YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • ASCE
    • Journal of Environmental Engineering
    • View Item
    •   YE&T Library
    • ASCE
    • Journal of Environmental Engineering
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    Development of a Membrane Desalination and Coprecipitation System for Enhanced Reclamation of Cooling Tower Water: Mechanism Evaluation and Pilot-Scale Study

    Source: Journal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 006::page 04025028-1
    Author:
    Jin-Min Li
    ,
    Bo-Ming Yang
    ,
    Chathura Dhanasinghe
    ,
    Rao Y. Surampalli
    ,
    Tian C. Zhang
    ,
    Chih-Ming Kao
    DOI: 10.1061/JOEEDU.EEENG-8006
    Publisher: American Society of Civil Engineers
    Abstract: The raw water in southern Taiwan has high hardness and high silica (SiO2) characteristics. If the high SiO2-content water is used as a makeup water source for cooling towers (CT), the SiO2 concentration in the tower blowdown (BD) would exceed the saturation level (120  mg/L) within a short operational period. The objective of this study was to develop a combined coprecipitation (first stage) and membrane desalination [ultrafiltration (UF)/reverse osmosis (RO) (second stage)] system to enhance the water reclamation efficiency of cooling tower (CT) in the petrochemical industry. Flue gas desulfurization (FGD) wastewater containing magnesium ions (Mg2+) and cooling tower blowdown (CTBD) were mixed, and Mg2+ and silica (SiO2) were removed through the coprecipitation process (core mechanism). The supernatant was directed to the UF/RO for reclamation. Results show that alkaline environments promoted the creation of Mg2+─SiO2 coprecipitates [Mg3Si2O5(OH)4, Mg2SiO4 and MgSiO3], which allowed for the effective removal of SiO2. Under alkaline conditions, when the molar ratio of Mg2+/calcium  ions  (Ca2+)∶SiO2 was 1∶1, Mg2+ exhibited more pronounced advantages for SiO2 removal. The maximum SiO2 removal rate reached 99% in the Mg2+∶SiO2 group, compared to 75% in the Ca2+∶SiO2 group. Mg2+ showed a stronger correlation (R2=0.95) with SiO2 removal than Ca2+ (R2=0.61355). Following the coprecipitation process, the supernatant was transferred to the UF/RO for desalination. The pilot-scale study results indicate that up to 92% of SiO2 in CTBD could be removed. When the volume ratio of FGD wastewater to CTBD was 1∶5 (pH=10.5), the SiO2 concentration was reduced to below 25  mg/L. The UF/RO treatment results show that the conductivity, alkalinity, and Mg2+ concentrations were reduced to 179  μS/cm, 15 mg as CaCO3/L, and not detectable, respectively. The regenerated water is suitable for reuse as makeup water for CT.
    • Download: (3.200Mb)
    • Show Full MetaData Hide Full MetaData
    • Get RIS
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Development of a Membrane Desalination and Coprecipitation System for Enhanced Reclamation of Cooling Tower Water: Mechanism Evaluation and Pilot-Scale Study

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4307798
    Collections
    • Journal of Environmental Engineering

    Show full item record

    contributor authorJin-Min Li
    contributor authorBo-Ming Yang
    contributor authorChathura Dhanasinghe
    contributor authorRao Y. Surampalli
    contributor authorTian C. Zhang
    contributor authorChih-Ming Kao
    date accessioned2025-08-17T23:01:40Z
    date available2025-08-17T23:01:40Z
    date copyright6/1/2025 12:00:00 AM
    date issued2025
    identifier otherJOEEDU.EEENG-8006.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4307798
    description abstractThe raw water in southern Taiwan has high hardness and high silica (SiO2) characteristics. If the high SiO2-content water is used as a makeup water source for cooling towers (CT), the SiO2 concentration in the tower blowdown (BD) would exceed the saturation level (120  mg/L) within a short operational period. The objective of this study was to develop a combined coprecipitation (first stage) and membrane desalination [ultrafiltration (UF)/reverse osmosis (RO) (second stage)] system to enhance the water reclamation efficiency of cooling tower (CT) in the petrochemical industry. Flue gas desulfurization (FGD) wastewater containing magnesium ions (Mg2+) and cooling tower blowdown (CTBD) were mixed, and Mg2+ and silica (SiO2) were removed through the coprecipitation process (core mechanism). The supernatant was directed to the UF/RO for reclamation. Results show that alkaline environments promoted the creation of Mg2+─SiO2 coprecipitates [Mg3Si2O5(OH)4, Mg2SiO4 and MgSiO3], which allowed for the effective removal of SiO2. Under alkaline conditions, when the molar ratio of Mg2+/calcium  ions  (Ca2+)∶SiO2 was 1∶1, Mg2+ exhibited more pronounced advantages for SiO2 removal. The maximum SiO2 removal rate reached 99% in the Mg2+∶SiO2 group, compared to 75% in the Ca2+∶SiO2 group. Mg2+ showed a stronger correlation (R2=0.95) with SiO2 removal than Ca2+ (R2=0.61355). Following the coprecipitation process, the supernatant was transferred to the UF/RO for desalination. The pilot-scale study results indicate that up to 92% of SiO2 in CTBD could be removed. When the volume ratio of FGD wastewater to CTBD was 1∶5 (pH=10.5), the SiO2 concentration was reduced to below 25  mg/L. The UF/RO treatment results show that the conductivity, alkalinity, and Mg2+ concentrations were reduced to 179  μS/cm, 15 mg as CaCO3/L, and not detectable, respectively. The regenerated water is suitable for reuse as makeup water for CT.
    publisherAmerican Society of Civil Engineers
    titleDevelopment of a Membrane Desalination and Coprecipitation System for Enhanced Reclamation of Cooling Tower Water: Mechanism Evaluation and Pilot-Scale Study
    typeJournal Article
    journal volume151
    journal issue6
    journal titleJournal of Environmental Engineering
    identifier doi10.1061/JOEEDU.EEENG-8006
    journal fristpage04025028-1
    journal lastpage04025028-12
    page12
    treeJournal of Environmental Engineering:;2025:;Volume ( 151 ):;issue: 006
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian