摘要
结合西安市路面径流水质、水量特征及道路雨水口设置,设计道路雨水口截污装置——截污挂篮,试验研究截污挂篮的透水性能、工作状态、截污效果及清洗更换周期。结果表明,为避免在5 a一遇暴雨下道路积水,截污挂篮上部溢流孔孔口面积应至少0.009 8m2。土工布的过滤通量与过滤水头呈线性关系,随单位面积质量增加,土工布的透水能力下降。为确保在5 a一遇暴雨下截污挂篮不发生溢流,由300 g/m2、150 g/m2和130 g/m2土工布制作的截污网袋需至少保证175mm、94mm、75mm的有效过滤高度,且截污挂篮对路面径流颗粒物的平均去除率分别为76.5%、69.4%和56.0%。
The present paper is aimed at providing a detailed analysis and the applicability of the interception device known as the interception basket for preventing the road gullys in Xi＆rsquo;an, Shaanxi, in order to reduce the road runoff pollution and improve the water quality of runoff. The urban water-runoff is the second pollution source which can bring serious impact on the urban water quality and therefore it has been studied since 1970s in the western countries though little attention has been paid to in our country. From the point of view of the environmental protection, it can be said that a lot of various pollutants has been caused by the road runoff, such as the particulate matter, the organic nutrients, heavy metal ingredients and so on, among which the particulate matters should be regarded as the chief carriers for other pollutants. And, it is for this reason, the Environmental Protection Agency of the United States, short for USEPA, has reenforced its management policy and practical measures in controlling the runoff pollution since 1976 with nonpoint source pollution controlled successfully. And, consequently, great reduction of the corresponding resource pollution has been achieved, which has in turn promoted the establishment of effective economic methods. The effective practices of the Americans in this way can serve a succefful example in this connection. In recent years, although studies on road runoff pollution in our country has gained significant development and some researchers have laid down basic work in this way, rare results and available technological devices have been gained on the practical pollution control for the prevention. To overcome this inefficiency and meet the practical controlling demand, we have designed an interception basket device to be applied to road gully in Xi＆rsquo;an city in this paper and made systematic studies on the runoff quality, precipitation characteristics on the road gullies in accordance with Xi＆rsquo;an actual situation. In this paper, we have also discussed the permeability, work status, pollution interception efficiency and replacement cycle of interception basket in the local situation. Results show that the area of overflow loophole of the interception baskets should be at least 0.0098 m2 so as to avoid the road flooding when the storm hitting of every five-year recycling interval turns to repeat. The relation of filtration flux with filtering head of geotextile proves to be linear in nature. That is to say, the more the geotextile mass per unit is, the less the permeability will be. The effective filtering heights of interception basket made by geotextile of 300 g/m2, 150 g/m2 and 130 g/m2 are likely to be at least 175 mm, 94 mm and 75 mm, respectively, on the condition that the overflow will not happen when storm of 5 years recurrence interval occurs. In addition, the SS removing rates of interception baskets made by the geotextile of 300 g/m2, 150 g/m2 and 130 g/m2 would likely be equal to 76.5%, 69.4% and 56.0%, respectively.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2012年第5期69-72,共4页
Journal of Safety and Environment
基金
中央高校基本科研业务费专项资金项目(CHD2012JC016
CHD2012JC032)
关键词
环境工程学
路面径流
雨水口
截污挂篮
土工布
截污网袋
最佳管理措施
environmental engineering
road runoff
gully
inter-ception basket
geotextile
interception bag
best man-agement practice
