Kim Seungsoo, Shim Soomin, Won Seunggun, Kwag Junghoon, Ra Changsix
Department of Animal Industry Convergence, College of Animal Life Sciences, Kangwon National University, Chuncheon 24341, Korea.
Department of Animal Resources, College of Life and Environmental Science, Daegu University, Gyeongsan 38453, Korea.
Animals (Basel). 2022 Oct 26;12(21):2941. doi: 10.3390/ani12212941.
The livestock industry, especially swine production, has been pressurized by vicinity complaints about odor in Korea. Therefore, a lot of effort has been undertaken regarding reducing the odor emissions from pigsties, widely carried out and the washing out manure in slurry pit by liquid-phase compost has particularly been spotlighted with outstanding performance of odor reduction. However, such a washing out manure called bio-liquor circulation system (BCS) has been controlled by a timer with designated reaction time, which cannot guarantee the system performance. This research proposes an effective real-time control technology for BCS, which circulates bio-liquor to the slurry pit of swine barns. The real-time control system was operated through accurate detection of the designated control points on the oxidation reduction potential (ORP) and pH time profiles for the nitrate knee point (NKP) and nitrogen break point (NBP) in anoxic and aerobic conditions with 100 and 99.6% performances, respectively. The duration of the anoxic and aerobic phases was also automated and noticeably lowered the concentration of nutrients in the manure in the slurry-pit, which served as a source of malodor. The real-time control strategy may be an innovative way to reduce odor and simultaneously produce liquid fertilizer, and provides a reference for the optimization of the industrial scale.
在韩国，畜牧业，尤其是养猪业，因周边居民对气味的投诉而面临压力。因此，人们在减少猪舍气味排放方面付出了诸多努力，相关举措广泛实施，其中通过液相堆肥冲洗粪坑以减少气味的效果尤为显著。然而，这种被称为生物液循环系统（BCS）的冲洗粪便方式一直由定时器控制指定的反应时间，无法保证系统性能。本研究提出了一种针对BCS的有效实时控制技术，该技术可将生物液循环至猪舍的粪坑。实时控制系统通过在缺氧和好氧条件下分别对氧化还原电位（ORP）和pH时间曲线的指定控制点进行准确检测来运行，以确定硝酸盐拐点（NKP）和氮断点（NBP），性能分别达到100%和99.6%。缺氧和好氧阶段的持续时间也实现了自动化，显著降低了粪坑中粪便的养分浓度，而这些养分是恶臭的来源。实时控制策略可能是一种减少气味并同时生产液体肥料的创新方法，为工业规模的优化提供了参考。
