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Leading drain cleaning and wastewater maintenance specialist, Andidrain, has invested in a D:MAX mobile screening and classification unit from CDEnviro.

Leading drain cleaning and waste water maintenance specialist, Andidrain, has invested in a D:MAX mobile screening and classification unit from CDEnviro which has reduced waste to landfill by 70%.

Established over 20 years ago, Andidrain has grown to become one of the most highly respected Drain Cleaning, CCTV and Wastewater Maintenance Specialists operating across the midlands, North of England and Scotland.

During this time they have built a solid reputation in the highways, industrial and commercial markets with clients including water companies, government departments, local authorities, housing associations and contractors to the water industry.

D:MAX is a mobile trailer mounted screening and classification system used to process a variety of materials from the water and waste water treatment process. The mobile nature of the unit minimises the transport cost of waste materials.

This 3rd generation D:MAX unit will be used to process a variety of waste materials from digesters across United Utilities’ wastewater treatment sites separating rag and plastics as well as grit materials from waste, reducing waste to landfill volumes and costs.

“The D:MAX has reduced the mileage and time required to deliver our customer’s requirements. Removing accumulated grit and rag effectively from the wastewater process ensures we remove the problem from site. We are now able to reduce waste to landfill while providing an efficient, high quality service” explains Andrew Little, Partner at Andidrain.

Given the increasing costs of sending material to landfill, any system that can reduce volumes to this extent will have a significant impact on operational costs for operators in the industry. The D:MAX is proven to offer water utility companies and their contractors the most efficient processing system for a range of waste materials and maximises the potential for material recovery.

The raw waste is delivered to the D:MAX and fed directly onto the first high frequency dewatering screen where rag, plastics and any other oversize material are removed. This material is discharged into a skip at the end of the screen. The contents of this skip represent the material that is destined for landfill as it is of no commercial use or value.

The wastewater and grit material passes through the polyurethane screen deck to a collection sump and pumped to the second treatment stage, which involves the waste slurry passing through a specially configured hydrocyclone where fine silts and clays are removed. At the third treatment stage the slurry is discharged from the cyclone onto the second dewatering screen where the grit is dewatered. This material is then discharged into a second skip at the end of the screen which can provide a new revenue stream for D:MAX customers. The dewatered grit material can be sold as recycled aggregates, suitable for a number of applications. Washed grit removed by the D:MAX from digested sludge can be mixed with the dewatered sludge (decanter) cake and sold off for agricultural use.

Prior to the introduction of the D:MAX all the waste material, including a large volume of liquid, was sent to landfill. Following the ban on liquid waste going to landfill in 2007 operators were forced to remove sludge and store it on site on storage / dewatering slabs , this would allow it, to dewater before landfill would accept it. This is a lengthy process requiring the sludge to be handled and transported many times. The D:MAX eliminates this multi handling, removing liquid from waste and returning it to the wastewater treatment process; this has a significant impact on the volume and nature of material going to landfill.

The D:MAX system has enjoyed considerable success in the UK at some of the major utility companies, including Severn Trent Water and United Utilities, and with contractors to the industry. A key advantage is the volume of waste that once went to landfill has been reduced; the waste is now drier and easier to manage; and transport movements are reduced as a result of the recycling and material recovery taking place in situ.

As well as reducing waste to landfill, the grit and silt that is recovered from the wastewater can be resold as recycled aggregates, giving customers a new revenue stream. In addition to this the organics and other screenings can be used in energy generation

Through broad experience gained in the water industry, CDEnviro became aware of the issue of waste streams and the existing practice to dispose of this waste to landfill at substantial cost and environmental impact. The D:MAX was developed to address this issue and to help water utility companies to significantly reduce their waste to landfill volumes while also recovering materials from within these waste streams for further use.

The D:MAX system has the potential to divert tonnes from waste from landfill and recover large volumes of recycled grit and aggregates for further use. With landfill costs continuing to rise the D:MAX system offers water utility companies a route to achieving considerable reductions in costs and increasing operational efficiencies.

CDEnviro waste recovery and recycling systems are used in a variety of industries including waste water treatment, waste processing, construction & demolition, and contract services to the water industry. D:MAX is proven to offer both water utility companies and contractors the most efficient processing system available for a range of waste materials.

To learn more about CDEnviro's grit screening solution for Andidrain, please check out their website.

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