Shenzhen is located in South China, with the annual average rainfall 1966.3mm, the annual average total water resources of 20.565,438+0× 65,438+0.08m3, and the per capita water resources of 250 m3(2005). The per capita freshwater resources are only one-ninth of that of the whole country and one-sixth of that of Guangdong Province. The shortage of fresh water resources has a great impact on people's life and economic development in Shenzhen. The municipal government implements the policy of leaning towards water and vigorously strengthens the construction of urban water supply projects. Under the water supply guarantee rate of 97%, the total available water supply of existing water source projects in the city is 15.04× 108m3. After the implementation of the second phase of the East-to-North Water Transfer Project, the total available water supply of the city's water source project is 19.27× 108m3 with 97% water supply guarantee rate, of which 65438+ comes from overseas. With the development of population, economy and society, the water consumption in Shenzhen will continue to increase in the future. It is predicted that the population of Shenzhen will reach 1.0 1.4 million in 2020, and the GDP will reach 2 trillion yuan. It is estimated that the water demand will reach 26× 1.08 m3 by then.
Shenzhen's water supply sources are mainly overseas water transfer and local water, and a small amount of groundwater and seawater utilization. Overseas water transfer mainly depends on two overseas water transfer projects: Shen Dong Water Supply Project and East Water Supply Project. The main water supply pipe network and its branches, Longkou-Xikeng water supply project, North Ring Pipeline and Shawan Pumping Station on the east side of Shenzhen Reservoir are used as raw water transmission and distribution systems to realize the interconnection and rational allocation of Shen Dong water diversion, east water diversion and local water sources. The overseas water transfer project is combined with the local water storage project to form the urban water supply network system.
Shenzhen urban water supply plant belongs to multi-center and group layout, with a wide range of construction sites and uneven water supply scale and technical conditions. There are large waterworks with advanced facilities, equipment and technology, as well as small and medium-sized waterworks with simple facilities and equipment, which are outdated and backward. At present, there are nearly 27 water supply enterprises and 59 water plants in the city, with daily water supply capacity of about 590.5× 104m3, water supply pipeline length of about 1.3× 104km, and water consumption population of nearly130,000. In 2006, the total water supply of major water supply enterprises in the city was 65438+.
Second, the present situation of urban water resources
(1) Hydrometeorology
Shenzhen has a subtropical maritime monsoon climate with abundant rainfall and long sunshine hours. The annual average temperature is 225℃, the measured maximum temperature is 38.7℃, the measured minimum temperature is 0.2℃, the frost-free period is 355 days, the annual average sunshine hours 1933.8h, and the annual average humidity is 76.8%. Located in the East Asian monsoon region, the city is controlled by monsoon circulation, and the air flow alternates obviously in winter and summer, which affects the climate change in four seasons. The ocean has a great influence on the climate of this city, which makes the annual range and diurnal range of temperature in Shenzhen smaller, with heavy annual rainfall, rainy days and high atmospheric temperature. The existence of landforms such as coastal mountains makes the difference between north and south in winter, and the wind speed decreases from south to north.
(2) Rainfall
The average annual rainfall in Shenzhen is1966.3 m m, and the regional distribution of precipitation is mainly affected by coastal mountains and other geomorphic zones, showing a decreasing trend from southeast to northwest. Average annual rainfall: more than 2,000 m in the eastern region,1700 ~ 2,000 m in the central region and less than 1700mm in the western region.
From the analysis of the causes of precipitation in Shenzhen, typhoon rainfall caused by typhoon accounts for a large proportion in the annual precipitation. According to the statistics of 30 years from 1950 to 1979, the annual average typhoon rainfall is 689.0mm, accounting for 36% of the annual average rainfall. The typhoon rainfall in the largest year can reach 1648mm( 1964), accounting for 69% of the rainfall in that year. Another feature of precipitation in Shenzhen is its high precipitation intensity and heavy rainfall. The average annual rainstorm for many years accounts for about 40% of the annual precipitation. The distribution of rainfall is very uneven during the year, and the average annual rainfall from April to September accounts for 85.3% of the annual rainfall.
(3) evaporation
Shenzhen has a hot climate, strong wind, large average rainfall for many years and large evaporation on the water surface. According to the statistical calculation of many years' data, the average evaporation for many years is1752 mm.
