MBBR Systems (Moving Bed Biofilm Reactors) in Longueuil, Quebec

A moving bed biofilm reactor grows its bacteria as a film on thousands of small plastic carriers that circulate freely in an aerated tank. The carriers are engineered for high protected surface area, so treatment capacity depends on carrier surface rather than on how well sludge settles. Aeration keeps the media moving and supplies oxygen, and a simple screen at the outlet keeps the carriers in the tank. That is the whole mechanism, and its simplicity is exactly what plants like about it.

Three consequences of the moving bed

Three consequences follow. First, there is no sludge recirculation to manage, no return activated sludge pumps, no daily settleability worries; the biofilm regulates itself, which is why an MBBR runs with minimal operator attention. Second, shock loads that would wash out a suspended-growth system mostly bounce off a biofilm, because the biomass is attached and stays put. Third, capacity upgrades are often as simple as raising the carrier fill fraction in the existing tank, which makes MBBR the standard answer for retrofits into existing tankage when production has outgrown an old aeration basin.

Built for Canadian winters

Cold weather is the other reason this technology keeps getting specified in Canada. Biological reaction rates fall as water cools, and winter is where suspended-growth plants struggle, losing slow-settling sludge exactly when they can least afford it. A biofilm process holds its population on the carriers regardless of temperature. We size carrier fill and tank volume against your coldest month, not the annual average, and our cold-climate nitrification designs treat both BOD and ammonia at water temperatures down to a few degrees Celsius. Tanks can be insulated or covered for remote and northern sites where freeze protection is part of the design brief.

Where MBBR fits

Typical applications run from food processing and breweries, where high-strength organic loads need a compact biological stage, to municipal upgrades and remote camps where nobody is standing next to the tank all day. The mbbr search term draws about 260 queries a month in Canada, mostly from engineers comparing it against MBR and conventional activated sludge; the short version of that comparison is that MBBR trades some effluent polish for lower cost, lower energy and far less operational fuss.

What we need to size one

To get a sized proposal, send your flow rate, a lab analysis or a description of the process, and your discharge limits. A process engineer reviews the sizing and returns a configuration, budget price and delivery timeline for anywhere in Canada. Carrier media is stocked for expansions, so raising the fill fraction later is a purchase order rather than a project, and startup seeding support shortens the commissioning curve on cold-weather installations.