Circular water economy design recovers 70–90% of process water for reuse — reducing abstraction costs, cutting trade effluent charges, and supporting corporate water neutrality commitments.
Water abstraction or mains supply in the UK costs –³ depending on region and licence. Trade effluent discharge volumes –³ depending on strength and consent. Every cubic metre of water reused avoids both the supply volume and the discharge volume — the dual benefit makes reuse projects technically compelling in most industrial contexts.
Water scarcity is a growing business risk in southern England, Mediterranean regions, and globally. Sites that achieve >70% reuse have dramatically reduced exposure to abstraction licence restrictions, drought orders, and water tariff increases. Water reuse is increasingly required as a condition of planning permission for new industrial developments in water-stressed areas.
Water intensity (m³ per unit of production) is a standard ESG KPI. Reuse rate directly improves water intensity metrics, supporting GRI 303 disclosure, CDP Water Security reporting, and investor ESG scoring. Several food retailers now require water intensity improvement plans from key suppliers as a condition of supply contracts.
Water reuse insulates industrial operations from drought-related supply restrictions and price volatility. Our designs include fail-safe blending and online quality assurance to protect downstream processes.
| Reuse Application | BOD | TSS | E. coli | Treatment Required |
|---|---|---|---|---|
| Cooling tower make-up | <20 mg/L | <10 mg/L | <100 cfu/100 mL | Secondary treatment + UF or MBR |
| CIP pre-rinse water | <10 mg/L | <5 mg/L | Not detected | MBR + UV disinfection |
| Irrigation (restricted) | <25 mg/L | <25 mg/L | <200 cfu/100 mL | Secondary treatment + UV |
| Toilet flushing | <10 mg/L | <5 mg/L | <1 cfu/100 mL | MBR + UV or chlorination |
| Boiler feed pre-treatment | <5 mg/L | <1 mg/L | Not detected | MBR + RO + polishing |
| Process water (food industry) | <5 mg/L | <1 mg/L | Not detected | MBR + RO + UV (site-specific validation) |
Before specifying technology, map all water inputs and outputs: mains supply volumes, process water consumption, cooling water make-up, CIP volumes, boiler feed, and effluent quality by stream. A water balance reveals which streams are suitable for reuse and how much volume can be recovered.
Not all reuse applications require the same quality. Cooling tower make-up can accept secondary-treated water with UF polishing; boiler feed requires RO-quality water. Design the treatment train to the most demanding application, or use multiple treatment grades for multiple reuse streams.
Common treatment trains for industrial water reuse: (a) Biological treatment → MBR → UV: suitable for cooling, irrigation, toilet flushing; (b) DAF → biological → MBR → RO: suitable for food-industry process water reuse; (c) Coagulation → UF → RO: suitable for boiler feed and high-purity process water. See our biological treatment comparison and membrane comparison guides.
Reuse systems for food contact or drinking water applications require validation against WHO guidelines (2006) or EU Regulation 2020/741. Engage the relevant regulator (Environment Agency, Drinking Water Inspectorate) at design stage. A risk management framework (HACCP equivalent for water reuse) is required for food-industry applications.
Our four-pillar approach to sustainable water treatment design and operation.
SustainabilityTechnologies that reduce energy consumption while maintaining compliance.
Energy EfficiencyWater recovery and reuse system design, supply, and commissioning.
Water Reuse SystemsValidate reuse water quality before committing to full-scale reuse system investment.
Pilot TestingOur engineers are available to discuss your specific application, site conditions, and project requirements.
Our expertise spans multiple industries with sector-specific water treatment solutions.