Ước tính lượng khí mêtan (CH4) phát thải từ quản lý chất thải trong chăn nuôi bò ở tỉnh Thừa Thiên Huế

Abstract

The study aimed to determine the amount of methane (CH₄) emitted from manure management in cattle farm in Thua Thien Hue province. The study was carried out in 20 small and medium-sized cattle farms with a total of 258 cattle. The amount of CH₄ emissions was determined based on data such as waste management, estimated food intake, wastewater characteristics, mineral content in cow manure and coefficients according to IPCC (2019) Tier 2. Research results showed that 100% of households do not apply waste treatment by biogas systems, but mainly in solid storage (SS) and dry lot (DL). The coefficient of CH₄ emission from cattle manure management in SS system is about 2.6 to 3.0 times higher than that of DL management and treatment system, from 1.58 to 5.72 kg CH₄/head/year. The average amount of CH₄ emission from cattle manure is 2.28 kg CH₄/head/year (ranging from 0.50 to 5.90) depending on age and manure treatment system. The COD content in wastewater is four times higher than QCVN 01-150:2017 and the average CH₄ emission form wastewater was 0.20 kg CH4/head/year. The average CH₄ emission from manure and wastewater is 2.48 kg CH₄/head/year (ranging from 1.51 to 3.87 kg CH₄/head/year). With the total herds of cattle in Thua Thien Hue province according to (TCTK, 2021) is 28.356 heads, the CH₄ emissions are approximately 70.2 tons/year, equivalent to 1756 tons CO₂eq/year.