Use of biochemically purified waste water in a circulating water supply after prepurification

1981 ◽  
Vol 13 (4) ◽  
pp. 274-276
Author(s):  
V. I. Zamelin ◽  
L. I. Gavrikov ◽  
N. F. Ivanova
Keyword(s):  
Waste Water ◽  
Water Supply ◽  
Circulating Water

Effects of the use of drainage-/ infiltration systems in the Pleistocene uplands of the Netherlands

2021 ◽  
Author(s):  
Janine A. de Wit ◽  
Ruud P. Bartholomeus ◽  
Gé A.P.H. van den Eertwegh ◽  
Marjolein H.J. van Huijgevoort
Keyword(s):  
Waste Water ◽  
The Netherlands ◽  
Boundary Conditions ◽  
Water Supply ◽  
Field Experiments ◽  
Crop Yields ◽  
Scale Model ◽  
Groundwater System ◽  
External Water ◽  
The Impact

<p>The Netherlands is a low-lying, flood prone country, located in a delta. Most Dutch agricultural fields are drained to quickly get rid of excess water to increase crop production. Additionally, the freshwater demand of different sectors (agriculture, industry, drinking water) increases, causing an increased pressure on the groundwater system. The combination of fast drainage and increased use of groundwater for human activities led to declining groundwater tables in the Dutch Pleistocene uplands. Given the changing climate resulting in prolonged dry periods, solutions for water retention are needed to decrease the pressure on the groundwater system to guarantee the future water supply for different sectors.</p><p>One of the solutions could be to modify the current drainage systems to drainage-infiltration (DI)-systems with a dual purpose. First, the DI-system stores water during (heavy) rainfall in the soil, but if the risk of flooding increases, the DI-system discharges water. Second, (external) water is actively pumped into the drainage network to raise groundwater tables (subirrigation). Through efficient use of the available external water source (treated waste water, industrial waste water, surface water or groundwater) the pressure on the groundwater system reduces.</p><p>We focus on the data and model results of several field experiments using subirrigation conducted in the Dutch Pleistocene uplands (± 2017-2020). The effects of subirrigation on the groundwater table and soil moisture conditions will be shown, including water supply rate and hydrological boundary conditions. We also provide both the set-up and results of field scale model simulations (SWAP; Soil-Water-Atmosphere-Plant model) to i) quantify the impact of subirrigation on all components of the (regional) water balance (including transpiration, drainage and groundwater recharge), ii) quantify crop yields, and iii) optimize the configuration and management of subirrigation systems for different soil types, hydrological boundary conditions, and climate scenarios.  </p>

scholarly journals Study on creation of water sources supplying the inner river system in Hanoi city with continuous flow for cleaning the aquatic environment

2018 ◽  
Vol 193 ◽  
pp. 02012
Author(s):  
Hue Huu Nguyen ◽  
Thanh Huu Nguyen
Keyword(s):  
Waste Water ◽  
Water Pollution ◽  
Water Supply ◽  
Aquatic Environment ◽  
River System ◽  
Supply System ◽  
Water Supply System ◽  
Current State ◽  
State Of Water ◽  
The One

Vietnam is currently facing major challenges from ongoing water pollution in urban rivers. In the city of Hanoi, the amount of domestic waste water, industrial waste water, and waste water from unprocessed trade villages are discharged directly into the rivers, which are the main causes of water pollution. The biggest problem now is how to deal with the current state of water pollution in the inner rivers of Hanoi with the focus on Day, Nhue, and To Lich river systems. This article presents the study to determine Route Works for a gravity based water supply system that provides continuous flows to these rivers. Then, the one-dimensional hydrodynamic model (HEC-RAS V4.1) is used as a basis for assessing the effectiveness of the solution. Through the results of the study, it was once again confirmed that the construction of a gravity based water supply system is feasible, both to improve the aquatic environment of the rivers and to ensure the supply of irrigation water for production.

scholarly journals METHODS OF SALT CONTENT STABILIZATION IN CIRCULATING WATER SUPPLY SYSTEMS

