Transdisciplinary Initiative for Global Sustainability (TIGS), Integrated Research System for Sustainability Science (IR3S), University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8654, Japan.
Water Sci Technol. 2010;61(4):1073-80. doi: 10.2166/wst.2010.529.
Change of nutrients load and flow according to land-use change induced by housing development was investigated in Bang Yai, Nonthaburi, Thailand, which located in the peri-urban area of Bangkok. Each house in the newly developed residential community was regulated to be equipped with a septic tank to collect night soil. However, greywater and leachate from the septic tank was collected by a community sewage system and discharged into the canals with insufficient treatment, while the canals still function as infrastructure for irrigation and transportation. In the study area, built-up area became 1.4 times and agricultural fields decreased by 13% from 2003 until 2007. Total nutrients load to the canals was increased by 25% as nitrogen and 14% as phosphorus according to the increase of built-up area. Net nutrients load from agricultural fields was largely set off when we evaluated nutrients inflow from the canals to the agricultural field through irrigation. Consequently, nutrients load from domestic wastewater accounted most of net nutrients load into the canal.
研究了泰国曼谷郊区暖武里府邦雅地区由于住房开发引起的土地利用变化对养分负荷和流动的影响。新开发的住宅小区的每栋房屋都被规定配备一个化粪池来收集夜肥。然而，化粪池中的灰水和渗滤液被社区污水系统收集并排入处理不足的运河，而运河仍然作为灌溉和运输的基础设施。在研究区域，从 2003 年到 2007 年，建设用地增加了 1.4 倍，而农业用地减少了 13%。随着建设用地的增加，氮的养分负荷增加了 25%，磷的养分负荷增加了 14%。通过灌溉评估运河中农业用地的养分流入量，来自农田的净养分负荷大大抵消。因此，生活污水中的养分负荷占运河中净养分负荷的大部分。
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