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| Promotion effect of Microcystis aeruginosa on defluorination by coagulation and its mechanism analysis |
| XIANG Yu1,2, XU Hui2, LI Kun1, WANG Xi2,3, WU Hao-Lan2,4, FAN Hua1 |
1. School of Resources Environment and Chemical Engineering, Nanchang University, Nanchang 330031, China;
2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. School of Water Resources and Environment Engineering, China University of Geosciences(Beijing), Beijing 100083, China |
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Abstract Microcystis aeruginosa and aluminum chloride (AlCl3·6H2O) were chosen to research the effect of algae on the coagulation removal mechanism of fluoride through 3D-EEM, FE-SEM. The results showed that Microcystis aeruginosa had an obvious promotion effect on defluorination under the conditions of pH 7.0, 8.0, 9.0 and Al dosage of 20.0~80.0mg/L, which was mainly due to the surface adsorption of fluoride by algal flocs. Microcystis aeruginosa and the hydrolyzed products of coagulant aggregated into larger flocs by bridging and sweep flocculation. The larger the floc size was, the larger the fluoride removal rate was. When the pH value was 7.0 and the Al dosage was 40.0mg/L, the flocs reached the maximum particle size (500μm), and the fluoride removal rate was the largest (77.37%). When the Al dosage was 80mg/L, the algal cells were seriously damaged and the organic matter was released, which hindered the defluorination process. The results of floc breakage and adsorption experiments showed that certain strength breakage of algae floc could increase the adsorption site and thus improved the removal rate of fluoride. Excessive breakage led to too small particle size of algae flocs, resulting in the reduction of fluoride adsorption efficiency.
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Received: 25 August 2020
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| [1] |
Zhang L E, Huang D, Yang J, et al. Probabilistic risk assessment of Chinese residents' exposure to fluoride in improved drinking water in endemic fluorosis areas[J]. Environmental Pollution, 2017,222:118-125.
|
| [2] |
Zhu J, Lin X, Wu P, et al. Fluoride removal from aqueous solution by Al(Ⅲ)-Zr(IV) binary oxide adsorbent[J]. Applied Surface Science, 2015,357:91-100.
|
| [3] |
Dreveton A. Overview of the Fluorochemicals Industrial Sectors[J]. Procedia Engineering, 2016,138:240-247.
|
| [4] |
Ozairi N, Mousavi S A, Samadi M T, et al. Removal of fluoride from water using coagulation-flocculation process:a comparative study[J]. Desalination and Water Treatment, 2020,180:265-270.
|
| [5] |
Bhatnagar A, Kumar E, Sillanp M. Fluoride removal from water by adsorption-Areview[J]. Chemical Engineering Journal, 2011,171(3):811-840.
|
| [6] |
Martyna G, Katarzyna M-N, Eftekhar A A. Removal of fluoride from multicomponent water solutions with the use of monovalent selective ion-exchange membranes[J]. Science of the Total Environment, 2020, 722:137681.
|
| [7] |
Belkada F D, Kitous O, Drouiche N, et al. Electrodialysis for fluoride and nitrate removal from synthesized photovoltaic industry wastewater[J]. Separation and Purification Technology, 2018,204:108-115.
|
| [8] |
Amor Z, Bariou B, Mameri N, et al. Fluoride removal from brackish water by electrodialysis[J]. Desalination, 2001,133(3):215-223.
|
| [9] |
Miretzky P, Cirelli A F. Fluoride removal from water by chitosan derivatives and composites:A review[J]. Journal of Fluorine Chemistry, 2011,132(4):231-240.
|
| [10] |
Wang X, Xu H, Wang D. Mechanism of fluoride removal by AlCl3 and Al13:the role of aluminum speciation[J]. Journal of Hazardous Materials, 2020,398:122987.
|
| [11] |
Landsberg, Jan H. The effects of harmful algal blooms on aquatic organisms[J]. Reviews in Fisheries Science, 2002,10(2):113-390.
|
| [12] |
Henderson R K, Parsons S A, Jefferson B. The impact of differing cell and algogenic organic matter (AOM) characteristics on the coagulation and flotation of algae[J]. Water Research, 2010,44(12):3617-3624.
