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Veolia Actidyn - Wastewater Treatment System

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Sludge is the name given to the wet solids separated out in the primary stage of wastewater treatment. It requires further processing to reduce the volume, and sludge thickening separates the solid and liquid components. Allowing the particles to settle at the base of a vessel is an effective way of carrying out sludge thickening, and Actidyn™ is a compact lamella sludge thickener that can be used at municipal and industrial water and wastewater treatment facilities, in drinking water applications and other chemical sludge that requires thickening before being dewatered. The elimination efficiency of lipids reaches 70-90% depending on the grease quality and concentration. Agira™ has a compact design and is perfectly adapted to degrade high loaded greasy effluents.
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Actidyn reduces sludge volume as it flows through successive stages:

  • Coagulation — raw water is thoroughly mixed with a coagulant, a chemical used to remove suspended solids from the water in the first stage of sludge treatment.
  • Flocculation — a polymer is added to form and develop dense masses of bacteria - also known as flocs -  using a dynamic mixer to produce optimum velocity in the sludge settling unit. 
  • Settling — sludge settles on the floor of the tank or lamella sludge settling unit, and is recovered using a chain or rotary scraper or a sludge hopper before being pumped forward for further treatment. 
  • Clarification — the water is further purified by a counter-current separation process, then flows out towards a system of launders ensuring an equal flow distribution.
  • The sludge bed is homogenized through the slow and regular rotation of a picket fence scraper.

Sludge treatment, disposal and digestion must be handled carefully to avert the risk of contamination of surface waters and groundwater from chemicals and nutrients contained in the sludge. Sludge also contains pathogenic organisms and can be a source of odors.

A high water content makes it uneconomical to transport wet sludge to a landfill site so sludge thickening and sludge dewatering, which take place before disposal or further processing, reduce the volume and therefore associated costs while helping to meet regulatory standards for the disposal and/or facilitating reuse.

The Actidyn lamella sludge treatment system is compact and easy to operate. It can deliver high sludge concentrations, significantly reducing the volume of sludge produced.

It has been installed worldwide, across several sectors including the food and beverage, mining, municipal, oil and gas (downstream) and pulp and paper markets. The system has a solid loading rate of 250 to 1,500 kilograms per square meter per day (kg/m².d)  and has been deployed on flows ranging from 14 to 5,000 cubic meters per hour (m3/h).

Operators can expect a more than 20-year return of experience on installations.

The Actidyn lamella sludge treatment system can be used in a range of applications at clean water and wastewater facilities.