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Evaluation of hydrogen sulfide concentration and control in a sewer system.

机译:下水道系统中硫化氢浓度的评估和控制。

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摘要

This study focuses on monitoring hydrogen sulfide (dissolved and atmospheric) generation and wastewater volumetric flow in a 13.4 mile sewer line of the City of San Antonio, Texas. Results are used to evaluate daily and seasonal trends of atmospheric and dissolved sulfide, and to better apply sulfide control practices to prevent odor and corrosion. The work was performed in conjunction with The San Antonio Water System (SAWS). SAWS is currently dosing ferrous sulfate (FeSO4) to control odor and corrosion in their sewers. As part of this study, the evaluation of a cost-effective dosing strategy with FeSO4 was performed to better control the sulfide contents in wastewater.;Sulfide concentrations, flow and physical properties of the wastewater were monitored at two points (upstream site and downstream site) along the sewer line to provide enough data to analyze variations and identify diurnal trends and possible seasonal differences. In addition, dosing studies were performed in the laboratory to find out the required ratio of ferrous sulfate for acceptable sulfide removal. These laboratory measurements were compared with chemical equilibrium model simulations.;Flow was higher at the upstream site than the downstream site due to flow splitting 8.7 miles downstream. Sulfide concentrations were found higher at the downstream site, especially in the summer months. Laboratory dosing studies indicate a 1.25 mole ratio requirement, to reduce sulfide by 93%. The dosing results were compared with the chemical equilibrium software finding a similar trend in sulfide precipitation at pH of 7.06. However, sulfide removal gets more difficult as pH decreases due to solubility constraints.;Sulfide requirements were calculated based on total flow downstream and the respective sulfide concentrations, excluding the values below 2 mg/L where corrosion has been reported to be minimal. Over a typical daily diurnal cycle, necessary dosing rates to maintain sulfide concentrations below 2 mg/L varied between 0 and 9,077 gpd with a daily average rate of 3,565 gpd. If instead of dosing at the maximum required rate, dosing were matched over the diurnal cycle, chemical savings would amount to 5,512 gpd while achieving sulfide control. The approximate cost of the ferrous sulfate solution dosed by SAWS is
机译:这项研究的重点是监视得克萨斯州圣安东尼奥市13.4英里下水道管线中硫化氢(溶解的和大气中的)产生和废水的体积流量。结果可用于评估大气和溶解硫化物的每日和季节性趋势,并更好地应用硫化物控制措施以防止气味和腐蚀。这项工作是与圣安东尼奥供水系统(SAWS)一起进行的。 SAWS目前正在对硫酸亚铁(FeSO4)进行计量,以控制下水道中的气味和腐蚀。作为这项研究的一部分,对FeSO4的经济有效剂量策略进行了评估,以更好地控制废水中的硫化物含量。;在两个位置(上游站点和下游站点)监测废水的硫化物浓度,流量和物理性质)沿着下水道线提供足够的数据来分析变化并确定日趋势和可能的季节差异。另外,在实验室中进行了剂量研究,以找出可去除硫化物所需的硫酸亚铁比例。将这些实验室测量结果与化学平衡模型模拟进行了比较。由于下游分流8.7英里,上游站点的流量高于下游站点。在下游站点发现硫化物浓度更高,尤其是在夏季。实验室定量研究表明,要使硫化物减少93%,摩尔比要求为1.25。将配量结果与化学平衡软件进行了比较,发现在pH 7.06时硫化物沉淀具有相似的趋势。但是,由于溶解度的限制,随着pH值的降低,硫化物的去除变得更加困难。硫化物的要求是根据下游的总流量和各自的硫化物浓度(不包括低于2 mg / L的腐蚀最小的值)计算得出的。在典型的每日昼夜周期中,维持硫化物浓度低于2 mg / L所需的剂量率在0到9,077 gpd之间变化,日平均速率为3,565 gpd。如果不是按照最大所需剂量进行配药,而是在昼夜循环中进行配药,则在实现硫化物控制的同时,化学药品节省量将达到5,512 gpd。 SAWS计量的硫酸亚铁溶液的近似成本为

著录项

  • 作者

    Recio Oviedo, Eugenio.;

  • 作者单位

    The University of Texas at San Antonio.;

  • 授予单位 The University of Texas at San Antonio.;
  • 学科 Engineering Civil.;Engineering Environmental.
  • 学位 M.S.
  • 年度 2010
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:36:45

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