Water Activities

Carter Holt Harvey - Reusing Water

Carter Holt Harvey have shown how the use of innovative technology in tissue manufacture can reduce the consumption of fresh water while still maintaining productivity.

The company wanted to reduce the amount of fresh water consumed and the amount of wastewater produced on a tissue machine. One machine shower in particular used 60,000 litres of fresh water per hour.

Shutting the shower down was not an option, as it was vital to the efficient operation of the machine and must stay in perfect working order at all times. So Carter Holt Harvey decided to convert the shower from fresh water to clarified water. Clarified water is water that has already been used in a paper machine and undergone a filtering process to remove larger particles.

However, the company needed to ensure that the shower operated correctly using the clarified water - that is, at the correct flow and pressure without any nozzle blockages.

The solution was to install a new shower body on the machine which uses an internal cleaning brush to periodically clean the nozzles and shower pipe. A bleed valve also opens momentarily during the shower pipe cleaning cycle to allow any debris in the pipe to flow into the drain.

Carter Holt Harvey was able to successfully implement this project, resulting in a reduction of fresh water consumption, whilst still maintaining efficient operation of the shower and paper machine.

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