Surface water treatment benefits from the presence of algae:Influence of algae on the coagulation behavior of polytitanium chloride  

作　　者：Yanxia Zhao Huiqing Lian Chang Tian Haibo Li Weiying Xu Sherub Phuntsho Kaimin Shih 

机构地区：[1]School of Water Conservancy and Environment,University of Jinan,Jinan,250022,China [2]School of Environmental Science&Engineering,Qilu University of Technology(Shandong Academy of Sciences),Jinan,250353,China [3]Environmental Engineering Department,Research Development Center,China Vanke Co.,Ltd.,Shenzhen,518083,China [4]Centre for Technology in Water and Wastewater Treatment,School of Civil and Environmental Engineering,University of Technology,Sydney,New South Wales,2007,Australia [5]Environmental Engineering Research Centre,Department of Civil Engineering,The University of Hong Kong,Hong Kong,999077,China

出　　处：《Frontiers of Environmental Science & Engineering》2021年第4期141-153,共13页环境科学与工程前沿（英文）

基　　金：This work was supported by grants from the National Natural Science Foundation of China(Grant No.51978311);the Shandong Provincial Natural Science Foundation,China(No.ZR2019BEE044).

摘　　要：Titanium-based coagulation has proved to be effective for algae-laden micro-polluted water purification processes.However,the influence of algae inclusion in surface water treatment by titanium coagulation is barely reported.This study reports the influence of both Microcystis aeruginosa and Microcystis wesenbergii in surface water during polytitanium coagulation.Jar tests were performed to evaluate coagulation performance using both algae-free(controlled)and algae-laden water samples,and floc properties were studied using a laser diffraction particle size analyzer for online monitoring.Results show that polytitanium coagulation can be highly effective in algae separation,removing up to 98%from surface water.Additionally,the presence of algae enhanced organic matter removal by up to 30%compared to controlled water containing only organic matter.Polytitanium coagulation achieved significant removal of fluorescent organic materials and organic matter with a wide range of molecular weight distribution(693–4945 Da)even in the presence of algae species in surface water.The presence of algae cells and/or algal organic matter is likely to function as an additional coagulant or flocculation aid,assisting polytitanium coagulation through adsorption and bridging effects.Although the dominant coagulation mechanisms with polytitanium coagulant were influenced by the coagulant dosage and initial solution pH,algae species in surface water could enhance the charge neutralization capability of the polytitanium coagulant.Algae-rich flocs were also more prone to breakage with strength factors approximately 10%lower than those of algae-free flocs.Loose structure of the flocs will require careful handling of the flocs during coagulation-sedimentation-filtration processes.

关 键 词：COAGULATION Polytitanium chloride Coagulation behaviour ALGAE Floc property 

分 类 号：X703[环境科学与工程—环境工程]