Nitrogen removal from tannery wastewater by protein recovery.
Nitrogen removal from wastewaters has gained importance in recent years. In this paper protein precipitation and recovery potential of leather tanning industry wastewaters were experimentally evaluated. A protein profile for all sources was prepared. Liming was determined to be the most important protein source. Composite samples were made up to assess the protein precipitation applications. Isoelectric pH precipitation yielded around 50% protein removal between the optimum pH interval of 2.1-3.8. FeCl3 proved to be a very effective means of protein removal providing over 60% efficiency. Polyelectrolyte precipitation did not yield satisfactory results. Magnesium ammonium phosphate precipitation followed by acid precipitation of protein provided 85% ammonia removal in addition to 50% protein removal.
Kabdaşli
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I
Istanbul Technical University, Civil Engineering Faculty, Environmental Engineering Department, Ayazağa Kampüsü, 34469, Maslak, Istanbul, Turkey. ikabdasli@ins.itu.edu.tr
Olmez
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T
Tünay
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O
D011232:Chemical Precipitation; D006490:Hemostatics / Q000737:chemistry; D017616:Magnesium Compounds / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification*; D010710:Phosphates / Q000737:chemistry; D011506:Proteins / Q000737:chemistry; D000069877:Struvite; D013783:Textile Industry; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D006490:Hemostatics; D017616:Magnesium Compounds; D010710:Phosphates; D011506:Proteins; D000069877:Struvite; D009584:Nitrogen