Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 593, Issue -, Pages 434-446Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2021.02.118
Keywords
Paper mill sludge; Treating waste with waste; Solid waste utilization; Phosphorus removal; Calcium-containing biochar
Categories
Funding
- National Key Research and Development Program of China [2019YFC1805904, 2018YFC19021(01), 2018YFC19021(02), 2018YFC19021(05)]
- National Natural Science Foundation of China [21767015, 21968014, 22008097]
- State Key Laboratory of Pulp and Paper Engineering of China [202004]
- Analysis and Testing Foundation of Kunming University of Science and Technology [2020P20191107006]
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This study proposed a simple and clean method for preparing calcium-containing biochar from paper mill sludge through thermal treatment, and analyzed its application for phosphorus removal. The experimental results showed that the biochar exhibited good phosphorus adsorption performance, making it effective for purifying wastewater with high phosphorus content.
With the increased awareness of reusing solid wastes for higher sustainability and the concern of water pollution associated with phosphorus over-emission, there are strong interests in developing solid waste based adsorbents for purifying phosphorus-containing wastewater. As a rich calcium resource, paper mill sludge (i.e., a major solid waste from pulping industry) can be used as phosphorus removal adsorbent after calcination. Thus, in this work, a simple and clean thermally treating route has been proposed for preparing calcium-containing biochar from paper mill sludge. The effect of the physicochemical proper-ties of paper mill sludge and its carbonization condition on phosphorus adsorption has been analyzed. Moreover, the influence of some key adsorption parameters, e.g., biochar dosage, initial pH of solution, co-existing anions, initial phosphorus concentration and contact time has also been investigated. The results showed that the phosphorus adsorption data could be fitted well with pseudo-second-order kinetic and Langmuir isothermal models. The calculated maximum adsorption capacity of the as-prepared optimal calcium-containing biochar could reach to 68.49 mg.g(-1) at 25 degrees C. Combined with the characterization results, it can be reasonably inferred that the adsorption process was chemisorption-dominated. Lastly, the application of this spent adsorbent in agriculture field has also been discussed. In brief, this work provided a feasible strategy for converting paper mill solid waste to an environmental functional material (i.e., calcium-rich biochar) for remediation of eutrophic water. (C) 2021 Elsevier Inc. All rights reserved.
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