Shallow Ensign:Standard™

Shallow Ensign sewage treatment plants

Common sewage treatment plants on the market often exceed 2.3m high. Shallow Ensign sewage treatment plants from 4-35PE are only 1.6m in height, meaning installation is not only possible*, but easier and safer too.

*Shallow Ensign’s are often favoured when hard rock site conditions mean deeper alternatives, involving costly and time-consuming excavation.

Shallow Ensign sewage treatment plants Vs Normal sewage treatment plants

Marsh Ensign

Shallow Ensign sewage treatment plants are widely regarded as one of the most efficient, reliable and economical systems on the market.

The Ensign:Standard is a robust unit with no internal moving parts meaning simple installation and commissioning and minimal long-term maintenance and cleaning.

Class leading performance

CE Approved Tested and approved to BSEN12566-3/A1:2009 all Ensign units provide treatment well within national consent requirements. Published test results of 11.5:19.2:8.4mg/ltr (BOD:suspended solids:ammonia), with influent concentrations on test higher than those chosen by most competitor plants, effectively equates to 97% pollutant removal.

Unrivalled choice

Ranging in size from 4 to 50 PE in Ultra, Standard and Shallow versions of each, and with a wide range of ancillaries, almost all site, consent and budget requirements can be met by units from the range.

Why choose the Marsh Ensign?

End users, merchants and installers alike recommend the Ensign range due to its ease of installation, reliability, and cost-effective operation and maintenance. All backed by technical support from local contacts.

Operating principle

In addition to anaerobic digestion taking place in the primary settlement chamber [2] the Ensign unit allows the clarified water to pass into a second ‘aeration’ chamber [3] where it is treated to remove the dissolved constituents. Here aerobic bacteria, supported by diffused air and mobile media, ensures full treatment is achieved before the treated effluent and ‘sloughed off’ bacteria flows to a final settlement chamber [10]. The final effluent is then discharged to the drainage field or watercourse via a Polylok filter.

KEY

Inlet
Primary settlement chamber
Aeration chamber
Compressor with alarm
Compressor housing (External or internal options)
RCD / Electrical connection
PVC pressure pipe for diffuser(s)
Bio-media
Stainless steel mesh

10. Final settlement chamber

11. Sludge return

12. Unique Polylok tertiary filter (Only on Ensign:Ultra units)

13. Outlet

14. Access lid

15. Integral lifting eyes

16. Stabilising feet

17. Unique ‘keying-in’ lip

Benefits

Inlet with ‘Forsheda seal’
Forsheda seal provides flexibility in the joint for easier installation.Optional risers to increase invert depth are available.
Primary settlement chamber
Aeration chamber
Advanced compressor with alarm (Ensign:Ultra units only)
Near silent compressor ensures minimal running, maintenance and servicing costs. Integral alarm detects low pressure in air line. (Regular Low-energy compressor on Ensign:Standard models).
Compressor housing – internal or external options available
The compressor can be housed internally or externally with no difference in cost.External recommended to increase compressor life, and supplied as standard on 4PE, shallow and pumped outlet versions.
RCD/Electrical connection (Ensign:Ultra units only)
The RCD box provides easier installation and proveds a higher degree of safety. (Regular plug/socket connection on Ensign:Standard models).
PVC pressure pipe/diffuser(s)
Provides a protective conduit for the air diffuser line. Can be easily removed for maintenance and cleaning.
Bio-media
High specification bio-media (310m3 per m2) and membrane diffusers ensure even circulation to eliminate ‘dead spots’. The bio-media is contained by a stainless steel securing mesh to ensure no migration during handling or potential flooding.

9. Stainless steel mesh

Retains media in aeration chamber during transportation and handling, and in the event of flooding.

10. Final settlement chamber

11. 32mm sludge return

Larger diameter sludge return prevents the possibility of blockages and improves system circulation. Provides higher effluent quality whilst balancing flow over a 24 hour period or periods of intermittent use.

12. Unique Polylok tertiary filter (Ensign:Ultra units only)

The Polylok tertiary filter reduces suspended solids and BOD by a further 40% helping to extend drainage field life.

13. Outlet with ‘Forsheda seal’

Forsheda seal provides flexibility in the joint for easier installation. Optional pumped outlets are available.

14. Impermeable lid

Heavy duty lid/frame improves strength and durability whilst blending into the surrounding environment. (Regular lid on Ensign:Standard models).

15. Integral lifting eyes

For safe and secure on-site handling.

16. Stabilising feet

Stabilising feet prevents the tank from rolling and allows safe and steady transportation and installation.

17. Unique ‘keying-in’ lip

Assists anchoring into granular or concrete surrounds.

Specifications

Specifications table
Model (pop)	Length	Width +/-50mm	Height +/-50mm	Inlet invert +/-50mm	Inlet dia	Outlet invert	Outlet dia
6	2860	1912	1610	500	110	575	110
8	2860	1912	1610	500	110	575	110
10	2860	1912	1610	500	110	575	110
12	2860	1912	1610	500	110	575	110
16	3400	1912	1610	500	110	575	110
20	4200	1912	1610	500	160	575	160
25	4200	1912	1610	500	160	575	160
30	5200	1912	1610	500	160	575	160
35	5200	1912	1610	500	160	575	160

Larger population sewage treatment plants may be supplied as multiple tank configurations.
For precise tank sizes and configurations, please contact Marsh Industries.
All dimensions in mm.
Due to production processes, dimensions of finished units are within a tolerance of +/-2.5%.