潮汐对沿海城市下水道硫化氢污染的影响

发布时间：2018-03-29 20:27

  本文选题：下水道　切入点：硫化氢　出处：《华南师范大学学报(自然科学版)》2017年02期

【摘要】：沿海城市下水道易受潮汐影响,使得部分海水周期性地进出城市排水管网,从而改变下水道中的硫化氢产生与转化过程.为此,通过实验和数学模型评估香港排水管网某感潮管段受潮汐作用影响.实验结果表明:潮汐作用显著提高了下水道污水的硫化物峰值,导致硫化氢污染情况明显恶化;硫化物质量浓度与潮位呈反比,出现周期性变化;海水入侵带来的溶解氧和稀释作用一定程度上缓和了这一影响,体现为大潮时的硫化物峰值质量浓度相对提升较少;建立的下水道感潮管段水质数学模型可以较好地模拟、再现这一过程.由此可见,潮汐作用使下水道的硫化氢污染问题恶化并使硫化物质量浓度随潮汐涨退呈周期性变化,通过数学模型优化控硫药剂投加方案可以实现更有效、更经济的感潮管段硫化氢污染控制.
[Abstract]:Sewers in coastal cities are vulnerable to tidal effects, which make part of sea water periodically enter and exit urban drainage networks, thus changing the process of generation and transformation of hydrogen sulfide in sewers. An experimental and mathematical model is used to evaluate the tidal effect on a tidal section of Hong Kong drainage network. The experimental results show that the tidal action can significantly increase the peak value of sulphide in sewer sewage and lead to the deterioration of hydrogen sulfide pollution. The concentration of sulfides is inversely proportional to the tidal level, and periodic changes occur, and the dissolved oxygen and dilution brought about by seawater intrusion soften this effect to some extent, which is reflected in the relatively small increase in the peak mass concentration of sulphide during the spring tide. The established mathematical model of water quality in tidal pipe section of sewers can well simulate and reproduce this process. Thus, the problem of hydrogen sulfide pollution in sewers is aggravated by tidal action and the concentration of sulfides varies periodically with the tide rising and retreating. A more effective and economical control of hydrogen sulfide pollution in tidal pipe can be realized by optimizing the adding scheme of sulfur control agent by mathematical model.
【作者单位】： 华南师范大学化学与环境学院;广州市番禺污水治理有限公司;
【基金】：国家自然科学基金项目(51178192) 广东省高等学校优秀青年教师培养计划项目(YQ2015047) 广州市珠江科技新星项目(2014J2200048)
【分类号】：P731.23;TU992;X703
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本文编号：1682715