Screen is used in order to protect the following units of the plant by holding and removing solid and coarse materials (wood, wood, branches, leaves, paper, glass, plastic etc.) in the wastewater. It may be used as the first unit of the treatment plant or in front of other units according to the intended use. The distance between the screen bars depends on the size of the requested substances. Screens can be classified into three groups as coarse, fine and micro gratings according to the openings between the bars or the pore sizes.
Manual cleaning screen is used in small-capacity wastewater treatment plants where the wastewater intake is not deep and energy supply is difficult. By means of a rake, the impurities attached to the screen are taken manually. The screen is placed at the angle between 55-75 degrees.
Basket screen is an advantageous screen type in terms of investment cost and area saving where the wastewater entrance is deep in small capacity wastewater treatment plants. The basket screen which is connected with the pergel crane is pulled periodically with a manual hook or automatic pull apparatus and the garbage is emptied into the waste container.
A drum screen is produced for the sifting of small solid wastes is a grate used in all process wastes in domestic and industrial wastewater treatment plants. A drum screen separates all solid particles from the wastewater that can pass through the screen. As working principle, drum screen is used in pre-treatment; solid particles, sand, grease, and so on. The waste flows into the discharge area every time the drum is turned. Since drum screens are developed by Duhatech R & D team are closed systems, there are no problems such as odor and wastewater spreading. Other advantages are easy maintenance and low energy consumption.
Static screen is among the physical treatment equipment. This equipment ensures that solid materials in wastewater are graded with gravity without the need for electrical energy. As a working principle, static screen disperses the incoming water to the screen, the water passing through the screen flows down from the center of the equipment, and solid substances flow through the screen to the transfer system. The static screen is developed by the Duhatech R & D team are cost-effective because it is easy to operate, maintain and repair. The screen structure is suitable for continuous use as it is not clogged. Also, there is no noise problem when working. Areas of application: textile, food , paper and alcohol treatment plants of industries, slaughterhouses and recycling wastewater treatment plants.
It is a pre-treatment equipment that cleans the screen bars vertically by scanning the outside in a linear motion. In terms of the linear mechanical screens, it is necessary to use coarse gratings with large screen gaps. Linear mechanical screens are preferred as thin and coarse screens according to the channel geometry. After manufacturing, assembly is carried out by experienced technical staff of Duhatech. It consists of a linear mechanical screen, screen bars, carrier main frame, motor reducer, rake and rake cleaning unit.
Screen Press is used for dewatering and reducing the volume of waste retained in the screens. Generally it is produced as stainless steel. The helix in the screen press drifts the screen waste into the outlet. Models with washing system are available. The amount of organic matter in the waste is reduced by washing. After filtration and washing, the filtrate water is collected in the pan of the grating prese and sent to the screen channel.
Compact screen is a kind of screen which is preferred as a fine screen in treatment plants and allows the removal of solid particles from wastewater. Compact design by Duhatech, the system includes all-in-one units for fine grating, handling, compression and dewatering. Low load loss, high screen efficiency, low operating and maintenance costs and self-cleaning feature is very advantageous to use.