Econet group Ltd.

- Model Chain Scraper System - CSS



DEWA chain scraper system is reliable and user-friendly solution for rectangular settling basins. They can be used in various applications, such as, water and wastewater treatment, API oil-water separation, storm water treatment, and desalination. DEWA chain scrapers can be built one on top of the other in 2 – 3 layers, and are applicable for rectangular basins up to 100m long and 12m wide. DEWA chain scrapers are available in two/three- shaft (bottom or surface) or 4- shaft (bottom and surface) configurations, depending on the clarifier type.

DEWA chain scraper system includes unique tensioning system, that allows chain tensioning without draining tank. This saves time and resources, and makes it the most operator friendly solution. System is tightened above of the water level with a simple screwing system. DEWA tensioning system prevents misalignment faults, which are caused if chain gets loose. Tensioning system can be equipped with automatic tensioner and sensor indicators. These features are convenient when sludge collector is totally under the water, and it is not visible for the operator.

DEWA chain scraper is designed to operate for decades. DEWA systems are made of high quality, non-corrosive components. High-grade plastic and stainless steel components make the system robust and reliable. Safety components, such as overload and flight run indicators, enable safe and comfortable use for operators. 

For floating scum collection, DEWA provides rotating, tubular, skimmer system DEWA Scum pipe. The actuation of the scum pipe can be manual or automatic. DEWA Scum pipes are made of stainless steel.

Thanks to our professional partners who appreciate quality and reliable products, there are over a 2 000 DEWA sludge and scum removal systems in operation throughout the world.

Floating Scum Removal
DEWA has effective “scum pipe” for floating scum removal. Scum pipe can be equipped with manual or electrical turning actuator, which turn the slotted pipe. Rotating degree and technology can be selected according to the water level variation.

Collector Chain Tensioning Assembly
DEWA system includes unique tensioning system, that allows chain tensioning without draining tank. This feature save time and resources, and is most operator friendly solution. System is tightened above of the water level with simple screwing system. DEWA tensioning system prevents misalignment faults which are caused if chain gets loose. Tensioning system can be equipped with automatic tensioner and sensor indicators. These features are very convenient when sludge collector is totally under the water and it is not visible for the operator.

Scraper Flight
DEWA C-channel flights are equipped with wear shoes (carry, return and guiding) and stiffeners. Sufficient number of bottom and side rubber lips are selected according the clarifier type and size. . C-channel flights are available in three different models (C-180, C-220 and C-330) with max. length of 12m.

Collector Chain
DEWA non -metallic collector chain configuration is a combination of chain links, pin, rotating spacer sleeve and locking ring. DEWA chain design has distinctive advantages, as the spacer sleeve rotates over the sprockets (principle as bicycle chain). This design feature prolongs the life span of collector chain and the sprockets. DEWA collector chain is available with three different strength, which is selected according to the clarifier type and size.

Carry and Return Rails
All carry and return rails, wall brackets are made of SS materials. This allows smooth sliding and low friction together with DEWA wear shoe parts.

Shaft Assembly
All shafts (head shafts, idler and stubs), collars, wall brackets are made of SS materials and designed for heavy sludge loadings. Shaft sprockets can be turned around, which double the life span of the sprockets. All bearings are lubrication free and won’t require regular maintenance.

  • Efficient footprint compared to circular basins
  • Low energy consumption
  • Can be built top of each other
  • High removal efficiency
  • Low wearing rate
  • Low maintenance cost
  • Long life span
  • Light weight
  • Durable and non-corrosive components.

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