Disc- and drumfilters Dynadisc & Dynadrum series

Superior micro-filtration performance for water, wastewater, water re-use and industrial applications

DynaDisc

With a DynaDisc filter, you get superior filtration performance for water, wastewater, and water re-use applications. The DynaDisc filter combines intelligent design and modern technology to give you clear advantages in filtration applications. The unique design features ensure efficient and reliable filtration day after day, year after year.

Intelligent design – efficient filtration
The DynaDisc filter, consisting of multiple filter discs constructed from modular demountable cassettes attached to a revolving inlet drum, maximises the filtration area in the minimum footprint.

Available in two disc sizes, 1.9m or 2.4m diameter, providing up 197m2 net filter area per DynaDisc with up to 35 discs.
Woven filter media, with filter openings down to 10 microns, is bonded to the one-piece modular cassette ensuring optimum uniform media tension maximising filter media life and minimising the number of sealing joint interfaces.
A proven design providing you with high efficiency filtration and high flow rates within the minimum of space.

Filtration Applications

The versatile DynaDisc design is suitable for a variety of filtration applications such as:

• Wastewater final effluent polishing (tertiary filtration)
• Wastewater primary filtration
• Pre-treatment for MBR processes
• Intake and raw water filtration
• Algae removal
• Recycle and reuse water filtration
• Filtration of water for industrial process plants
• Pre-filtration before the sand filters
• Pre-treatment & protection filtration for membrane plants
• Water treatment in the paper and pulp
• Water treatment in fish farming (aquaculture)

How the DynaDisc works

The water to be filtered flows via the inlet channel into the rotor drum and then flows by gravity into the filter disc segments through openings in the drum, and passes through the filter media. Suspended solids are separated and accumulated on the inside of the filter cloth.

When the water level inside the filter rotor increases to a pre-set point, the filter rotor starts rotating and the backwash of the filter media starts. The high pressure backwash spray removes the accumulated suspended solids into the reject backwash trough inside the filter. The suspended solids are then discharged via the reject pipe. The discs are submerged to approximately 65 % and the water level of the filtrate is maintained by a level tank.

Advantages of the DynaDisc

Patented filter cassette:

• Industry leading fewer parts per disc– the DynaDisc has 8 or 10 cassettes per disc for quick replacement and less weight

• Filter cloth fastened directly to the cassette body – reduces the seal length to a minimum
• Low weight – allows you to install up to 35 x 2.4 m diameter discs in one DynaDisc unit, providing you with up to 197 m2 effective filter area
• Strong cassette body – allows high tension on the filter media, prolonging its service life
• Sizing and loading rates based on effective filter area (actual area) rather than theoretical

The unique level tank:

• Integrated level tank maximises the filtrate outlet weir length optimises headloss across the filter media and reduces surge flow at different influent flowrates
• The filtrate in the level tank is used for the backwash, reduces the risk of biological flocks and blockage from external debris compared to when the backwash water is drawn from a much larger concrete tank
• The waste chemical solution from cleaning the filter media is contained within the level tank, providing a more efficient chemical cleaning procedure

Compact overflow and bypass design:

• Internal and external bypass options
• Space saving modular bypass weir design for maximum flow in the minimum of space

Optimised backwash system

• Protected backwash pump inlet
• Oscillating backwash nozzles minimises water and power use

Two versions – one method

The DynaDisc as available as a freestanding unit with the filter discs contained within a stainless steel tank or as a frame version for installation in concrete basins. No matter which one you choose, you get the same industry leading intelligent design.

Installed worldwide

DynaDiscs are providing users with compact, efficient and reliable filtration across six of the seven continents of the world, speak to the disc filter experts at Nordic Water and see how you can realise the benefits of using the DynaDisc.

DynaDrum

DynaDrum is an automatically self-cleaning micro-screen filter designed for removal of suspended solids. DynaDrum is available in a variety of sizes and designs so you can find one to suit your needs. DynaDrum filters water through the machine by gravity and has a low pressure drop. In addition DynaDrum also has a low energy cost, which together with a proven design provides a low life-cycle cost.

Proven robust construction

The DynaDrum filter comprises several filter panels mounted around a rotating inlet drum and provides a simple yet robust solution for the removal of particles.

DynaDrum is available in five different sizes: 0.6 m, 0.8 m, 1.2 m, 1.6 m and 2.0 m in diameter and provides up to 22.5 m2 net filter surface per machine.

The woven filter fabric, with a density down to 10 microns, sits firmly on the filter panels and is uniformly tensioned to maximise fabric life and minimise the number of attachment points.

A proven and robust design that provides high efficiency filtration with minimum pressure drop.

Main applications

• Food industry
• Waste water
• Primary treatment of waste water
• Fish farming
• Untreated water screening
• Pre-filtering
• Paper and pulp

How DynaDrum works

The water to be filtered enters the drum via the inlet and gravitates out through the filter in the drum outer edges. The particles are separated and stick to the inside of the filter.
When the water level in the drum reaches a preset level, the drum starts to rotate and the filter backflush starts. By means of high-pressure washing DynaDrum uses the filtered water to remove the accumulated particles and deposit them in the pan. DynaDrum operates at a 65% level of immersion and the filtered water is controlled by a weir.

Advantages of DynaDrum

Filter panel:

• Fewer parts per drum segment for easy maintenance and reduced weight
• The fabric is bonded to the filter panels, which maximises densification and allows a high fabric tension, thus extending the operating life cycle
• Low weight allows the installation of up to 22.5 m2 effective filtration per DynaDrum
• The amount and load levels are based on the actual rather than theoretical filter surface

Compact width overflow and bypass:

• Internal and external width opportunities
• Space saving, expandable width overflow

Optimised backwashing:

• Protection against foreign objects in the backwashing system
• Backwashing systems that minimise water and energy consumption

Robust operation:

• Light, lubrication-free and corrosion-resistant chain drive

Two variants – one method

DynaDrum is available as a standalone unit with a chassis in stainless steel or with a framework for installation in a concrete tank. Whichever you choose, you get the same reliable industry-leading rugged design.

Installed worldwide

DynaDrum gives users worldwide compact, efficient and reliable filtration. Contact us at Nordic Water to see how you can make use of DynaDrum’s many advantages.