Real-time control of an immobilized-cell reactor for wastewater treatment using ORP.
Real-time control of an immobilized-cell reactor for wastewater treatment using ORP.
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DOI：
10.1016/s0043-1354(01)00201-9
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发表时间：
2002
期刊：
影响因子：
12.8
通讯作者：
Kuo-cheng Chen;Ching-Yen Chen;Juin-wei Peng;J. Houng
中科院分区：
文献类型：
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作者：
Kuo-cheng Chen;Ching-Yen Chen;Juin-wei Peng;J. Houng
研究了固定化细胞反应器在实时供氧控制下间歇曝气（IA）工艺对模拟废水同时脱氮除碳的性能。在操作期间监测氧化还原电位（ORP）。ORP-时间曲线显示出独特的转折点，这与系统化学和生物活性的变化直接相关。反应器运行初期采用定时曝气-不曝气的循环运行方式，随后采用ORP设定值实时控制技术。采用沿着ORP曲线斜率的移动窗口来搜索曝气循环的硝酸盐断点。一旦发现断点，将反应器通气固定时间。处理过程在实时控制下，可有效避免缺氧发酵状态。循环时间减少了约30%。综合考虑COD和总氮的去除效果，曝气时间以3 h为宜。实时控制系统不仅比定时控制系统具有更好的脱氮效果，而且在HRT从3 h到8 h的变化过程中，出水水质稳定。良好的操作稳定性被证明，即使当进水负荷发生非常高的扰动。
The performance of an immobilized-cell reactor for simultaneous carbon–nitrogen removal in synthetic wastewater with an intermittent aeration (IA) process under real-time control of oxygen supply was investigated. The oxidation–reduction potential (ORP) was monitored during operation. The ORP–time profile showed distinctive turning points, which directly correlated with the changes in the system chemistry and biological activity. The reactor was conducted by cyclic fixed-time aeration–nonaeration operation at the beginning, followed by real-time control technology using ORP setpoint. A moving window along the slope of the ORP curve was employed to search for the nitrate breakpoint of the aeration cycle. Once the breakpoint was found, the reactor was aerated for a fixed period. The treatment process could effectively avoid the anoxic fermentation state under the real-time control. The cycle time was reduced around 30%. The duration of aeration period was found to be optimum at 3h under the consideration of the removal efficiencies of COD and total nitrogen. The real-time control system not only exhibited a better nitrogen removal efficiency than the fixed-time control operation, but it also showed a stable effluent quality during the change of HRT from 3 to 8h. Good operation stability was demonstrated even when a very high disturbance of the influent loading occurred.