• Treating tannery waste using stack flue gas recycle, sulfide precipitation, chromium removal, ferrous sulfide recycle, ferrous ion recycle, filtration, flotation, membrane and bioreactor.

    Author(s):
    Milos Krofta, LNSP Nagghappan, Lawrence K Wang (see profile) , Mu-Hao Sung Wang
    Editor(s):
    Yuriy I. Pankivskyi
    Date:
    2022
    Group(s):
    Science, Technology, Engineering and Mathematics
    Subject(s):
    Factory and trade waste, Recycling (Waste, etc.)
    Item Type:
    Book chapter
    Tag(s):
    stack flue gas recycle, stack flue gas recycle, sulfide precipitation, chromium removal, protein recovery, ferrous sulfide recycle, dissolved air flotation, flotation membrane bioreactor, green house gas reduction, tannery beamhouse and tanyard wastes
    Permanent URL:
    https://doi.org/10.17613/2j8y-6g69
    Abstract:
    The innovative approach of reducing the tannery pollutant load involves (a) the segregation of the various streams (beam house waste stream and tanyard waste stream); (b) first stage beam house waste pretreatment: recycle of carbon dioxide in the stack flue gas for removing the protein, BOD, and COD from the beam waste stream, and recovery and reuse of the recovered protein; (c) second stage beam house waste pretreatment: addition of ferrous sulfate to the carbonation effluent for removing the sulfide, BOD, COD and TSS; and recovery of ferrous sulfide waste sludge; (d) total pollutant reduction from the overall beam house waste pretreatment: TSS (87 %), COD (41.6 %), BOD (39.8 %), chromium (99.82 %), sulfide (99.94 %); (e) first stage tanyard waste pretreatment: screening removal of large substance, TSS, etc.; (f) second stage tanyard waste pretreatment: reuse of ferrous sulfide waste sludge for the removal of toxic chromium and other heavy metals and in turn, the release of ferrous ions; reuse of ferrous ions as coagulant; and separation of chromium sulfide sludge, BOD, COD, TSS by dissolved air flotation (DAF); (g) total pollutant reduction from the overall tanyard waste pretreatment: TSS (93.2 %), COD (62.9 %), BOD (64.3 %), chromium (99.97 %), sulfide (99.10 %); (h) combination of both the beamhouse waste pretreatment effluent and the tanyard waste pretreatment effluent for the end-of-the-pipe treatment by biological process, DAF and membrane filtration; and (i) development of a new flotation-membrane bioreactor (FMBR) process including the required biological process, DAF and membrane filtration for overall cost saving in the final end-of-the-pipe treatment.
    Notes:
    Memoir, Dedication, Milos Krofta, Lenox Institute of Water Technology (LIWT), Krofta Engineering Corporation (KEC), Tannery waste treatment, Beamhouse waste pretreatment, Tanyard waste pretreatment,
    Metadata:
    Published as:
    Book chapter    
    Status:
    Published
    Last Updated:
    4 months ago
    License:
    All Rights Reserved
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