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Biogas production improvement and C/N control by natural clinoptilolite addition into anaerobic co-digestion of Phragmites australis, feces and kitchen waste

Author:
Wang, Xiaowei, Zhang, Lieyu, Xi, Beidou, Sun, Wenjun, Xia, Xunfeng, Zhu, Chaowei, He, Xiaosong, Li, Mingxiao, Yang, Tianxue, Wang, Pengfei, Zhang, Zhonglei
Source:
Bioresource technology 2015 v.180 pp. 192-199
ISSN:
0960-8524
Subject:
Phragmites australis, acetic acid, acidification, anaerobic digestion, bentonite, biogas, butyric acid, carbon nitrogen ratio, diatomaceous earth, equations, feces, kitchen waste, methane, methane production, nitrogen, pH, propionic acid, zeolites
Abstract:
Anaerobic co-digestion (A co-D) performance of Phragmites australis, feces and kitchen waste with addition of clinoptilolite (one main kind of zeolite) was investigated to evaluate the improvement of biogas/methane production and internal mechanism of nitrogen and organics control. A better biogas/methane production was observed by 10% clinoptilolite (v/v) than bentonite and diatomite, with the shortest lag phase of 0.070dāˆ’1, the max rate of 15.89L/(kgVSday) and ultimate biogas production of 308.2L/kgVS as the modified Gompertz equation predicted. Accordingly, the content of methane in the biogas was increased from 44.10% to 65.30%. Furthermore, the clinoptilolite inhibited the acidification of digestion liquid (optimum pH 7.0ā€“7.5) and enhanced the VFAs (acetic acid, propionic acid and butyric acid) destruction. Moreover, 10% of clinoptilolite optimally enhanced the microbial utilization of Ca2+/Mg2+, controlled the C/N ratio, and improved the biogas production as well as NH3-N/NO3-N inhibition efficiency.