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    Advanced sewage treatment plant

    Marsh:Standard sewage treatment plants

    Cost-effective commercial/industrial sewage treatment

    Marsh:Standard cost-effective sewage treatment systems provide biological treatment to off-mains wastewater on large residential, commercial, industrial and leisure sites ranging from 50-300+PE.

    Proven reliability of the simple but effective Submerged Aeration Filtration (SAF-MBBR) system offers both operating and financial benefits when compared to more complex and expensive alternatives that require frequent servicing and maintenance to sustain performance.

    Gaia Sege© Process design software for Marsh:Standard sewage treatment plants

    Developed by Marsh Industries, the unique Gaia Sege process design software uses core information to accurately calculate and tailor key variables ensuring total optimisation for individual applications.

    These precise calculations provide assurance to consultants, engineers, specifiers and contractors that the system is specifically designed to meet the appropriate standards of regulatory bodies.

    For sewage treatment plants, the software uses established core process equations to accurately calculate and tailor key variables ensuring total processing optimisation for Biological Oxygen Demand (BOD), Total Suspended Solids (TSS) and Ammonia (NH4) reduction and removal.

    Gaia Sege software also uses ‘British Water Flows & Loads’ data to calculate initial flows and loadings whilst also calculating peak flows and levels.

    The programme can also calculate accurate sludge generation and storage on a daily basis, dependent upon final effluent standards required, ensuring the optimisation of primary chambers, individual clarifiers, diffused oxygen feed and final settlement chamber.

    Marsh has launched a direct quotation website for the merchant and engineer/specifier; www.bespokesewagetreatmentplant.com. This user-friendly site caters to the design of sewage treatment plants for domestic, commercial and industrial sectors.

    Configuration and components are shown for illustration purposes only

    Operating principle


    1. Inlet
    2. Primary chamber
    3. Aeration chambers
    4. Diffusers
    5. Final (or ‘humus’) chamber
    6. Outlet
    7. Recirculation to primary chamber

    8. Turret guard (optional)

    9. Lockable manhole covers

    10. High level alarm (optional)

    11. Compressors

    12. GRP kiosk


    Plant sizing
    Designed to BS12255, systems are available from 50-300+ PE in sizes ranging from Ø2.5-3m satisfying the demands of virtually all site conditions.

    Class-leading effluent quality
    Designed to British Water loadings (150litres per person, 60mg BOD litre and 8mg/litre Ammonia) ensures effluent discharge is well within national consent standards.

    Cost-effective operation and maintenance
    Systems have no internal moving parts and require minimal ongoing maintenance.

    Heavy duty shell as standard
    Structurally sound and built to last. Enables easy installation in all ground conditions.

    High media surface area
    High specification bio-media (310m3 per m2) and membrane diffusers provide even circulation to eliminate ‘dead spots’.

    Low energy compressor(s)
    Easily accessible low energy compressor for minimal running, maintenance and servicing costs. Integral alarm detects low pressure in air line.

    Internal recirculation
    Continues the treatment process to provide higher effluent quality whilst balancing flow over 24 hour period or periods of intermittent use.

    Lockable manhole covers
    600mm lockable manhole covers provide significant strength and durability, and helps to reduce possible odours.

    Health and Safety considerations
    The Marsh:Standard can be fitted with many safety features including turret guards, failure alarms for compressor components and high level alarms.

    Optional extras
    Optional extras include carbon covers for odour control, turret guards for additional safety, polylok filters to further reduce suspended solids, high level alarms and telemetry for monitoring, and risers/pumped outlets for deeper installations.

    Manufactured in the UK
    All units are manufactured in our twin manufacturing plants at Kettering and Bridgwater. The tanks are constructed using GRP (virgin unfilled resin – no ‘fillers’ such as chalk) providing consistent wall thickness ensuring superior structural strength and durability.


    Marsh:Standard specifications
    Model up to Width Ø
    +/- 50mm
    +/- 50mm
    +/- 50mm
    Inlet invert Inlet Ø Outlet invert Outlet Ø Turrets x 4 Ø Desludge (days)
    50-55PE 2500 4160 2950 600 160 800 160 600 90
    60PE 2500 4470 2950 600 160 800 160 600 90
    70PE 2500 5350 2950 600 160 800 160 600 90
    85PE 2500 6000 2950 600 160 800 160 600 90
    100PE 2500 6950 2950 600 160 800 160 600 90
    125PE 2500 8550 2950 600 160 800 160 600 90
    150PE 2500 10200 2950 600 160 800 160 600 90
    200PE 2500 13400 2950 600 160 800 160 600 90
    250PE 3000 9650 3450 600 160 800 160 600 60
    300PE 3000 9650 3450 600 160 800 160 600 45

    The dimensions given on this page are for guidance only.
    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%.


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