Rainwater in road public areas, green belts and roofs is collected into the initial rainwater flow device through the collection pipe network. First, the rainwater with more sediment particles in the initial stage of rainfall is intercepted and removed, then the rainwater enters the reservoir for storage through the waste flow pool device, and then enters the high-efficiency air flotation device through the lift pump to degrade pollutants such as COD in the rainwater.
The treated clean reclaimed water flows into the clean water pool for disinfection, and then is pressurized by the variable frequency pump and transported to various water consumption points, mainly for greening and watering. According to the relevant person in charge of Zhejiang Jiaxing Vanke Real Estate Development Co., Ltd., if tap water is completely used as green irrigation water, according to tap water 3. 1 yuan/ton, it needs 2,403,653.1= 271.560 yuan a year, and the annual operating cost of water treatment equipment is 70,000 yuan, which can save nearly 200,000 yuan.
It is learned from the District Housing and Construction Bureau that this is a pilot project of rainwater utilization demonstration project in Xiuzhou District, and it is also the practice of low-impact development concept. Using natural ecology to purify rainwater is an ecological technology to reduce runoff, increase new water sources, reduce pollution and beautify the urban environment.
In the process of community construction, directly designing rainwater reuse project can greatly reduce the government's investment in large sewage treatment plants, sewage collection pipelines and expansion of flood discharge facilities, which not only solves the problems of rainwater overflow in rainy season and water consumption in dry season, but also reduces the load of sewage treatment plants, improves the treatment effect of urban sewage treatment plants, reduces the pressure of urban flood control and saves the load of drainage pipe network under closed roads.
The new community can have a rainwater recycling system, so what about those who live in the old community? We live on the top floor, and in the rainy season, there will be raindrops on the roof and walls more or less. Can this problem be solved? Regarding whether rainwater reuse can only be used for new residential areas and other issues of general concern to the public, experts from the District Housing and Construction Bureau said that how to do rainwater reuse well has always been a topic in Xiuzhou District's low-impact development concept. For old residential areas, we can pay attention to the construction of roof rainwater collection project.
At the same time, this low-impact development will penetrate into the construction of ecological greening roads. It can not only increase the infiltration of rainwater on both sides of the road, replenish shallow groundwater, but also play a role in purification. In addition, Jiaxing, as the only pilot city selected for sponge city construction in Zhejiang Province this year, how to do a good job in rainwater infiltration, storage and net utilization? How to transform the demonstration area? The specific implementation plan of Xiuzhou District is under further study.