## Ensign Package Sewage Treatment Plant Intensive Biological Processing For Off-Mains Wastewater

> PSTP's should be sized using the latest version of
Package Sewage Treatment Plant's (or PSTP's) are

British Water Flows & Loads which provides
often a suitable option where groundwater in the

detailed information on sewage production figures
surrounding environment is vulnerable, drainage field

and sizing calculations
percolation values are restrictive, or direct discharge

> Regulatory authorities for the control of pollution
to watercourse or surface water sewer is the prefered

in the UK normally require treatment plants
discharge method.

conforming to BSEN12566:3 to be demonstrated
In addition to the anaerobic digestion taking place in the

as capable of producing a minimum effluent
primary settlement tank (as septic tanks) the Ensign unit

discharge quality of 20:30:20 (Biochemical
allows the clarified water to pass into a second 'aeration' chamber where it is treated to remove the dissolved constituents. Here aerobic bacteria, supported by diffused air and mobile media, ensure full treatment is achieved before the treated effluent (and 'sloughed off' bacteria) flow to a final settlement chamber prior to discharge.

## Marsh Industries

Units 3-13 Addington Park Industrial Estate
Little Addington, Kettering, Northamptonshire NN14 4AS
sales@marshindustries.co.uk | +44 (0)1933 654582
www.marshindustries.co.uk

Oxygen Demand;Suspended Solids: Ammoniacal Nitrogen in mg/ltr), although in certain areas more stringent site-specific qualities may be required
> No surface water should enter the system as this
can reduce the system's capacity and cause solids to be flushed out which may prematurely
block drainage field or cause pollution
> As with septic tanks sludge should be removed
annually or in line with manufacturers instructions

## Ensign Benefits

>
Tested to BSEN12566:3 and CE-marked to ensure compliance with latest environmental and Building Regulations requirements
>
Class-leading effluent quality of **11.5:19.2:8.4 (BOD:SS:NH**4) ensures discharges well within national consent standards 
>
Three chamber system correctly sized for separation and retention of solids improves final effluent quality
>
Standard or shallow options enable suitability for all site conditions (including driveways - subject to plinth/surround to prevent superimposed loadings)
>
Shallow option ideal for groundworks involving bedrock or high water table as the low profile allows for safe, cost effective installation
>
Low energy compressors ensure minimal running, maintenance and servicing costs
>
High specification bio-media (310m3 per m2) and membrane diffusers ensure even circulation to eliminate 'dead spots'
>
Internal recirculation (from final to primary chamber) continues treatment process to provide higher effluent quality whilst balancing flow over 24 hour
period or periods of intermittent use
>
Integral lifting eyes for improved on-site handling
>
Unique 'keying-in' lip to assist anchoring into granular or concrete surround
>
Optional extras include patented Polylok filter to further reduce suspended solids and extend life of drainage field; extensions for deep installations;
pumped outlets for sites with adverse levels; and many more

## Ensign Specifications

| View on inlet end   | Typical side elevation   |
|---------------------|--------------------------|
| L                   |                          |
|                     |                          |
| Model               | Length                   |
| 6                   | 2602                     |
| 10                  | 2602                     |
| I                   |                          |
| 12                  | 2860                     |
| 16                  | 2860                     |
| 20                  | 3650                     |
| 25                  | 3650                     |
|                     |                          |
| 30                  | 4550                     |
|                     |                          |
| 35                  | 4550                     |
| 40                  | 5200                     |
| 45                  | 5200                     |
| 50                  | 5200                     |
|                     |                          |

## Ensign Shallow Specifications

Length
Width
View on inlet end
Typical side elevation
Model
Length
Width
Height
Inlet
Outlet
6
2860
1912
1600
500
110
575
110
10
2860
1912
1600
500
110
575
110
12
2860
1912
1600
500
110
575
110
16
3400
1912
1600
500
110
575
110
20
4550
1912
1600
500
160
575
160
25
4550
1912
1600
500
160
575
160
30
5500
1912
1600
500
160
575
160
35
5500
1912
1600
500
160
575
160
|    |    | Invert   | Ø   | Invert   | Ø   |
|----|----|----------|-----|----------|-----|
|    |    |          | T   |          |     |
|     |     |     |
|-----|-----|-----|
View on outlet end
| Invert   | Ø   | Invert   | Ø   |
|----------|-----|----------|-----|