Wastewater Recycling
Could treated wastewater replace freshwater somewhere within your facility?
Unisavour Industries Limited evaluates reuse opportunities from the source wastewater, the existing treatment and the quality each reuse application requires — then engineers the additional stages needed to close the gap.
In short
Wastewater recycling is the further treatment of sewage or industrial effluent so that it can be used again instead of being discharged. The level of treatment depends on the intended reuse: water for landscaping needs a different quality from water for cooling or a manufacturing process. Recycling usually builds on an existing STP or ETP by adding filtration, membrane or disinfection stages suited to the reuse application.
The challenge
Recycling is only worthwhile when the recycled water is fit for a real, steady use. That depends on:
Sewage and industrial effluent differ — and so do the contaminants that must be removed.
What the current STP or ETP already achieves sets the starting point.
Each reuse application has its own water-quality needs and applicable requirements.
Steady on-site demand for non-potable water is what makes recycled water useful.
Engineering approach
The gap between today's treated water and the reuse target defines the engineering.
Review the current treated-water quality and how consistent it is.
Find where, and how much, non-potable water the facility uses.
Compare current quality with what each use requires.
Add the filtration, membrane and disinfection stages that close the gap.
Deliver recycled water to its use, with water-quality monitoring.
Process pathway
Screening and settling remove solids from the incoming wastewater.
A biological process such as MBBR, SBR or MBR removes organic load.
Filtration stages remove remaining suspended solids and colour.
Membrane processes are added where a higher reuse quality is required.
Treated water is disinfected and distributed to its reuse application.
Scope
Where technically appropriate and permitted under the requirements applicable to the project, recycled water may serve:
Each application needs its own defined quality. Recycled water for one use is not automatically suitable for another.
Technologies
A named technology is one part of a treatment train. Which of these suits a particular site is confirmed through water analysis, process design and the required outcome.
Wastewater Treatment
Biological treatment combined with membrane separation for applications that require a highly clarified treated-water stream.
Process family · Biological + membrane
Typical use · Advanced biological treatment, high treated-water quality or recycling
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Wastewater Treatment
Attached-growth biological treatment using carrier media that provide surface area for microorganisms while moving within the reactor.
Process family · Attached growth
Typical use · Sewage and industrial wastewater needing robust treatment and operational flexibility
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Wastewater Treatment
A biological process in which treatment stages occur sequentially within the same reactor through controlled operating cycles.
Process family · Activated sludge / batch
Typical use · Variable flows where batch-cycle operation offers process flexibility
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Industries
Common questions
What buyers ask about wastewater recycling.
Depending on its quality, recycled water may be used for toilet flushing, landscaping, cooling, utility applications or selected industrial processes. Each use requires a defined quality, and the recycling stages are designed to achieve that quality consistently.
The required quality is set by the reuse application and the requirements applicable to the project. Treatment is then designed to remove whatever stands between the current treated water and that target — typically remaining suspended solids, organic matter, dissolved salts or pathogens.
In many cases, yes. Tertiary filtration, membrane polishing and disinfection can often be added downstream of an existing plant — provided that plant produces a consistent treated-water quality. If it does not, the existing plant may need attention first.
Plant audits & upgradesWastewater treatment brings wastewater to a quality suitable for discharge or further treatment. Recycling continues treatment to the quality a specific reuse requires. Treatment is the foundation; recycling adds the stages needed for the next use.
Wastewater treatmentRecycling recovers water for reuse but may still discharge some treated water or reject. Zero liquid discharge aims to eliminate liquid discharge altogether, which usually means concentrating and managing the remaining dissolved solids. ZLD is more involved and is typically considered only where discharge must be minimised or eliminated.
Recycling vs ZLD comparedWastewater Recycling
Share the source of wastewater, the existing treatment, any current treated-water analysis and where you would like to use recycled water.Don't have complete technical data yet? Share what you know — our team can help identify what is needed for the next step.
