| Green building is guided by the sustainable development idea, advocates the recycling of water and reclaimed water treatment, and makes the integrated efficiency of water supply and drainage system to achieve optimization, thereby reducing energy consumption and achieving non-waste and non-pollution. It is required that building must have their own technical systems in the development process. In these technologies, design ideas of water conservation and utilization of water resources technologies in building are closely bound up with energy saving and resources recycle. In order to realize water conservation and reasonable utilization of water resources, the water supply and drainage design and architectural design must develop jointly, at the same time, it can realize the perfect effect of holistic energy saving in building. Therefore, putting forward the water conservation and utilization of water resources technology measures of green building will offer basis to the water supply and drainage design, construction and management of green building in china.Starting off the principle and technical requirement of green building, according to design outlines in technical guidance of green building, it puts forward how to frame reasonable water resources programming according as local natural condition and collectivity programming of water resources, investigates reclaimed water technology, rainwater utilization technology, water saving instrument or equipment and other technologies, and analyzes their indicators.It indicates that reclaimed water technology is an important engineering technology measure of sustainable utilization of water resources in green building. It analyses how to choose system and water-head with reason according to actuality, how to ensure water quality and quantity of reclaimed water, and how to design and optimize water balance system, when design the equipments and facilities of reclaimed water. It emphasizes putting water quality in primacy, predigesting treatment craft based on the water quality pledge, and paying attention to the application of mature technologies and new technologies. It brings forward six indicators including water saving rate (C1), rate of wastewater reuse (Rr), rate of full load (Rf), rate of water quality achievable standard, cost of a ton of reclaimed water (AC) and output-input ratio (OIR), which can be used to evaluate the design, operation and management of reclaimed water project in green building. Rainwater recycling and makeup water system are effective technology measures of water resources utilization in green building. It considers that rainwater recycling can reduce rainwater discharge, but not reduce wastewater discharge. It investigates roof rainwater collection and utilization system and roof garden system. Analyses the merit and disadvantage of four rainwater infiltration technologies including infiltration ground, infiltration pipe and channel, filter pool and filter basin. Based on the daily rainfall data, it puts forward two water saving indicators including rainwater availability ratio (RY) and water saving rate (C2) of roof rainwater collection and utilization system, and empolders calculation software by computer java language. Finally, two indicators are verified and evaluated by example.The application of water saving instrument or equipment in green building may save water, economic benefit is immediate, water saving presumes energy saving, pollution reducation, and environmental protection. Based on the definition of water saving instrument, it introduces several water saving instrument including water saving tip, water saving commode, water saving washer and so on. In allusion to different architecture style, it puts forward two indicators including water saving rate (C3) and water saving equipment adoptive rate (RE). And two indicators are analysed by example.Green building needs to scientifically realize water and energy saving via reasonably choosing water supply system. It considers that some conventional water supply in building will be satisfied with standard in green building by reasonable exertion. Advocates virescence water and landscape water make use of non- traditional water resources. Emphasizes the function of virescence environment, and indicates how to live up to saving water and protecting ecological environment by virescence. Considers virescence irrigation needs to adopt spray irrigation technology, micro-irrigation and filtration irrigation are more water conservation than spray irrigation, and have more economic benefit. Indicates virescence irrigation should avoid cramming and landscape engineering should avoid eutrophication, when they adopt recycling water. It analyses ecological lavatories application in green building on the basis of their style and technical characteristic. |
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