Overview

Overview

The DynaDisc® filter provides a large area for filtration in a compact process vessel. The discs are made up of a number of cassette pieces, joined together around a central drum, with a durable filter cloth bonded to the cassette to provide the filtration. The filter water is then used as the supply of washwater to clean the filter cloth when the headloss through the filter reaches a pre-set level.

Primarily designed for TSS and BOD removal, for which it delivers removals down to 10 mg/l for each, the DynaDisc® can also provide removals of effluent phosphorus down to 1 mg/l in its standard configuration and 0.25 mg/l with the addition of metal salts.  Read about the DynaDisc® filters delivering single-stage phosphorus and TSS removal in Finland.  

Applications

  • Tertiary treatment of wastewater
  • Pulp and paper industry
  • Purification of industrial process water
  • Recirculation of steel industry cooling water

Designed for

Fine particles
Industrial materials
Metals
Nutrients
Benefits

Benefits

  • Can be supplied as freestanding or in situ
  • Can provide removals of effluent phosphorus down to 1 mg/l in its standard configuration and 0.25 mg/l with the addition of metal salts.
  • Fewer parts – theDynaDisc® has 8 or 10 cassettes per disc, which is several times fewer than in disc filters from other manufacturers. This means faster replacement and less weight.
  • Filter cloth fastened directly to the cassette body - keeps the seal length to a minimum.
  • Strong cassette body – allows high tension on the filter cloth, prolonging its service life.
  • Integrated level tank – provides a long level weir for the filtrate which reduces fluctuations at different water flows.
  • The filtrate in the level tank is used for backwash – less risk for biological flocks compared to when the backwash water is taken from a much larger concrete tank.
  • The chemical solution for cleaning the filter cloth is collected in the level tank, thus reducing acid corrosion of the concrete.
How it works

How it works

Water to be filtered is guided into the rotor drum and flows by gravity into the filter discs, through openings in the drum, and passes through the filter cloth. Suspended solids are separated and accumulate on the inside of the filter cloth.

When the water level inside the filter increases to a pre-set point, the filter starts rotating and the backwashing of the filter cloth is initiated. The high pressure backwash spray removes the accumulated suspended solids into the reject flume inside the central drum. The suspended solids are then discharged via the reject pipe.

65% of the disc area is submerged in operation, providing a high area through which the flow can pass.

Technical Information

Technical information

Standard Performance

  • Effluent TSS removal  - Down to 10 mg/l*
  • Effluent BOD removal - Down to 10 mg/l*
  • Effluent Phosphorus removal - Down to 1 mg/l** 
  • Maximum flow rate per filter - up to 588 l/s

 

Upgraded Performance (with addition of metal salts dosing)

  • Effluent TSS removal  - Down to 10 mg/l*
  • Effluent BOD removal - Down to 10 mg/l*
  • Effluent Phosphorus removal - Down to 0.25 mg/l** 
  • Maximum flow rate per filter - up to 294 l/s
Resources

Resources

Case Studies

Case Studies

FAQs

FAQs