Medium pressure belt press for sludge

The medium pressure belt press NPF_ MP type is recommended when it is necessary to obtain a reduction of the water content in sludge. Generally it is installed downstream the sludge treatment lines and consists of a frame in standard section, collect and drain tanks for the iltered water, two joined belts through which the sludge to be dewatered passes, a roller assembly used to drain and compress the sludge, belt puller, belt centring and transmission rollers, a washing system with nozzles for each belt and two sturdy gear motors. The roller assembly comprises one irst drainage roller, one second drainage roller, one low pressure roller, one medium pressure roller, three high pressure rollers, two transmission rollers, two belt pullers, two belt centring rollers and four return rollers. The sludge goes in touch with the belt in the higher part of the belt press, crosses the higher length of the belt along which the water drips by gravity and successively falls on the second belt and goes on flowing into a wedge which facilitates the very delicate removal of the water from the sludge. Subsequently the sludge goes into the irst drainage roller zone which allows a irst slight sludge pressure. The sludge is then submitted to increasingly higher pressures up to zone of higher pressure. Roller with small diameters allow high pressures on sludge. After the sludge evacuation, the two belts are submitted to washing for the residual material elimination. All this occurs with a continuous and completely automatic operation. On request, a ploughshare system, installed on board of the belt press to increase the eficiency of the irst stage of gravity dripping, can be supplied. This is particularly useful for the sludge dificult to be treated. The standard construction is with hot dip galvanized carbon steel frame while the other parts in contact with the water, the tanks, the drainage rollers, low and medium pressure rollers are in stainless steel. Moreover, high pressure, transmission, return, pulling and centring rollers are covered with a rubber layer. On request it is possible the construction with particular protections or completely in stainless steel.