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Iron and Manganese Catalytic Removal for Drinking Water Production 饮用水生产中的铁锰催化去除
发布日期: 2009-11-01
由于传统除铁除锰工艺的众所周知的局限性 (化学剂量、污染物等),饮用水厂的运营商对替代工艺感兴趣 比如催化过程。在此背景下,本项目研究了催化技术,然后 制定了操作指南。本研究中商业材料的批量表征 结果表明,MnO2天然矿石在锰含量方面优于其他材料 移动在同一类型的材料中,保持能力的变化最多为三倍,这 表明在全面实施之前需要测试新材料。中试实验表明,滞留能力与入口浓度不成正比,并且 锰突破出现在达到最大保留容量之前。氯化反冲洗 以及氯气浸泡不允许完全饱和材料的完全再生。高锰酸盐浸泡可使材料完全再生,但很快出现突破。在锰突破之前,每周的氯化反洗会增加BVs,但幅度不大。发现只有与催化介质相关的连续预氧化才能有效确保含锰量超过300µg/L的水资源的最终水质低于10µg/L。通过扫描电子显微镜观察不同饱和阶段的催化介质表面,解释了与催化剂表面再生可行性相关的锰保留效率的差异 媒体。这项技术的主要局限性是pH依赖性,但总体研究表明 使用催化介质去除锰的益处和易用性。包括10个参考文献、表格和图表。
Due to the well-known limitations of the conventional processes for iron and manganese removal (chemical dosage, pollutants, etc.), operators of drinking water plants are interested in alternative processes such as the catalytic process. In this context, this project examined the catalytic technique and then developed operational guidelines. Batch characterization of commercial materials performed in this study indicated that MnO2 natural ores perform better than other materials in terms of manganese removal. Among the same type of material, the retention capacity varies up to a factor of three, which indicates the need to test new material before implementation at full-scale. Pilot scale experiments demonstrated that the retention capacity was not proportional to the inlet concentration and that manganese breakthrough appears before reaching maximum retention capacity. Chlorinated backwashes as well as a chlorine soaking do not allow for a complete regeneration of a fully saturated material. A complete regeneration of the material was obtained with permanganate soaking but breakthrough occured rapidly. A weekly chlorinated backwash increased the BVs before manganese breakthrough but not in a large extent. Only a continuous pre-oxidation associated with the catalytic media was found effective to ensure final water quality below 10 µg/L for water resources containing above 300 µg/L of manganese. Observation of the surface of the catalytic media at different stages of saturation by scanning electron microscopy explains the differences of manganese retention efficiency related to the feasibility of regenerating the surface of the media. The main limitation of this technique is pH-dependence, but the overall study demonstrates the benefit and ease of using catalytic media for manganese removal. Includes 10 references, tables, figures.
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发布单位或类别: 美国-美国给水工程协会
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