2017 ◽  
Vol 11 (2) ◽  
pp. 242-246 ◽  
Author(s):  
Volodymyr Shmandiy ◽  
◽  
Lilija Bezdeneznych ◽  
Olena Kharlamova ◽  
Anatoliy Svjatenko ◽  
...  
Keyword(s):  
Water Supply ◽  
Salt Content ◽  
Water Supply Systems ◽  
Circulating Water ◽  
Supply Systems

scholarly journals GROWTH OF AUSTRALIAN CRAYFISH (CHERAX QUADRICARINATUS) JUVENILES IN INDUSTRIAL CONDITIONS DEPENDING ON THE ENVIRONMENT TEMPERATURE

2018 ◽  
pp. 98-103
Author(s):  
Dina Ilyinichna Shokasheva
Keyword(s):  
Water Supply ◽  
Water Temperature ◽  
Maximum Efficiency ◽  
Water Supply Systems ◽  
Cherax Quadricarinatus ◽  
Circulating Water ◽  
Larval Stages ◽  
Study Results ◽  
Environment Temperature ◽  
Fish Tank

The article presents study results of the influence of water temperature on the growth and evolution of juveniles of the Australian red claw crayfish ( Cherax quadricarinatus ) in circulating water supply systems. There have been analyzed 750 specimens of crayfish larvae and 150 juveniles, which were contained in large fish tanks, each with 200 l capacity. Each fish tank had autonomous system water purification and thermal regulation: 24.0; 28.0 and 31.0°С. Duration of test made 63 days. It was found that maximum efficiency of juvenile-stock rearing of crayfish can be achieved under the temperature 25.0-27.0°С. Growth rate of crayfish decreased and their survivalship was lower than threshold values under the temperature 30.0°С and higher. Insignificant changes of the temperature regime of the Australian crayfish juvenile habitat within the bounds of biological normal interval exert a significant impact on the results of their breeding both at an early nascent stage, beginning from the first larval stages, and more recent stages of the ontogenesis. It has been proved that water temperature has effect not only on the weight and linear growth, but also on the survivalship of the Australian crayfish juvenile. It has been observed that under 30.0°С survivalship of young crayfish decreased in two times during the first five days in circulating water supply units. For this reason in providing of industrial rearing of early juveniles of the Australian crayfish it should be taken into account that planned withdrawal at the first two-three months could make up to 50% from the initial number of larvae.

scholarly journals THE RESEARCH OF CIRCULATION WATER SUPPLY SYSTEM OF POWER UNIT OF THERMAL POWER PLANT WITH HELLER COOLING TOWER

2020 ◽  
Vol 2020 (2) ◽  
pp. 1-9
Author(s):  
Mykola Bosak ◽  
◽  
Oleksandr Hvozdetskyi ◽  
Bohdan Pitsyshyn ◽  
Serhii Vdovychuk ◽  
...  
Keyword(s):  
Power Plant ◽  
Water Supply ◽  
Power Unit ◽  
Cooling Tower ◽  
Cooling System ◽  
Thermal Power ◽  
Water Cooling ◽  
Pressure Losses ◽  
Circulating Water ◽  
Water Cooling System

Analytical hydraulic researches of the circulating water cooling system of the power unit of a thermal power plant with Heller cooling tower have been performed. Analytical studies were performed on the basis of experimental data obtained during the start-up tests of the circulating water cooling system of the “Hrazdan-5” power unit with a capacity of 300 MW. Studies of the circulating water cooling system were carried out at an electric power of the power unit of 200 - 299 MW, with a thermal load of 320 - 396 Gcal/hr. By circulating pumps (CP), water mixed with condensate is fed to the cooling tower, from where it is returned through the turbine for spraying by nozzles in the turbine steam condenser. An attempt to increase the water supply to the condenser by increasing the size of the nozzles did not give the expected results. The amount of the water supply to the circulating pumping station depends on the pressure loss in the circulating water cooling system. The highest pressure losses are in hydro turbines (HT), which are part of the circulating pumping station. Therefore, by adjusting the load of the hydro turbine, with a decrease in water pressure losses, you can increase the water supply by circulating pumps to the condenser. Experimental data and theoretical dependences were used to calculate the changed hydraulic characteristics of the circulating water cooling system. As a result of reducing the pressure losses in the section of the hydro turbine from 1.04 to 0.15 kgf/cm2, the dictating point for the pressure of circulating pumping station will be the turbine steam condenser. The thermal power plant cooling tower is designed to service two power units. Activation of the peak cooler sectors of the cooling tower gives a reduction of the cooled water temperature by 2-4 °С only with the spraying system.

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