Using Pumps as Turbines Combined with Pumps for Water Supply in an Efficient Way without the Need of Electrical Power
© DIV Deutscher Industrieverlag GmbH (9/2012)
In cooperation of the Karlsruhe Institute of Technology (KIT) and KSB AG currently innovative concepts for using pumps as turbines for exploitation of drinking water are developed as a part of the German-Indonesian jointproject “Integrated Water Resources Management (IWRM) Indonesia” funded by the Federal Ministry of Education and Research (BMBF). Thus, pumps will be operated inversely to use the hydropower potential as lowcost alternative to conventional turbines. Besides low investment costs, they are characterized by robust designs and low operational and maintenance costs. Additionally, by coupling a pump running as turbine directly to a normal operating pump such an aggregate can deliver water without the need of electrical power at all. This paper discusses theoretically attainable efficiencies of such coupled modules related to different technical designs and different pump and turbine heads, to give a more general overview for very different hydraulic conditions. Main focus is the robustness and simplicity and its implication on attainable efficiency and, especially, if usage of any kind of gearboxes between pump and ‘pump as turbine’ is reasonable.

An exceptional material: State-of-the-art wastewater treatment
© Deutscher Fachverlag (DFV) (6/2010)
Bioworks Verfahrenstechnik GmbH (Germany), a pioneering specialist in biological wastewater treatment, produces floating micro-bubble aeration systems. Their new ‘ ‘Oxiworks’ aerator required the very best in materials to meet market standards. At the same time, the treatment specialists were keen to team up with a supplier capable of offering exceptional technical expertise. In Simona and its Simona PP-H AlphaPlus, Bioworks found both a reliable partner and a best-in-class product solution.

Environmental Aspects of the Mine-inundation of the Recsk Deep Copper Mine, Hungary
© Lehrstuhl für Abfallverwertungstechnik und Abfallwirtschaft der Montanuniversität Leoben (9/2004)
The Recsk Copper mine was planned to operate in some 1,200 m depth from the surface in the Mátra Mountains in Northern Hungary.

Waste water pipelines with a surge vessel plant in the desert of Kuwait
© Vulkan-Verlag GmbH (8/2004)
Kuwait city, located on the Arabian Gulf, with a total population of circa 2.5 million (only of which 0.8 million are Kuwaiti nationals), is considered to be a fast growing city.

Butterfly valves in thermoplastic PE/PP pipelines
© Vulkan-Verlag GmbH (8/2004)
A short face to face dimension is an important fact for the choice of valves used in polyethylene (PE) and polypropylene (PP) piping systems.

Drinking Water Plant South-West Moscow – A challenge for a clean solution
© DIV Deutscher Industrieverlag GmbH (8/2004)
After international, functional invitation for tenders and comparison of the performances offered, the City of Moscow signed on August 7, 2003 the Project Implementation Contract for organising, financing, construction and operation of the Drinking Water Plant South-West Moscow with the German company WTE Wassertechnik GmbH.

Anti-corrosion protection of the AC-exposed “Isar line” against the background of changing times and technology: 1976 – 2004
© Vulkan-Verlag GmbH (7/2004)
Using the example of the "Isar line", the following article provides an approximate summary of the provisions implemented for avoidance of corrosion in buried steel pipes and valves.

Efficiency of Grouting Materials being used as Water well and Borehole Sealing Agents
© DIV Deutscher Industrieverlag GmbH (12/2003)
Bentonite is an essential component of the grouting materials used for sealing the annular space of water and monitoring wells.

Concepts for a decentralized treatment of waste and wastewater
© European Compost Network ECN e.V. (5/2003)
Integrated concepts for the decentralized treatment of waste and wastewater are more and more considered. The reason for this approach is – amongst others - the knowledge that resources are limited and that solutions should address aspects of sustainability.

Pebble-heater twins with fluid dynamic valve - an efficient possibility for high combustion air preheating
© Ostbayerische Technische Hochschule Amberg-Weiden (4/2002)
Pebble-Heaters (PH) with radial fluid flow are very effective regenerators for gas preheating at high temperatures. They can reach a regeneration efficiency of up to 98% and the temperature limit nowadays is around 1,400°C. The investment costs are pretty low, due to the usage of a bulk material (usually alumina pebbles) as the heat storage material. With those characteristics they are very attractive for combustion air preheating in the scope of a regenerative burner system. Their biggest disadvantage is that two units, with corresponding hot gas valves, are required for a continuous operation. For smaller capacities, i.e. less than 10,000 mSTP3/h, those hot gas valves are in fact the most expensive part of the equipment.

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