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Low energy advanced wastewater treatment


Modular wastewater solutions for applications ranging from 1,000 GPD (4 m /d) to 100,000 GPD (400 m /d). 



Wastewater Treatment System For Industrial and Land Applictions
Membrane Filtration Module.png

Low energy/ OPEX

Fast reduction of TSS, COD/ BOD and micro pollutant levels

Simple & easy to use

Compact / small footprint

Pictured Above: nrPUR     UF Membrane Filtration Module






The nrPUR    Membrane platform is a low-energy, self-cleaning ultrafiltration (UF) system for the treatment of low- to high-strength wastewater to high-quality discharge or reuse standards. The technology is highly flexible and suitable for both domestic and industrial wastewater, from a wide range of applications that include hotels & resorts, small communities, craft breweries, wineries, dairy and other wastewater. Configured around a series of modular process building blocks, nrPUR     platform offers unparalleled  flexibility and reliability for wastewater treatment on wastewater streams from 300 mg/L to 10,000 mg/L, producing effective TSS & BOD5 reduction of >95%, safe, reuse-quality water. When combined with our advanced polishing technologies the nrPUR     system can treat trace micro pollutants (e.g. Phosphorus, Ammonia, etc) to safe discharge levels.

The nrPUR    UF membrane racks are submerged in the water to be treated and connected to the permeate extraction system. All suspended solids and micro-organisms larger than the membrane pore size, typically less than 0.1 µm in size, will be rejected by the membranes and only clean, solids-free water will be discharged as permeate. The permeate can then be discharged, or sent for reuse or further polishing steps.

On a continuous basis, air is bubbled from a grid of diffusers installed at the base of the nrPUR     racks, acting as a scouring mechanism to reduce the potential for biofouling on the surface of the membrane and to enhance the mixing of the biomass within the membrane tank.

A fully automated system, the nrPUR     platform is designed to provide many years of reliable, effective and affordable treatment of water & wastewater.



The nrPUR   MBR Process 


Wastewater is collected in an Equalization (EQ) tank where non-biodegradable solids are removed and where variations in flow and concentration are moderated. An integrated pH adjustment module monitors the influent wastewater and doses reagents as necessary to reach the desire range for biological treatment. The pre-treated and balanced wastewater is then transferred from the EQ tank to the BioReactor Module, a complete-mix reactor designed to ensure effective biological digestion of the organic materials in the aeration step of the well-proven Activated Sludge (AS) process. Wastewater is recirculated continuously between the BioReactor Module and the Membrane Module.

Membrane BioReactor Process

The Mixed Liquor Suspended Solids (MLSS) concentration, at 10-15 g/L, enhances the ability of the biomass to handle
highly variable and higher strength wastewater influent.

The ultrafiltration (UF) membrane is an absolute barrier to any particulate matter larger than the membrane pore size,
typically <0.1
µm in size. Typically, final effluent quality is suitable for many non potable reuse applications with TSS <<5 mg/L and BOD reduced by 98% or more.

The AS process converts the soluble organic material present in the wastewater into CO2, H2O and biological cell mass, while an aeration system provides the oxygen required for this process. The liquid phase of the mixed liquor (Permeate) is pulled through the membranes at a predetermined rate, or flux, established for each specific application and discharged to a clean water storage tank. The mixed liquor suspended solids (MLSS) are rejected and moved away from the membrane by an air scour and hydraulic action. Surplus biomass generated by the conversion of BOD into cell mass is wasted periodically from the system, on an as-needed basis, as Waste Activated Sludge (WAS), for off-site disposal or for further processing.

nrPUR   Membrane BioReactors (MBR) offers reliable reuse quality effluent


nrPUR Membrane BioReactor

Aerobic BioReactor

Aerobic digestion in a high-strength (10-15 g/L) Mixed Liquor environment

Primary Treatment

Equalization/Settling & Screening to remove solids and substances that can be detrimental to the membranes and digestion process


nrPUR    Membrane Filtration Module


Dead-end membrane filtration of the Mixed Liquor recycle stream

Pictured Above: nrPUR     Membrane BioReactor (MBR) with inground tankage


Typical System Results:

BOD5: < 5 mg/l

TSS: < 5 mg/l

TN: < 5 mg/l

TP: < 0.5 mg/l

Treated water suitable for reuse or discharge

Ultrafiltration (UF) membranes act as a physical barrier to suspended solids and micro-organisms

Ultra Filtration Membranes for MBR

Pictured Above: nrPUR     UF Membrane Rack


nrPUR     Pre & Post Treatment Solutions


In addition to our Submerged UF Membrane solutions for wastewater treatment, Enereau also has wide range of options for both pre- & post-treatment. These solutions include pH adjustment, pre-screening (fine screen, floatation, etc) to final polishing of reuse water with UV disinfection, carbon filtration, etc. Whether deployed as stand-alone units to achieve municipal discharge targets or as a complete treatment platform to achieve onsite reuse our smart modular technologies can help your site achieve its wastewater and water reuse objectives.

Rotary Drum Screen For MBR Wastewater Treatment

Pictured Above: Rotary drum screen to remove fine particles ahead of downstream treatment

pH Adjustment for Craft Breweries and Wineries

Pictured Above: pH adjustment system for a Craft Brewery

Ultra Filtration System for Grey Water

Pictured Above: Pressurized UF membrane skid for the treatment of grey water for onsite reuse

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