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Degree

Master of Science, Miami University, Paper Science and Engineering, 2003.

Abstract

A study employing laboratory-scale repulping was conducted to characterize the relationship between specific repulping parameters and chloroform generation from sodium hypochlorite repulping. The sodium hypochlorite repulping was conducted on highly printed paper towel broke samples. The experiments carried out conformed to a three-factor response surface design. The three repulping parameters studied were pH, temperature, and chemical dosage. Results from the response surface design indicated that high chemical dosage had the greatest impact on repulpability, but it also increased chloroform generation. High pH appeared to facilitate repulping and to lower chloroform generation. It seemed that high temperature was helpful for improved repulpability and reduced chloroform formation in effluent, but it was not a strong variable as the high pH condition. At 1.5% sodium sulfite addition, chloroform was reduced by 20% as compared to the base condition (without sulfite addition). As sodium sulfite addition rate increased, quantities of chloroform decreased accordingly Finally, split (i.e, 2-steps) addition of sodium hypochlorite was compared to single step addition. Surprisingly, much higher levels of total chlorine and chloroform were generated for split addition conditions versus the single addition method.

Subject Headings

Engineering, Chemical

Keywords

Sodium hypochlorite repulping; Optimum repulping conditions; Minimum chloroform generation

Advisor

Robert Christopher Peterson

Pages

103p.

Document number: miami1059075420
Permalink: http://rave.ohiolink.edu/etdc/view?acc_num=miami1059075420

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