Study of bioleaching under different hydraulic retention time for enhancing the dewaterability of digestate
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- 作者：Linshuai Li ; Jingqing Gao ; Songfeng Zhu…
- 关键词：Kitchen waste digestate ; Bioleaching ; Plug ; flow bioreactor ; Hydraulic retention time ; Dewatering
- 刊名：Applied Microbiology and Biotechnology
- 出版年：2015
- 出版时间：December 2015
- 年：2015
- 卷：99
- 期：24
- 页码：10735-10743
- 全文大小：1,029 KB
- 参考文献：APHA (2005) Standard methods for the examination of water and wastewater, 21st edn. APHA, Washington, DC
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Jingqing Gao (1)
Songfeng Zhu (1)
Yonghong Li (2)
Ruiqin Zhang (1)
1. Research Institute of Environmental Sciences, College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou, 450001, China
2. School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Biotechnology
Microbiology
Microbial Genetics and Genomics - 出版者：Springer Berlin / Heidelberg
- ISSN：1432-0614
文摘
Dewatering of kitchen waste digestate is a key problem to solve so as to increase the application of kitchen waste after anaerobic digestion. In this study, the effects of bioleaching under different hydraulic retention time (HRT = 2, 2.5, and 3 days) on dewaterability of kitchen waste digestate were evaluated. A 12-stage plug flow bioreactor with 180 L working volume was used for digestate bioleaching. The bioleached digestate under different HRTs were collected and dewatered by plate-and-frame filter press. The results showed that the moisture contents of digestate cakes were 67.87 % at 2 days of HRT, 58.06 % at 2.5 days of HRT, and 54.45 % at 3 days of HRT, respectively, indicating the longer the HRT, the lower the moisture content of filter cake. Balanced between the cost and practical need, 2.5 days can be used as the HRT in engineering application. Under the condition of HRT of 2.5 days, the pH, specific resistance to filtration (SRF), capillary suction time (CST), and sedimentation rate of digestate changed from the initial values of 8.08, 210.6 s, 23.4 × 1012 m kg? and 10 % to 3.21, 32.7 s, 2.44 × 1012 m kg? and 76.8 %, respectively. Based on the observations above, the authors conclude that bioleaching technology is an effective method to enhance digestate dewaterability and reduce the cost of subsequent reutilization. Keywords Kitchen waste digestate Bioleaching Plug-flow bioreactor Hydraulic retention time Dewatering