DWA designs, manufactures and supplies non-metallic sludge collectors for primary & secondary rectangular sludge settling tanks in sewer and wastewater treatment plants on international market. Non-metal sludge collector is characterized in its anti-corrosiveness and easy installation by the lightweight of materials applied, and most of plants on the world tend to install non-metallic sludge collectors on their sewer, wastewater, and desalination plants. Primary sludge settling tanks collect settled sludge by flights to sludge hopper in the end of settling tanks and remove floated scums by the run of flights on the top of system to scum skimmers. Surplus sludge will be removed in secondary sludge settling tanks