Kim Seungsoo, Reza Arif, Shim Soomin, Won Seunggun, 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). 2021 Jan 26;11(2):311. doi: 10.3390/ani11020311.
In this study, an attempt was made to develop a real-time control strategy using oxidation-reduction potential (ORP) and pH (mV) time profiles for the efficient operation of bio-liquor circulation system (BCS) in swine farms and its effectiveness in reducing odor emission through improving manure properties in the slurry pit was evaluated. The lab-scale BCS used in this study comprised a bioreactor and a slurry pit. The bioreactor was operated in a sequence of inflow of swine manure ® anoxic phase ® aerobic phase ® circulation to the slurry pit. The improvement in swine manure properties was elucidated by comparing the results of the BCS slurry pit (circulation type, CT) and conventional slurry pit (non-circulation type, NCT). The results revealed that the ORP time profile successfully detected the nitrate knee point (NKP) in the anoxic phase. However, it was less stable in detecting the nitrogen break point (NBP) in the aerobic phase. The pH (mV) time profile showed a more efficient detection of NBP. Compared to the NCT slurry pit, concentrations of ammonium nitrogen (NH-N) and soluble total organic carbon (STOC) and other analyzed swine manure properties were much lower in the CT slurry pit. In the aspect of odor reduction, around 98.3% of NH was removed in the CT slurry pit. The real-time controlled BCS can overcome the drawbacks of fixed time-based BCS operation and therefore can be considered as a useful tool to reduce odor emission from intensive swine farming operations. However, further studies and refinement in control algorithms might be required prior to its large-scale application.
在本研究中，尝试开发一种利用氧化还原电位（ORP）和pH（mV）时间曲线的实时控制策略，以实现猪场生物液循环系统（BCS）的高效运行，并评估其通过改善粪坑中粪便特性来减少气味排放的效果。本研究中使用的实验室规模的BCS包括一个生物反应器和一个粪坑。生物反应器按照猪粪流入→缺氧阶段→好氧阶段→循环至粪坑的顺序运行。通过比较BCS粪坑（循环型，CT）和传统粪坑（非循环型，NCT）的结果，阐明了猪粪特性的改善情况。结果表明，ORP时间曲线成功检测到了缺氧阶段的硝酸盐拐点（NKP）。然而，它在检测好氧阶段的氮断点（NBP）时不太稳定。pH（mV）时间曲线显示对NBP的检测更有效。与NCT粪坑相比，CT粪坑中铵态氮（NH-N）和可溶性总有机碳（STOC）的浓度以及其他分析的猪粪特性要低得多。在减少气味方面，CT粪坑中约98.3%的NH被去除。实时控制的BCS可以克服基于固定时间的BCS运行的缺点，因此可以被视为减少集约化养猪场气味排放的有用工具。然而，在其大规模应用之前，可能需要进一步的研究和控制算法的优化。
