Main content area

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

Wang, Xiaowei, Zhang, Lieyu, Xi, Beidou, Sun, Wenjun, Xia, Xunfeng, Zhu, Chaowei, He, Xiaosong, Li, Mingxiao, Yang, Tianxue, Wang, Pengfei, Zhang, Zhonglei
Bioresource technology 2015 v.180 pp. 192-199
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
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.