The quality of the wastewater treatment technology depends on the suitability and quality of the fittings installed, since sedimentation, flow control and treatment of turbid and industrial wastewater place much higher demands on the materials used in the fittings than, for example, the treatment of drinking water. This is mainly due to their viscosity and possible content of solid or abrasive particles.

ABO valve offers a wide range of industrial valves, knife gate valves, check valves and accessories that enable the operation, start-up, control and shut-down of pumps and pumping systems, energy distribution systems - gases, vapours and other media and ensure their safe and regulated operation (manually or automatically). ABO valve fittings are manufactured and offered in various material variants of bodies, blades, discs and sleeves to suit specific operating conditions. According to the medium to be conveyed and regulated, they are fitted with special types of sleeves (seals), which ensures their resistance in controlling the respective cleaning process. The valves can be supplied with different types of controls, which again increases the variability of their use.

Wastewater treatment plant technology

The first part of the wastewater treatment plant is the coarse pre-treatment, which is used to remove coarse impurities from the incoming water. This is where the coarser material is separated on the clarifiers. The heavier particles are deposited in grit and sand traps. Their design slows down the velocity of the wastewater flow and the particles settle out. For this part of the technology ABO valve offers a complete range of knife gate valves Series 200 and 300. The internal design of the gate valve seat prevents sedimentation blocking the gate valve from closing. The surface treatment of the gate valve body with a durable multi-layer coating increases its resistance in corrosive environments.

This is followed by a mechanical cleaning stage that ensures separation of the coarser or finer fractions of suspended solids in the wastewater. This process takes place in settling tanks. The complete range of ABO centric soft-sealing valves of the 900 series is offered for water extraction systems. The disc in CF8M stainless steel, depending on the specific operating conditions, with a Rilsan or Halar coating, i.e. coatings with high corrosion resistance and suitable for installations with chemical residues or for process waters with coarse impurities. The valves are offered with EPDM/NBR sleeves as standard, for applications requiring resistance to mechanical wear we recommend the FLUCAST range of special sleeves.

It is also necessary to reduce the concentration of phosphorus in the effluent prior to discharge (together with nitrogen, they significantly under-promote algae growth in streams). The precipitated phosphate forms flakes that settle in the settling tanks. These are used to sediment the activated sludge from the treated water. The treated water already flows out of them and the relevant pollutant concentrations are maintained. For applications containing aggressive media, ABO offers the VITON / VITON BIO series of cuffs.

They present good chemical resistance and ensure safe flow control. Sludge and gas management are also an integral part of wastewater treatment plants. Sludge is produced by sedimentation in settling tanks and by sedimentation of activated sludge in settling tanks. The stabilisation of the sludge leads to the development of biogas, which is collected in the gas chamber and subsequently used as a source of energy for the wastewater treatment plant. The distribution and transport of biogas is made possible by the 974 series valves with EPI (Epichlorohydrin) cuff.

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