Research On Rainwater Collection And Treatment Of Courtyard Residential Roofts In Yantai Area

Water problem has become the most prominent problem in China's economic development in the 21 st century,and the water supply situation is tense.Rainwater,as the most direct,fundamental and economical water resource,plays a very important role in water conservation,soil and water conservation and ecological environment protection.Roof rainwater collection is convenient and water quality is good,so it is the focus of urban rainwater collection.The existing rainwater collection and treatment technology has become more and more mature,but most of them are suitable for large-scale and centralized treatment systems in residential areas.This paper studies the roof rainwater of dispersed monomer buildings such as courtyard houses and villas,and designs a set of miniaturized and integrated rainwater collection and treatment equipment.Firstly,according to the research status at home and abroad,the paper summarizes the basic ways and principles of roof rainwater collection and treatment of courtyard dwelling house,selects a typical courtyard dwelling house in Yantai area,collects representative samples of natural rainfall and roof rainwater,and analyses the influence of air pollution,seasonal factors,rainfall intensity and sunny accumulation factors on roof rainwater runoff pollution.The runoff pollution characteristic curve studies the runoff and rainwater pollution outflow law of roof runoff,determines the roof rainwater collection and treatment technology for courtyard residential buildings,and designs a set of automatic self-cleaning roof rainwater collection and treatment device.On this basis,the technological parameters of each component of roof rainwater collection and treatment equipment are designed.The device is installed in a project of a courtyard house in Ziyuntai Villa District of Yantai High-tech Zone,and the field operation effect of the device is tested.The results show that the device has good field operation effect and various pollution indicators have been well controlled.Among them,SS,turbidity and other physical pollution indicators have strong control effect.The separation and filtration rates are 84.91% and 78.57% respectively.The chemical pollution indexes such as COD,ammonia nitrogen in water are relatively poor,but they can still keep the indexes within the normal range.Technical and economic analysis shows that the cost recovery period of the project is 7.84 years,which can bring goodeconomic,social and environmental benefits.