General information

Chain and Flight
> Wire Rope and Flight
1.2.5. Filtration
Granular media filtration systems to remove fine non-settleable material.
Media systems include silica sand, anthracite, GAC, gravel, garnet all
available in mono, dual, and multimedia form.
Backwash systems are available as manual and automatic control and
comprise air scour, combined air scour/low rate backwash, low rate
backwash and high rate backwash phases as appropriate.
Filter designs available include:
> Conventional open gravity cell
> Pressure filters
> Automatic self backwashing filters
> Filter rate control methods include level controlled, rising level and
declining rate.
Filter media systems are designed to suit the specific application and
include:
> Mono sand media
> Coarse deep bed media
> Dual media (coal/sand)
> Multimedia (coal/sand/garnet)
1.2.6. Membrane Bio Reactors (MBR)
The system utilizes a flat sheet membrane panel arrangement. A series of
these membranes are submerged directly within an activated sludge
treatment tank, greatly simplifying the overall plant layout and provide
directly micro-filtered product water. By this configuration, the energy
required for aeration of the treatment liquor also generates an upward cross
flow over the membranes, keeping fouling of the filtration surface to a
minimum.
The membrane bioreactor treatment produces a high quality disinfected
effluent. The process requires no primary or secondary settlement stages and
no additional tertiary treatment or UV stages to achieve disinfection suitable
for many applications. Raw sewage only requires screening and degritting
prior to entering the membrane bioreactor tank and subsequent discharge.