The material and design of the tank are commonly determined by the size and location of the industrial wastewater treatment project. Typically, concrete tanks are larger in size due to the high cost to set up. This high cost makes smaller tanks cost prohibitive relative to other designs, which require considerably less equipment on site. Steel tanks for industrial wastewater treatment project are commonly either bolted or welded design. Especially for the factory or plant located in the city, which doesnt allow the storage tank to take too much place. Bolted steel tanks range in size from 5,000 to 3,500,000 gallons compared to welded steel tanks, which can be extremely large. Bolted steel tank also known as Glass-Fused-To-Steel Tank, is made of Glass-Fused-To-Steel, special sealant, self-locking bolt, which provides the best possible combination of the strength and flexibility of steel and the inertness of glass. Glass-Fused-To-Steel also known as glass-lined steel or Enamelled steel, is the result of coating the steel with glass infusion at high temperature (850°C). Comparing with concrete tanks and welded steel tanks, bolted steel tanks have proven to be a cost-effective solution for industrial wastewater treatment project. Bolted steel tanks are prefabricated in the factory and all the materials arrive at the job site ready to install, therefore the amount of manual labor on site is significantly reduced. As extensive and expensive site work required is very minimal, the tank cost is decreased, making bolted steel tanks more affordable compared to other tanks of the same size range. For most mid-sized projects, storage tanks for industrial wastewater treatment project range in capacity from 25,000 to 250,000 gallons, which is well-suited for a bolted steel tank. As welding, grinding and other hot work is not required to erect a bolted steel tank, the risk of fire is dramatically reduced. In addition, bolted steel tanks are prefinished in the factory, therefore sandblasting and painting in the field are eliminated and negative environmental impact is significantly reduced.
