Evaporation of process water from recycled containerboard mills, TAPPI Journal July 2023

 


Application: This work demonstrates for the first time, in a long-duration pilot plant study, the successful use of evaporation to reclaim water from the process water of a recycle containerboard mill without negative impact on its energy balance. For this purpose, a custom-built low-temperature vacuum evaporator pilot plant was installed on-site at a paper mill to investigate operation, selective separation efficiency, and feasibility under relevant conditions.

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Author: Stefan Bürgmayr, JOanne Tanner, Warren Batchelor, and Andrew A.F. Hoadley
Evaporation of process water from recycled containerboard mi
ABSTRACT: The reduction of the specific effluent discharge volumes of paper mills leads to concentrated process waters that are difficult to treat. Evaporation is an effective water reclamation technology; however, its feasibility largely depends on the fouling behavior of the calcium rich process water. A pilot plant study was conducted to investigate fouling of an evaporator processing the production water from a recycled containerboard mill. The evaporator was operated continuously for five weeks at an evaporation temperature of 55°C and a differential temperature of 5°C, and with a recovery rate of approximately 90%. The calcium ion concentration of the circulating liquor exceeded 7,000 mg/L with a pH of 6. Despite the high fouling potential of the circulating liquor, the heat transfer coefficient did not decline over the investigated trial. The absence of deposits on large areas of the heating surfaces demonstrate that the process water does not generally form deposits under the conditions that were investigated. Calcium sulfate deposits were only found in areas where there was inadequate coverage of liquid over the heating surfaces.The findings show that evaporators can be used to effectively close the water system of recycled containerboard mills without fouling impacting the energy efficiency.
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