Before
sludge enters the press it is chemically conditioned for dewatering
with an emulsion polymer flocculant that helps form stronger flocs.
After chemical conditioning, a transfer pump drops the sludge onto a
preliminary dewatering belt where free water molecules separate by
gravity and fall into a collection trough. As sludge is conveyed along the belt, ploughs roll it around to help
water drain out. Before dropping down to the next stage, guide plates
position the sludge towards the middle of the belt and ensure nothing is
squeezed out the side of the filter. A second gravity thickener repeats
the process before sludge is fed into a pressing zone. Upon entering the pressing zone, sludge is sandwiched and squeezed
between two belt filters which slowly convey over and under rollers that
force excess water out of the sludge and through the filter mesh. Finally, the pressed sludge is scraped off the belt and collected in a
bin. All filtrate and wash water is captured and transferred back to
the front of the wastewater system for re-processing.our Belt Filter Press Works as following:
Belt
filter presses are great for dewatering applications where sludge is
particulate, oily, or fatty. This covers most food processing and
general manufacturing operations. Some great features of a belt filter
press include: Low energy consumption Compact footprint Multi-stage dewatering Continuous, automated operation Reuse of DAF effluent for wash waterthe reason of Using a Belt Filter Press: