Evaluation of Water Flow and Oxygen Uptake of Sponge Support Media in DHS Reactor Developed for Sewage Treatment in Developing Countries
Evaluation of Water Flow and Oxygen Uptake of Sponge Support Media in DHS Reactor Developed for Sewage Treatment in Developing Countries
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发展中国家污水处理 DHS 反应器中海绵支撑介质的水流量和耗氧量评估
DOI：
10.11395/jjsem.15.30
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
前野一夫
中科院分区：
文献类型：
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作者：
大久保努;高橋優信;久保田健吾;原田秀樹;時田政輝;上村繁樹;前野一夫
下流式悬挂海绵反应器主要用于发展中国家的污水处理。该新型载体采用聚氨酯海绵材料作为支撑介质，保证了大量生物质的增殖，因此具有优异的去除污染物的能力。对三种海绵支撑介质的水流和吸氧能力进行了表征。向由40个海绵介质串联而成的装置供水，然后进行示踪实验。根据支撑介质类型的不同，实际水力停留时间（HRT）与理论水力停留时间（HRT）之比在25-67%之间，这意味着该类型反应器中存在短路流。通过从装置顶部供应脱氧水，评估总体体积氧传递系数KLa。在无曝气条件下，KLa值也很高，达到0.56 ~ 4.88 (1/min)，超过了其他机械曝气好氧过程。此外，研究发现，进水中的悬浮固体（SS）浓度对提高实际HRT/理论HRT的比率起作用，这意味着管理进水SS浓度是防止DHS堵塞问题的先决条件。
Down-flow hanging sponge (DHS) reactor has been developed mainly for sewage treatment in developing countries. The novel rector employs polyurethane sponge material as support media, which promises a proliferation of a large amount of biomass, and thus an excellent capability of removing pollutants. The characterization of the three types of sponge support media is conducted in respect of water flow and oxygen uptake ability. Water was supplied to the device which consisted of 40 sponge media connected in series, and then tracer experiment was carried out. The ratios of actual hydraulic retention time (HRT) per theoretical HRT were in the range of 25-67% depending on the type of support media, meaning that short circuit flow occurs in this type of reactor. By supplying deoxygenized water from the top of the device, overall volumetric oxygen transfer coefficient, KLa, was evaluated. In spite of the non-aerated conditions, the KLa values were so high, 0.56-4.88 (1/min), surpassing those of other mechanically aerated aerobic processes. Furthermore, it was found that the suspended solids (SS) concentration in the influent played a role to increase the ratio of actual HRT/theoretical HRT, meaning that management of the influent SS concentration is prerequisite for preventing the clogging problem in the DHS.