VLR® System for Biological Treatment
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Secondary aeration treatment for biological nutrient removal (BNR) with a smaller footprint and utilising less energy
- Lower construction costs
- Less land area required
- Operating flexibility
- Low power costs
- Easy to meet peak oxygen demands
- Process adaptability
- Peak flows five times the design flow
VLR® Systems provide simultaneous nitrification / denitrification in a smaller footprint. The systems utilize looped reactors in series that allows DO stratification. The tanks are similar to oxidation ditches that have been flipped on their sides. There is an upper and lower compartment, separated by a horizontal baffle. The process was adapted from Orbal® Multichannel Oxidation Ditch technology and uses the same surface mounted discs to provide mixing and deliver oxygen. Power costs of the VLR system process are 20 to 30% lower than other conventional BNR processes. Typically, two or more basins make up the system, with the first tank operating as an aerated anoxic reactor.
- Common wall construction
- Small footprint
- Dual aerator design, two sources of oxygen delivery (disc aeration and coarse bubble aeration)
- Lengthy aeration retention time
- Coarse bubble air diffusers add flexibility
- DO stratification
- Handles excessive storm water treatment Direct Drive ensures 7 percent more energy efficiency than first-generation drive
- Bearings minimize downtime with fast replacements, remote grease lines with direct greasing and optional automatic greasing, plus eliminate overtightening with optical sensor