[1]王文琦,连军锋,朱易春,等.余氯对化学需氧量测定的影响及改进措施[J].中国给水排水,2025,41(17):138-145.
　WANGWen-qi,LIANJun-feng,ZHUYi-chun,et al.Impact of Residual Chlorine on Measurement of COD and Proposed Improvement Strategies[J].China Water & Wastewater,2025,41(17):138-145.
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余氯对化学需氧量测定的影响及改进措施

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第41卷 期数: 2025年第17期 页码: 138-145 栏目: 出版日期: 2025-09-01
Title:
Impact of Residual Chlorine on Measurement of COD and Proposed Improvement Strategies
作者:
王文琦1,2， 连军锋1,2， 朱易春1,2， 刘祖文1,2， 李凯2， 李文涛3,4， 强志民3,4
（1.江西理工大学 河流源头水生态保护江西省重点实验室，江西 赣州 341000；2.江西理工大学 赣州市流域污染模拟与控制重点实验室，江西 赣州 341000；3.上海交通大学 环境科学与工程学院 绿色造纸与资源循环全国重点实验室，上海 200240；4.中国科学院生态环境研究中心 环境水质学重点实验室，北京 100085）
Author(s):
WANG　Wen-qi1，2， LIAN　Jun-feng1，2， ZHU　Yi-chun1，2， LIU　Zu-wen1，2， LI　Kai2， LI　Wen-tao3，4， QIANG　Zhi-min3，4
（1. Jiangxi Province Key Laboratory of Water Ecological Conservation in Headwater Regions， Jiangxi University of Science and Technology， Ganzhou 341000， China； 2. Ganzhou Key Laboratory of Basin Pollution Simulation and Control， Jiangxi University of Science and Technology， Ganzhou 341000， China； 3. State Key Laboratory of Green Papermaking and Resource Recycling， School of Environmental Science and Engineering， Shanghai Jiao Tong University， Shanghai 200240， China； 4. Key Laboratory of Environmental Aquatic Chemistry， Research Center for Eco?Environmental Sciences， Chinese Academy of Sciences， Beijing 100085， China）
关键词:
余氯;  化学需氧量（COD）;  掩蔽作用;  改进措施;  总有机碳（TOC）
Keywords:
residual chlorine;  chemical oxygen demand (COD);  masking effect;  improvement strategy;  total organic carbon (TOC)
摘要:
基于活性氯的水处理工艺在废水有机物去除中具有良好的应用前景，但水中余氯对化学需氧量（COD）测定的影响机理和改进措施还尚未明确。针对这一问题，考察了模拟水样和实际水样中不同浓度的余氯对COD测定数据的影响。结果表明，0~120 mg/L的余氯会导致快速密闭消解法和哈希消解分光光度法测得的COD较低，但总有机碳（TOC）浓度未变化，表明余氯并没有真正矿化水中有机物。对于快速密闭消解法，余氯替代Cr2O72-与有机物发生氧化反应可导致COD测定值减小；对于哈希消解分光光度法，余氯在350 nm波长处的吸光度会降低低量程COD测定方法所得结果。高温消解过程可以排除水中有机物本身对吸光度的干扰，但可能促使余氯与有机物反应生成新的吸光物质导致COD测定值偏低。水样pH对不同COD测定方法中余氯干扰的影响较小，而通过硫酸亚铁铵还原水样中的余氯可使COD的测定准确度达到71.0%~92.8%。
Abstract:
The water treatment process utilizing active chlorine demonstrates significant potential for the removal of organic matters from wastewater. However, the impact of residual chlorine on chemical oxygen demand (COD) measurements, as well as corresponding improvement strategies, remains insufficiently understood. To address this issue, this study investigated the effect of varying residual chlorine in both simulated and actual water samples on COD measurement accuracy. Residual chlorine ranging from 0 to 120 mg/L resulted in a reduction in the measured COD when analyzed using the rapid closed digestion method or the Hach digestion spectrophotometric method. However, the total organic carbon (TOC) in the water remained constant, suggesting that residual chlorine does not effectively mineralize organic matters in aqueous environments. In the rapid closed digestion method, residual chlorine substituted Cr2O72- and participated in oxidation reactions with organic matters, which resulted in a lower COD measurement. In the case of the Hach digestion spectrophotometric method, the absorbance of residual chlorine at a wavelength of 350 nm interfered with the measurement, thereby reducing the value obtained using the low-range COD measurement method. The high-temperature digestion process effectively eliminated the interference of intrinsic organic matters in water on absorbance measurements. However, it might also promote the reaction between residual chlorine and organic matters, leading to the formation of new absorbent substances, which resulted in a lower measured COD value. The pH of water samples had minimal impact on the interference caused by residual chlorine across different COD determination methods. Nevertheless, the removal of residual chlorine using ammonium ferrous sulfate significantly enhanced the accuracy of COD measurements, improving it to between 71.0% and 92.8%.

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更新日期/Last Update: 2025-09-01