Page 37: of Maritime Reporter Magazine (January 2024)

WASTEWATER TREATMENT

Fish don’t eat steak pie and chips. – Iain Milnes,

President, Power Knot

Cunard’s Queen

Anne will have 26 Power

Knot systems installed.

Image courtesy Power Knot Image courtesy Power Knot

Kirsch, Area Manager for Advanced Wastewater Treatment vent its discharge. President Iain Milnes started working with at RWO, says that the CleanSewage Membrane Reactor (CS- Carnival Corporation 10 years ago on the management of its

MBR) system’s submerged ultra? ltration membranes remove food waste stream. Most recently, that relationship has meant solids including bacteria, viruses and microplastics. Addi- that Cunard’s Queen Anne will have 26 Power Knot systems tionally, the system does not involve the use of ? occulants or installed when launched in 2024. chemicals for disinfection. The company’s LFC biodigesters weigh the amount of “This is a feature that is unique to the CS-MBR and contrib- waste that is ingested and report that on the cloud by the hour, utes to its sustainability pro? le as not only does it ensure the day, week, month and year. Larger models can categorize highest ef? uent standards, but the treated water is clean enough waste by type or by source. For example, they can detail how to be re-used in technical water applications,” says Kirsch. This much fruit, meat, or vegetables were ingested and which gal- includes the water used in the CS-MBR itself. The system has ley produced the waste.

been installed on ? ve Celebrity Solstice-class vessels, and has “Fish don’t eat steak pie and chips as part of their natural now been chosen by KiwiRail for two ropax ferries. diet, and what’s not eaten will decompose anaerobically cre-

The issue of discharging plastic into the ocean is not new. ating methane and polluting the sea,” says Milnes. He hopes

Plastic cups and straws can end up in food waste that is al- the IMO will move quickly on preventing the discharge of lowed to be discharged untreated out to sea at most locations. untreated food waste overboard and that MARPOL will be

Power Knot food waste systems can trap that plastic and pre- changed accordingly, sooner rather than later. www.marinelink.com 37

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