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Deodorization of livestock odors utilizing photoinduced hydrophilicity and decompodition on TiO_2

利用TiO_2光诱导亲水性和分解作用去除牲畜臭味

基本信息

批准号：
17510081
负责人：
SUNADA Kayano
金额：
$ 2.18万
依托单位：
The University of Tokyo (2006-2007)Kanagawa Academy of Science and Technology (2005)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

Recently, there has been the livestock field near home zone from a suburban agriculture, which causes a lot of complaints for livestock odors from the neighborhood. Thus, the technology of deodorant for livestock odor is required. We have designed a deodorant system for the odors from the windowless pig house or the closed compost facility utilizing photoinduced hydrophilicity and decomposition on TiO_2 surfaces. The system involves two steps, one step is the treatment by microbial cells cultivated naturally on the biofilter and continuous step is photocatalytic treatment.First, we have selected "photocatalytic filter" as a photocatalytic material which can enough adsorb and decomposed ammonia gas and can easily wash out nitrate generated from ammonia oxidation. Next, the systems having two layers of biofilters (SKOV Co. Denmark) and one layer of photocatalytic filter were constructed in an actual windowless pig house and a closed compost facility, and were evaluated for the deodorant effect. For example, the concentration of ammonia gas in the closed compost facility was 70-120 vppm, and it changed less 10 vppm after passing through biofilters of two layers, and finally it decreased by less 2 vppm after passing through photocatalytic filter of one layer. The bad odors even with low concentration such as sulfur compounds (H_2S, SO_2) and organic acids (propionic acid, n-, iso-valeric acid) can be also removed by passing through both filters. Furthermore, a photocatalytic filter with high durability was prepared by coating stainless steel with TiO_2 film, and evaluated far the removing effect of ammonia gas. The prepared photocatalytic filter had almost same photocatalytic activity as the current filter.

最近，城郊某农业小区附近出现了家畜饲养场，引起了附近居民对家畜气味的投诉。因此，对家畜气味除臭技术提出了要求。我们利用TiO_2表面的光致亲水性和分解特性，设计了一种除臭系统，用于去除无窗猪舍或封闭堆肥设施的异味。该系统包括两个步骤，第一步是在生物过滤器上自然培养的微生物细胞处理，连续步骤是光催化处理。首先，我们选择了“光催化过滤器”作为光催化材料，它可以充分吸附和分解氨气，并且可以很容易地冲洗出氨氧化产生的硝酸盐。接下来，两层生物过滤器（SKOV Co. Denmark）和一层光催化过滤器的系统在一个实际的无窗猪舍和一个封闭的堆肥设施中建造，并对除臭效果进行了评估。例如，密闭堆肥设施内氨气浓度为70-120 vppm，经过两层生物滤池后氨气浓度变化小于10 vppm，最后经过一层光催化滤池后氨气浓度下降小于2 vppm。即使是低浓度的硫化物（H_2S、SO_2）和有机酸（丙酸、n-、异戊酸）也可以通过这两种过滤器去除。在不锈钢表面涂覆TiO_2膜，制备了高耐久性的光催化过滤器，并对其对氨气的去除效果进行了评价。所制备的光催化过滤器具有与现有过滤器基本相同的光催化活性。