ORIGINAL RESEARCH
Effective Removal of Algae from Water by Diatomite Enhanced Graphene Oxide Flocculation
Lili Dong 1, 2  
,   Mingxin Huo 1, 2  
 
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1
Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China
2
School of Environment, Northeast Normal University, Changchun 130117, China
CORRESPONDING AUTHOR
Mingxin Huo   

Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China
Submission date: 2020-06-22
Final revision date: 2020-12-01
Acceptance date: 2020-12-25
Online publication date: 2021-06-01
Publication date: 2021-07-29
 
Pol. J. Environ. Stud. 2021;30(5):3955–3962
 
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ABSTRACT
The ability of graphene oxide (GO) to function as a flocculant capable of mediating the removal of algae and associated extracellular organic matter (EOM) from water was assessed. GO was demonstrated to mediate the dose-dependent removal of algae via flocculation, with 40 mg/L GO being sufficient to remove 100% of chlorophyll-a (chl-a) and 99.1% of the UV254. Diatomite addition failed to enhance GO flocculation efficiency or to reduce the necessary GO dosage, although it did result in a significantly reduced settling time, with denser floc and a corresponding increase in supernatant ratio. GO-mediated algae flocculation was primarily achieved via netting and bridging mechanisms, with diatomite addition leading to the conversion of a subset of two-dimensional GO nets into threedimensional nets containing a diatomite core. Flocculation efficiency was comparable under acidic and neutral conditions but declined significantly with rising pH when pH≥7, with just 13.8% of chl-a being removed at pH of 10. At pH of 5, more than 60% of EOM and 57.6% to 90.1% of the disinfection byproduct formation potentials were reduced following the GO/diatomite flocculation process, and following flocculation the solution always had a final pH of 7.4±0.4 regardless of the starting pH.
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ISSN:1230-1485