|
| [13] |
Takaara T, Sano D, Konno H, et al. Affinity isolation of algal organic matters able to form complex with aluminium coagulant[J]. Water Science & Technology Water Supply, 2004,4(5/6):95-102.
|
| [14] |
Chen W, Westerhoff P, Leenheer J A, et al. Fluorescence excitation-emission matrix regional integration to quantify spectra for dissolved organic matter[J]. Environmental science & Technology, 2015,37(24):5701-5710.
|
| [15] |
He Z, Lan H, Gong W, et al. Coagulation behaviors of aluminum salts towards fluoride:Significance of aluminum speciation and transformation[J]. Separation & Purification Technology, 2016,165:137-144.
|
| [16] |
Gong W X, Qu J H, Liu R P, et al. Effect of aluminum fluoride complexation on fluoride removal by coagulation[J]. Colloids & Surfaces A Physicochemical & Engineering Aspects, 2012,395(1):88-93.
|
| [17] |
李影影,董黎明,李梦娅,等.固体浓度及上清液有机物对柠檬酸污泥pH缓冲容量的影响[J]. 环境化学, 2018,37(3):584-590. Yingying L I, Liming D, Mengya L I, et al. Effects of solid concentration and organic matter in supernatant on the pH buffering capacity of citric acid sludge[J]. Environmental Chemistry, 2018, 37(3):584-590.
|
| [18] |
Deng H, Yu X. Fluoride sorption by metal ion-loaded fibrous protein[J]. Industrial & Engineering Chemistry Research, 2012,51(5):2419-2427.
|
| [19] |
Her N, Amy G, Park H R, et al. Characterizing algogenic organic matter (AOM) and evaluating associated NF membrane fouling[J]. Water Research, 2004,38(6):1427-1438.
|
| [20] |
Li L, Gao N, Deng Y, et al. Characterization of intracellular & extracellular algae organic matters (AOM) of Microcystic aeruginosa and formation of AOM-associated disinfection byproducts and odor & taste compounds[J]. Water Research, 2012,46(4):1233-1240.
|
| [21] |
Gonzalez-Torres A, Putnam J, Jefferson B, et al. Examination of the physical properties of Microcystis aeruginosa flocs produced on coagulation with metal salts[J]. Water Research, 2014,60:197-209.
|
| [22] |
Cloete T E, Oosthuizen D J. The role of extracellular exopolymers in the removal of phosphorus from activated sludge[J]. Water Research, 2001,35(15):3595-3598.
|
| [23] |
Plekhanov S E, Chemeris Y K. Early toxic effects of zinc, cobalt, and cadmium on photosynthetic activity of the green alga chlorella pyrenoidosa chick S-39[J]. Biology Bulletin of the Russian Academy of Sciences, 2003,30(5):506-511.
|
| [24] |
Dhir B, Sharmila P, Saradhi P P, et al. Physiological and antioxidant responses of Salvinia natans exposed to chromium-rich wastewater[J]. Ecotoxicology & Environmental Safety, 2009,72(6):1790-1797.
|
| [25] |
Pivokonsky M, Safarikova J, Baresova M, et al. A comparison of the character of algal extracellular versus cellular organic matter produced by cyanobacterium, diatom and green alga[J]. Water Research, 2014,51(15):37-46.
|
| [26] |
Mittal Y, Srivastava P, Kumar N, et al. Remediation of fluoride contaminated water using encapsulated active growing algae[J]. Environmental Technology & Innovation, 2020,19:100855.
|
| [27] |
李振亮,张代钧,卢培利,等.活性污泥絮体粒径分布与分形维数的影响因素[J]. 环境科学, 2013,34(10):3975-3980. Li Z L, Zhang D J, Lu P L, et al. Influencing factors of floc size distribution and fractal dimension of activated sludge[J]. Environmental Science, 2013,34(10):3975-3980.
|
| [28] |
Li R, Gao B, Huang X, et al. Compound bioflocculant and polyaluminum chloride in kaolin-humic acid coagulation:Factors influencing coagulation performance and floc characteristics[J]. Bioresource Technology, 2014,172:8-15.
|
| [29] |
He Z, Liu R P, Xu J, et al. Defluoridation by Al-based coagulation and adsorption:Species transformation of aluminum and fluoride[J]. Separation and Purification Technology 2015,148(1):68-75.
|
|
|
|
