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Iranian Journal of Environmental Health, Science and Engineering
Iranian Association of Environmental Health (IAEH)
ISSN: 1735-1979
Vol. 7, No. 3, 2010, pp. 229-240
Bioline Code: se10026
Full paper language: English
Document type: Research Article
Document available free of charge

Iranian Journal of Environmental Health, Science and Engineering, Vol. 7, No. 3, 2010, pp. 229-240

 en Treatment Of Low-Strength Industrial Wastewater Using Anaerobic Baffled Reactor
Torabian, A.; Abtahi, S. M.; Amin, M. M. & Momeni, S. A.

Abstract

The performance of an anaerobic baffled reactor at the pilot scale, with a 100-L volume and six compartments, that is used to treat low-strength industrial wastewater (671.5±49.9 mg COD/L, 350.1±36.8 mg BOD5/L and 443.8±60.7 mg SO4-2/L) was studied. The reactor was started with a hydraulic retention time (HRT) of 25 h at 35 ºC, which was gradually reduced to 3.33 h. The best reactor performance was observed with an organic loading rate (OLR) and a sulfate loading rate (SLR) of 4.45 g COD/L.d and 3.32 g SO4-2/L.d, which was obtained at a HRT of 4 h. The COD and SO4-2 removal efficiencies were 78.6% and 89.2%, respectively. Additionally, the majority of the COD and SO4-2 removal occurred in the first compartment, up to 51.2% and 69.1%, respectively. Moreover, the pH in the first compartment was also the lowest. Subsequently, when the temperature was reduced to 20 ºC at a HRT of 4 h, the maximum removal efficiencies for COD and SO4-2 decreased to 59.4% and 66.1%, respectively. In this case, the highest COD and SO4-2 removal efficiencies were observed in the third and fourth compartments, respectively, and these compartments had lower pH values. This phenomenon indicates that decrease in temperature causes transference of the acidogenic phase toward subsequent reactor compartments. In addition, these findings further show the potential for sulfate removal of the acidogenic phase

Keywords
Anaerobic baffled reactor; COD removal; Low-strength industrial wastewater; Low temperature effects; SO4-2 removal

 
© Copyright 2010 Iran Journal of EnvironHealth Sci Eng.
Alternative site location: http://diglib.tums.ac.ir/pub/

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