| 利用主要缺氧段ORP作为连续流单污泥污水脱氮除磷系统调控参数 |
| 摘要点击 3538 全文点击 1435 投稿时间：2014-11-08 修订日期：2015-03-06 |
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| 中文关键词 ORP 连续流 调控参数 脱氮 除磷 |
| 英文关键词 ORPm continuous flow control parameter denitrification phosphorus removal |
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| 中文摘要 |
| 为了优化污水脱氮除磷系统的运行,基于试验结果和物料平衡分析,以系统脱氮除磷性能和缺氧吸磷性能为评价依据,考察主缺氧段氧化还原电位(ORPm)作为连续流单污泥脱氮除磷系统运行调控参数的可行性,并揭示其与氮、磷物质转化规律的关系,确定最佳ORPm设定值. 试验期间,以硝化液内循环流量为被控变量,采用PLC自动控制系统调控ORPm,其它运行参数保持不变. 试验分为6个阶段,各阶段控制系统ORPm设定值分别为-143、-123、-105、-95、-72 以及-57 mV. 结果表明,不同ORPm设定值条件下,出水氨氮浓度变化较小,但TN、TP浓度变化较明显,当ORPm设定值为-95 mV时,连续流单污泥脱氮除磷系统具有最佳的氮磷去除性能. 物料平衡分析结果表明,当ORPm设定值由-143 mV增加至-57 mV时:1主缺氧段硝酸盐氮反应量分别为214.40、235.16、241.16、244.02、240.90以及233.65 mg ·h-1; 该段内TN转化量分别为244.92、255.85、328.04、347.45、336.42以及320.60 mg ·h-1,硝酸盐氮和TN反应量均在ORPm设定值为-95 mV时达到峰值. 2厌氧段释磷量分别为-214.12、-228.64、-259.26、-264.54、-256.92和-252.84 mg ·h-1,系统总吸磷量分别为252.15、275.85、332.25、338.10、336.15和324.30 mg ·h-1,其中主缺氧段吸磷量分别为30.27、62.14、124.58、154.41、150.41和138.30 mg ·h-1,吸磷量在ORPm设定值为-95 mV时达到峰值. 结果表明,ORPm值可作为连续流单污泥脱氮除磷系统运行调控参数. |
| 英文摘要 |
| To optimize the performance of nitrogen and phosphorus removal, based on test results and mass balance, the feasibility of control for nitrogen and phosphorus removal in the single sludge system with a continuous flow using ORP in the main anoxic stage (ORPm) was investigated, meanwhile, the objective laws of conversion for nitrogen and phosphorus under different ORPm were expounded. During the experiments, nitration liquid internal circulation flow rate was controlled as the variable. The OPRm was controlled by PLC automatically, and the other operation parameters remained unchanged. The experiments tested six different ORPs in main anoxic stage affecting nitrogen and phosphorus removal, i.e., -143, -123, -105, -95, -72, and -57 mV. The ammonia concentration changed a little in effluent under the condition of different ORPms, however, the TN and TP concentrations changed obviously. When the ORPm was controlled as -95 mV, the active sludge reached the maximal nitrogen and phosphorus removal with the continuous flow. According to mass balance calculation, when ORPm increased from -143 mV to -57 mV, ①In the main anoxic stage, nitrate nitrogen reaction rates were 214.40, 235.16, 241.16, 244.02, 240.90 and 233.65 mg ·h-1, respectively; the amount of total nitrogen conversions were 244.92, 255.85, 328.04, 347.45, 336.42 and 320.60 mg ·h-1, respectively; both reaction rates reached the peak at the ORPm of -95 mV; ②Phosphorus release rates in anaerobic stage were -214.12, -228.64, -259.26, -264.54, -256.92 and -252.84 mg ·h-1, respectively; total phosphorus absorption rates were 252.15, 275.85, 332.25, 338.10, 336.15 and 324.30 mg ·h-1, respectively, and phosphorus absorption rates were 30.27, 62.14, 124.58, 154.41, 150.41 and 138.30 mg ·h-1, respectively, in the main anoxic stage; phosphorus absorption rates reached the peak when ORPm was -95 mV. The experiments revealed that ORPm could be used as the control parameter of nitrogen and phosphorus removal in single sludge system with a continuous flow. |
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