Harvesting of cyanobacteria and phosphorus by electrocoagulation-flocculation-flotation: Role of phosphorus precipitation in cell separations and organics destabilization

被引:3
作者
Lin, Jr-Lin [1 ,2 ]
Sidik, Fahrudin [1 ]
机构
[1] Chung Yuan Christian Univ, Dept Environm Engn, Chungli, Taiwan
[2] Chung Yuan Christian Univ, Coll Engn, Ctr Environm Risk Management, Chungli, Taiwan
关键词
Electrocoagulation; Cyanobacteria; Algae harvesting; Phosphate; PHOSPHATE REMOVAL; COAGULATION; ALUMINUM; WATER; OXIDATION; CHLORIDE; MATTER; FLOCS;
D O I
10.1016/j.watres.2024.121868
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A high level of phosphate triggers the excretion of algogenic organic matter (AOM) during algae blooming, leading to disinfection by-products (DBPs) formation. The presence of phosphate could impact cyanobacteria harvesting and AOM separations by electrocoagulation. This study aims to investigate the role of phosphate in cell separations and AOM destabilization by Al-based electrocoagulation-flocculation-flotation (EFF) for harvesting of cyanobacteria and phosphate. The Al-based EFF was conducted to harvest Microcystis aeruginosa (MA) with varied phosphate (0-10 mg/L) at 5 mA/cm2 and pH 8. Fluorescent organic fractions, molecular weight distributions, the properties of flocs and DBPs formation potential were fully investigated. The results showed that the EFF at a low level of phosphate (1 mg/L) effectively improves the harvesting of MA cells, phosphate and the reduction in dissolved organic matter (DOC) up to 99.5 %, 95 % and 50 %, respectively. However, the presence of concentrated phosphate (10 mg/L) alleviates cell harvesting and worsens AOM separations due to ineffective floc formation induced by the fast formation of inactive AlPO4 precipitates along with limited Al (OH)3. At such a condition, it worsens DBPs precursors minimization owing to AOM release from MA cells. The increase in the current density during EFF can compensate for cell harvesting efficiency even though at concentrated phosphate, but it further induces AOM release. It is concluded that Al-based EFF demonstrates an efficient harvesting of cyanobacteria, phosphorus and AOM separations from algae-laden water under phosphate impact.
引用
收藏
页数:12
相关论文
共 45 条
[1]   Organic/inorganic hybrid adsorbent for efficient phosphate removal from a reservoir affected by algae bloom [J].
An, Byungryul ;
Lee, Soonjae ;
Kim, Hee-Gon ;
Zhao, Dongye ;
Park, Jeong-Ann ;
Choi, Jae-Woo .
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY, 2019, 69 :211-216
[2]  
[Anonymous], 1978, Method 365.3 Phosphorous, All Forms (Colorimetric, Ascorbic Acid
[3]   Electrocoagulation for removal of phosphate from aqueous solution: Statistical modeling and techno-economic study [J].
Bakshi, Avishek ;
Verma, Akshaya Kumar ;
Dash, Aditya Kishore .
JOURNAL OF CLEANER PRODUCTION, 2020, 246
[5]   Phosphorus Removal from Continuous Phosphate-Contaminated Water by Electrocoagulation using Aluminum and Iron Plates Alternately as Electrodes [J].
Chen, Shaohua ;
Shi, Yiming ;
Wang, Wenlong ;
Li, Zhenyu ;
Gao, Jingqing ;
Bao, Keqian ;
Han, Runping ;
Zhang, Ruiqin .
SEPARATION SCIENCE AND TECHNOLOGY, 2014, 49 (06) :939-945
[6]   A kinetic model for electrocoagulation and its application for the electrochemical removal of phosphate ions from brewery wastewater [J].
Costa, Antony Murillo ;
Zanoelo, Everton Fernando ;
Beninca, Cristina ;
Freire, Flavio Bentes .
CHEMICAL ENGINEERING SCIENCE, 2021, 243
[7]   XPS study of basic aluminum sulphate and basic aluminium nitrate [J].
Duong, LV ;
Wood, BJ ;
Kloprogge, JT .
MATERIALS LETTERS, 2005, 59 (14-15) :1932-1936
[8]  
Eaton A., 2005, Standard methods for the examination of water and waste water
[9]   The origin of aluminum flocs in polluted streams [J].
Furrer, G ;
Phillips, BL ;
Ulrich, KU ;
Pöthig, R ;
Casey, WH .
SCIENCE, 2002, 297 (5590) :2245-2247
[10]   The chemodiversity of algal dissolved organic matter from lysed Microcystis aeruginosa cells and its ability to form disinfection by-products during chlorination [J].
Gonsior, Michael ;
Powers, Leanne C. ;
Williams, Ernest ;
Place, Allen ;
Chen, Feng ;
Ruf, Alexander ;
Hertkorn, Norbert ;
Schmitt-Kopplin, Philippe .
WATER RESEARCH, 2019, 155 (300-309) :300-309