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Treatment System for Soil Polluted by VCOCs Utilizing Photocatalysis

利用光催化技术处理 VCOCs 污染土壤的系统

基本信息

批准号：
15310047
负责人：
HASHIMOTO Kazuhito
金额：
$ 10.11万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

Volatile chlorinated organic compounds (VCOCs) such as trichloroethylene (TCE) and tetrachloroethylene (PCE) have been widely used as solvent for dry cleaning of clothes, washing of semiconductors, and so on. They have been disposed out of control, causing the soil and groundwater pollutions. These pollutions are serious environmental problems because these chemicals are carcinogenic and toxic. We have designed and proposed a treatment system for soil polluted by VCOCs utilizing "TiO_2 photocatalyst sheets". The sheet consists of TiO_2 powder and adsorbent (activated carbon). The adsorbent traps VCOCs evaporated from the soil and also traps undesirable intermediates such as phosgene and dichloroacetyl chloride (DCAC) observed by TiO_2-mediated photocatalytic degradation of TCE in gas phase.The system utilizing the photocatalyst sheets and solar light was investigated in the actual polluted field. One field was an old factory site, and the other was an active cleaning shop. The polluted … More soil in the old factory site was mixed with "Hotsoil (CaO)" to volatilize the chemicals (PCE), and the photocatalyst sheets were covered over the soil. As the status has been kept for three weeks, the photocatalyst sheets have illuminated by solar light for the period. PCE concentrations in gas phase of the soil decreased drastically for initial two days, and they were below detectable limit after seven days. The PCE concentrations in the soil were also below 0.01 mg/L whose concentration is Japan's environmental limit of PCE. The other system to treat the polluted soil under the ground in the active cleaning shop was an aspiration treatment of VCOCs gases from the polluted soil through the well by vacuum pomp. The aspirated gases were led to an adsorption device having the photocatalytic sheets. When the sheets saturated by VCOCs gas, we hanged out the sheets under solar light and reused them in the device. The results in the actual fields show that the system using photocatalyst sheets and solar light is effective on the treatment of the soil polluted by VCOCs. Less

三氯乙烯（TCE）、四氯乙烯（PCE）等挥发性氯代有机物（VCOCs）被广泛用作衣物干洗、半导体清洗等溶剂，其处置失控，造成土壤和地下水污染。这些污染是严重的环境问题，因为这些化学物质是致癌和有毒的。本文设计并提出了一种利用“TiO_2光催化片”处理挥发性有机化合物污染土壤的系统。该薄片由TiO_2粉末和吸附剂（活性炭）组成。该吸附剂不仅能捕集挥发性有机化合物，还能捕集光气和二氯乙酰氯（DCAC）等有害中间产物。一个是旧工厂，另一个是一个活跃的清洁店。污染 ...更多信息将旧工厂场地中的土壤与“热土（CaO）”混合以使化学品（PCE）挥发，并将光催化剂片覆盖在土壤上。由于该状态已保持三周，因此光催化剂片在此期间一直被太阳光照亮。土壤气相中PCE浓度在前两天急剧下降，7天后低于检测限。土壤中PCE的浓度也低于0.01 mg/L，达到了日本规定的PCE环境限值。在主动清洁车间中处理地下污染土壤的另一个系统是通过真空泵通过井对污染土壤中的VCOCs气体进行抽吸处理。将吸入的气体引导至具有光催化片的吸附装置。当薄片被VCOCs气体饱和时，我们将薄片挂在太阳光下并在装置中重复使用。现场试验结果表明，光催化片与太阳光联合应用对治理挥发性有机化合物污染土壤是有效的。少