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Feasibility Study Of Granular Activated Carbon For Dissolved Organic Nitrogen Removal From Wastewater Treatment Plant Effluent

机译：颗粒活性炭去除废水处理厂废水中溶解性有机氮的可行性研究

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摘要

Some wastewater treatment plants must meet very low concentrations of total nitrogen in their discharged water with the maximum daily load at Truckee Meadows Water Reclamation Facility (TMWRF) being 500 lbs/day for total nitrogen. For this project, data previously collected from influent and final effluent were analyzed to establish trends of dissolved organic nitrogen (DON) concentration and total organic nitrogen (TON) concentrations throughout the year. These measurements indicate significant portions of DON contributing to the TON in both influent and effluent samples; with the influent DON composing 44% of the influent TON, and the effluent DON composing 91.5% of the effluent TON. Treatment processes aimed at removing dissolved organic nitrogen may serve to reduce TON in the effluent and provide a factor of safety so treatment plants do not exceed daily limits of total nitrogen loads. Determining DON behavior throughout the treatment processes of TMWRF was accomplished by collecting samples from the influent, primary effluent, secondary effluent, denitrification effluent, and final effluent. DON concentrations varied greatly throughout the first three processes while denitrification and final effluent were the most stable and consistent having averages of 1.25+/-0.18 mg N/L and 1.21+/-0.19 mg N/L, respectively. Granular activated carbon (GAC) was used as a treatment process for the removal of DON from the final effluent. Analysis for overall effectiveness of this approach includes testing seven GAC products from various suppliers and examining them using isotherm experimentation to determine amounts of DON removed from the final effluent. Based on the isotherm data, three products were selected for column testing. A final GAC product was then selected and used to optimize the column operational parameters. A 12-minute empty bed contact time (EBCT) with an aspect ratio of 30:1 exhibited the best performance and removed 29% of DON in the column life. The GAC adsorbed 6.17 mg-N for every gram of GAC when operated to 6,000 bed volumes. Microbial activity occurred in both column tests and may have metabolized some DON. Regeneration of GAC was performed thermally at 850 oC and chemically with formic acid. The regenerated GAC performance was analyzed using the Freundlich isotherm curve. An economic evaluation on a full-scale column operating was done using the column test results and design parameters. The economic evaluation was done for a column to treat 1 million gallons per day of final effluent from TMWRF and would have an estimated annual cost of $600,000 per year without regeneration. Adsorption of DON onto GAC has revealed to be effective and have potential for wastewater treatment at TMWRF.
机译：一些废水处理厂必须满足其排放水中极低的总氮浓度，而Truckee Meadows水回收厂（TMWRF）的最大日负荷为总氮500磅/天。对于该项目，分析了以前从进水和最终废水中收集的数据，以确定全年的溶解有机氮（DON）浓度和总有机氮（TON）浓度的趋势。这些测量结果表明，在进水和出水样品中，DON的显着部分都对TON有贡献。进水DON占进水TON的44％，出水DON占进水TON的91.5％。旨在去除溶解的有机氮的处理工艺可能会降低废水中的TON，并提供安全系数，因此处理厂不会超过总氮负荷的每日限制。通过从进水，一级废水，二级废水，反硝化废水和最终废水中收集样品来确定整个TMWRF处理过程中的DON行为。 DON的浓度在前三个过程中变化很大，而反硝化作用和最终出水最为稳定和一致，其平均值分别为1.25 +/- 0.18 mg N / L和1.21 +/- 0.19 mg N / L。颗粒活性炭（GAC）被用作从最终废水中去除DON的处理方法。对这种方法的整体有效性进行的分析包括测试来自各种供应商的七种GAC产品，并使用等温线实验对其进行检查，以确定从最终流出物中去除的DON量。根据等温线数据，选择了三种产品进行色谱柱测试。然后选择最终的GAC产品，并用于优化色谱柱操作参数。长宽比为30：1的12分钟空床接触时间（EBCT）表现出最佳性能，并去除了色谱柱寿命中DON的29％。当操作到6,000床体积时，GAC吸附每克GAC吸附6.17 mg-N。两种柱测试均发生了微生物活性，并且可能已经代谢了一些DON。 GAC的再生是在850 oC的温度下进行热反应，然后用甲酸进行化学反应。使用弗氏等温线分析再生的GAC性能。使用色谱柱测试结果和设计参数对全尺寸色谱柱操作进行了经济评估。对一个色谱柱进行了经济评估，该色谱柱每天处理来自TMWRF的最终出水100万加仑，如果不进行再生，估计每年的年度成本为60万美元。 DON在GAC上的吸附已被证明是有效的，并具有在TMWRF进行废水处理的潜力。

著录项

  • 作者

    Mayorga, Alexander R.;

  • 作者单位

    University of Nevada, Reno.;

  • 授予单位 University of Nevada, Reno.;
  • 学科 Environmental engineering.;Engineering.
  • 学位 M.S.
  • 年度 2016
  • 页码 91 p.
  • 总页数 91
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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