Treatment of coke wastewater in a sequential batch reactor (SBR) at pilot plant scale.
Coke wastewater is a highly toxic industrial effluent which is usually treated by a combination of physico-chemical and biological treatments. With the aim of completing prior studies carried out in CSTR, in this work we studied the treatment of coke wastewater in a pilot plant equipped with a 400 L stripping tank, a 350 L neutralization/homogenization tank and a 6 m high 1500 L sequential batch reactor (SBR), controlled by a PLC. Ammonia stripping efficiencies of 96% were obtained for HRT of 66 h. The biological treatment in the SBR led to removal efficiencies of 85% COD, 98% thiocyanate and 99% phenols for HRT of 115 h. Final concentrations in the effluent of 1.8 mg phenols/L, 5.4 mg SCN/L, 206 mg COD/L and 78 mg N-NH(4)(+)/L were obtained.
Marañón
E
E
Department of Chemical and Environmental Engineering, Higher Polytechnic School of Engineering, University of Oviedo, 33204 Gijón, Spain. emara@uniovi.es
Vázquez
I
I
Rodríguez
J
J
Castrillón
L
L
Fernández
Y
Y
López
H
H
D000327:Adsorption; D000641:Ammonia; D001673:Biodegradation, Environmental; D019149:Bioreactors; D001709:Biotechnology / Q000379:methods*; D003077:Coke / Q000032:analysis*; D004867:Equipment Design; D007220:Industrial Waste; D019800:Phenol / Q000737:chemistry; D012722:Sewage; D013861:Thiocyanates / Q000737:chemistry; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*
D003077:Coke; D007220:Industrial Waste; D012722:Sewage; D013861:Thiocyanates; D014874:Water Pollutants, Chemical; D019800:Phenol; D000641:Ammonia; C031760:thiocyanate