Optimisation Of The FIiltration Behaviour Through Polymers Using

Optimisation Of The FIiltration Behaviour Through Polymers Using
Date Submitted: 30/08/2022 10:21 AM

Solid-liquid separation is of major importance not only in wastewater treatment but also in many other technical processes. In order to increase the effectiveness of the separation, flocculation aids are used. Very fine particles can thus be quickly converted into large-volume flakes and flake lattices and separated better from the liquid phase. The polymers are high-molecular organic flocculants with different degrees of cross-linking. They have been specially developed for the physical-chemical separation of suspensions. Applications for flocculation aids include processes for sludge dewatering and fermentation residue treatment in sewage treatment plants and biogas plants.


A prerequisite for optimal flocculation of solids is the adsorption of polymers on the particles to be flocculated. Flocculants have the property of dissociating into ions in an aqueous solution, they are also known as Polyelectrolytes. The bonding between chain molecules and suspended particles is based on electrostatic forces and hydrogen bridge formation. The application of the products requires consultation with one of MITSU's technicians for the correct design of storage, production, and solution dosing conditions.

  •  Sludge

  • Mixture of sludge and polymers

  • Sludge before entering the presser shaft system

The decisive factor for the efficient operation of the filter press, the mixing of the sludge is determined by the experience and knowledge of our operators. Usually, the sludge problem has the following cases:

Not flocculation or too small: Due to the solids content in the sludge being too low or the polymer used is not suitable for the sludge properties. The ratio between the sludge and polymer is not suitable or the sludge is dead => The sludge will pass through the rotary drum at the "preliminary dewatering step" => The sludge cannot be pressed.

Flocculation but too many polymers: Polymer will stick on the conveyor belt, blocking the drainage holes during pressing and washing the conveyor belt => Ineffective sludge pressing.






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