Effect of Rice Straw on Methane Production Potential of Cow Manure

Abstract

BACKGROUND: Animal manures are one of the biggest sources of greenhouse gases and improper manage-ment of animal wastes contributes to the increasing greenhouse gases in the atmosphere. Con-verting greenhouse gases generated from animal manures to energy is one way of contributing to the net-zero carbon emissions.METHODS AND RESULTS: The potential for methane production from cow manure (CM) was studied by measuring the methane yield using the biochemical methane potential (BMP) test. In particular, the effect of co-digestion using rice straw (RM) on the methane production was studied. The methane yields from the co-digestion of CM and RS were statistically similar to that from the mono-digestion of CM or RS. But there was a synergy effect at the CM:RS ratio of 1:2 and 1:1. This can be attributed to the increased C/N ratio. The changed microbial community structure with the addition of substrates (CM, RS) probably led to the increase in the methane produc-tion. CONCLUSION(S):The methane production potential of the particular CM used in this study was not improved by the addition of RS as a co-substrate. The addition of substrates to the anaerobic sludge promoted the increase in the microbial species having synergetic relationship with methano-gens, and this can partially explain the increase in the methane production with the addition of substrates. Overall, there are needs for further studies to improve the methane yield from CM.

Methane Production from the Co-digestion of Cattle Manure and Agricultural Residues

“…단일 소화 및 병합 소화를 위해 준비한 시료를 이용해 기존 방법을 따라 BMP 실험을 수행하였다 [23,24]. 세럼병(160 mL) 에 혐기성 미생물 영양배지(90 mL)와 혐기성 슬러지(10 mL)…”

“…각 기질의 원소(탄소, 질소, 수소, 산소) 분석 결과를 이용 하여 이론적 메탄 발생량을 산정하였다. 이론적 메탄 발생량 계산은 혐기성 분해를 통해 기질이 메탄, 이산화탄소 및 암모 니아로 분해되는 것을 전제로 하는 양론식(식 1)을 이용하여 수행하였다 [24]. 계산한 이론적 메탄가스 발생량과 실험을 통 해 측정한 최대 메탄 발생량을 이용해 생분해도(biodegrad-…”

Energy Recovery Efficiency of Integrating Anaerobic Co-Digestion of Pig Slurry and Feedlot Cattle Manure and Hydrothermal Carbonization of Anaerobic Sludge Cake

“…AD of FCM requires a prolonged hydraulic retention time (HRT), which leads to the generation of a substantial amount of anaerobic digestion sludge. This necessitates the establishment of a separate sludge treatment system [13,14]. Therefore, in the Republic of Korea, the diversification of livestock manure characteristics and the predominant adoption of wet AD technologies have posed challenges to the expansion of livestock manure energy facilities.…”