UVT no higher than 0.3%, and the trade waste limit still met. Blood, fats and plant pigments can take processing wastewater below 1% UVT even after DAF, and the Supercritical UV™ disinfection system meets enterococci limits on these liquids with no extra chemicals.
Most of what blocks ultraviolet light in processing wastewater is dissolved: blood, proteins, fats and pigments. Screens and dissolved air flotation take out the solids but leave the colour.
More trade waste limits now cover enterococci too, which are harder to kill than E. coli.
A meat plant, North Island. On the plant's old screen and DAF, UVT never rose above 0.3% over two weeks of sampling. With solids held at consent levels, enterococci fell from 295,589 to 253 per 100 mL, under the 800 limit. The plant then bought six modules, which now run after its new pond and DAF plant, with a median of 40 enterococci per 100 mL across 87 results. Read the full case study
A fruit and vegetable processor. Wastewater below 1% UVT with suspended solids up to 400 mg/L, changing with each crop. Sampled across a full year of crops, enterococci fell by an average of 4.4 log (99.996%). The plant then bought an eight-module system. Read the full case study
A large meat processor, South Island. After multistage dissolved air flotation, the effluent runs at about 12% UVT. A 16-module system has treated the full flow since November 2024, taking E. coli from about 4 million to under 1,000 per 100 mL.
At 1% UVT, ultraviolet light loses 99% of its strength in the first centimetre. In a flow a couple of millimetres deep, about 40% of it still gets through. The lamps sit above the flow, so blood and fat never touch them.
What's the lowest UVT you've treated?
A maximum of 0.3% at a meat plant, and about 0.1% at a food processor.
Will blood and fat foul the lamps?
No. The lamps sit above the flow and never touch it. The channels are cleaned regularly instead.
Do we need extra chemicals first?
No. Keep your screens and DAF for solids. Nothing extra is needed for disinfection.
Tell us about your liquid and your limits, and we'll tell you if a trial makes sense.
Talk to an expertUVT no higher than 0.3%, and the trade waste limit still met. Blood, fats and plant pigments can take processing wastewater below 1% UVT even after DAF, and the Supercritical UV™ disinfection system meets enterococci limits on these liquids with no extra chemicals.
Most of what blocks ultraviolet light in processing wastewater is dissolved: blood, proteins, fats and pigments. Screens and dissolved air flotation take out the solids but leave the colour.
More trade waste limits now cover enterococci too, which are harder to kill than E. coli.
A meat plant, North Island. On the plant's old screen and DAF, UVT never rose above 0.3% over two weeks of sampling. With solids held at consent levels, enterococci fell from 295,589 to 253 per 100 mL, under the 800 limit. The plant then bought six modules, which now run after its new pond and DAF plant, with a median of 40 enterococci per 100 mL across 87 results. Read the full case study
A fruit and vegetable processor. Wastewater below 1% UVT with suspended solids up to 400 mg/L, changing with each crop. Sampled across a full year of crops, enterococci fell by an average of 4.4 log (99.996%). The plant then bought an eight-module system. Read the full case study
A large meat processor, South Island. After multistage dissolved air flotation, the effluent runs at about 12% UVT. A 16-module system has treated the full flow since November 2024, taking E. coli from about 4 million to under 1,000 per 100 mL.
At 1% UVT, ultraviolet light loses 99% of its strength in the first centimetre. In a flow a couple of millimetres deep, about 40% of it still gets through. The lamps sit above the flow, so blood and fat never touch them.
What's the lowest UVT you've treated?
A maximum of 0.3% at a meat plant, and about 0.1% at a food processor.
Will blood and fat foul the lamps?
No. The lamps sit above the flow and never touch it. The channels are cleaned regularly instead.
Do we need extra chemicals first?
No. Keep your screens and DAF for solids. Nothing extra is needed for disinfection.
