The data include the total water supply, wastewater treatment volume and recycled water usage of each municipal administrative region in the Inland Northwest Region in the current year (2016); and the projected values of wastewater discharge volume and recycled water availability in 2035 and 2050.
In 2016, most of the annual sewage treatment volume across the Inland Northwest Region was less than 5 million cubic meters, and Urumqi, the capital of Xinjiang Province, was the largest municipal administrative region in the Northwest Region, reaching more than 10,000,000 cubic meters of sewage, followed by Karamay, Korla, and Changji regions in Xinjiang, as well as Wuwei City, Gansu Province, and parts of Qinghai Province, where sewage treatment volume is is large and can reach more than 10 million cubic meters. Similar to the characteristics of the distribution of sewage treatment volume, the region with large sewage treatment volume has a large amount of recycled water. However, the utilization of Urumqi City, Xinjiang is less than 5 million cubic meters, accounting for only about five percent of the sewage treatment volume, the inland northwest region of reclaimed water usage overall low, southwest Xinjiang, Inner Mongolia area and eastern Qinghai and other areas have not yet reclaimed water reuse.
2035 Xinjiang, Qinghai, Gansu and Inner Mongolia recycled water supply potential of 62885 million m³, 13753 m³, 114.28 million m³, 12.05 million m³; 2050 Xinjiang, Qinghai, Gansu and Inner Mongolia recycled water supply potential of 7656.2 million m³, 196.04 million m³, 182.3 million m³. 15.72 million m³. In 2035, the projected sewage discharge in Xinjiang, Qinghai and Hexi inland area is 645,154,500 m³, 164,508 m³ and 132,154,800 m³, respectively;
In 2050, the projected sewage discharge in Xinjiang, Qinghai, and Hexi inland areas were 77244.95 million m³, 199,912,000 m³, and 200681,000 m³, respectively.
1. 2016 Statistical Yearbook of Urban Construction, Ministry of Housing and Urban-Rural Development.
2. 2016 China Water Resources Bulletin, Ministry of Water Resources.
1. The total water supply, wastewater treatment and reclaimed water utilization in the current status year (2016) of each municipal administrative region in the Inland Northwest Region were obtained using statistical methods;
2. The potential of recycled water utilization in the future level year of each province in the Inland Northwest District was obtained by forecasting based on the System Dynamics of Urban Recycled Water Supply and Demand Model (SDURWM).
2.1.Socio-economic sub-modeling
a. Population growth
The number of people in the city directly affects the amount of water used for residential purposes. A Malthusian model was used to estimate population growth due to the short forecast period.
X=X₀×e^q×t
where X represents the number of population, X₀ represents the initial annual population, t represents the model simulation year, and q represents the natural population growth rate.
b. Industry, economic growth
Its annual growth rate is obtained using a one-way linear regression model, and then substituted into the SD model to simulate the system change.
2.2 Sub-model of tap water supply and demand system
a. Residential domestic water demand
According to the per capita living comprehensive water consumption and water consumption population to get the residents living comprehensive water demand.
b. Industrial water demand
The overall water demand is calculated based on the water demand per unit of value added of output and the growth rate of industrial output.
c. Ecological water demand
The model in this paper uses reclaimed water to recharge the ecological environment
2.3 Sub-model of reclaimed water supply and demand system
In the urban reclaimed water supply and demand system, residential sewage, part of the industrial wastewater and urban miscellaneous tail water can be used as the second source of urban water supply after purification and treatment in urban sewage treatment plants and reclaimed water plants. Most of the reclaimed water reuse from centralized wastewater treatment plant through the pipeline, the utilization is mainly agricultural irrigation, municipal miscellaneous use and urban ecological water. Among them, the secondary effluent with coagulation, sand filtration, disinfection and other processes can be used for industrial, municipal and domestic miscellaneous water use, etc.; the secondary effluent can be used for the production of water in industrial plants after deep treatment. From the perspective of technical cost, the secondary effluent is considered to meet the needs of crop irrigation except for fresh vegetables, but the construction of the secondary effluent pipeline network from the wastewater treatment plant to the farmland has high investment and low return, so agricultural irrigation is not considered in the utilization of urban reclaimed water. The calculation of water demand for each project is obtained by multiplying the area or quantity by the corresponding unit water quota.
(1) The total annual water supply, wastewater treatment volume and reclaimed water usage of the current situation are obtained through the statistical analysis of the relevant data of provinces and districts in Northwest China in 2016, which are obtained from the Ministry of Water Resources and the Ministry of Housing and Urban-Rural Development;
(2) Construct a system dynamics model (SDURWM) based on the change of supply and demand of urban reclaimed water in the inland Northwest region, and propose the index of reclaimed water supply-demand balance (RWB) and the index of utilization efficiency (RWUE) as the indicators of potential evaluation. The potential of reclaimed water utilization is predicted for the future level years in the inland Northwest provinces.
| # | number | name | type |
| 1 | 2017YFC0404300 | National key R & D plan |
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CSTR:11738.11.ncdc.XBSAQ.db2296.2022
10.12072/ncdc.XBSAQ.db2296.2022