The distribution of water surface evaporation is uneven during the year. During the flood season (April-September), the temperature is high, and the water surface evaporation is large, accounting for 54.8% of the whole year. In non-flood season (10 to March of the following year), the temperature is low, and the water surface evaporation is small, accounting for 45.2% of the whole year.
Through analysis, the evaporation of reservoirs in Shenzhen tends to increase after 1980, and the evaporation of water surface after 1990 has obviously increased compared with 1980 ~ 1990, with an increase rate of 16%.
The general trend of evaporation space change is decreasing from southeast to northwest inland (Figure 2- 1-8).
Figure 2- 1-8 Process line of evaporation change in Tiegang Reservoir
(d) Total water resources
The total amount of water resources in a certain area refers to the surface and groundwater output formed by local precipitation, that is, the sum of surface runoff and groundwater resources.
1. Surface water resources
Surface runoff in Shenzhen is mainly supplied by rainfall. According to the comprehensive planning results of water resources in Shenzhen, the average annual runoff in Shenzhen is19.18×108m3, and the annual runoff is18.28×108 when the guarantee rate is 50%, 75% and 97%.
2. Groundwater resources
According to its occurrence conditions, hydraulic properties and hydraulic characteristics, groundwater in Shenzhen can be divided into three types: loose rock pore water, bedrock fissure water and karst water. The total reserves of groundwater resources are 10.34× 108m3, of which the groundwater reserves in the form of runoff are about 5.85× 108m3 (i.e. changeable reserves).
3. Total water resources
According to the above analysis, the total surface water resources in Shenzhen are19.18×108m3, and the total groundwater resources are 5.65× 108m3. After deducting the repeated calculation of 4.34× 108m3, the total water resources in Shenzhen is 20.5× 108m3.
About 56% of the city's annual average precipitation 1966.3mm forms river runoff, and the remaining 44% is consumed by evapotranspiration and phreatic evaporation of surface water, vegetation and soil. 23% of the annual precipitation seeps into the ground to replenish groundwater and becomes groundwater resources, and the rest is mainly consumed by phreatic water evaporation. This is basically in line with the natural geographical characteristics of Shenzhen and the transformation law of precipitation, surface water and groundwater.
4. River system
There are more than 3 10 large and small rivers (including their tributaries) in Shenzhen, including 69 rivers with basin area greater than 10 km2 and 5 rivers with basin area greater than 100 km2, mainly Guanlan River, Longgang River, Pingshan River, Shenzhen River and Maozhou River. Among the 3 10 rivers, 7 1 0 rivers are tidal rivers. The large number, wide distribution and short main stream of small watersheds are a major feature of Shenzhen water system.
See table 2- 1-7 for the general situation of major rivers in Shenzhen.
Table 2- 1-7 Overview of Main Rivers in Shenzhen
sequential
5. Current situation of water supply
Water supply in Shenzhen mainly comes from domestic small and medium-sized water storage projects and overseas water transfer projects, and groundwater projects are generally used as self-provided water sources for some manufacturers.
Figure 2-1-9 Water supply statistics of Shenzhen in 2006
In 2006, the city's total water supply was17.31×108m3, of which the total amount of water transferred from overseas was11.89×108m3, accounting for 68.7% of the total water supply. The special zone is 5.3 1× 108m3, Baoan district is 3.76× 108m3 and Longgang district is 2.82× 108m3. Water supply is from surface water supply 16.76× 108m3, accounting for 68.7% of the total water supply, underground water supply is 554 1× 104m3, accounting for 3.2% of the total water supply, and sewage treatment and reuse is 42×104m. See table 2- 1-8 for the water supply of each administrative district in Shenzhen in 2006, and see figure 2- 1-9 for the statistical chart of water supply.
Table 2-1-8 Water supply units in Shenzhen in 2006: × 104m 3
Third, the present situation of water supply project
(A) water supply mode
At present, in terms of water supply pattern, Shenzhen has formed a water supply pattern of three major units, namely, the area within the Special Economic Zone, Baoan District (including Guangming New District) and Longgang District.
The development of water source and raw water distribution network in the special zone is relatively perfect, and a water supply system has been initially formed, in which water is supplied from the north central water main to the east deep water and from the main water supply network to the east water. During the maintenance period of overseas projects, the water supply is mainly regulated by Shenzhen, Meilin, Xili and Changlingbei reservoirs.
