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J Environ Sci (China)

Title:		Potassium ferrate pretreatment promotes short chain fatty acids yield and antibiotics reduction in acidogenic fermentation of sewage sludge
Author(s):		Qiao Z; Xu S; Zhang W; Shi S; Zhang W; Liu H;
Address:		"School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China. Electronic address: xusy@usst.edu.cn. Centillion Resource Recycling (Wuxi) Co. Ltd., Wuxi 214000, China. School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai 200093, China. Electronic address: Liuhb@usst.edu.cn"
Journal Title:		J Environ Sci (China)
Year:		2022
Volume:		20220110
Issue:
Page Number:		41 - 52
DOI:		10.1016/j.jes.2022.01.001
ISSN/ISBN:		1001-0742 (Print) 1001-0742 (Linking)
Abstract:		"During the acidogenic fermentation converting waste activated sludge (WAS) into short-chain fatty acids (SCFA), hydrolysis of complex organic polymers is a limiting step and the transformation of harmful substances (such as antibiotics) during acidogenic fermentation is unknown. In this study, potassium ferrate (K(2)FeO(4)) oxidation was used as a pretreatment strategy for WAS acidogenic fermentation to increase the hydrolysis of sludge and destruct the harmful antibiotics. Pretreatment with K(2)FeO(4) can effectively increase the SCFA production during acidogenic fermentation and change the distribution of SCFA components. With the dosage of 0.2 g/g TS, the maximum SCFA yield was 4823 mg COD/L, which is 28.3 times that of the control group; acetic acid accounts for more than 90% of the total SCFA. The higher dosage (0.5 g/g TS) can further increase the proportion of acetic acid, but inhibit the overall performance of SCFA production. Apart from the promotion of hydrolysis and acidogenesis, K(2)FeO(4) pretreatment can also simultaneously oxidizes and degrades part of the antibiotics in the sludge. When the dosage is 0.5 g/g TS, the degradation efficacy of antibiotics is the most significant, and the contents of ofloxacin, azithromycin, and tetracycline in the sludge are reduced by 69%, 42%, and 50%, respectively. In addition, K(2)FeO(4) pretreatment can also promote the release of antibiotics from sludge flocs, which is conducive to the simultaneous degradation of antibiotics in the subsequent biological treatment process"
Keywords:		"*Anti-Bacterial Agents Fatty Acids, Volatile/metabolism Fermentation Iron Compounds Potassium Compounds *Sewage Acidogenic fermentation Antibiotics Oxidation pretreatment Potassium ferrate Sewage sludge Volatile fatty acids;"
Notes:		"MedlineQiao, Zihao Xu, Suyun Zhang, Wanqiu Shi, Shuyin Zhang, Wei Liu, Hongbo eng Netherlands 2022/05/28 J Environ Sci (China). 2022 Oct; 120:41-52. doi: 10.1016/j.jes.2022.01.001. Epub 2022 Jan 10"