Screening is the preliminary process of the waste-water treatment plants. A screen is a device designed to remove water impurities such as floating solid materials, grit, plastic materials, etc that may hinder the primary treatment process. Based on the size of the impurity to be removed, the screens are classified into three categories: micro, fine, and coarse screening. Based on the type of operation, the screening is classified into manual and mechanical screening. K-Pack is into designing fine and coarse scenes and the types are described below:
MANUAL BAR SCREEN:
As the name suggests, the manual bar screen is the hand-operated screen. The design consists of parallel rods welded together with a spacing of 6 mm [in the case of the fine screen] or 10 mm and above [in the case of the coarse screen]. The dirt collected at the rear of the screen has to be manually cleaned using a rake.
CURVED BASKET SCREEN:
The curved basket screen can be either a manual or mechanically operated screen. The design of the screen will have equally distanced rods that are bent to form a basket structure. The basket will be lowered into the wastewater to collect the floating matter/debris and lifting [which can be manual or mechanical]
CURVED DSM SCREEN:
The curved DSM [Dutch State Mines] Screen is a manually operated sieve screen and is a stationary screen. When the effluent flows perpendicular onto the curved concave surface of the screen, the edge bar screen surface collects floating materials and the clear water free of debris flows out from the bottom nozzle outlet.
MECHANICAL RAKE TYPE BAR SCREEN:
The mechanical rake bar screen is the improved version of the manual bar screen, where the surface of the bar screen is cleaned automatically using a motorized rake mechanism. In K-Pack’s mechanical rake bar screen, a belt conveyor is also provided to collect the scrapped material off the screen. This type of screen can be used as a both fine and coarse screen by maintaining the spacing between the bars.
