Designed to deliver outstanding ammonia reduction within a shallow, compact footprint, the Ensign-EL sewage treatment plant sets a new benchmark for performance in constrained and environmentally sensitive sites.

Accredited to EN12566-3 Annex B for systems up to 50 Population Equivalent (PE), the Ensign-EL achieves ammonia concentrations as low as 1 mg/l through a robust multi-stage process incorporating primary settlement, advanced aerobic biological treatment with specialised biofilm media, and simultaneous nitrification and denitrification.

At just 1.6m in height, its shallow-dig design simplifies installation in challenging ground conditions and high water tables.

How does it work?

The Ensign-EL shallow sewage treatment plant employs a multi-stage process. It initiates with primary settlement, allowing solid particles to settle out. Subsequently, aerobic biological treatment occurs in two biozones filled with specialised biofilm support media. This unique media ensures highly efficient nitrification, reducing ammonia concentrations to a mere 1 mg/l in the final effluent. 

Additionally, simultaneous nitrification and denitrification processes reduce nitrate levels.

This system holds accreditation to EN12566-3 Annex B for systems of up to 50 Population Equivalent (PE) and complies with the UK Forward for BSEN12566-3.

The natural solution for advanced sewage treatment and nitrate removal

Marsh Industries proudly presents the Marsh Nutra-Lite, an advanced Sequential Batch Reactor (SBR) sewage treatment plant designed to enhance effluent quality for off-mains wastewater systems and significantly reduce biological nitrates.

The Nutra-Lite is available in capacities catering to sites for up to 50 people. With state-of-the-art technology and rigorously tested, the Nutra-Lite sets a new standard for sustainable domestic sewage treatment.

The Marsh Nutra-Lite can be supplied as a complete system, combined with the Marsh Phos-Lite for intensive phosphate removal. See Marsh Phos-Lite for details.

SBR technology provides superior effluent discharge

The Nutra-Lite sewage treatment plant harnesses SBR technology, achieving an impressive 84% biological reduction in nitrates. Unlike traditional methods, no chemicals or carbon are used – just biological processes.

The Nutra-Lite boasts the highest overall discharge quality of any plant available today. Additionally, a unique self-cleaning, self-sealing sediment reduction valve ensures total control over suspended solids. No mechanical parts provide reliability and efficiency.

Nutra-Lite not only excels in phosphate and nitrate removal but also significantly reduces other key effluent constituents:

COD: 95.8% – 33mg/l
BOD: 98.7% – 4 mg/l
TNb: 83.9% – 11.1mg/l
NH₄n: 99.1% – 0.5mg/l
Ptot: 34.3% – 6mg/l
SS: 97.1% – 11mg/l

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.

Phosphate reduction without chemical dosing

Marsh Phos-Lite is a groundbreaking product designed to efficiently remove phosphate from wastewater.

Utilising a unique adsorption process, Phos-Lite 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.

Recommended for up to 35PE (population equivalent), Phos-Lite is fully scalable to meet larger demands.

Achieves phosphate levels of 0.2mg/l

The plant is engineered for maximum retention time, guaranteeing stable, low effluent phosphorus concentrations certified by PIA GmbH at 0.2mg/l.

Economic and efficient

With an electrical consumption of just 0.03 kWh/d, Phos-Lite operates at very low cost.

System flexibility

This innovative tertiary treatment solution seamlessly connects to the outlet of both new and existing treatment plants.

Enhanced effluent quality

Phos-Lite not only excels in phosphate removal but also significantly reduces other key effluent constituents.

The Marsh Nutra-Lite treats effluent to the following standards:

BOD: 4mg/ltr
Suspended Solids: 11mg/ltr
Ammonia: 0.5mg/ltr

When the Marsh Nutra-Lite and Marsh Phos-Lite are combined, the effluent quality is further improved to:

BOD: 1.62mg/ltr
Suspended Solids: 4.3mg/ltr
Ammonia: 0.38mg/ltr
PTot: 0.26mg/ltr
TNb: 10.5mg/ltr

Test results achieved when the Marsh Ensign:EL and Marsh Phos-Lite are combined is as follows:

COD | 56.1% | 23 mg/ltr
BOD | 59.5% | 4 mg/ltr
TNb | 5.5% | 26.5 mg/ltr
NH4n | 24% | 0.4 mg/ltr
Ptot | 95.9% | 0.2 mg/ltr
SS | 61.1% | 4 mg/ltr

Eco-sensitive phosphate, ammonia and nitrate reduction for nutrient neutral sites

Designed to reduce Phosphate, Ammonia and Nitrates in environmentally sensitive areas, the Marsh Aqua-Puratine system surpasses standards required by Natural England and environmental regulators.

Supplied as a complete system, combining the EL and G-APS units, the Marsh Aqua-Puratine is available in capacities catering to sites for up to 50 people. The Aqua-Puratine-G-APS (Intelligent Controlled Dosing System) can be integrated with any sewage treatment plant to enhance effluent discharge quality.

Enabling nutrient neutral development in environmentally sensitive areas

Combined effluent standards of TNb 18mg/l, Ptot 0.9mg/l

Extremely low or undetectable chemical residuals in discharge
(below 0.0139% of total 24hr processing of the effluent)

How does it work?

Marsh’s innovative nutrient removal technology combines the Aqua-Puratine:EL and Aqua-Puratine-G-APS systems, revolutionising wastewater treatment. This integrated approach effectively reduces pollutants and nutrients, ensuring compliance with stringent environmental standards.

The Aqua-Puratine:EL sewage treatment plant employs a multi-stage process. It initiates with primary settlement, allowing solid particles to settle out. Subsequently, aerobic biological treatment occurs in two biozones filled with specialised biofilm support media. This unique media ensures highly efficient nitrification, reducing ammonia concentrations to a mere 1 mg/l in the final effluent. Additionally, simultaneous nitrification and denitrification processes reduce nitrate levels. This system holds accreditation to EN12566-3 Annex B for systems of up to 50 Population Equivalent (PE) and complies with the UK Forward for BSEN12566-3, demonstrating its reliability and effectiveness.

Complementing this, the Aqua-Puratine-G-APS introduces controlled chemical dosing for phosphate removal in off-mains sewage treatment plants. It’s designed to match chemical infusion precisely with influent phosphate loads, preventing wasteful overdosing. The Aqua-Puratine-G-APS features two chambers for efficient phosphorus removal and biosolids settling.

The key to the system’s performance lies in its control and automation. Marsh Controls and Marsh Alarms utilise high-quality aeration and dosing timers, ensuring accurate chemical dosing. Monitoring the pumped outlet from the preceding sewage treatment plant guarantees chemicals are dosed appropriately. In instances of gravity discharge, an intermediate pump chamber ensures precise dosing, even when homeowners are absent.

This innovative approach stands out from continuous dosing systems, which can lead to increased metal concentrations in effluent. The Aqua-Puratine-G-APS adapts dosing based on inflow, ensuring safety for children, wildlife, and the environment. Moreover, it’s energy-efficient, consuming only 1 kWh per day.

In summary, Marsh’s nutrient removal technology offers an environmentally friendly solution for wastewater treatment, reducing pollutants and nutrients effectively while adhering to strict regulatory standards.