![]() This requires the use of polymer flocculants to clarify the water the geobags are used to contain the silt and sediment as the product Pump the effluent through a geo-textile dewatering bag. The settling basin should be largeĮnough for 3 days of inflow before the water will exit back into the main bodh of water.Īnother method of capturing and dewatering the silt is to It will take 1 to 3ĭays for silt to drop out suspension and if it is small clay particles or colloids it may never drop out of suspension without the aid of a polymer flocculant. It takes only minutes for sand and gravel to drop out of suspension. Pumping to a settling basin is a large containment areaīig enough to allow the water to slow down for the sediment and silt to drop out of suspension. When dredging sanitary waste-water lagoons, waster-water sludge or animal manure slurry it is directly applied toĪgriculture farm land, then the make-up water needs to come from a well, another lagoon or another ready source of silt free water. Sluice or drain line is set up to return the water back to its source. In such cases settling basin is constucted to slow down the water sufficiently to allow the sludge or sand to drop out of solution. This make-up water is often the same water that is used to deliver the sludge or This requires make-up water or return water to the pond, lake or lagoon being dredged. ![]() Due to unproductive back-upsĪnd uneven silt bottoms the dredge tiller head is only engaged into the sludge about 60% of the time.ĭredging needs a minimum of 3 feet of water above the lake, pond or lagoon floor in order for theĭredge to float. Ususal forward speed is 2 to 3 feet per minute. The drege pumps at 2000 gallons per minute. The dredge is driven into sludge as fast as the tiller tines can break up the sludge and theĬentrifugal pump can suck up the loosened silt laden water. This is dependent on how hard packed the silt or sludge is. Multiple passes are often required on the same swath to reach the desired depth.Īpproximately 1 to 2 cubic yards of silt or sludge is It takes approximately 1000 gallons of water to move one cubic yard of sediment Mixed with water and pumped into the fields through the same hose and drag line injection system as with pumping. This dredge is then moved systematically across the lagoon in swaths or lanes eating or cutting through a 24" layer of silt, sludge or sediment per pass. With dredging a barge with a cutter head is put into the lagoon and it traverses the pond or lagoon on a cable that follows a swath or This site can be close or even several miles away. Then a high pressure centrifigal pump increases the pressure and volume of effluent so it can be pumped to a spot to deposit or Through a 8" firehose hose that is floated to closest shore line. Long arm that is lowered to the lagoon or lake floor that loosens the substrate enough for a low pressure high volume centrifigal pump to vacuum up and discharge the water silt, sand sludge mix The process includes a dredging barge with a tiller on a
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