The Treatability of Chromium Tannery Wastes


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Kabdaşlı N. I., Tünay O., Orhon D.

WATER SCIENCE AND TECHNOLOGY, cilt.28, sa.2, ss.99-105, 1993 (SCI-Expanded)

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 28 Sayı: 2
  • Basım Tarihi: 1993
  • Dergi Adı: WATER SCIENCE AND TECHNOLOGY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Agricultural & Environmental Science Database, Analytical Abstracts, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Compendex, EMBASE, Environment Index, Geobase, MEDLINE, Pollution Abstracts, Public Affairs Index, Veterinary Science Database
  • Sayfa Sayıları: ss.99-105
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

Leather processing industry wastewaters contain several conventional pollutants as well as micropollutants.

Conventional pollutants can be effectively treated although considerable treatment comprised of several

stages is required. However, the potential of conventional methods to remove COD and micropollutants has

not been fully explored. The purpose of this paper is to investigate the extent of COD removal by

conventional methods. Experimental studies are conducted using raw wastewaters of industries applying

chromium tanning to cattlenhides and sheepskins. Biological treatability after pretreatment by chemical

coagulation is assessed using a lab-scale continuous activated sludge system. Results indicate that chemical

coagulation produces wastewaters with a COD of around 2000 mg/l almost independent of raw wastewater

quality. Activated sludge operated at 0.17 g BODs/g MLSS.d loading is found to provide limited nitrification

and almost complete BODs removal while the COD could only be reduced to around 500 mg/l. The residual

COD identified using a newly developed experimental approach shows that it cannot be reduced lower than

300-550 mg/l.