Department of Animal Life System, Kangwon National University, Hyoja 2, 192-1 Chunchon 200-701, South Korea.
J Hazard Mater. 2009 Dec 15;172(1):61-7. doi: 10.1016/j.jhazmat.2009.06.133. Epub 2009 Jul 2.
The feasibility of real-time control of the oxic phase using the pH (mV)-time profile in a sequencing batch reactor for swine wastewater treatment was evaluated, and the characteristics of the novel real-time control strategies were analyzed in two different concentrated wastewaters. The nitrogen break point (NBP) on the moving slope change (MSC) of the pH (mV) was designated as a real-time control point, and a pilot-scale sequencing batch reactor (18 m(3)) was designed to fulfill the objectives of the study. Successful real-time control using the developed control strategy was achieved despite the large variations in the influent strength and the loading rate per cycle. Indeed, complete and consistent removal of NH4-N (100% removal) was achieved. There was a strong positive correlation (r(2)=0.9789) between the loading rate and soluble total organic carbon (TOCs) removal, and a loading rate of 100 g/m(3)/cycle was found to be optimum for TOCs removal. Experimental data showed that the real-time control strategy using the MSC of the pH (mV)-time profile could be utilized successfully for the removal of nitrogen from swine wastewater. Furthermore, the pH (mV) was a more reliable real-time control parameter than the oxidation-reduction potential (ORP) for the control of the oxic phase. However, the nitrate knee point (NKP) appeared more consistently upon the completion of denitrification on the ORP-time profile than on the pH (mV)-time profile.
利用序批式反应器中 pH（mV）-时间曲线的斜率变化（MSC）来实时控制好氧阶段的可行性进行了评估，并在两种不同的浓缩废水中分析了新型实时控制策略的特点。将 pH（mV）的斜率变化（MSC）上的拐点（NBP）指定为实时控制点，并设计了一个中试规模的序批式反应器（18 m3）来实现研究的目标。尽管进水浓度和每个周期的负荷率变化很大，但仍成功地利用所开发的控制策略实现了实时控制。事实上，NH4-N 得到了完全和一致的去除（去除率 100%）。负荷率与溶解性总有机碳（TOC）的去除率之间存在很强的正相关关系（r2=0.9789），并且发现 100 g/m3/周期的负荷率最有利于 TOC 的去除。实验数据表明，利用 pH（mV）-时间曲线的 MSC 进行实时控制策略可成功地从猪废水中去除氮。此外，pH（mV）是比氧化还原电位（ORP）更可靠的实时控制参数，可用于控制好氧阶段。然而，在 ORP 时间曲线而不是 pH（mV）-时间曲线上，硝态氮拐点（NKP）似乎更一致地出现在反硝化完成时。