Bao 'an District mainly uses the trunk line of water supply network to introduce the eastern water, and Longxi Project introduces the eastern deep water, combining Tiegang, Shiyan and Changliupi Reservoir to form the main water supply source network. Among them, the central and western parts of Baoan District (Baoan Center Group, Western High-tech Group, and Western Industrial Group) mainly rely on the raw water introduced from the east by Tieshi Branch Line and Songshi Branch Line, as well as the storage capacity of Tiegang and Shiyan Reservoir. Longhua District and Guanlan District (central comprehensive group) in the east mainly take deep water from Longkou Pumping Station through Xikeng Reservoir.
The water source in Longgang area consists of three parts: eastern water source, eastern deep water source and local water source. The local water resources are relatively scarce, and only a small amount of water can be used in each street. Most of the raw water is supplied by the eastern water supply project and Shen Dong water supply project, among which the eastern raw water is supplied by the water supply network trunk line, Pingdi branch line, Henggang storage project, Dashanbei emergency water supply project and Bingkeng Reservoir emergency water supply project. Raw water in Shen Dong is provided by Longkou Pumping Station and Shawan Pumping Station. The raw water project of Dapeng Peninsula under construction will send the water in the east to Jiaoshui Reservoir for storage, and then to Jingxin Reservoir in Kwai Chung for supply to Dapeng Peninsula.
(2) Water supply project
The present situation of water supply projects in Shenzhen mainly includes overseas water transfer projects, water transmission and distribution projects, water storage projects and a small amount of water lifting, groundwater and seawater utilization projects.
1. Overseas water transfer project
Shenzhen's overseas water source comes from Dongjiang River. Shen Dong Water Supply Project and East Water Supply Project are two major overseas water source projects in Shenzhen.
Dongshen Water Supply Project is a large-scale inter-basin water transfer project, which supplies Dongjiang raw water to Hong Kong, Shenzhen and Dongguan along the project. The design water supply scale of this project is 24.23× 108 m 3/a, the design flow is 100m3/s, and its water consumption distribution is: Hong Kong11.0×108m3 and Shenzhen 8.73×/.
The East Water Supply Project is divided into two phases. The water intake scale of the first phase project is 3.5× 108 m 3/a, and the design flow is15m3/s. At present, the second phase project of Dongshuiyuan is under construction, with the water intake scale of 3.7× 108m3/a and the design flow of15m3/s.
2. Water transmission and distribution projects
In order to realize the joint dispatch of overseas water transfer and local reservoirs, Shenzhen has built water supply network trunk line, north ring water transfer trunk line and north line water transfer project. , connecting Shenzhen, Xili, Songzikeng, Qinglinjing, Tiegang and Shiyan Reservoir through the branch lines such as Tieshi Branch Line, Songshi Branch Line, Pingdi Branch Line, Henggang Storage Project and Longkou-Xikeng Water Supply Project, and delivering Dongjiang raw water to all districts in the city. At present, there are 15 auxiliary water branches at all levels in the city, with a total length of 2 13.7km.
3. Water storage project
By 2006, there were a total of 73 water storage reservoirs 173, including 24 water supply reservoirs 10, 62 small (1) reservoirs, and 52 small (2) reservoirs, with 50% and 75% water supply reservoirs.
4. Other water supply projects
At present, there are two large-scale river diversion projects in Shenzhen, which are located in Maozhou River and Guanlan River respectively. The water lifting capacity of Maozhou River is 5 m 3/s, and that of Guanlan River is 6 m3/s ... There are still a few groundwater exploitation projects in the city every year, with an annual exploitation amount of about 0.55× 108 m 3, including shallow groundwater of 0.23× 108m3 and deep groundwater of 0.32× 108m3. Shenzhen is a region rich in seawater resources. At present, there is no seawater desalination project in our city, and seawater is basically used as industrial cooling water for power enterprises. In 2006, the direct utilization of seawater in Shenzhen was 72.9× 108m3.
Four, urban water supply project planning and implementation
(A) water conservancy planning model
In order to ensure the safety of water supply in Shenzhen, the city plans to build and expand reservoirs, build standby water source projects, develop non-traditional water resources utilization, improve the construction of water supply pipe network and supporting water plants.
