Decomposition Analysis of COD and NH₄-N Discharge Reduction of Livestock and Poultry Breeding Industry in China

Abstract:

In order to investigate the emission reduction mechanism for large-scale livestock and poultry breeding industry in China, the structure decomposition analysis model was built, and the total emission reduction effect, the scale effect, the structure effect and the technology effect were analyzed. The results indicate that the total emission reduction effect values of COD and NH₄-N were-10.17% and-9.80% respectively, the absolute values of which were decreasing gradually from 2011 to 2013, indicating a decrease trend of the pollutants discharge but with the yearly declined reduction effect. The scale effect values of COD and NH₄-N were both 0.32%, which implies the scale expansion of breeding restraining the emission reduction. The structural effect value were 0.99% and-1.91% respectively, namely the breeding structure does not promote the COD discharge reduction but benefits NH₄-N discharge reduction. The technology effect values were-11.48% and-8.21% respectively, which means the technology effect is the main driver of COD and NH₄-N discharge reduction, and the technology effect of discharge reduction for pig breeding is the key to the total technology effect; while the technology effect of beef cattle obviously restrains the discharge reduction, it is necessary to promote reduction projects and strengthen their surveillance.

• Periodical: Applied Mechanics and Materials (Volumes 651-653)
• Pages: 1335-1340
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.651-653.1335
• Online since: September 2014
• Authors: Wen Jing Zhang*, Da Ming Wei, Ya Ling Liu, Li Qing Guo, Yue Ying Wu
• Keywords: COD Discharge Reduction, Decomposition Analysis, Livestock, NH₄-N Discharge Reduction, Poultry Breeding Industry

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