Drilling is a huge share of any project cost. And much of that is related to dealing with muck in the right way. Alfa Laval’s knowledge and solutions for solids removal and sludge dewatering can minimize those costs, increasing your ability to compete effectively and safely. With less volume to transport you save on disposal time and costs without compromising quality or waste cleanliness. We also have a range of evaporators for cost effective wastewater handling.
Robust compact equipment to help you lead the field in muck cleaning
- Fully customisable, cost effective wastewater treatment
- High volume capacities and compact equipment design
- Contained process resulting in good and safe working conditions
- Improved sustainability benefits – less waste, less transport, less cost
- High level of automation – minimum operator intervention
Innovative technology for civil drilling
Alfa Laval decanter centrifuges are key to achieving high efficiency in drilling and tunneling, especially in terms of treatment of slurries and water cleanliness. The technology efficiently removes most of the fine particles that traditional slurry treatment equipment cannot without recourse to polymers. Due to specific design for construction sites and tunneling environments, the Alfa Laval decanter centrifuges cope with abrasive and coarse particles and can handle large volumes of feed solids and various flow rates.
The decanter centrifuges are available with a range of modules ideally suited for every kind of solids separation job. They range from fully automated operation to simple “hands-on” capabilities. Whichever you choose, you can look forward to effective solutions to your separation needs.
The importance of cleaning waste water at your construction site
The construction and engineering industries play a crucial role in the continued social and economic development of our world. Any serious project (whether public or private) is now subject to requirements to minimize impacts on people and the environment. A contractor’s environmental impact assessments (EIA) and environmental management plans (EMP) set the minimum levels for efficient use of resources, the protection of biodiversity, climate change and, not least the risk of accidents and the protection of our health in general.
An important part of a construction project’s EIA is water management, especially in civil engineering. Water plays a key role whether it is used in excavation and foundations, to cool machines, keep pressure, move solids (for example tunnel boring machines, drilling rigs and cutting machines) or as a means of cleaning. Rainwater and effluent seepage also need to be managed. Companies that can optimize consumption and ensure water meets the national and local regulations regarding cleanliness will always be at an advantage.
Alfa Laval’s range of centrifuge decanters are built to meet the high environmental demands for solid-liquid separation in tunnelling construction and similar applications. The proven separation technology removes the finest particles (unlike sedimentation tanks) making it easier to meet requirements for water disposal or re-use, such as suspended solids, acidity (pH), and biological and chemical oxygen demand. Low operating costs and high separation capacity help contractors to compete effectively and to meet these evermore-stringent environmental demands.
How it works - decanter
The rotating assembly is supported on a compact welded box beam frame with main bearings at both ends. The in-line main motor is flange- or foot mounted onto the unit with adjustable brackets for belt tension adjustment. The bowl is driven at the conical end by an electric motor with a V-belt transmission. The bowl, conveyor, casing, inlet tube, outlets and other parts in contact with the process media are made of AISI 316 or duplex stainless steel with tungsten carbide inserts in the areas most susceptible to wear.
Separation takes place in a horizontal cylindrical bowl equipped with a screw conveyor. The feed enters the bowl through a stationary inlet tube and is accelerated smoothly by an inlet rotor. Centrifugal forces cause sedimentation of the solids on the wall of the bowl. The conveyor rotates in the same direction as the bowl, but at a different speed, thus moving the solids towards the conical end of the bowl. The design enables the decanter to scroll out high loads of solids without blockages caused by high levels of dryness. Only the very driest fraction of the sludge cake leaves the bowl through the solids discharge openings into the casing.
The decanter centrifuge can be adjusted to suit specific requirements by varying the bowl speed, the conveying speed, the pond depth and the feed rate.
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Alfa Laval industrial water and waste treatment solutions helps to reduce your environmental footprint from water and waste streams. We have years of extensive experience in both separation technologies as well as thermal solutions for various waste water treatment applications. An Alfa Laval decanter can be complemented with one of our proven plate evaporators to reach superior water recovery, suitable for reuse. Each system can be adapted to the specific separation duty and capacities. With our robust technologies you maximize reuse of water and minimize energy consumption by turning waste to value.
Stay ahead, save costs and boost sustainability
If you are looking for ways to raise profitability and meet ever more stringent environmental requirements in drilling and tunnelling operations, contact Alfa Laval today to learn more about how our proven, sustainable muck cleaning solutions can save you money and take your business to new levels of excellence.