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Kennewick transforming leftover wastewater into - China Belt Filter Press - Dewatering Screw Press by wang dong
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Kennewick transforming leftover wastewater into - China Belt Filter Press - Dewatering Screw Press by WANG DONG
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| Article Posted: 11/27/2013 |
| Article Views: 97 |
| Articles Written: 1102 - MORE ARTICLES FROM THIS AUTHOR |
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Kennewick transforming leftover wastewater into - China Belt Filter Press - Dewatering Screw Press |
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Business,Business News,Business Opportunities
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The biosolids from the city's wastewater treatment plant are theend result of aerobic digestion and include organic and inorganicmaterials, Griffin said. They have nitrogen, potassium, phosphorusand minerals beneficial to plants. The biosolids recycling process is regulated by the stateDepartment of Ecology, which gave the OK for the city to startafter the biosolids met the required tests, Griffin said. The lagoons have to be emptied every five to six years, Griffinsaid.
Dustin Smith, Merrell Bros. chief business development officer,said the process to dewater biosolids has existed for about 30years, but Merrell Bros. started using it about 10 years ago. It'sbecome more popular because of high transportation costs. Less hauling is involved than if the biosolids still were in liquidform, Griffin said.
Removing 6,000 dry tons of biosolids means pumping about 48 milliongallons of liquid biosolids, Smith said. The biosolids are pumped from the lagoon by a dredge. Attached tothe boat is a rototiller-type head that cuts up the solids andvacuums the liquid up and into a pipe, Smith said. The biosolids flow through a hose and enter a mixing tank, he said.A white liquid called polymer is added, which causes the solids tobind together, allowing clear water to fall through the perviousconveyer belts between which the biosolids are squeezed as theypass around rollers.
Merrell Bros. has nine of the belt filter presses running at once,with the end of each belt pouring the dark-looking fertilizer intoa waiting semi. One full revolution takes between one and two minutes, Smith said.The water is pumped back into the city's lagoon. Clear water fills most of the lagoon, where the company already haspumped. About three more weeks of work remain, he said.
Since the eight-person Merrell Bros. crew started Aug. 1, Smithsaid it has removed about 5,200 dry tons of biosolids. If more than6,000 dry tons are in the lagoon, which is likely, Griffin saidthere is a portion of the contract that allows the city to havemore removed in increments of 500 tons for more money.
The sewer utility rates Kennewick residents pay funded thisproject. Putting the biosolids into a landfill would cost about half of thecontract with Merrell Bros., Griffin said. About 900 to 1,000 truckloads are being taken from the city'swastewater treatment plant to a Benton County farm, Smith said. At the farm, a truck with a side slinger sprays the biosolidsevenly on the field, said Brian Campbell, biosolids coordinator forNatural Selection Farms. The trucks have flotation tires, so theycompact the ground less than regular tires would.
Before the biosolids can be applied, both they and the soil aretested for nutrient content so the correct amount can be applied,he said. Adding the organic matter to the soil helps keep it together, saidTed Durfey, owner of Natural Selection Farms. It increases waterretention and limits wind and water erosion. The amount is calculated to what would work best for the crop, hesaid.
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