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Nitrification Modeling in Pilot-Scale Chloraminated Drinking Water Distribution Systems 中试规模氯胺化饮用水配水系统中的硝化模拟
发布日期: 2004-11-15
本研究的目的是开发一种 模拟和预测化学和生物基础的数学模型 中试规模分配系统中的硝化作用及动力学参数评估 与基本面有关。 在该水域建立了六个中试规模的配水系统 威斯康星大学麦迪逊分校的科学与工程实验室。门多塔湖的水被用作分配的水源 经过常规明矾凝固和过滤处理的系统。 在进入配水系统之前,处理过的门多塔湖的水 氯胺化,使系统末端的氯胺残留在 全尺寸配电系统中的典型水平(即0.5~2.5 mg Cl2/L)。 免费的 在中试规模的分配系统入口处也对氨气剂量进行了控制。六个试点规模中的每一个 配电系统由两个相连的水箱组成,设计成两个水箱 通过反应器的完全混合流。总体而言,试点系统由以下部分组成: 十二辆坦克。每个油箱都有独特的受控条件组合,包括 氯胺残留量、无进水氨浓度和滞留时间。 每个系统末端的氯胺残留量可控制在0.5至1.0 mg Cl2/L 或2.0至2.5 mg Cl2/L。进水过量氨浓度可控制在 高(Cl:NH3=3:1)、中等(Cl2:NH3=4:1)或低水平(Cl2:NH3=5:1)。目标 拘留时间为1天或3天。 每个水箱都连接到一个PVC管回路,带有 直径1.27厘米,长度7.6米。管道回路中的循环流速保持在 使每个储罐成为一个完全混合的反应器,同时可以模拟典型的反应器 实际配电系统中的低流量条件(例如0.07 m/s,Boe Hansen等人,2002年)。 定期在1天的储罐进水、1天的储罐出水(与 流入3天储罐)和3天储罐出水。采样数据包括浓度 水中氯胺、游离氨、溶解氧、亚硝酸盐、硝酸盐、HPC和AOB的含量 散装水。还监测了环境条件、温度和pH值。包括14个参考文献,图。
The objective of this research was to develop a mathematical model that simulates and predicts chemical and biological fundamentals of nitrification in pilot-scale distribution systems and to evaluate kinetic parameters associated with the fundamentals. Six pilot-scale distribution systems were set up at the Water Science and Engineering Laboratory on the campus of the University of Wisconsin-Madison. Water from Lake Mendota was used as the source water to the distribution systems after being treated with conventional alum coagulation and filtration processes. Prior to entering the distribution systems, the treated Lake Mendota water was chloraminated so that the chloramine residual at the end of the system was in a range of typical levels in full-scale distribution systems (i.e., 0.5~2.5 mg Cl2/L). The free ammonia dose was also controlled at the entrance of the pilot-scale distribution system. Each of the six pilot-scale distribution systems was set up with two connected tanks designed to behave as two completely-mixed-flow-through reactors. In total, the pilot system was comprised of twelve tanks. Each tank had a unique combination of controlled conditions including chloramine residual, influent free ammonia concentration, and detention time. Chloramine residuals at the end of each system could be controlled at 0.5 to 1.0 mg Cl2/L or 2.0 to 2.5 mg Cl2/L. Influent excess ammonia concentrations could be controlled at high (Cl:NH3=3:1), medium (Cl2:NH3=4:1), or low levels (Cl2:NH3=5:1). The target detention time was 1 day or 3 days. Each tank was connected to a PVC pipe loop with 1.27 cm diameter and 7.6 m length. Recycle flow rate in the pipe loop was maintained to make each tank a completely mixed reactor and, at the same time, could simulate typical low-flow conditions (e.g. 0.07 m/s, Boe-Hansen et al., 2002) in real distribution systems. Samples were collected regularly at the 1-day tank influent, 1-day tank effluent (same as influent to 3-day tanks), and 3-day tank effluent. Sampling data included concentrations of chloramines, free ammonia, dissolved oxygen, nitrite, nitrate, HPC, and AOB in the bulk water. Ambient conditions temperature and pH were also monitored. Includes 14 references, figure.
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发布单位或类别: 美国-美国给水工程协会
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