Flotation of a sunken shaft under a pumping station

1977 ◽  
Vol 14 (1) ◽  
pp. 13-17
Author(s):  
G. M. Ulichkin ◽  
V. A. Savoiskii
Keyword(s):  
Pumping Station ◽  
Sunken Shaft

THE STEADY-STATE MODES OF THE COMPLEX ELECTRICAL SUPPLY SYSTEM - PUMPING STATION

2017 ◽  
Vol 25 (101) ◽  
pp. 34-43 ◽  
Author(s):  
Vladyslav, Lysiak ◽  
◽  
Myroslav, Sabat ◽  
Yurii, Shelekh
Keyword(s):  
Steady State ◽  
Supply System ◽  
Pumping Station ◽  
Electrical Supply

Nutrient Removal in Small Wastewater Treatment Plants

1990 ◽  
Vol 22 (3-4) ◽  
pp. 211-216
Author(s):  
Niels Skov Olesen
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Nutrient Removal ◽  
Phosphorus Removal ◽  
Wastewater Treatment Plants ◽  
Ferrous Sulphate ◽  
Practical Solution ◽  
Sensitive Technique ◽  
Pumping Station ◽  
Denitrification Reactor

In some areas of Denmark nutrient removal is required even for very small wastewater plants, that is down to 500 pe (pe = person equivalents). The goal for the removal is 80% removal of nitrogen and 90% removal of phosphorus, or in terms of concentrations: 8 mg nitrogen/l and 1.2 mg phosphorus/l. The inlet concentrations are typically 40 mg N/l and 10 mg P/l. The paper presents the results from two such plants with a capacity of 800 pe. Phosphorus removal is made by simultaneous precipitation with ferrous sulphate. Nitrogen removal is carried out using the recirculation method. Both plants were originally rotor aerated oxidation ditches. They have been extended with a denitrification reactor and a recirculation pumping station. At present both plants have been in activity for about 3 years and with satisfactory results. Average concentrations of nitrogen (summer) and phosphorus is 7 mg/l and 0.9 mg/l respectively. Nitrogen removal seems to be a practical solution on these small plants. It is,though, sensitive to temperature and highly oxidized rain water. Phosphorus removal seems to be an easily run and relatively non-sensitive technique at least when using simultaneous precipitation.

scholarly journals How to Select the Number of Active Pumps during the Operation of a Pumping Station: The Convex Hyperbola Charts

Water ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1474
Author(s):  
Araceli Martin-Candilejo ◽  
Francisco Javier Martin-Carrasco ◽  
David Santillán
Keyword(s):  
Specific Energy ◽  
Analytic Solution ◽  
Iterative Algorithms ◽  
Computational Effort ◽  
Control Technique ◽  
Pumping Station ◽  
Operation Control

This research aims to identify the number of pumps that should be working at any moment during the operation of a pumping station in order to provide the desired volume of water whilst consuming the least amount of energy. This is typically done by complex iterative algorithms that require much computational effort. The pumping station should pump the desired volume of water V* using the least specific energy e* (energy per volume). In the methodology of this article, the shape of the curves e*–V* was analyzed. The result is that such curves present a convex hyperbola shape. This is a straightforward analytic solution that does not require any iterations. The representation of the Convex Hyperbolas Charts will indicate the best pump combination during the operation of a pumping station. Therefore, this is a straightforward resource for practitioners: the curves immediately tell engineers the number of pumps that should be turned on, depending on the desired volume of water to pump. The elaboration of such charts only requires the use of any calculation sheet, only once, and it is a permanent resource that can be used at any time during the operation. In addition, the Convex Hyperbolas Charts are completely compatible and complementary with any other operation control technique.

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