A process for producing lignocellulosic flocs from NSSC spent liquor.
Presently, the spent liquor (SL) of neutral sulfite semi chemical (NSSC) pulping process is treated in the waste water system. In this work, a new process for isolating lignocelluloses from the SL of an NSSC process is proposed and the effectiveness of this process is evaluated on industrially produced SL. The results showed that under the optimal conditions of pH 6, 30°C and 15mg/g poly ethylene imine (PEI) concentration in the SL, a maximum of 37% lignin and 37% hemicelluloses could be removed from SL. Alternatively, the dual system of poly diallyldimethyl ammonium chloride (PDADMAC) and PEI (7.5mg/g each) was evaluated in removing lignocelluloses from the SL; and the results showed that lignin and hemicellulose removals were improved to 47% and 50%, respectively. The turbidity and chemical oxygen demand (COD) of SL, as well as the elemental analysis of generated flocs were also assessed in this work.
Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1.
Thomas
T
Sitter
Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1.
Farshad
F
Oveissi
Chemical Engineering Department, Lakehead University, Thunder Bay, Ontario, Canada P7B 5E1. Electronic address: pfatehi@lakeheadu.ca.
Pedram
P
Fatehi
D000498:Allyl Compounds / Q000737:chemistry*; D000818:Animals; D057919:Biological Oxygen Demand Analysis; D005427:Flocculation; D007220:Industrial Waste; D008031:Lignin / Q000302:isolation & purification*; D011094:Polyethyleneimine / Q000737:chemistry*; D011200:Poultry; D000644:Quaternary Ammonium Compounds / Q000737:chemistry*; D013447:Sulfites / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*
D000498:Allyl Compounds; D007220:Industrial Waste; D000644:Quaternary Ammonium Compounds; D013447:Sulfites; C036909:lignocellulose; C508190:diallyldimethylammonium chloride; D011094:Polyethyleneimine; D008031:Lignin
Biorefinery; Flocculation; NSSC process; PEI; Spent liquor