Module 2: Sewage Treatment Plants STP styles, BioDisc, reed beds, pump stations

Trainer note:

1. Primary Settlement Tank

Wastewater and sewage flows into the primary settlement tank

where the large solids are retained for future removal.

2. First Stage Biological Treatment

The liquor and fine solids then flow into the Biological Treatment

Zone 1 where the first stage of treatment occurs.

3. Second Stage Biological Treatment

The liquor is then fed forward at a controlled rate into Biological

Treatment Zone 2 for further cleaning.

4. Final Settlement Tank

The clean liquid passes into the final settlement tank where it

can be discharged to ground or water course.

Trainer note:

The Klargester BioFicient

1. Primary Chamber

Raw sewage gravitates to the unit where it is received in the primary settlement zone.

Here, gross solids and other social debris settle to the bottom of the tank where they

remain until the tank requires desludging. Settled sewage is displaced from primary

zone and enters the first of two sequential moving aerated media reactors.

2. Biozone 1 & 2

Solids are broken down by air agitated media in the Biozone.

Media and liquid circulation in the Biozone is achieved through

the use of a compressor and diffuser, which introduces fresh air

into each compartment. The liquor is constantly re-circulated and

contacts the moving media and as it does so, it is purified by the

micro organisms growing on the surface of the media and within

the moving liquor. Excess growth of biomass is shed as solid

particles into the liquor.

3. Final Settlement Tank

Where fine solids are settled out. The Final

effluent is discharged via either gravity

outlet or IPS (Integral Pump System)

chamber. With regulatory approval, it is

suitable for discharge to a watercourse or

drainage field.

Trainer note:

1 Primary Settlement Tank

This is the initial stage of treatment and simply involves the

retention of coarse solids present in raw sewage and wastewater for

subsequent gradual breakdown. BioDisc® features one chamber to

ensure efficient operation with a flow balancing facility.

2 First Stage Biological Treatment

The liquor and fine solids then flow into the first stage of

Biological Treatment. A unique managed flow system ensures

peak performance by smoothing variable loads.

3, Second Stage Biological Treatment

The liquor is then fed forward at a

controlled rate into Biological Treatment

stage 2 for further cleaning. This process

ensures the whole media area available is

utilised ensuring maximum efficiency.

4, Final Settlement Tank

The surplus micro-organisms continuously slough off the discs and are carried forward

to the final settlement where they settle out as a humus sludge, leaving a clear

treated effluent to be discharged to ground or water course. The settled humus sludge

is returned to the Primary Settlement Tank by the sludge return pump under timer

control. The sludge return pump also removes any floating scum which helps to keep

the final settlement tank working efficiently.

Trainer note:

Onion style tank

Low profile Bullet style tanks

Trainer note:

Onion style tank strapped down and requires concrete

Low profile tank requires shingle surround

Trainer note:

A reed bed is a

filtration process used

in conjunction with

a Klargester sewage

treatment system to

further enhance the

quality of the effluent

migrating into a drainage

field or surrounding

watercourse..

Trainer note:

pump stations

can be used for effluent

or sewage and are easy

to install.

Used when you can’t get the required fall.