Journal of the Society of Agricultural Structures, Japan

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The purpose of this study was to assess environmental impacts from livestock manure and dairy wastewater treatment systems utilizing public sewerage system at dairy farm has 150 dairy cows, using life cycle assessment. The scenario for treating solid waste was composting (Cp) system. The purification (Pf) system and feces-and-urine separate (Se) system was the scenario of using on-site purification facilities. The bedding material (Bp) processing system and the methane fermentation (Mf) system, of the on-site, were the scenarios involving a public sewage system for purifying liquid waste. The amount of manure and wastewater was estimated from 150 head dairy farm with free-stall barn and milking parlor, and lactation ability of dairy cow. The functional unit for evaluating each scenario was to treat the manure and wastewater from the dairy farm for an entire year. The system boundary included the construction and installation stage of facilities and the operation stage. We assessed the impact of global warming, acidification, and eutrophication from the results of the life cycle inventory analysis. The impact of global warming and acidification at the Pf and Bp system was the largest at the construction and installation stage, and it was two times larger than the Se system with a simple facility. At the operation stage, the global warming impact from the Mf system decreased 15 % compared with the Se system. The eutrophication impact was lower at the two scenarios, the Bp system and the Mf system, because of utilizing the public sewerage system for purifying liquid waste. The dairy manure and wastewater treatment system utilizing the public sewerage system has a potential for mitigating global warming and eutrophication impact compared with the system including on-site purification processes.

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