Uses: In the city life, the production of water, about 40% of the water is in close contact with people living on the water demanding. And up to 60% of the water used in industrial water, agricultural irrigation, water and green water, sanitation and other aspects, such as replacement of water with this part, the water quality standard is completely permissible, while saving a large amount of fresh water. Present in industrial cooling water and plant operation closely, water is relatively stable. With the continuous construction of urban infrastructure development, the corresponding sanitation, green, landscape and other aspects of municipal miscellaneous water also increases, for the convenience of water and water supply in the form of a higher diversity of requirements, water potential is relatively large. We consider the following aspects should promote the use of water:
　　1、Landscaping water use include the following:

　　㈠、Green water
 According to garden, green sector basis for the calculation of green water: water per square meter per day 0.002m3. The water park is based on actual survey measured the average number of years of estimated water park out. Actually reach the park gardens green water standards prescribed by the department 0.002 m3/d.m2 per square meter per day standard, the peak in the summer, within one month of water consumption is higher than this value, in other time to Less than this value, especially in the winter without water, so the actual average water consumption of only 0.00153 m3 / d.m2. Are due to the current park as a green lake water or groundwater, the price is low. The price of water in hard water or groundwater level drops, it is recommended that the Government should effectively restrict river water, groundwater used for greening, and to provide appropriate water prices, water for greening the economy is a feasible and reasonable and necessary The.
　　㈡、Pay lakes
 In order to maintain good water quality of the park lake, and some flood regulation and storage capacity, each of the moat should pay on time to all the park several times. River and lake water quality by measuring the current situation and "surface water quality standards, "the comparative analysis of the status of river water can only reach Ⅴ class standard, to make the river and lake water quality Ⅳ class, it should increase the mobility of water in frequent Replacement to maintain quality of fresh, anaerobic conditions to avoid the appearance of the lake. Present in the water lines had been extended to the lake of the park, so that made ​​it possible for the continuous replenishment, so that the complement of water per year on average 6-8 times a week or less assigned to the period of time, the lake body is constantly The flow of self-renewal. On the other hand, using water instead of fresh water in rivers and lakes supply water to the water to completely meet the requirements, but also for the country save a lot of fresh water, and water from seasonal effects. The impact of water use by the user, such as industrial water and rivers without pay, in the winter without water users will face the problem. Therefore, water projects in the planning stage of the rivers and lakes should be guaranteed a certain amount of pay, to ensure that within one year of the efficiency of water use, to avoid idleness.　
　　㈢、Park, flush toilets
 Another use of water is flushing the toilet, dual water supply can be achieved in the bathroom. Water for flushing the toilet can save a lot of clean water. Beijing public toilet in order to change the status of poor sanitation, but also to host the 2008 Olympic Games in Beijing, the need and they should be vigorously promoted to the second-class toilet (manual cleaning twice a day) of the transformation, in particular, frequented by several foreign friends Park should be as soon as possible, so that the toilet water park will continue to increase. If you use the water fully meet the requirements.　　     ㈣、Park roads washed
 In order to achieve the park road erosion, and should strengthen investment in equipment, water tankers for the parks with facilities such as landscape irrigation departments to develop comprehensive road program, realization of surface water rinse once a day in order to improve the roads within the park landscape level.

　　2、With the comprehensive management of urban environment to play in the water effect
 The high dust content of air result in more serious air pollution in our city is an important reason, the current respirable particulate air pollution in Beijing has become the primary pollutant, and according to the National Weather Service experts predict that China has entered a stage of multiple dust storms. We should take effective measures to effectively reduce airborne respirable particulate matter, sand in the governance should be strengthened, while artificial dust.The current manual method of dust is time to send water tankers poured sanitation sector road, due to the limited volume of water poured water board range of dust is not ideal pressure purposes. Therefore, the methods we may learn from foreign countries, along the main roads in the city of laying water lines, and be equipped with the appropriate heads, in the premise of ensuring adequate water can be sprayed water tankers to the existing surface water irrigation, increased pressure Dust effects. Can first select a particular section of the pilot, the use of water tankers and nozzle combination, the progressive realization of dust in the water.

　　3、Water for district
 Water into the area to achieve water-saving dual water supply is to build an important manifestation of the city, the district of flushing water, green water, car washing, etc. can be used in the water instead. Water into the area in order to increase the water should first be propaganda spread in the community the concept of water, and enhance awareness of water conservation, through various forms of propaganda loved the gradual elimination of psychological barriers people. Second, to develop appropriate laws and regulations, and strengthen laws and regulations binding, taking into account the planning stage to ensure that residential water reuse. Again, the innovation should be applied in water treatment technology to work hard, study more economical and practical treatment approaches to improve water quality, and expand the scope of residential use.

　　4、Water washing
The rapid increase in the number of cars, with the corresponding washing stations should also be increased in order to meet the use needs. Rinse with fresh water but for vehicles, many cities are very difficult to accept water continue to increase car wash site. If you use the water without running water for washing the problem does not exist, the water quality and quantity to meet the requirements on both, and has the following advantages: First. save water;Second. in the water washing water must be better than the current low price, easy to accept the extension of the user is easier; third. water is rich can save the investment cycle facilities, car wash for the introduction of advanced equipment to improve efficiency. IV. can play the publicity effect of washing stations, water pipelines in the shop have been appropriate to place the construction of more car wash site to promote water use, giving a more visual impression.　　5、Industrial cooling water
 Large amount of industrial cooling water, and not subject to seasonal effects, the water reuse project should be fully considered in the planning stage of industrial users.

 Treatment and its process: water reuse wastewater treatment process based on quality, quantity and water quality and quantity of water reuse requirements, considering the economic and technical parameters, to determine the best treatment process. Wastewater treatment processes currently used to the depth of secondary biological treatment plus three main processing unit. Different water quality requirements, the treatment process is also different. Commonly used method in water treatment, including biological treatment, physicochemical treatment method.