Vacuum dehydrator / Sludge drying, Recycling drying

There are a lot of kinds of dehydrator for sludge arises from wastewater treatment plants. Among them, vacuum dehydrator generates negative pressure inside of drum by using vacuum pump and performs filtering and dehydration by putting sludge on filtering cloth attached on surface of the drum rotating.

■ Vacuum dehydrator

Vacuum dehydrator has rotating drum covered by filtering cloth and negative pressure is generated inside the drum with vacuum pumps. Part of drum is soaked in filtrate of sludge and sludge is drawn toward surface of the filtering cloth when the drum rotates, then the sludge is filtered and dehydrated while it is being stuck on the filtering cloth. Sludge is shaped like cakes and peeled off from the filtering cloth after being dehydrated.
Vacuum dehydrator is the first dehydrator introduced in Japan though, large amount of inorganic flocculant needs to be used and moisture contents of the dehydrated cakes is not decreased so much compared with other types of dehydrator.


vacuum dehydrator wastewater treatment sludge dryer kenki dryer 01/06/2020



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