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학술대회자료
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한국펄프·종이공학회 한국펄프종이학회 기타 간행물 Pre-symposium of the 10th ISWPC
발행연도
1999.6
수록면
164 - 171 (8page)

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A new technique for recycling process water was developed in order to reduce the calcium hardness of the closed OCC recycling system. Calcium ions present in the white water were precipitated as calcium carbonate by a reaction with sodium carbonate, and the CaCO₃precipitates were easily removed from the system by a dissolved air flotation(DAF) method. After the OAF stage, CO₂-gas was purged into the water because the pH of Na₂CO₃-treated white water was reduced to neutral by CO₂ gas.
Since CaCO₃ precipitate tends to stick onto the fine fiber surface and then is selectively removed from the water, a proper amount of suspended solid in the process water acts as an important factor in deciding the removal efficiency. By the application of Na₂CO₃ addition - DAF - CO₂ purging to the short circulated white water. the calcium hardness was significantly reduced by 92% and more. The removal of calcium ions with tine fibers led to drainage improvement, reduction of fresh water consumption, and enhanced efficiency of wet-end chemicals.

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ABSTRACT

1.INTRODUCTION

2.CALCIUM HARDNESS CONTROL BY Na₂CO₃ ADDITION-DAF-CO₂PURGING

3.EXPERIMENTAL

4.RESULT AND DISCUSSION

5.CONCLUSIONS

ACKNOWLEDGEMENTS

REFERENCES

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