Scientifically, how do you define grey water?

Reclaimed water is called reclaimed water because its water quality is between water supply (upper water) and drainage (lower water). The building water system is a water supply system that reuses the domestic sewage and wastewater used in the building or community as miscellaneous water after proper treatment, and it is suitable for cities with serious water shortage and areas with lack of fresh water resources. Reclaimed water is also the standard water treated by sewage treatment plants, which is generally secondary treatment, which has the advantages of not being affected by climate, not competing for water with neighboring areas, desirable on the spot, stable and reliable, and high guarantee rate.

Reclaimed water is the so-called"Medium water"It is a Japanese name, and people usually call tap water"Get on the water", call sewage"Get into the water", and the quality of reclaimed water is between the upper water and the lower water, hence the name"Medium water".Although reclaimed water is not drinkable, it can be used in some occasions with low water quality requirements, such as flushing toilets, washing cars, spraying roads, greening, etc. Reclaimed water engineering technology can be regarded as a miscellaneous water supply technology between the domestic water supply system and the drainage system of the building.

The water quality index of reclaimed water is lower than that of drinking water quality in urban water supply, but higher than the discharge standard of polluted water that is allowed to be discharged into surface water bodies.

Reclaimed water is the city's second source of water. Urban sewage recycling is one of the effective ways to improve the comprehensive utilization rate of water resources and reduce water pollution. The rational reuse of reclaimed water can not only reduce water environmental pollution, but also alleviate the contradiction of water shortage, which is an important measure to implement sustainable development.

The recycling and recycling of sewage has considerable social, environmental and economic benefits, and has become a necessary choice for countries around the world to solve water problems.

Reclaimed water is a very valuable water resource due to its large quantity, stable water quality, and little influence by seasons and climate. There are many ways to use reclaimed water, which can be divided into direct use and indirect use according to the relationship with users, and direct use can be divided into local use and centralized use. In most countries, reclaimed water is mainly used for irrigation of farmland, mainly indirectly; In a few countries, such as Japan, reclaimed water is mainly used for urban non-potable water, mainly for local use; The new trend is to use it in urban environments"Water features"environmental water.

Domestic sewage is used as a water source, and after proper treatment, it is used as miscellaneous water, and its water quality index is between the upper water and the lower water, which is called reclaimed water, and the corresponding technology is called reclaimed water technology. The treated grey water can be used for toilet flushing, garden irrigation, road cleaning, urban fountains, etc. For the lack of freshwater resources and serious shortage of urban water supply, the use of reclaimed water technology can not only save water sources, but also make sewage harmless, which is an important way to prevent and control water pollution, and is also a new technology and new process that China will focus on promoting for a long time at present and in the future.

Reclaimed water mainly refers to non-potable water that can be reused within a certain range after the treatment of urban sewage or domestic sewage to meet certain water quality standards, and its water quality is between upper water and lower water, and reclaimed water reuse is to reuse urban sewage as a renewable resource after treatment. Due to the stable volume of urban wastewater and the economical investment in infrastructure, many countries have adopted reclaimed water reuse as the preferred solution to solve the problem of water shortage. Therefore, the reuse of reclaimed water has shown the dual effect of open source and pollution reduction.

Reclaimed water is reclaimed water, and reclaimed water refers to the water that can be used beneficially after wastewater or rainwater is properly treated to meet certain water quality indicators, meet certain use requirements, and can be used beneficially. Compared with seawater desalination and cross-basin water transfer, reclaimed water has obvious advantages. From an economic point of view, the cost of reclaimed water is the lowest, and from the perspective of environmental protection, sewage recycling helps to improve the ecological environment and achieve a virtuous cycle of water ecology.

The water after deep purification of urban sewage by treatment facilities (including water after secondary treatment and further treatment in sewage treatment plants and centralized treated water such as bathing water and vegetable washing water in large buildings and living communities) is collectively referred to as "reclaimed water", because its water quality is between tap water (top water) and sewage discharged into pipelines (sewage), so it is also called "reclaimed water".

Reclaimed water use.

Reclaimed water has many uses, such as farmland irrigation, landscaping (parks, campuses, highway green belts, golf courses, cemeteries, green belts and residential areas, etc.), industry (cooling water, boiler water process water), large building washing, and recreation and environment (improving lakes, ponds, marshes, increasing river water flow and fish farming, etc.), as well as municipal miscellaneous uses such as fire protection, air conditioning and water flushing.

According to the use of reclaimed water, reclaimed water can be reused for groundwater recharge, industrial water, agriculture, forestry, animal husbandry, urban non-potable water, landscape environment water and other five categories.

Reclaimed water, also known as reclaimed water, refers to the water that can be used beneficially after wastewater or rainwater is properly treated to meet certain water quality indicators, meet certain use requirements, and can be used beneficially.

The name "reclaimed water" is derived from Japan, and there are many interpretations of the definition of "reclaimed water" in the case of sewage works, and "reclaimed water" in the case of factories.

Upper water: The tap water that you usually drink is the upper water.

Sewerage: Domestic sewage and industrial wastewater are collectively referred to as sewerage.

Reclaimed water: Reclaimed water after sewage treatment is called "reclaimed water".

For example, it is used as cooling water in thermal power plants, car washing, toilet flushing, watering lawns, etc. There are many interpretations of the definition of reclaimed water, which is called "reclaimed water" in sewage engineering, and "recycled water" or "reclaimed water" in factories, which is generally marked by water quality requirements.

In conclusion, grey water is generally not drinkable. In today's situation where the contradiction between water supply and demand is very acute, the use of "reclaimed water" reuse technology can effectively open up the "second water source" and greatly reduce the consumption of "upper water".

It refers to the water that can be used beneficially after proper treatment to reach a certain water quality index and meet certain use requirements, which is called reclaimed water. Reclaimed water, also known as "reclaimed water", has very obvious advantages over seawater desalination and cross-basin water transfer. In general, the cost of desalination of seawater is about 5 7 yuan tons, the cost of inter-basin water transfer is about 5 20 yuan tons, and the cost of reclaimed water is about 1 3 yuan tons, so from an economic point of view, the cost of reclaimed water is the lowest.

From the perspective of environmental protection, sewage recycling helps to protect the ecological environment and can realize a virtuous cycle of water ecology.

Reclaimed water is the standard water treated by the sewage treatment plant, which is generally secondary treatment, which is not affected by the climate and does not compete for water with neighboring areas, and has the advantages of local preferability, stability and reliability, and high guarantee rate.

Reclaimed water is commonly referred to as "reclaimed water", which is called "reclaimed water" in Japan, and the quality of reclaimed water is between upper and lower water, so it is called "reclaimed water". Reclaimed water can be used to flush toilets, cars, spray roads, greenery and other places that do not require high water quality. Reclaimed water engineering technology is a miscellaneous water supply technology between the domestic water supply system and the drainage system of the building.

The water quality index of reclaimed water is higher than that of polluted water, which meets the discharge standard for discharging into surface water bodies, but is lower than that of drinking water quality index in urban water supply.

Reclaimed water is the city's second source of water. Urban sewage recycling is one of the effective ways to improve the comprehensive utilization rate of water resources and reduce water pollution. The rational reuse of reclaimed water can not only reduce water pollution, but also effectively alleviate the contradiction of water shortage, which is an important measure to implement sustainable development.

The recycling and recycling of sewage has considerable social, environmental and economic benefits, and has become an inevitable choice for countries around the world to solve water problems.

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