General information

1.1.2. Flash Mixing
High intensity mixers rapidly disperse coagulant chemicals efficiently into
the raw water stream.
Both dynamic (e.g. mechanical high speed mixer) and static in-line designs
are applicable.
1.1.3. Flocculation
Low shear rotary or oscillatory mixers are employed to build settle able floc
from the chemically dosed influent
Paddle type mixers (with variable speed option) and hydraulic baffled
channel designs are applicable.
1.1.4. Clarification
Clarifier tanks and mechanisms to remove settle able floc solids or floatable
floc material (dissolved air flotation) depending on the raw water
characteristics.
Many clarifier designs are available to suit rectangular and circular tank
installations, including appropriate sludge scraper and effluent draw-off
mechanisms.
Clarifier designs available include:
> Conventional unhindered settling (circular or rectangular)
> Central flocculation chamber
> Tube settlers
> Static sludge blanket
> Pulse flow sludge blanket
> Solids recirculation
Sludge draw-off methods include:
> Chain and flight scraper
> Travelling bridge scraper
> Hopper bottom (gravity discharge)
1.1.5. Filtration
Granular media filtration systems to remove fine non-settle able material.
Media systems include silica sand, anthracite, GAC for organics adsorption,
gravel, garnet available in mono, dual, and multimedia form.
Backwash systems are available as manual and automatic control and