Nereda® aerobic granular sludge technology

Robust and energy-efficient biological wastewater treatment in a compact space.

Discuss your wastewater challengeDiscuss your wastewater challenge

Nereda® is a proven biological wastewater treatment technology based on aerobic granular sludge. It is an extremely cost-effective, efficient, and flexible way to meet even the most challenging effluent quality targets in a limited space.

Unlike conventional activated sludge (CAS), Nereda technology’s robust granules settle rapidly, enabling a fast, effective, single-tank process that doesn’t require support media, clarifiers, or separate anoxic and aerobic reactors.

Nereda can support new-build treatment plants, upgrades to existing activated sludge or sequencing batch reactor assets, and capacity extensions alongside existing processes. The right configuration depends on wastewater characteristics, treatment targets and site conditions.

Why choose Nereda technology

Whether your plant needs to retrofit existing assets to improve effluent quality, expand an existing site with a parallel process, or deploy a sustainable technology at a greenfield site, Nereda technology can help by offering a more efficient process:

pie chart visual of up to 75% less footprint with Nereda

pie chart visual of up to 50% less energy use with Nereda

pie chart visual of more than 90% less chemical use with Nereda

Benefits

Small footprint

Uses 25% less space than CAS

Lowest lifecycle cost

Compact, efficient design reduces CAPEX and OPEX

High effluent quality

Excellent nitrogen and phosphorous removal with minimal chemical use

Flexible installation

Can be installed as a retrofit or greenfield project – and alongside other technologies

Simple operation

Automated operation and a simple, single tank approach

Stable, resilient performance

Rapid recovery when pH, temperature, salinity, or loads change

Challenges solved

Nereda offers a flexible approach to wastewater treatment, supporting plants to overcome their most pressing challenges, including:

Scarce land, resources and capacity headroom – Nereda’s compact settling tanks and energy-efficient process save space and resources while treating a high capacity of wastewater.
Pressure to reduce emissions and chemical and energy consumption – Nereda uses less energy than alternative approaches, with few or no chemical additives, and no plastic media.
Increasingly stringent effluent quality regulations – Nereda’s extraordinary settling qualities can help you achieve high effluent quality in a fraction of the footprint used by other technologies.
A need to reduce operational complexity – Nereda’s simple, single-tank process and master scheduling with the Nereda Controller enable automated operations and easier maintenance.
Ensuring investments are futureproof – Nereda can be deployed as a greenfield solution or retrofit, and alongside other technologies. And customers receive a perpetual licence to use the technology, with no ongoing licence fees.

Planning a new plant, upgrade or capacity extension in your site?

Contact our Nereda specialists!

How Nereda works

Nereda microorganisms grow naturally in compact granules containing aerobic, anoxic and anaerobic biological zones. A repeating three-step cycle of fill and draw, aeration and rapid settling enables several treatment processes to occur in one reactor.

Nereda wastewater treatment cycle showing simultaneous filling and discharge, aeration and fast settling, with aerobic and anoxic/anaerobic zones within the granules.

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FAQ

What is Nereda technology?

Nereda is a biological wastewater treatment technology that uses aerobic granular sludge to remove organic matter, nitrogen and phosphorus in a compact process.

How is Nereda different from conventional activated sludge?

Can Nereda retrofit an existing wastewater treatment plant?

Can Nereda treat industrial wastewater?

Working together with our partners to bring the most value to our clients

We have built an inspiring network of specialised partners throughout the world. Check out how Haskoning delivers Nereda technology directly to the water companies and their contract partners or about our Preferred Supplier program.

Learn more here