Marsh Nutra‑Lite Sequential Batch Reactor (SBR)

Marsh Nutra‑Lite Sequential Batch Reactor (SBR) sewage treatment plant, a UK-manufactured system by Marsh Industries designed for small to mid‑sized off‑mains wastewater sites serving up to 50 population equivalent (PE)

🔍 Key Features

Advanced SBR technology: Achieves around an 84% biological reduction of nitrates using purely biological processes—no chemicals or external carbon added 

Exceptional effluent quality (typical performance):

COD: ~33 mg/L (95.8% reduction)

BOD: ~4 mg/L (98.7%)

TNb: ~11.1 mg/L (83.9%)

Ammonia (NH₄⁺): ~0.5 mg/L (99.1%)

Phosphate (P_tot): ~6 mg/L (34.3%)

Suspended Solids: ~11 mg/L (97.1%)

✅ Optional Phosphate Polishing with Phos‑Lite

When paired with the Marsh Phos‑Lite tertiary treatment, the plant can reduce phosphate levels well below 0.28 mg/L, substantially outperforming strict targets from UK regulators such as Natural England and the Environment Agency—all without chemical dosing.

Combined effluent standards in that setup:

BOD: ~1.62 mg/L

SS: ~4.3 mg/L

Ammonia: ~0.38 mg/L

TNb: ~10.5 mg/L

P_tot: ~0.26 mg/

 🧠 Technology & Operational Advantages

Self-cleaning, self-sealing sediment valve for minimal suspended solids and high reliability (no moving parts) 

Remote adjustability and telemetry/alarms, capable of mobile- or Wi‑Fi-based monitoring, plus an economy mode to reduce energy consumption during low load periods.

Built in GRP (glass‑reinforced plastic), meeting EN ISO 11925‑2:2010 fire safety standards. Comes with a 25‑year structural warranty 

Certified to BS EN 12566‑3 Annex B, tested over 50 weeks at Germany’s PIA notified test centre, for treatment plants up to 50 PE

⚙️ Size & Models

Available models cover various population sizes with these approximate specifications:

(Standard inlet/outlet invert: ~550–600 mm; outlet dia ~110–160 mm)

🌍 Environmental & Compliance Benefits

Meets or exceeds UK/EU discharge requirements even for challenging constituents like ammonia and suspended solids.

Offers a non-chemical, sustainable approach, helping landowners, developers, and water companies comply with tightening environmental standards while minimizing long-term operational costs.

Easily retrofit into existing systems or integrated into new builds due to modular design and flexible telemetry capabilities

🧩 Summary

The Marsh Nutra‑Lite SBR is a high-performing, future-ready wastewater treatment solution suitable for domestic and small commercial sites off mains drainage in the UK. It delivers industry-leading effluent quality, advanced nitrate reduction, minimal maintenance, and the flexibility to be enhanced (via Phos‑Lite) for phosphate removal—all certified by rigorous testing.