Process Water Treatment
Pulp and paper mills often draw process water from surface water sources the quality of which can vary dramatically over the course of even a few hours. Heavy rains can greatly increase total suspended solids (TSS), turbidity, organic solids and color. During these periods capacity is greatly reduced and process water quality deteriorates rapidly; often resulting in paper quality issues and/or lost production.
CoMag™ is a reliable, low cost solution for the consistent production of clear, particulate free process water for both pulp and paper mills. CoMag will minimize spikes in color, TSS, and turbidity; reduce biological growth; eliminate plugging or fouling; reduce back flush to less than 1% of flow; and help promote stabile plant operations throughput.
Pulp and Paper Mill Influent Treatment
Contaminants |
Raw Water |
Processed Water |
Color |
500 mg/L pt-co |
< 10 mg/L pt-co |
TSS |
> 250 mg/L |
> 2 mg/L |
Turbidity |
< 1000 NTUs |
< 2 NTUs |
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On the left, pulp mill caustic liquor from the "alkaline sewer” of a kraft pulp mill: turbidity feed 660 NTU;
On the right, final effluent 20 NTU. |
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Pulp Mill Wastewater Treatment
Pulp mill operations generate significant quantities of total suspended solids (TSS), BOD, COD and color that must be treated. The treatment of these wastes is often problematic, because the high strength wastes negatively affect the biological treatment processes; often resulting in upsets that can take as long as 2 or 3 days to overcome.
Because CoMag™ is so effective in removing these pollutants, it can be used as a pretreatment process for the high strength wastewaters ahead of a plant’s secondary treatment system. This will greatly reduce the loads to the biological process and thereby improve its productivity. CoMag™ can also be used as a tertiary system to polish a plant’s final effluent for recycle –reuse water or environmentally safe discharge.
Paper Mill: Wastewater Treatment
The treatment of paper mill wastewater is challenging due to very high levels of TSS (fiber, clay, calcium carbonate, uncooked starch and brightening pigments), apparent color and turbidity due to the presence of colloidal pigments. Mills that produce colored papers are further challenged by significant quantities of true color. CoMag™ has demonstrated its capability for removing all these contaminants including true color and apparent color.
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