MARSH NATURAL SOLUTIONS™ Phosphate reduction without chemical dosing Find out more

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    Advanced sewage treatment plant

    Marsh Gemini ™ Combined SBR and phosphate reduction plant

    Marsh Gemini

    Combining the Marsh Nutra-Lite and Marsh Phos-Lite for compact sewage treatment, phosphate and nitrate removal

    To reduce the footprint of a two-chamber system, Marsh Industries offers the Marsh Gemini, an ‘all-in-one’ solution that combines the Marsh Nutra-Lite SBR and the Marsh Phos-Lite into one single unit.

    The Gemini is available for sites catering up to 16 people.

    Enhanced effluent quality

    The Gemini achieves the following overall effluent quality through its combination of the fully certified and tested Nutra-Lite and Phos-Lite systems:

    BOD: 1.62 mg/l
    TNb: 10.5 mg/l
    NH4n: 0.38mg/l
    Ptot: 0.26 mg/l
    SS: 4.3 mg/l

    The two-chamber approach is fully approved by PIA, with the technical and hydraulic features of the EN12566-3-certified Nutra-Lite and the EN12566-7-certified Phos-Lite remaining the same in this integrated unit.

    Specifications

    Specifications
    Model PE Length Width Height Inlet invert Inlet dia Ø Outlet invert Outlet dia Ø
    Gemini 6 4-6PE 2862 1952 2139 550 110 625 110
    Gemini 10 7-10PE 3652 1952 2283 700 110 770 110
    Gemini 16 11-16PE 5240 1952 2286 770 110 850 110

    Operating principle

    KEY

    1. Inlet
    2. Primary chamber
    3. Inflow air-lift pipework
    4. Overflow pipework
    5. Recirculation air-lift pipework
    6. Outflow air-lift pipework
    7. Air diffuser
    8. Sediment reduction valve
    9. Secondary chamber
    10. Setlement chamber
    11. Filter socks
    12. Flow control valve
    13. Submersible pump
    14. Pipework outflow (beneath lower shelf)
    15. Phos-Pellet chamber
    16. Outlet
    17. Heavy duty GRP shell
    18. Access cover

    Features

    A unique, two-in-one system

    The Marsh Gemini enables a compact installation when both of our market-leading natural solutions, Nutra-Lite and Phos-Lite, are required. It also offers adaptability in tank diameters to suit specific site ground conditions.

    This single unit houses the two certified systems: Nutra-Lite and Phos-Lite. The Nutra-Lite provides advanced Sequential Batch Reactor (SBR) sewage treatment, while the Phos-Lite further enhances effluent quality and supports the achievement of challenging phosphate reduction targets.

    Nutra-Lite significantly reduces biological nitrates through state-of-the-art technology and has been rigorously tested, boasting the mhighest overall discharge quality of any plant available today.

    Treated effluent passes from the Nutra-Lite phase to the Phos-Lite phase for the removal of phosphates without the need for chemical dosing. Using a unique adsorption process, the Phos-Lite phase binds phosphorus to the surface of its media, which is composed of naturally occurring elements. This ensures long-term performance across varying flow rates and influent concentrations.

    Resources

    Marsh Natural Solutions brochure

    PDF

    Phosphate and nitrate reduction in off-mains drainage – technical document

    PDF

    Marsh Nutra-Lite SBR controller brochure

    PDF

    Marsh Nutra-Lite SBR controller installation guide

    PDF

    Marsh Nutra-Lite certificate

    PDF

    Marsh Phos-Lite certificate’

    PDF

    Installation/technical manual

    PDF

    View the Marsh Phos-Lite – The unique phosphate reduction system without chemical dosing

    Technical downloads for architects, engineers, consultants and specifiers including BIM files (RFA and IFC), DWG CAD files