Through the rational allocation of water resources, the overall layout of urban water supply in Shenzhen will take Dongjiang runoff, self-produced water and seawater from local reservoirs as the "sources", the eastern water supply project, Shen Dong water supply project, water supply network trunk line and north diversion project as the "lines", the reservoirs such as Shenzhen, Tiegang, Gong Ming, Songzikeng, Qinglinjing and Bay as the "storage" centers and the water purification plants as the "points".
(2) Water source construction
1) construction of overseas water source project: the second phase of eastern water supply project was completed.
2) Water storage project construction: three new reservoirs, namely, Tung Chung Reservoir, Dongzi Reservoir and Jingzi Reservoir, will be built; Expansion of Tiegang Reservoir, Tongluojing Reservoir, Changlingpi Reservoir, Songzikeng Reservoir, Ejing Reservoir, Jingxin Reservoir, Gankeng Reservoir, Tiekeng Reservoir and Damali Reservoir. Under the 97% guarantee rate of new and expanded reservoirs, the water supply will be increased by 1960× 104m3, and the storage capacity will be increased by 1.20× 108m3.
3) Construction of standby water source: the water diversion and storage project of Qinglinjing, the water supply and storage project of Gong Ming and the Gulf Reservoir project will be completed, and the storage capacity will be increased by 4.0× 108m3.
4) Construction of water supply pipe network: water diversion project of northern line (120× 104m3/d), water supply project of Dapeng Peninsula branch line (Hu Sha-Kwai Chung section) (40× 104m3/d) and water source project of Dapeng Peninsula-Baguang branch line project (30× 6544)
5) Non-traditional water resources development and utilization: rainwater utilization project of Olympic Sports Center, rainwater utilization project of Longhua Second Line Development Zone, rainwater utilization project of Shenzhen Xiang Qiao Village Security Housing Community, rainwater utilization project of Longgang Senior Technical School and Lianhuashan Park; Carry out pilot projects of seawater desalination in Shekou (2.7× 104t/d), Nanshan Fuhuade Power Plant (0.2× 104t/d) and direct utilization of seawater in Yantian, Nanshan and Dapeng Peninsula; Construction of sewage reuse project areas with Nanshan, Futian, Binhe, Luofang, Xili, Caopu and other sewage treatment plants as the main body, and pilot projects of reclaimed water reuse in Shekou, Renmin Building, Bank of China Community, Jingshan Villa, Yue Zhong Community, Cuiyuan Community and Huafu Building.
(3) Urban Water Supply Plant
Newly-built Nanshan Waterworks, Sequoia Shanshui Waterworks, Guangming Waterworks, Zhu 'ao Waterworks (Phase IV), Fenghuang Waterworks, Shiyan Waterworks, Aote Lake Waterworks and Big Industrial City Waterworks; Expansion of Shekou Dong Bin Waterworks, Bijiashan Waterworks, Yantian Waterworks, Jiazitang Waterworks, Wuzhiba Waterworks, Guanlan Qiankeng Waterworks, Heao Waterworks, Nankeng Waterworks, Miaokeng Waterworks, Egongling Waterworks, Pingdi Waterworks and Central City Waterworks. The scale of new and expanded waterworks is 246×104m3/d/d.
Verb (abbreviation of verb) environmental impact assessment
(A) Water environment status of water supply sources
1. Water supply reservoir
According to the current situation investigation, the water quality of the main water supply reservoirs in Shenzhen is generally good, and most of them are Grade II water quality. Shenzhen Reservoir, Tiegang Reservoir and Jiao Reservoir all reached the first-class water quality standard in individual water periods, and the water quality situation was further improved. Among the 28 reservoirs that have been designated as water source protection areas in Shenzhen, only 7 reservoirs have exceeded the standard, of which 5 reservoirs have no routine monitoring sections, and the other 2 reservoirs are located in Shiyan Reservoir and Luotian Reservoir respectively. The main substances exceeding the standard are COD and permanganate. The main reason for exceeding the standard is the large contribution rate of COD in the inflow tributaries, so measures should be taken to further control the pollution load of the inflow tributaries. The nutritional status of drinking water sources in Shenzhen is generally good, and only a few reservoirs are slightly eutrophic, accounting for only 7% of the evaluated reservoirs. See table 2- 1-9 for the summary of water quality evaluation results of major reservoirs in Shenzhen in 2005.
