天津城区雨水利用的前景分析

Prospect Analysis of Urban Rainwater Harvesting in Tianjin

水资源紧缺已成为全球性问题。城市雨水作为一种宝贵的资源,已经成为一些国家和地区的重要水源。通过对天津市降水特征的监测分析,得出天津市降雨量较为充足且集中在6、7、8三个月份,初期径流雨水污染较为严重(路面SS和COD浓度分别为235 mg/L和131 mg/L,屋面SS和COD浓度分别为72 mg/L和53 mg/L),但经弃流初期雨水后的雨水水质较好(路面SS和COD浓度分别为93 mg/L和57 mg/L,屋面SS和COD浓度分别为30 mg/L和21 mg/L),适合作为回用水水源。讨论了在天津市中心城区内具有代表性区域的雨水利用方案,老城区内宜采用小规模雨水利用装置;新建小区宜将雨水集蓄利用、渗透与园艺水景观等相结合;文化保护区内宜将雨水有组织的快速排除,在该区域外实施雨水利用工程;公园、广场可作为大型雨水储蓄池,在少雨季节时,作为回用水水源。

Water shortage is becoming a worldwide problem. As a valuable resource, urban rainwater has become a sort of major source in some countries and regions. By monitoring and making analysis of rainfall in Tianjin, it was found that there is abundant water concentrated falling in 3 months which is June, July and August. After abandoning the original rainwater that has been polluted seriously, stormwater is good for rainwater harvesting. Rainwater harvesting programs of some typical regions in central urban Tianjin were discussed, it was proposed that the old residential area could implement small scale rainwater harvesting, new residential area could combine rainwater harvesting with filtration and waterscape, rainwater should be removed out in the culture area while parks and squares could be used as storage tanks.