Substantiation of a scheme for using metro drainage groundwater for industrial water supply
DOI:
https://doi.org/10.33271/crpnmu/86.201Keywords:
drainage water, metro, groundwater, industrial water supply, dewatering, balance model, water reuse, urban water balanceAbstract
Purpose. To substantiate a technological scheme for the collection, treatment and distribution of metro drainage groundwater for industrial water supply purposes, and to develop a mathematical model linking groundwater inflow into underground structures with consumer demand, which makes it possible to determine the rational composition of the scheme and its technical and economic indicators.
The methods. The study combines an analysis of the regulatory framework for the design of metro systems and industrial water supply systems, a generalisation of international experience in managing drainage water from underground transport structures, and economic and mathematical modelling. A balance model of the system "inflow – water treatment – reservoir – consumer" has been developed, taking into account the seasonal irregularity of inflow and demand, water quality constraints expressed as an admissible blending fraction, and the regulating capacity requirement for the reservoir.
Findings. Using the operating 7.8 km line of the Dnipro Metro as a case study, the calculated inflow amounts to about 540 m3/day (197 thousand m3/year), whereas the metro’s own demand for industrial water covers only 19 % of this volume. A three-stage scheme for the use of drainage water involving municipal and industrial consumers has been substantiated; it provides a utilisation coefficient of 0.85 and replaces about 167 thousand m³ of potable water per year. The required regulating capacity of the reservoir (350 m3) and a payback period range of 1.9–6.0 years depending on the tariff have been determined.
The originality. A relationship has been established between the economic efficiency of implementing a water reuse scheme and the combined tariff for water supply and wastewater disposal accounting for capital investments in water treatment and distribution facilities as well as specific operating costs thereby enabling the determination of conditions for the project's economic viability under various tariff scenarios.
Practical implementation. The proposed scheme allows a municipal metro enterprise simultaneously to reduce the cost of potable water and the charges for discharging drainage water into the municipal sewerage system, to decrease the anthropogenic load on the urban drainage network, and to create a backup source of industrial water for community needs in the event of damage to centralised water supply systems.
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