Abstract
This study tested the effect on thermophilic and mesophilic digestion of poultry manure (PM) or treated poultry manure (TPM) by the addition of agriculture wastes (AWS) as a co-substrate under dry conditions. PM was co-digested with a mixture of AWS consisting of coconut waste, cassava waste, and coffee grounds. Results were increased methane content in biogas, with decreased ammonia accumulation and volatile acids. The highest performance occurred under mesophilic conditions, with a 63 and 41.3% increase in methane production from addition of AWS to TPM (562 vs. 344mLg VS(-1) from control) and PM (406 vs. 287mLg VS(-1) from control), respectively. Thermophilic conditions showed lower performance than mesophilic conditions. Addition of AWS increased methane production by 150 and 69.6% from PM (323.4 vs. 129mLg VS(-1) from control) and TPM (297.6 vs. 175.5mLg VS(-1) from control), respectively. In all experiments, 100% acetate produced was degraded to methane. Maximum ammonia accumulation was lowered to 43.7% by mixing of AWS (range 5.35-8.55 vs. 7.81-12.28g Nkg(-1) bed). The pH was held at 7.3-8.8, a range suitable for methanogenesis.
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