• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Treatment of Reverse Osmosis Brine with Advanced Oxidative Processes for Enhanced Phosphorus Removal.
【24h】

Treatment of Reverse Osmosis Brine with Advanced Oxidative Processes for Enhanced Phosphorus Removal.

机译：用高级氧化工艺处理反渗透盐水，以增强除磷效果。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Current regulations for sensitive receiving waters are approaching the limit of technology for phosphorus removal and improved methods are required. Existing methods target removal of the orthophosphate form of phosphorus, but to achieve low effluent limits other non-reactive (NRP) forms, such as condensed phosphate and organic phosphorus, must be removed as well. This could be accomplished by developing a quaternary step in wastewater treatment that utilizes reverse osmosis (RO) followed by advanced oxidation processes (AOP) on the produced brine (RO concentrate). The objective during advanced treatment is to convert NRP in the brine to reactive phosphorus for removal by traditional chemical addition methods; however, the various antiscalants utilized for RO membrane maintenance can contribute phosphorus to the brine. To test brine treatment as a viable alternative to achieve low effluent phosphorus, antiscalant-free brine, demonstration facility-produced brine, four commercially available antiscalants and various representative model phosphorus compounds were evaluated for treatment effectiveness. For antiscalant addition experiments the dosage of antiscalant was designed to match the necessary concentration for effective RO membrane maintenance. The advanced oxidation processes evaluated were 100 ppb peroxide for 30 minutes, 50 ppm bleach for 30 minutes, pH 2 for 30 minutes, and 100 ppb peroxide at pH 2 for 30 minutes. The use of chemical addition as a pretreatment was also evaluated. Treatment effectiveness was determined by measuring residual total phosphorus post AOP treatment after a subsequent 6 ppm alum treatment. The use of 30 ppm alum chemical addition as a pretreatment effectively improves the use of AOPs for P removal from 57% up to 73% for a 100 ppb peroxide at pH 2 treated antiscalant free brine. The most effective chemical AOP after a 30 ppm alum pretreatment was 100 ppb peroxide at pH 2 which achieved 73% TP removal for the antiscalant-free brine, 84% TP removal in the demonstration facility produced brine, 66-82% TP removal for the brine amended with the three commercially available antiscalants, and 3-92% TP removal for the various phosphorus standards. A comparison removal using a multiphase treatment which employs UV digestion with 3000 ppm peroxide at pH 2 and 80-90°C for 1 hour was also evaluated and achieved 81-94% TP removal in the two brines and four antiscalant-dosed brines, as well as 73-84% TP removal in the various phosphorus standards. The effectiveness of treatments at converting NRP seems to be bond type dependent, such that phosphate-esters, followed by phospho-esters are the most convertible, whereas phosphonate bonds seem to be resilient to conversion. Therefore RO shows potential for quaternary treatment to achieve low phosphorus levels. The RO brine can concentrate nutrients (whether naturally occurring or contributed by antiscalants), which can be removed by chemical addition as well as via AOP processes.;Keywords: Brine, Reverse Osmosis, Advanced Oxidative Processes, Non-reactive phosphorus, Antiscalants.
机译：当前敏感接收水的法规已接近除磷技术的极限，需要改进方法。现有方法的目标是去除正磷酸盐形式的磷，但是要实现低排放限值，还必须去除其他非反应性（NRP）形式，例如缩合磷酸盐和有机磷。这可以通过在废水处理中开发一个四级步骤来实现，该步骤利用反渗透（RO），然后对产生的盐水（RO精矿）进行高级氧化工艺（AOP）。深度处理过程中的目标是将盐水中的NRP转化为活性磷，以通过传统的化学添加方法去除。但是，用于反渗透膜维护的各种防垢剂可以使盐水中含有磷。为了测试盐水处理作为获得低排放磷的可行替代方法的效果，不含防垢剂的盐水，示范设施生产的盐水，四种市售的防垢剂和各种代表性的模型磷化合物的处理效果进行了评估。对于防垢剂添加实验，将防垢剂的剂量设计为与有效的RO膜维护所需的浓度匹配。评估的高级氧化工艺为：100 ppb过氧化物30分钟，50 ppm漂白剂30分钟，pH 2 30分钟和100 ppb过氧化物2 pH 30分钟。还评估了化学添加作为预处理的用途。通过在随后的6 ppm明矾处理后测量AOP处理后的残留总磷来确定处理效果。在pH 2处理的无垢除盐水中，使用30 ppm的明矾化学添加物进行预处理可有效地改善AOP的除磷效果，从100％ppb过氧化物的57％增至73％。经过30 ppm的明矾预处理后，最有效的化学AOP是pH值为2的100 ppb过氧化物，对于不含防垢剂的盐水，TP的去除率为73％，在示范工厂生产的盐水中，TP的去除率为84％，对于盐水而言，TP的去除率为66-82％。盐水用三种市售的阻垢剂进行了修正，并针对各种磷标准品去除了3-92％的总磷。还评估了使用多相处理的比较去除效果，该处理采用3000 ppm过氧化物在pH 2和80-90°C下用3000 ppm过氧化物进行UV消解1小时，在两种盐水和四种防垢剂加盐水中实现了81-94％的TP去除，因为各种磷标准品中的TP去除率达到73-84％。转化NRP的治疗效果似乎取决于键的类型，因此磷酸酯，其次是磷酸酯的转化率最高，而膦酸酯键似乎对转化具有弹性。因此，RO具有进行四价处理以实现低磷含量的潜力。反渗透盐水可以浓缩营养物质（无论是天然存在的还是由阻垢剂提供的），这些营养素可以通过化学添加以及AOP工艺去除。关键词：盐水，反渗透，高级氧化过程，非反应性磷，阻垢剂。

著录项

  • 作者

    Patton, Petrease H.;

  • 作者单位

    Wilfrid Laurier University (Canada).;

  • 授予单位 Wilfrid Laurier University (Canada).;
  • 学科 Chemistry Analytical.
  • 学位 M.Sc.
  • 年度 2013
  • 页码 166 p.
  • 总页数 166
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号