Abstract
In this study, marine sediment (MS) was successfully used as a source of methanogenic bacteria for the anaerobic digestion (AD) of chicken manure (CM). Using MS showed high production in liquid and semi-solid conditions. Even in solid conditions, 169.3 mL/g volatile solids of chicken manure (VS-CM) was produced, despite the accumulation of ammonia (4.2 g NH3-N/kg CM). To the best of our knowledge, this is the highest methane production from CM alone, without pretreatment, in solid conditions (20%). Comparing MS to Ozouh sludge (excess activated sewage sludge) (OS), using OS under semi-solid conditions resulted in higher methane production, while using MS resulted in more ammonia tolerance (301 mL/gVS-CM at 8.58 g NH3-N/kg). Production optimization was carried out via a response surface methodology (RDM) model involving four independent variables (inoculum ratio, total solid content, NaCl concentration, and incubation time). Optimized methane production (324.36 mL/gVS-CM) was at a CM:MS ratio of 1:2.5 with no NaCl supplementation, 10% total solid content, and an incubation time of 45 days.
Highlights
Introduction published maps and institutional affilPoultry production is one of the fastest growing industries worldwide
Variable levels of methane production from chicken manure (CM) using Marine sediment (MS) as an inoculum were recorded, and the results showed successful methane production under mesophilic
High methane yield (305 mL/g volatile solids of chicken manure (VS-CM)) and a final ammonia accumulation as low as 0.78 g NH3-N/kg CM were obtained at CM:MS (1:10)
Summary
Poultry production is one of the fastest growing industries worldwide. Global poultry production exceeds 130 million tons per year, and increases annually [1]. Every 1000 birds produce approximately 1.2 tons of manure. With around 7 batches per year, 20,000 tons of manure are produced every year [2]. Uric acid and 30% undigested protein) along with considerable amounts of phosphorus and potassium [3]. The main method of chicken manure disposal is its use as a fertilizer
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