Flocculation treatment / Sludge drying, Recycling drying

In wastewater treatment, wastewater purification is done by settling particles in wastewater as sediment. However, wastewater cannot be purified unless particles in the water is settled. There is a treatment method called flocculation treatment and it separates particles in wastewater by settling them.

Although particles in wastewater can settle down when their size are large, ones called colloidal particles whose size is around 0.001 to 1 micron keep drifting within wastewater because of random motion called Brownian motion generated by minus charges which normally exist in them.

flocculation treatment sedimentation sludge dryer KENKI DRYER 10/05/2020


■ Coagulation


When inorganic flocculant (inorganic coagulant) which have plus charges is added for the purpose of settling small particles in wastewater down, charges are neutralized and small cluster of particles called floc is generated because of van der Waals force. This is called coagulation. Flocs are still small at this stage. Flocculants which is used here are aluminum sulfate, aluminum salt such as PAC (polyelectrolyte aluminium Chloride), ferric chlorides, poly. ferric sulfate, and so on.


■ Flocculation


By gathering coagulated small clusters and generating larger clusters (flocs), speed of settlement is made faster and separation of water and particle can be done easily and effectively. This process of generating large clusters is called flocculation. In this flocculation process, polymer flocculant is used.

flocculation treatment flocculants sludge dryer KENKI DRYER 10/05/2020



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


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.


Sludge drying



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