Premium
Biodegradability of slaughterhouse wastewater with high blood content under anaerobic and aerobic conditions
Author(s) -
Pozo Rodrigo del,
Taş Didem Okutman,
Dulkadiroğlu Hakan,
Orhon Derin,
Diez Victorino
Publication year - 2003
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.753
Subject(s) - anaerobic exercise , biodegradation , chemistry , effluent , pulp and paper industry , wastewater , chemical oxygen demand , respirometry , fraction (chemistry) , bioreactor , hydrolysis , chromatography , environmental chemistry , waste management , organic chemistry , biology , physiology , engineering
In this work, the biodegradability of wastewater from a slaughterhouse located in Keşan, Turkey, was studied under aerobic and anaerobic conditions. A very high total COD content of 7230 mg dm −3 was found, due to an inefficient blood recovery system. Low BOD 5 /COD ratio, high organic nitrogen and soluble COD contents, were in accordance with a high blood content. A respirometry test for COD fractionation showed a very low readily biodegradable fraction ( S S ) of 2%, a rapidly hydrolysable fraction ( S H ) of 51%, a slowly hydrolysable fraction ( X S ) of 33% and an inert fraction of 6%. Kinetic analysis revealed that hydrolysis rates were much slower than these of domestic sewage. The results underlined the need for an anaerobic stage prior to aerobic treatment. Tests with an anaerobic batch reactor indicated efficient COD degradation, up to around 80% removal. Further anaerobic degradation of the remaining COD was much slower and resulted in the build up of inert COD compounds generated as part of the metabolic activities in the anaerobic reactor. Accordingly, it is suggested that an appropriate combination of anaerobic and aerobic reactors would have to limit anaerobic degradation to around 80% of the tCOD and an effluent concentration above 1000 mg dm −3 , for the optimum operation of the following aerobic stage. © 2003 Society of Chemical Industry