Preparation of sodium alginate flocculant and its application in oily sludge

• Published in: Separation science and technology Vol. 60; no. 13; pp. 1787 - 1804
• Main Authors: Yu, Lanlan, Song, Lifeng, Yang, Bo
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 02.09.2025
• Subjects: graft modification; Oily sludge treatment; quenching and tempering; sodium alginate oxide cationic flocculant
• ISSN: 0149-6395; 1520-5754
• DOI: 10.1080/01496395.2025.2514956

A large amount of oily sludge will be generated in the process of oilfield gathering and transportation, and it is urgent to treat it in a timely and effective manner, and the use of high-efficiency flocculant for quenching and tempering is the key technology link for the treatment of oily sludge. In this paper, sodium alginate (SA) was used as raw material, sodium periodate was used for oxidation to prepare sodium alginate oxide (OSA), and potassium persulfate was used as the initiator to graft and modify sodium alginate oxide with dimethyl diallyl ammonium chloride (DMDAAC) to prepare a polymer flocculant, sodium alginate cationic flocculant OSA-PDMDAAC and applied to oily sludge treatment. The optimal preparation conditions were as follows: the dosage of oxidant was 4%, the dosage of initiator was 1%, the mass ratio of w(DMDAAC):w(OSA) was 3:1, and the reaction temperature was 75℃. When the flocculant prepared under the optimal preparation conditions was applied to the treatment of oily sludge, the deoiling rate of OSA-PDMDAAC could reach 86% when the dosage was 80 mg/L, the temperature was 55℃, and the pH was 9, which was better than that of the on-site use of PAM and PAC.