Marsh Gemini ™ Combined SBR and phosphate reduction plant

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

Inlet
Primary chamber
Inflow air-lift pipework
Overflow pipework
Recirculation air-lift pipework
Outflow air-lift pipework
Air diffuser
Sediment reduction valve
Secondary chamber
Setlement chamber
Filter socks
Flow control valve
Submersible pump
Pipework outflow (beneath lower shelf)
Phos-Pellet chamber
Outlet
Heavy duty GRP shell
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.