title: Enhanced anaerobic treatment of CSTR-digested effluent from chicken manure: The effect of ammonia inhibition.
abstract: The effect of ammonia inhibition was evaluated during the enhanced anaerobic treatment of digested effluent from a 700m(3) chicken-manure continuous stirred tank reactor (CSTR). A 12.3L internal circulation (IC) reactor inoculated with an anaerobic granular sludge and operated at 35±1°C was employed for the investigation. With a corresponding organic loading rate of 1.5-3.5kg-COD/m(3)d over a hydraulic retention time of 1.5d, a maximum volumetric biogas production rate of 1.2m(3)/m(3)d and TCOD (total COD) removal efficiency ranging from 70% to 80% was achieved. However, the continual increase in the influent TAN content led to ammonia inhibition in the methanogenesis system. The SCOD/TAN (soluble COD/total ammonia nitrogen) ratio was presented to be the key controlling factor for the anaerobic treatment of semi-digested chicken manure, and further validation through shock loading and ammonia inhibition experiments was conducted. The threshold value of the SCOD/TAN ratio was determined to be 2.4 (corresponding to a TAN of 1250mg/L) at an influent pH of 8.5-9.
authors: Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution and Resource Reuse, Tongji University, Shanghai 200092, China.
authors: Zhan-Guang
authors: ZG
authors: Liu
authors: Xue-Fei
authors: XF
authors: Zhou
authors: Ya-Lei
authors: YL
authors: Zhang
authors: Hong-Guang
authors: HG
authors: Zhu
mesh_terms: D000641:Ammonia / Q000494:pharmacology*; D000818:Animals; D019149:Bioreactors; D002645:Chickens; D005285:Fermentation / Q000187:drug effects*; D008372:Manure
chemical_list: D008372:Manure; D000641:Ammonia