Colour removal from fermentation industry effluents

B. Inanc*, F. Ciner, I. Ozturk

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

33 Citations (Scopus)

Abstract

Large amounts of effluents from the fermentation industry are characterized by high COD and colour. Although significant reduction in COD is achieved through biological treatment processes, a substantial amount of colour remains. Coagulation and flocculation with alum and iron salts are not effective for colour removal. This is due to the nature of colour causing compounds which are almost totally dissolved and resistant to biodegradation. Hence, fermentation industries face difficulties in discharging their coloured effluents into either sewers or surface waters. In this study, colour removal from biological treatment plant effluents of a fermentation industry with lime and ozone was investigated experimentally. Optimum lime dose for reducing the colour to values around 1000 Pt-Co was found as 10.0 g/l, while 0.9 g/l ozone was necessary to obtain the same residual colour. Economic evaluation has indicated that cost of lime treatment was 1.3 to 1.4 USD/m3 while it was 2.5 USD/m3 for ozone treatment. Annual total costs for lime and ozone treatment were also estimated as 2 million USD and 3.65 million USD, respectively.

Original languageEnglish
Pages (from-to)331-338
Number of pages8
JournalWater Science and Technology
Volume40
Issue number1
DOIs
Publication statusPublished - 1999
Externally publishedYes
EventProceedings of the 1998 4th International Symposium on Waste Management Problems in Agro-Industries - Istanbul, Turkey
Duration: 23 Sept 199825 Sept 1998

Keywords

  • Colour
  • Fermentation industry
  • Lime
  • Ozone
  • Physico-chemical processes
  • Treatment
  • Wastewater

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