ORIGINAL RESEARCH
Enhancing the Removal of Diethylhexyl Phthalate
from Secondary Effluent Using Guar Gum
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Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, 5088 Xincheng
Street, Changchun, 130118, P. R. China
Submission date: 2023-12-01
Final revision date: 2024-01-19
Acceptance date: 2024-02-28
Online publication date: 2025-01-16
Publication date: 2025-05-09
Corresponding author
Mengnan Shen
Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, 5088 Xincheng
Street, Changchun, 130118, P. R. China
Pol. J. Environ. Stud. 2025;34(4):4435-4444
KEYWORDS
TOPICS
ABSTRACT
With the increasing global concern about environmental issues, researchers are increasingly
interested in the use of natural biopolymers to replace inorganic coagulants in order to reduce the use of
inorganic coagulants. The removal of diethylhexyl phthalate (DEHP) from secondary effluent by guar
gum was investigated and compared with that of alum. Guar gum effectively removed approximately
92.11% of turbidity, 71.47% of total phosphorus, and 54.84% of chemical oxygen demand at a dosage of
3 mg L-1. Further, evaluation and optimization of reaction conditions of coagulation-flocculation process
in wastewater treatment by Box-Behnken design of Response Surface Methodology (RSM). The results
indicated that a guar gum dosage of 3 mg L-1 at pH=7 resulted in the removal of 78.93% of DEHP. SEM
showed that guar gum produces flocs with many voids in them compared with alum. This illustrates the
greater availability of guar gum in catching and removing particles in suspension and DEHP compared
with alum. FTIR indicated that organic matter in the effluent had chemically attached to the coagulants,
leading to the removal of the organic matter. Given its nontoxicity and biodegradability, guar gum
demonstrates promising potential as a coagulant in wastewater treatment.
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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