2. Water lifting channels
According to the latest river survey results, due to the discharge of industrial wastewater and domestic sewage and the mixed flow of rain and sewage, all rivers in the city are polluted to varying degrees, and most of them fail to meet the water function and water quality requirements. As the water supply sources in Shenzhen, the environmental quality of Maozhou River and Guanlan River is deteriorating year by year, especially the water pollution problem.
Table 2-1-9 Summary of Water Quality Assessment Results of Main Reservoirs in Shenzhen in 2005
1) Maozhou River: The annual average values of dissolved oxygen, permanganate index, biochemical oxygen demand, non-ionic ammonia, volatile phenol, petroleum and total phosphorus in the upper reaches of Maozhou River exceed the Class III standard, while the monitoring values of suspended solids, nitrite nitrogen, total mercury, total cadmium and hexavalent chromium also exceed the standard, and the water quality is inferior to Class V, with the annual average values of suspended solids, dissolved oxygen, permanganate index and biochemical oxygen demand.
2) Guanlan River: The annual average values of dissolved oxygen, permanganate index, biochemical oxygen demand, nonionic ammonia, volatile phenol, petroleum and total phosphorus in Guanlan River exceed the Class III standard, and the monitoring values of suspended solids, nitrite nitrogen, total mercury, total cadmium and hexavalent chromium also exceed the standard, and the water quality is worse than Class V. ..
The shortage of local water resources in Shenzhen and the deterioration of water environment of existing water supply sources not only seriously affect the quality of urban landscape and human settlements, but also further aggravate the shortage of water resources.
(2) Water environmental protection planning
1. Planning objectives
Through the construction of water conservation forest and other measures to protect or restore the water ecosystem, curb the imbalance trend of local water supply water ecosystem and promote its virtuous circle. Ensure that the water quality compliance rate of urban drinking reservoir sources is increased from 98% to 100%. In the water source protection area, the average forest coverage rate is above 65%, and the forest canopy density is above 95%.
2. Main measures
1) Pollution source control: Pollution source control includes point source control and non-point source control of polluted water. The control of point source pollution focuses on pollution interception, sewage treatment and drainage system construction. Non-point source pollution control mainly includes ① source control; ② Combining lakeside greening with natural wetland to control non-point source pollution around the lake; ③ Terminal treatment.
2) Constructed wetland: Constructed wetland system is an ecological engineering measure constructed artificially by utilizing the sewage purification capacity of wetland. This measure is to use stones, sand, soil and other materials in a certain proportion to form a matrix, plant selected aquatic and hygrophytic plants, and form an engineering wetland system similar to a natural wetland state. Constructed wetlands are divided into floating plant system, emergent plant system and submerged plant system. Through the purification of substrates, plants and microorganisms, TN, TP, COD, BOD and heavy metals have a high removal rate, and the best ecological, economic and social benefits of sewage treatment and resource utilization can be obtained, which is one of the important engineering measures to control non-point source pollution.
3) Pre-reservoir: The original river basins and reservoirs are divided into main reservoir, pre-reservoir and upstream basin. The forepond can be regarded as a sewage treatment system. The upstream sewage is brought into the forepond before storage, and then discharged into the main pond after sedimentation, plant absorption and water quality clarification. Pre-reservoir can purify tap water directly entering the main reservoir, reduce pollutants in the source water of the main reservoir and reduce the sediment volume of the reservoir. Pre-reservoir technology is one of the effective ways to prevent and control non-point source pollution in reservoir water source protection areas because of its low cost, many benefits and various adaptation conditions.
4) Restoration of riparian zone: By implementing ecological projects such as artificial wetland, ecological gravel and vegetation restoration in riparian zone, the water in heavily polluted areas with poor hydraulic flow conditions is treated and purified, pollutants and nutrients from non-point sources are adsorbed and transferred, water quality is improved, particulate matter is intercepted and fixed, and particulate matter and sediment in water body are reduced. At the same time, it provides habitat for biological reproduction and growth, and realizes ecological restoration of riparian zone.
5) Water source shelter forest: The construction of water source shelter forest can improve forest structure, increase forest land coverage, improve water conservation capacity, and effectively control and reduce non-point source pollution. Due to the filtration, absorption and shading effects of forests, the types and concentrations of harmful compounds in water can be greatly reduced when precipitation and runoff pass through the filtration and interception of forest canopy, litter layer and soil layer. Moreover, due to the characteristics of low water temperature and high fluidity, the water quality is pure, the dissolved oxygen is rich, and there are few pathogens.
