De-inking effluents are usually discharged at relatively higher temperatures and they certainly represent the possibility of low-grade heat recovery. The installation of heat exchangers in the effluent discharge system can recover some of this heat for mill uses such as plant water heating.
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Commercial
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Recovered Pulp
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| Parent Process: Recovered Fiber Pulping | |
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This Energy Guide discusses energy efficiency practices and energy-efficient technologies that can be implemented at the component, process, facility, and organizational levels.
For a mill in the US having effluent streams at 49 °C and flow rate of 2.7 m3/min, the installation of a heat exchanger to recover heat and generate warm filtered shower for the mill's paper machines is estimated to reduce boiler fuel consumption by 39 000 GJ/y.