; PAN Kang-hong; ZHANG Da-hai

doi:10.13205/j.hjgc.202205012

Volume 40 Issue 5

Jul. 2022

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WANG Xu-dong, LI Xian-guo, ZHANG Hai-qing, PAN Kang-hong, ZHANG Da-hai. EFFECT OF MEDIUM AND HIGH MOLECULAR WEIGHT POLYACRYLAMIDE ON PERFORMANCE OF SLUDGE ANAEROBIC DIGESTION[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(5): 82-87. doi: 10.13205/j.hjgc.202205012

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EFFECT OF MEDIUM AND HIGH MOLECULAR WEIGHT POLYACRYLAMIDE ON PERFORMANCE OF SLUDGE ANAEROBIC DIGESTION

doi: 10.13205/j.hjgc.202205012

College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China

Received Date: 2021-08-25
Available Online: 2022-07-02

Abstract

Abstract

Dehydration and successive anaerobic digestion are widely used for the reduction and resource utilization of the excess sludge from municipal wastewater treatment plants. Cationic polyacrylamide(cPAM) is a commonly used flocculant in the dehydration process, and its influence on the performance of subsequent anaerobic digestion is still not well understood. This study found that cPAM with medium and high molecular weight could inhibit the solubilization and hydrolysis of organic matter, and the efficiency of the subsequent acidogenesis and methanogenesis during anaerobic digestion. In addition, the inhibition effect of medium molecular weight cPAM was stronger. Compared with the control, the maximum yields of soluble protein, polysaccharide, and short-chain fatty acids(SCFAs) decreased by 22.3%, 28.4% and 38.6%, respectively, for the digestion of sludge after the addition of medium molecular weight cPAM; while they declined by 7.4%, 19.4% and 25.9% respectively for high molecular weight cPAM. The 30-day cumulative methane production for sludge digestion with medium and high molecular weight cPAM were(40.4±1.4) mL CH₄/g VSS and(49.8±1.3) mL CH₄/g VSS, respectively, which were 33.7% and 18.3% lower than that of the control. The results suggested that the effect of cPAM, including the amount and molecular weight of cPAM, on the performance of subsequent anaerobic digestion should be integrated into consideration in the process of excess sludge dewatering to achieve the best overall benefit.
- excess sludge,
- anaerobic digestion,
- methanogenesis,
- medium & high molecular,
- polyacrylamide

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References(30)

References

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