Performance of sulfidogenic anaerobic baffled reactor (ABR) treating acidic and zinc-containing wastewater.
The applicability of anaerobic baffled reactor (ABR) was investigated for the treatment of acidic (pH 4.5-7.0) wastewater containing sulfate (1000-2000 mg/L) and Zn (65-200mg/L) at 35 degrees C. The ABR consisted of four equal stages and lactate was supplemented (COD/SO(4)(2-)=0.67) as carbon and energy source for sulfate reducing bacteria (SRB). The robustness of the system was studied by decreasing pH and increasing Zn, COD, and sulfate loadings. Sulfate-reduction efficiency quickly increased during the start-up period and reached 80% within 45 days. Decreasing feed pH, increasing feed sulfate and Zn concentrations did not adversely affect system performance as sulfate reduction and COD removal efficiencies were within 62-90% and 80-95%, respectively. Although feed pH was steadily decreased from 7.0 to 4.5, effluent pH was always within 6.8-7.5. Over 99% Zn removal was attained throughout the study due to formation of Zn-sulfide precipitate.
Bayrakdar
Alper
A
Environmental Engineering Department, Harran University, Osmanbey Campus, Sanliurfa, Turkey.
Sahinkaya
Erkan
E
Gungor
Murat
M
Uyanik
Sinan
S
Atasoy
A Dilek
AD
D000143:Acids / Q000737:chemistry*; D000468:Alkalies / Q000737:chemistry; D000693:Anaerobiosis; D001673:Biodegradation, Environmental; D019149:Bioreactors; D011232:Chemical Precipitation; D004583:Electrons; D005232:Fatty Acids, Volatile; D006863:Hydrogen-Ion Concentration; D010084:Oxidation-Reduction; D010100:Oxygen / Q000302:isolation & purification; D013431:Sulfates / Q000302:isolation & purification*; D014865:Waste Disposal, Fluid; D018508:Water Purification; D015032:Zinc / Q000302:isolation & purification*
D000143:Acids; D000468:Alkalies; D005232:Fatty Acids, Volatile; D013431:Sulfates; D015032:Zinc; D010100:Oxygen