WC137 JulyAug 2024 - Magazine - Page 23
said Crisman. “You need a compressed air source at a fairly
low pressure, which is usually on site. We lease our generators,
which means no capital costs and it also keeps us in touch
with customers and learning from their success. We’ve seen
that in chemical savings and improved process performance,
ROI is achieved at a wastewater plant within two months.”
During November 25, 2022, to August 31, 2023, odour
complaints stopped in the winter and spring and were significantly lower during the summer months. Average daily consumption of ferric chloride during the period was 34 L/day, a
reduction of almost 84 per cent compared to the same period
the previous years. They have kept the generator in place.
Odour mitigation
At Stavnsholt WWTP in Denmark, a great number of odour
complaints was a big problem every year. Plant managers had
tried all the odour solutions on the market and only achieved
partial odour reduction with ferric chloride. They considered
completely covering the primary clarifier and treating extracted
odours, but it was costly, so they decided to trial a Moleaer unit
from the company’s partner in Denmark, TECHRAS Nano.
It was installed on the primary clarifier in November 2022.
The generator was fed wastewater from the primary clarifier’s
effluent channel and discharged treated water into the influent
chamber (up to 5,000 kg COD or 11,000 lbs/day). It took
half a day to install and incorporate the generator into the
plant’s process.
2024 and beyond
Pannu says the Moleaer team is very excited to be entering the
Canadian market, and “in the future, we’ll hopefully be able to
share all the details of our first Canadian project.”
In Crisman’s view, what has held back widespread adoption in
the wastewater industry until now is mostly the simple fact that
there’s a tendency for managers to stay with what they know.
But word is spreading. There’s also been a lot of education
in the consulting industry (most U.S. projects going through
consultants) and the Moleaer team feels adoption will now be
full steam ahead. “I think the technology is most appealing
right now to plants with known surfactant issues and those are
at load capacity and are waiting for funding for upgrades,” said
Crisman.“We can improve capacity by about 25 per cent.”
WAT E R C A N A D A . N E T
WATER C AN ADA • JULY/AUGUS T 2024
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