Abstract
Pig production has greatly contributed to economic development in Vietnam. However, the lack of appropriate management of large amounts of pig manure has caused serious adverse environmental impacts including GHG emissions. To address this challenge, this study explored the potential of biogas production from manure in Hanoi. Through the use of GIS suitability analysis, cluster analysis, and the analytic hierarchy process (AHP) technique, the study first analyzed the spatial distribution of pig farms, identified optimal locations for biogas plants, and evaluated potential benefits of introducing biogas production to satisfy the electricity demand and reduce GHG emissions. The results show that it is possible to optimally install two biogas plants with a capacity of more than 1 MW and three with a capacity of more than 250 kW, meeting 1.75% and 0.76% of the electricity demand of Son Tay and Thach That respectively. The study estimated that the implementation of the three proposed scenarios would reduce GHG emissions by 84,777 tons of CO2 eq/year compared to the current situation or baseline scenario. The results open a great opportunity to address local energy security with renewable energy and reduce GHG emissions effectively.
Highlights
Pig production has always been the key and traditional livestock industry in Vietnam
Large-scale pig farms account for 35% of the total pig heads, contributing to 43% of the total production, and this trend is expected to increase in the future [4]
Based on a combination of consultation with those experts and previous studies, Secondly, based on a combination of consultation with those experts and previous studies, we develop we develop the weights for the criteria by making a pairwise comparisons matrix among alternatives the weights for the criteria by making a pairwise comparisons matrix among alternatives for each criterion, for each criterion, normalizing the result matrix, calculating the average value of each row to get the normalizing the result matrix, calculating the average value of each row to get the corresponding rate, corresponding rate, calculating the consistency ratio, and analyzing the consistency of judgments
Summary
Pig production has always been the key and traditional livestock industry in Vietnam. From 2017 to 2018, Vietnam ranked in the top 10 countries in the world in terms of pork production and consumption [1,2]. Pig production in Vietnam is mainly concentrated in the provinces of the Red River. Dong Nai, Hanoi, Bac Giang are the provinces with the highest number of pigs in Vietnam, ranging from 1 to 2 million heads in 2017 [3]. On average, the number of pigs per farm was 2000 [4], in recent years, Vietnam livestock production has rapidly shifted from small-scale livestock production to large-scale concentrated farms. Large-scale pig farms account for 35% of the total pig heads, contributing to 43% of the total production, and this trend is expected to increase in the future [4]
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