Catalogue

Plants, equipment and machines for water treatment

GNP

The belt screen with flat teeth can be used for any fine screening treatments when it is necessary a continuous cleaning of the screening screen. It allows the cut down, upstream to municipal treatment plants, of about 10-15% of the polluting load and it can be installed in place of or downstream a coarse screen. The GNP consists of a main frame and a belt with patented, flat and mobile teeth made of plastic material (standard execution in ABS, available also in fiber glass or polyethylene), adequately shaped and hinged on stainless steel shafts. The frame consists of two sturdy metal plate sides, kept positioned by cross-section structural steel; the standard frame is made in carbon steel protected with hot dip galvanization. On request, stainless steel or carbon steel epoxy painted frames can be supplied. A long study and a careful research have allowed to patent a tooth that combines functionality, strength and reliability. The top outline of teeth is such as to prevent the fall of retained material, while the dovetail bottom configuration allows the cleaning of the intermediate spaces on the back stroke. The desired filtration gap is obtained by spacing the moving elements adequately. They are moved by two roller chains which, in their turn, are driven by two geared wheels fitted on the screen top and operated by a sturdy gear motor. In the lower part, the two chains slide around two static guides. In correspondence of the discharge zone, there is a rotating brush driven by a second gear motor for the belt cleaning and helps the screened material to fall into the hopper below. A second stationary brush is placed in the lower part of the screen and works as a seal.
Moreover the particular operation of this equipment allows, during the back stroke of the belt, to wash it with the channel water which runs (with respect to the teeth) in the direction opposite to the filtration flow.
If required, a supplementary washing system, which uses the external service water, can be activated.

Strenghts

• FINE SCREENING.
• PATENTED, STRONG AND RELIABLE MULTIFUNCTION TOOTH.
• BELT CLEANING ALWAYS ENSURED BY 4 CLEANING SYSTEMS IN SEQUENCE:
  ° TOOTH DOVETAIL WHICH REMOVES THE MATERIAL STOPPED AMONG ADJACENT TEETH.
  ° WASHING WITH PROCESS COUNTERCURRENT WATER.
  ° CLEANING REVOLVING BRUSH.
  ° WASHING WITH NOZZLES AND PRESSURIZED SERVICE WATER.
• ABSENCE OF MECHANICAL MOVING PARTS IN WATER.
• STURDINESS.