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





Comparison of drying between organic sludge and inorganic sludge after dewatering


Comparison between organic sludge and organic matter


■ Sludge drying




Sludge drying





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