Effect of using activated sludge and furfural on physical and mechanical properties of old newspaper recycled pulp

Document Type : Complete scientific research article

Authors

1 Corresponding author,Department of Wood Science and Paper Technology, Chalous branch, Islamic Azad University, Chalous, Iran, Email

2 Department of Wood Science and Paper Technology, Chalous branch, Islamic Azad University, Chalous, Iran

Abstract

Background and objectives: One of the major problems in the pulp and paper industry is the presence of activated sludge. The Mazandaran Wood and Paper industries factory about 14 tones of activated sludge daily, which results in high environmental pollution. Therefore, the necessity of using this material in different paper industries is very important.Chemical treatment with furfural is one of the methods for removal of environmental pollution and heavy metals. This study aimed to scrutinize chemical treatment of activated sludge with furfural of 3% and its effect on the physical and mechanical properties of recycled paper pulp.
Materials and methods: Initiallyfor the preparation of test specimens, the activated sludge were mixed and refined with waste newsprint paper pulp at ratios of 0, 10, 15 and 20%.The activated sludge was treated in a beaker for 30 min in 3% furfural and then in a water bath at 100 ° C for 90 min.After that, the treated activated sludge was mixed and refined with waste newsprint paper pulp at ratios of 0, 5, 10, 15 and 20%. And again, the samples with the above ratios were prepared with newsprint paper pulp according to TAPPI standard.Finally, water absorption and their mechanical properties, especially tensile strength, tear, RCT, burst and folding strength were measured.
Results: The results of statistical analysis showed that activated sludge had a significant effect on the mechanical strength and water absorption of specimens. Significant differences in tear strength and water absorption were observed between the treated and untreated samples. The results showed that by increasing the untreated activated sludge in the samples the mechanical properties decreased and the water absorption increased. Chemical treatment with furfural activated sludge showed an increase in the mechanical properties and a decrease in the amount of water absorption. FT-IR spectrum results of the treated samples showed that treatment with furfural to strengthen and activate the functional groups on the surface of activated sludge fibers.Degradable of furfural treated samples was also lower than samples that of untreated activated sludge and samples made of waste newsprint paper pulp so that the treated samples had 26% degradation over 120 days. Samples from waste newsprint paper pulp and untreated sludge samples showed a 83% and 75% weight loss over 120 days, respectively.
Conclusion: According to the results, mixing ratio of 5% of furfural treated sludge was better in terms of strength and water absorption properties. Use of activated sludge at higher ratio for the product made is not recommended due to reduced mechanical strength and increased water absorption.

Keywords

References

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Journal of Wood and Forest Science and Technology
Volume 27, Issue 2
September 2020
Pages 63-78

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