Treatment of highly concentrated wastewater containing multiple synthetic dyes by a combined process of coagulation/flocculation and nanofiltration

Can Zeng Liang, Shi Peng Sun*, Fu Yun Li, Yee Kang Ong, Tai Shung Chung

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    466 Scopus citations

    Abstract

    The treatments of dyes (acid, basic and reactive dyes) wastewater were studied by applying individual coagulation/flocculation (CF) and nanofiltration (NF) processes as well as their combination (referred as CF-NF). For the treatment of highly concentrated multiple dyes wastewater (MDW, 1000ppm), polyaluminum chloride (PAC) and polydiallyldimethyl ammonium chloride (PDDA) were found to be the most effective coagulant and flocculant, respectively. The CF process can achieve about 90% of dye removal at the optimal dosage of PAC/PDDA=400/200ppm, and the MDW with pH>3 is favorable for the CF treatment. A positively charged NF hollow fiber membrane was fabricated and used for NF treatment. It is able to remove almost 100% dyes with a permeate flux of about 1.0Lm-2h-1 under an operating pressure of 1bar. The combination of CF and NF can complement each other[U+05F3]s strengths and overcome their individual limitations. The NF treatment can completely remove the strong color left in CF treated dye solutions, while the efficiency of coagulant/flocculant is improved by treating NF concentrated streams and subsequently results in much less sludge. In addition, membrane fouling is abated and NF permeate flux is increased by applying the CF process as a pretreatment. Thus, the combination of CF-NF improves the overall performance for the dyes wastewater treatment.

    Original languageEnglish (US)
    Pages (from-to)306-315
    Number of pages10
    JournalJournal of Membrane Science
    Volume469
    DOIs
    StatePublished - Nov 1 2014

    Keywords

    • Coagulation/flocculation
    • Hollow fiber membranes
    • Multiple dye wastewater
    • Nanofiltration

    ASJC Scopus subject areas

    • Biochemistry
    • General Materials Science
    • Physical and Theoretical Chemistry
    • Filtration and Separation

    Fingerprint

    Dive into the research topics of 'Treatment of highly concentrated wastewater containing multiple synthetic dyes by a combined process of coagulation/flocculation and nanofiltration'. Together they form a unique fingerprint.

    Cite this