Dredging

SUBVAC reservoir maintenance || SUBCAT || Lagoon cleaning || Underwater excavation

SUBVAC® For Reservoir Maintenance

Even the most efficient water treatment facilities cannot filter out 100 per cent of all micro sediments and water treatment media residue. Deposits will accumulate in the reservoir and in time may substantially reduce capacity and water quality.

SUBVAC® is a hydraulic underwater vacuum cleaner capable of removing all sediments, even with accumulations of up to 5 feet deep. No water storage area is too large or too small. SUBVAC® is equally suitable for 1,000 gallon cooling tanks and 5,000,000 gallon reservoirs:

• Potable water reservoirs
• Wet wells
• Large diameter pipelines
• Cooling tanks

SUBVAC® uses environmentally friendly canola base hydraulic oil.

Advantages

• Reduces water treatment costs
• Fast cost-effective removal of sand, silt, alum sludge, filter media residue, etc.
• Restores reservoir capacity, maintains water quality
• Does not require costly, time-consuming reservoir dewatering

SUBCAT

Dominion Divers Ltd.'s SUBCAT is a submersible self-propelled crawler operating on two 32-inch rubber tracks resulting in only .5 PSI ground pressure. This eliminates the danger of breaking the bottom seal of the containment area.

The unit is employed for fast, efficient and cost-effective removal of sludge, sediments, silt and sand.

The current SUBCAT is the culmination of many previous models. It has been designed and developed to work in the environment of the Precambrian shield, both above water and below.

Sewage Lagoons Mine Tailings Paper Mills Lake Reclamation Settling Basins Fly Ash Channel Deepening Harbor Improvements

Sediments are fed into a dredge pump by means of adjustable 8-foot helical augers equipped with cutter blades to break up solids. The slurry can then be pumped up to 2,500 feet away into a pre-designated spoil area. There is no need to shut down or drain lagoons, ponds, or waterways during sediment removal. Sediments and sludge can be removed at the rate of 20 to 75 cubic yards an hour. The rate depends on density of material and the distance to be pumped.

Advantage over other methods:

• Does not require drainage or shutdown of the system
• Hydraulically adjusted cutter head augers, eliminates the danger of disturbing the original bottom seal or contour
• Restores lagoon or pond to original design capacity

We have worked in numerous lagoons that have contained more than just municipal waste. Lime is used in many potable water treatment plants as part of the treatment process. The residue is pumped into the sewage lagoon where it precipitates. This combines with mud and sand that can enter the force main through ruptures and creates a solid mass that can be walked on.

Large lagoon projects completed by Dominion Divers Ltd. include a 10-acre lagoon at Humbolt, Sask. that involved moving 120,000 cubic metres, a 6-acre cell containing 48,000 cubic metres of sludge in The Pas (details available) and the 12-acre primary cell containing more than 100,000 cubic metres at Portage La Prairie.

The SUBCAT unit is totally self-contained and transportable with our truck.

Completed Lagoon Cleaning Projects

Our complete list of clients.

Underwater Excavation

Dominion Divers Ltd's SUBCAT is used in underwater excavation for pipeline installation projects.

Contact us today with your requirements.