Development of Advanced Treatment Systems of Rural Sewerage by the Combination of Biogeofilter and Biotope Pond

生物地滤池与生境池相结合的农村污水深度处理系统开发

• 批准号: 16510064
• 负责人: OZAKI Yasuo
• 金额: $ 2.56万
• 依托单位: Akita Prefectural University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16510064/
• 关键词: rural sewerage drain; advanced treatment; useful plant; filter material; water purification; nitrogen, phosphorus; environmental education; biotope; ビオトープ; 資源循環

As a result of the selection of plants suitable for the advanced treatment of rural sewerage located in Akita City, we clarified that summer plants including forage rice plant, sesbania, Italian rye grass, and fall-winter plants including potherb mustard and nozawana have high nitrogen and phosphorus absorbing ability. And we conducted experiments of advanced treatment of rural sewerage with Biogeofilter (BGF) that was built in a rural sewerage plant. In a BGF filled with zeolite, we demonstrated that in 2004 the growth of forage rice plant was very bad because zeolite absorbed most of nutrition, but that in 2005 its growth and the removal rate of phosphorus were improved. Moreover it was suggested that NH_4-N was almost completely removed by the filled zeolite for two years when the secondary treated water of the average NH_4-N concentration 33mg/L was provided to a BGF at the time interval of one day and a half.We also constructed three series of BGF for the environmental education for elementary school children. We planted flowers, vegetables and resource plants such as sesbania and papyrus in these BGF. In biotope ponds we brought killifish and loaches from the surrounding paddy fields, and observed their growth. We observed that the bio-diversity in the ponds was maintained. After the plantation of plants, the observation of the growth and the final presentation by school children, we clarified that the environmental consciousness of the children was stimulated and that teachers gave a high evaluation to this experiment. These researches suggest that it is important, for effective advanced treatment of rural sewerage, to make up appropriate combination models of filter materials and plants considering their nutrition absorbing abilities so that we could reach the target of treated water quality.

通过对秋田市农村污水深度处理适宜植物的筛选结果，我们明确了饲料稻、田菁、意大利黑麦草等夏季植物和雪里蕻、野泽菜等秋季植物具有较高的氮磷吸收能力。我们在农村污水处理厂内进行了生物地滤器（BGF）深度处理农村污水的实验。在填充沸石的BGF中，我们证明了2004年饲用水稻生长情况很差，因为沸石吸收了大部分营养，但2005年其生长和除磷率有所提高。另外，当平均NH_4-N浓度为33mg/L的二级处理水以一天半的时间间隔提供给BGF时，两年内NH_4-N几乎被填充沸石完全去除。我们还构建了三个系列的BGF用于小学生的环境教育。我们在这些BGF中种植了花卉、蔬菜以及田菁、纸莎草等资源植物。在群落生境池塘中，我们从周围的稻田中引入了鳉鱼和泥鳅，并观察了它们的生长。我们观察到池塘中的生物多样性得以维持。经过植物的种植、生长情况的观察以及小学生的最终展示，我们了解到孩子们的环保意识得到了激发，老师们对本次实验给予了高度评价。这些研究表明，为了有效地对农村污水进行深度处理，考虑滤料和植物的营养吸收能力，制定合适的滤料和植物组合模型，以达到处理后的水质目标。