Wastewater Pretreatment Travelling Grab Screens

Finest screening/filtration holds significant importance in the last stage for cleaning water intakes, for protecting downstream equipment like pumps and condensers reliably against clogging. Dutco Tennant LLC supplies Travelling band screens having the most proven design variant that reduces the life cycle costs and efficiently extracts fine debris. Many of our supplied units have been running successfully at the site for more than four decades in the river and sew water applications. In comparison with the dual flow band screens, our supplied center flow band screens avoid the accumulation of debris under the machines that would be difficult for removing from the bottom of a channel.

Automatically at the upper part, the spraying of the channel takes place and it follows the natural gravity direction which also minimizes the water leakages to the operation deck. Depending on the requirement of the site, the mesh panels are either roof/half-round shaped or are flat. With half-round or roof-shaped mesh panels, higher efficiency of the machine size can be achieved and bigger particles cannot drop back so easily. The maintenance-free sidebar chains are the special features that guide the mesh panels, a highly efficient, scale-like sealing between the screening elements, curved guidance, and chain as well as the chain track on the clean waterside. The adjustable band speed makes way for optimum adaption of screen washing and flow rate. By means of an intense washing, excellent cleaning of the mesh panels is achieved, the wash water system is adjustable and can be controlled via remote control. Traveling grab screens are highly recommended to be used for removing large quantities of debris and are preferred as coarse screens mainly in the high depth channels. They come with a cleaning grab which can move vertically and horizontally when the screens are very much wide or when it is desired for cleaning a large number of parallel screen channels. The cleaning mechanism is completely automatically operated and controlled by time or lever sensors. Manual operation is also available. We supply Travelling Grab Screens which are mainly made up of a supporting steel frame, pillar group supported monorail, grab unit, screen media, positioning sensors, and discharge unit. They are the most economical solutions available under the conditions that channel width is very high or it is required to clean several screen channels.