Effect of Adding Drinking Water Treatment Sludge on Excess Activated Sludge Digestion Process

Yanxia Wu, Haixia Du, Fusheng Li, Haoning Su, Sartaj Ahmad Bhat, Hudori Hudori, Maulana Yusup Rosadi, Faisal Arsyad, Yanqiu Lu and Huifang Wu
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Yanxia Wu: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Haixia Du: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Fusheng Li: River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Haoning Su: Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Sartaj Ahmad Bhat: River Basin Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Hudori Hudori: Graduate School of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Maulana Yusup Rosadi: Graduate School of Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Faisal Arsyad: Graduate School of Natural Science and Technology, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
Yanqiu Lu: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China
Huifang Wu: College of Urban Construction, Nanjing Tech University, Nanjing 211816, China

Sustainability, 2020, vol. 12, issue 17, 1-15

Abstract: Drinking water treatment sludge (DWTS) is a waste by-product from water treatment plants where aluminum and iron salts are the most commonly used coagulants. DWTS was reused to investigate the effects of DWTS on the digestion liquid quality and microorganism activity of excess activated sludge (EAS). DWTS with four suspended solid (SS) concentrations (0%, 2%, 5% and 10%) was added to EAS which was sampled during aerobic and anaerobic digestion processes, then batch tests were carried out which followed the coagulation-flocculation process. It was found that DWTS can improve total dissolved nitrogen (TDN) and dissolved phosphorus (DP) removal efficiencies for anaerobic EAS. The highest removal efficiency of TDN (29.97%) as well as DP (55.38%) was observed when DWTS dosage was SS = 10%. The release of dissolved organic matter (DOM) by DWTS could increase dissolved organic carbon (DOC) concentration and lead to the accumulation of non-biodegradable humic acid-like substance in aerobic and anaerobic digestion liquid. The dehydrogenase activity (DHA) values of anaerobic EAS were higher than aerobic EAS. DWTS could reduce DHA for both EAS. These results indicate that potential risk of release of DOM should be considered when reusing DWTS in future research.

Keywords: aerobic digestion; anaerobic digestion; dissolved organic matter; drinking water treatment sludge; excess activated sludge (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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