6) Reservoir water body restoration technology: Through controllable artificial stream ecosystem, the conditions such as water flow, light intensity and substrate are adjusted, and the characteristics of rapid growth and reproduction of protoalgae are brought into play, so as to remove redundant nutrients in water body, improve water quality and increase dissolved oxygen. At the same time, combined with aquatic plant restoration and landscape construction projects, using food web theory and biological manipulation technology, the fishery structure is adjusted in the lake area that meets the Class III standard of surface water, focusing on the proliferation of indigenous fish, developing eco-fisheries without environmental pollution, and building fish viewing areas and fishing areas; In the lake area which is worse than the Class III standard of surface water, measures to control algae by fish should be considered, and the fish and algae control area should be mainly built.
7) Isolation project of water source protection area: The isolation project is mainly to set boundary markers and fences at the boundary of the first-class water source protection area, implement semi-closed management, remove seedlings and flower fields, replant fruit forests such as water conservation forests and lychees to grow naturally in advance, and gradually transform them into water conservation forests. The implementation of the isolation project in the first-class water source protection area of the reservoir can effectively prevent outsiders from entering the protection area. Roadside crash barriers and water storage tanks (built in other projects) can effectively reduce the risk of dangerous transport goods flooding into the reservoir and improve the safety of reservoir water quality.
Problems and suggestions of intransitive verbs
(a) problems
1) The contradiction between supply and demand of water resources still exists. According to the forecast, the urban water demand in Shenzhen will reach 26× 108m3 in 2020. At present, the available water supply is 19.27× 108m3, and the water supply gap is 6.7× 108m3. This part of the gap is made up by the development and utilization of non-traditional water resources and the increase of overseas water transfer. However, the development and utilization of non-traditional water resources is a long-term and gradual process, and there is still a certain gap to meet the long-term water use.
2) The utilization of non-traditional water resources is still in the primary stage. From the perspective of water supply sources, the development and utilization of water resources in Shenzhen are mostly limited to traditional water resources. Vigorously developing and utilizing unconventional water resources such as rain, flood, seawater and polluted (medium) water is the requirement of building a resource-saving society and one of the ways to solve the shortage of water resources in Shenzhen. Shenzhen is rich in unconventional water resources and has certain development and utilization potential. However, due to the lack of scientific planning guidelines and other practical difficulties, sewage treatment and reuse, seawater utilization and rainwater utilization are only in the initial stage.
3) Lack of multi-source optimal allocation system. There are many water sources in Shenzhen and the transmission and distribution network is complex. The existing water source allocation is mainly the demand allocation of a single water source project. In the future, with the development of non-traditional water sources and the gradual completion and improvement of water supply network, it is necessary to implement joint dispatching among water sources to ensure that each water source project can give full play to its respective functions and obtain the best economic benefits.
(2) Suggestions
1) to carry out relevant research to solve the long-term water demand gap. Because there is still a certain gap in the long-term water demand in Shenzhen, it is not enough to solve many uncertain factors just by increasing the utilization of non-traditional water resources. In order to ensure the safety of urban water supply, Shenzhen should strengthen water cooperation with neighboring cities, carry out research on increasing overseas water transfer from the perspective of optimal allocation of water resources in river basins and regions, and put forward measures to solve the long-term water demand gap in Shenzhen economically and reasonably.
2) Establish an optimal dispatching system for water supply sources. In order to make full and reasonable use of limited water resources, it is necessary to establish an optimal dispatching system consisting of water intake, transportation and water distribution subsystems to maximize the reliability and economy of water supply for the project.
3) Strengthen the connection of each water supply pipe network. The water supply outside the special zone is mainly street, which is not related to each other, which is not conducive to increasing the complementarity of water supply and improving the safety of water supply. It is suggested to increase the connection of water supply pipe network between groups, so that the water supply between groups and even between communities can be adjusted to improve the water supply guarantee rate of the whole city.
4) Further increase the development and utilization of non-traditional water resources. Due to the lack of local water resources in Shenzhen, it is unsafe to rely on foreign water transfer for a long time, and it does not conform to the overall idea of developing circular economy. In the future, we should focus on strengthening the development and utilization of non-traditional water resources. At the same time, the government should formulate relevant laws and regulations to give certain preferential measures to the development and utilization of non-traditional water resources, so that the development and utilization of non-traditional water resources have economic motivation and policy guarantee.