Rotary press filter / Sludge drying, Recycling drying

There are a lot of kinds of dehydrator for sludge arises from wastewater treatment plants. Among them, rotary press filter dehydrates sludge with two disc-shaped filtering devices/screens by putting sludge between them and rotating.

■ Rotary press filter 

Rotary press filter puts sludge between two filtering devices/screens and convey it by rotating with low speed. The filtering devices/screens are made by metal discs and lined up vertically toward moving direction by facing each other. Sludge is squeezed and dehydrated while it is conveyed to outlet direction by the rotational force and pressure of injection. Because metal discs which rotate by holding sludge between them are screens for filtering,filtering area is large and sludge cake become thin, therefore, size of the apparatus per amount of feeding materials becomes smaller compared with other dehydrators.
Since screens are made by metal, there is no clogging, amount of flashing water can be small, and operation/maintenance are easy because number of component parts is small.
Also, it is fully sealed and no odor leaks to outside. This rotary press filter is originally developed outside of Japan. Polymer flocculation is use in conditioning before the dehydration.

rotary press filter  wastewater treatment sludge dryer kenki dryer 31/05/2020


dewatering waste water treatment sludge dryer kenki dryer 23/05/2020



About types of sludge dewatering / Sludge drying, Recycling drying


■ Sludge drying


Water in the sludge thickened in the sludge thickener tank are removed at dehydration process to a certain degree.
However, moisture content is normally more than 80% and the sludge still has adhesiveness and stickiness. Also, latter processes are not easy because of influence of flocculants. Our drying apparatus of KENKI DRYER with international patented technology can surely dry any sticky, adhesive and viscus sludge, and also materials in liquid state like slurry, without clogging inside of the dryer. Also, because of its simple structure, its price is low and apparatus cost of the dryer can be retrieved by reducing industrial waste disposal cost within 3 years. Dried materials can be recycled as fuel, bacterial fertilizer, soil conditioner, etc. since component of the material is hardly changed because of its low-temperature drying method.
It can be applied to a system with pyrolysis apparatus as well.

Please refer to the following pages about effect of flocculants during drying process.

About effects of flocculants during drying -1 / Sludge drying, Recycling drying

Comparison of drying between organic sludge and inorganic sludge after dewatering

Comparison between organic sludge and organic matter


Sludge drying

Self-cleaning screw



Please consider KENKI DRYER for drying of sticky materials, adhesive materials and materials in liquid state that no other dryer can deal with.
Initial, running and maintenance costs are low because of its simple structure based on internationally patented technology.
For sludge drying, costs of our dryers are estimated to be retrieved within 2, 3 years by reducing industrial waste disposal cost.
For raw material slurry drying, laborious works of manual operation will be decreased significantly by replacing box shaped compartment tray dryer with our dryer
In case of organic wastes drying, the waste can be recycled as fuel, fertilizer, soil conditioner and feedstuff after being dried.


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Pyrolyzer Biogreen
A pyrolyser with internationally patented technology which use no fire