Influence of feedstock and bleaching technologies on methanogenic toxicity of kraft mill wastewater.
Chlorine-bleached effluent is problematic for anaerobic wastewater treatment due to its high toxicity against methanogenic bacteria. To date, alternative bleaching processes are being introduced, such as elemental chlorine-free (ECF) and total chlorine-free (TCF). The purpose of this study was to investigate the influence of bleaching technologies and different types of feedstock on methanogenic activity. In order to compare the toxicity of the different bleaching sequences per unit of COD, the 50%-inhibitory concentration (50% IC) for methanogenic bacteria of the different bleaching effluents were compared. The results show that there is no direct relationship between the effluent's methanogenic toxicity and the bleaching sequences. Methanogenic toxicity ranged from 0.6 to 2.4 g COD/L.
Vidal
G
G
Environmental Science Center EULA-Chile, University of Concepción. P.O. Box 160, C. Concepción, Chile. glvidal@udec.cl
Diez
M C
MC
D001421:Bacteria, Anaerobic; D002713:Chlorine / Q000633:toxicity*; D007220:Industrial Waste; D007928:Lethal Dose 50; D010209:Paper; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification
D007220:Industrial Waste; D002713:Chlorine