Valorisation of Paper industry waste for oil spill treatment

Cherukumalli, Nitya Ragaleena (2023) Valorisation of Paper industry waste for oil spill treatment. Masters thesis, Indian Institute of Science Education and Research, Kolkata.

Text (MS dissertation of Nitya Ragaleena Cherukumalli (18MS120)) Thesis_18MS120.pdf - Submitted Version Restricted to Repository staff only Download (4MB)

Abstract

Cellulose fibre, the most prevalent natural biopolymer on the planet, may provide a highly efficient, low-cost, and chemical-free wastewater treatment solution. Cellulose is found in a wide variety of plants and marine organisms. It is a carbohydrate polymer composed of 1,4-linked anhydrous-D-glucose units with three hydroxyl groups. Because of its low cost, renewability, biodegradability, and non-toxicity, cellulose-based products have been employed in food, industrial, pharmaceutical, paper, textile manufacturing, and wastewater treatment applications. Cellulose-based materials can be used as adsorbents, flocculants, and oil/water separation membranes for water treatment in the oil and gas industry. In this project, the solid sludge from the Pulp and Paper industry was modified for oil sorption. The modification increased the hydrophobicity by coating stearic acid and oleic acid. Engine oils and castor oils were used for oil sorption studies. The four types of oils are castor oil, 10W-30, 20W-40 SF/CF, and 20W-40 SL. Stearic acid showed better sorption than oleic acid. Stearic acid forms more stable, ordered structures when it interacts with other substances, such as the surfaces of solids or the interface between two immiscible liquids. In contrast, oleic acid is more fluid and flexible and tends to form more disordered structures when interacting with other substances. In this study, out of all the oils considered, 20W-40SL had the highest viscosity, showing the most sorption in both Stearic acid-coated and Oleic acid-coated sludge sorption studies. When sorption studies were conducted with stearic acid-coated sludge for oils 10W-30, Castor oil, 20W-40 SF/CF, and 20W-40 SL, they showed 60%,69%,73.5% and 84% of sorption, respectively. Oleic acid’s percentages were around 54.5%,62.5%,67% and 77% for oils 10W-30, Castor oil, 20W-40 SF/CF, and 20W-40 SL.

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