Development trend and existing problems of water reuse in buildings?

What are the development trends and existing problems of reclaimed water reuse in buildings? Zhong Da Consulting will answer your questions below.

1 preface

At present, there is a great shortage of fresh water resources in China, and due to the acceleration of urbanization and the rapid development of China's economy, the sewage discharge and water consumption of cities have also increased sharply, further aggravating the deterioration of water environment and the shortage of water resources. At the same time, it has also brought environmental problems to many cities and restricted the development of regional economy. Reclaimed water reuse is not only the most fundamental way to coordinate urban water environment and water resources, but also an important way to solve the urban water crisis. Construction water refers to non-edible miscellaneous water that can be reused within the specified range after domestic sewage or urban sewage has been treated to meet the water quality standards required by the specification. The water quality in the building is between sewage and water, which is one of the forms of effective utilization of water resources.

2 Water sources in the building

Water sources in the building include toilet drainage, laundry drainage, toilet drainage, kitchen drainage and bath drainage. Considering the difficulty and cost of treatment, the order of water in the building can be sorted as follows: bathing drainage, washing drainage, laundry drainage, kitchen drainage and bathroom drainage.

The common designs of water system combination in buildings are: (1) All the domestic sewage we call, and the most polluted one is called domestic sewage. Because its water quality is difficult to treat and the treatment cost is relatively high, this kind of water should not be used as the water source of the building when designing the water system in the building. (2) The pollution degree of domestic drainage combination except toilet flushing drainage is lighter than that of domestic drainage, and the pollution degree of this kind of sewage is moderate, which we call miscellaneous drainage; (3) Bathtub drainage, toilet drainage and air conditioning system drainage, etc. The pollution degree is relatively light, which is called high-quality miscellaneous drainage. This kind of water quality should be given priority as the source of reclaimed water when designing the reclaimed water system in buildings.

At present, judging from the water sources used in the reclaimed water reuse system in buildings in China, almost all reclaimed water reuse systems in most buildings use miscellaneous drainage or high-quality miscellaneous drainage.

3 Development trend of reclaimed water reuse in buildings

(1) Reclaimed water in buildings will further promote the reform of property management and the construction of energy-saving and environmental-friendly ecological communities. Through the in-depth development of water reuse in buildings, people can achieve the goal of controlling water pollution and saving water resources, so that the social concept of "environment-friendly" and "resource-saving" will gradually take root in people's hearts, improve people's enthusiasm for environmental protection, and promote the popularization and application of new technologies such as saving materials, energy, water and land.

(2) The development trend of water facilities in buildings will be collectivized. At present, due to the increasing water consumption of buildings, it will break through the situation of "fragmentation" of a single residential area and a single building, taking into account the investment of pipe network and scale effect, showing the phenomenon that several residential areas and a building complex are building a moderate-scale reclaimed water recycling facility. This moderate concentration is conducive to improving efficiency and management level and reducing investment.

(3) With the continuous improvement of relevant standards, norms, policies and regulations on reclaimed water reuse in buildings, the industrialization trend of reclaimed water reuse system in buildings is more obvious. It is embodied in the following aspects: 1) The benign interaction between supervision, technology and capital has improved the public's enthusiasm for using reclaimed water and provided a good and powerful guarantee for the safe use of reclaimed water reuse system in buildings; 2) After the relevant standards are issued, the operation, construction and design of water reuse facilities in buildings will be gradually standardized to create a better application environment for the water reuse system in buildings; 3) At present, with the clarification of a series of relationships such as tap water price and building water price and the intervention of social capital, the passive situation of building water facilities construction has been improved.

(4) With the maturity of building water treatment technology, the scope of building water reuse is gradually expanding. With the rapid development of urbanization in China today, the reuse of water in buildings has a broad development prospect. The reason is that compared with centralized recycling, the recycling of water in buildings is more economical, adaptable and flexible. Due to the strong demand, the future building water treatment technology will develop in the direction of maturity, diversification, automation, integration, miniaturization and installation to meet the requirements of improving safety and reliability and saving space.

(5) The ways of water reuse in buildings are gradually diversified. The reuse of water in buildings in China is not limited to the direct reuse of "pipe to pipe", such as greening and flushing toilets, but tends to be used indirectly for landscape water bodies. This has two advantages. On the one hand, a good water ecological landscape can improve the quality of human living environment, on the other hand, it can reduce the risk of reuse and improve the public's acceptance of reclaimed water reuse.

4 problems in building water reuse

There are many problems in the process of water reuse in buildings. First of all, in practical engineering, reclaimed water reuse is not more economical than using urban water supply. Through the investigation of 22 operating reclaimed water facilities in a city, it is found that most of them have problems such as high operating cost and insufficient utilization rate of facilities. Some even have a total operating cost as high as1137 yuan /m3, and the average level of total operating cost is as high as 3 124 yuan /m3. The main reason is that reclaimed water facilities cannot be fully utilized.

Secondly, due to the abnormal operation of the reclaimed water system and the unstable water quantity and quality, it is difficult for people to use it with confidence. The direct cause of this phenomenon is that some equipment and processes can not meet the requirements. At the same time, the operation and management level of the whole reclaimed water reuse system is not high, and the problems can not be solved in time, which makes the water quantity and quality often fluctuate greatly, and even leads to the shutdown of the whole reclaimed water reuse system.

5 Summary and prospect

As far as the development of building water is concerned, there are still many problems in practice, which seriously restrict the development of building water. Mainly in the following aspects:

(1) The laws and regulations on reclaimed water reuse are not perfect, and supporting policies are lacking; (2) The innovation consciousness and market mechanism of reclaimed water project construction management are not perfect; (3) Users' understanding of reclaimed water engineering needs to be improved; (4) Lack of sufficient economic incentives, and the water price system adapted to the market mechanism has not yet been established.

In the process of reclaimed water reuse, we should give full play to the role of various government departments and let them participate in the development of reclaimed water and do their best. Because this project is a very arduous and complicated social project, it is absolutely not enough to rely on the efforts of a certain unit or department. To solve many problems of reclaimed water utilization, we need strong supervision and correct guidance, and we need to take some measures in propaganda, technology, economy, administration and law. First of all, in order to eliminate users' concerns about using reclaimed water and improve users' further understanding of reclaimed water, it is necessary to strengthen publicity. Strengthen the understanding of the social benefits and long-term economy of reclaimed water facilities construction, and at the same time adopt incentive mechanism to subsidize the economy in order to mobilize the enthusiasm of reclaimed water construction. Secondly, the reclaimed water reuse project is regarded as an important measure to effectively utilize water resources, and the "sustainable development strategy" is the core strategy, and the reclaimed water reuse is included in the overall urban construction plan; Finally, comprehensive industry standards and special regulations regulating the management, construction, design and operation of reclaimed water should be formulated and promulgated as soon as possible.

The reuse of water in buildings, on the one hand, solves the problem of sewage pollution to water sources, thus protecting water sources; On the other hand, it opens up a second water source for urban water supply, reducing the consumption of tap water to a certain extent. Reclaimed water reuse has high environmental and social benefits, which not only reduces environmental pollution and pollution, but also reduces the over-exploitation of water resources, and has a far-reaching impact on the sustainable development of China's social economy. Therefore, the use prospect of building water will be more and more broad.

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