Improving disintegration and acidification of waste activated sludge by combined alkaline and microwave pretreatment |
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| Authors: | Qi Yang Jun Yi Kun Luo Xiaoli Jing Xiaoming Li Yang Liu Guangming Zeng |
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| Institution: | 1. College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China;2. School of Environment, Guangxi University, Nanning 530004, PR China;3. Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha 410082, PR China;4. Hunan Engineering Research Center of Urban and Rural Domestic Waste Treatment and Disposal, Changsha 410082, PR China;1. School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China;2. Universtar Science & Technology (Shenzhen) Co., Ltd., Shenzhen, Guangdong, 518057, PR China;3. State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, PR China;1. Department of Biological Environment, Kangwon National University, Chuncheon, Gangwon 200-701, Republic of Korea;2. Department of Environmental Science & Biotechnology, Institute of Energy & Environment, Hallym University, Chuncheon, Gangwon 200-702, Republic of Korea |
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| Abstract: | The individual alkaline or microwave pretreatment has been proved to be effective in disintegration and acidification of waste activated sludge (WAS). In this study, the effects of combined alkaline and microwave pretreatment at different pH and specific energy input (Es) on WAS disintegration were investigated using response surface methodology (RSM). Combined pretreatment achieved disintegration degree (DD) of 65.87% at Es of 38,400 kJ/kg TS and pH 11.0. The ANOVA further demonstrated that pH showed more significant effect on DD than Es. Anaerobic batch experiment results showed that combined pretreatment not only significantly improved volatile fatty acids (VFAs) accumulation but also shortened the time for the highest VFAs accumulation. The maximal VFAs accumulation (1500 mg COD/L) obtained at Es of 28,800 kJ/kg TS and fermentation time of 72 h, which was about two times that of the treatment without microwave (850 mg COD/L) at 96 h. The analysis of VFAs composition showed that the VFAs mainly consisted of acetic and iso-valeric acids, accounting for 57.3–70.1% of total VFAs. |
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