AI Article Synopsis
- * Operating at around 35°C, the process achieved a biogas production rate of 1.2m³/m³/d and a total COD removal efficiency of 70% to 80%, despite increasing influent total ammonia nitrogen (TAN) levels.
- * The research identified the SCOD/TAN ratio as a critical factor, determining that a threshold of 2.4 (with a corresponding TAN of 1250mg/L) is necessary for effective treatment at a pH of
Article 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.
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| http://dx.doi.org/10.1016/j.wasman.2011.09.015 | DOI Listing |
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