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

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Frontiers of Environmental Science & Engineering 2021年第4期15卷 141-153页

作者： Yanxia Zhao Huiqing Lian Chang Tian Haibo Li Weiying Xu Sherub Phuntsho Kaimin Shih School of Water Conservancy and Environment University of JinanJinan250022China School of Environmental Science&Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan250353China Environmental Engineering Department Research Development CenterChina Vanke Co.Ltd.Shenzhen518083China Centre for Technology in Water and Wastewater Treatment School of Civil and Environmental EngineeringUniversity of TechnologySydneyNew South Wales2007Australia Environmental Engineering Research Centre Department of Civil EngineeringThe University of Hong KongHong Kong999077China

Titanium-based coagulation has proved to be effective for algae-laden micro-polluted water purification ***,the influence of algae inclusion in surface water treatment by titanium coagulation is barely *** study reports the influence of both Microcystis aeruginosa and Microcystis wesenbergii in surface water during polytitanium *** 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 *** show that polytitanium coagulation can be highly effective in algae separation,removing up to 98%from surface ***,the presence of algae enhanced organic matter removal by up to 30%compared to controlled water containing only organic *** 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 *** 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 *** 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 ***-rich flocs were also more prone to breakage with strength factors approximately 10%lower than those of algae-free *** 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

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Enhanced cross-flow filtration with flat-sheet ceramic membranes by titanium-based coagulation for membrane fouling control

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Frontiers of Environmental Science & Engineering 2022年第8期16卷 269-284页

作者： Xiaoman Liu Chang Tian Yanxia Zhao Weiying Xu Dehua Dong Kaimin Shih Tao Yan Wen Song School of Water Conservancy and Environment University of JinanJinan 250022China School of Environmental Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China School of Material Science and Engineering University of JinanJinan 250022China Department of Civil Engineering The University of Hong KongHong Kong 999077China

Application of ceramic membrane(CM)with outstanding characteristics,such as high flux and chemical-resistance,is inevitably restricted by membrane *** was an economical and effective technology for membrane fouling *** study investigated the filtration performance of ceramic membrane enhanced by the emerging titanium-based coagulant(polytitanium chloride,PTC).Particular attention was paid to the simulation of ceramic membrane fouling using four widely used mathematical *** show that filtration of the PTC-coagulated effluent using flat-sheet ceramic membrane achieved the removal of organic matter up to 78.0%.Permeate flux of ceramic membrane filtration reached 600 L/(m2$h),which was 10-fold higher than that observed with conventional polyaluminum chloride(PAC)*** PTC,fouling of the ceramic membrane was attributed to the formation of cake layer,whereas for PAC,standard filtration/intermediate filtration(blocking of membrane pores)was also a key fouling *** sum up,cross-flow filtration with flat-sheet ceramic membranes could be significantly enhanced by titanium-based coagulation to produce both high-quality filtrate and high-permeation flux.

关键词： Ceramic membrane Coagulation polytitanium chloride Membrane fouling

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