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СТАНЦИИ, ОБОРУДОВАНИЕ И МЕХАНИЗМЫ ДЛЯ ОБРАБОТКИ ВОДЫ

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Lifting units

In several points of a plant for the treatment of civil or industrial waste water it is necessary to lift more or less considerable quantities of sewage. Moreover the lifting units often absorb most of the total energy required by the plant. It is therefore more and more necessary to maximize the relevant hydraulic efficiency.
SERECO catalogue offers, as lifting units, two models symbolizing the whole category: the Archimedean screw pump (PVA) typical for the lifting of very high flow rates and the air-lift (AL) used for the lifting of fluids full of sands or suspended solids.
The Archimedean screw pump plants (PVA) are generally used at the inlet or at the intermediate stages of the plant, for the lifting of the whole inflow and/or for the sludge recycle and transfer. They shall be preferred to the standard centrifugal pumps due to the very large flow clearance which makes the clogging practically impossible, the high hydraulic efficiency and the particular characteristic of flow self-adjustment according to the water level in the suction well.
The air-lift (AL) pumps are instead used prevalently for the lifting of water and sand or water and sludge mixtures from the sand remover or clarifiers bottom. They have to be preferred to the standard centrifugal pumps for their easy operation, absence of mechanical moving parts in contact with the fluid to be lifted and therefore extreme reliability, flow clearance that practically coincides with the delivery piping cross section.
Both lifting units require a tailored design from time to time in order to maximize the hydraulic efficiency. Just for this reason the dimensions proposed in the data sheets are only indicative and approximate and do not absolutely cover the whole range of the available products.
We wish also to remind you that, on request, SERECO can also design specific lifting plants with centrifugal pumps.

Lifting units

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