1. Alkali pretreatment enhances biogas production in the anaerobic digestion of pulp and paper sludge
- Author
-
Lin, Yunqin, Wang, Dehan, Wu, Shaoquan, and Wang, Chunmin
- Subjects
- *
ALKALIES , *BIOGAS , *MANUFACTURING processes , *WOOD-pulp , *PAPER , *INDUSTRIAL wastes , *METHANE , *INDUSTRIAL productivity , *SODIUM hydroxide , *SOLUBILIZATION - Abstract
Abstract: The objective of this research was to develop an alkali pretreatment process prior to anaerobic digestion (AD) of pulp and paper sludge (PPS) to improve the methane productivity. Different concentrations of sodium hydroxide solution were used to pretreat PPS, and then followed by AD of PPS and monosodium glutamate waste liquor (MGWL). Laboratory-scale experiments were carried out in completely mixed bioreactors, 1L capacity with 700mL worked. Optimal amount of sodium hydroxide for organics solubilization in the step of pretreatment was 8g NaOH/100g TSsludge. Under this condition, the PPS flocs structure was well disrupted resulting in the void rate and fiber size decreased after pretreatment, and SCOD increased up to 83% as well as the peak value of VFA concentration attained 1040mgaceticacid/L during AD. The AD efficiency of PPS with and without pretreatment was evaluated. The highest methane yield under optimal pretreatment condition was 0.32m3 CH4/kgVSremoval, 183.5% of the control. The results indicated that alkali/NaOH pretreatment could be an effective method for improving methane yield with PPS. [Copyright &y& Elsevier]
- Published
- 2009
- Full Text
- View/download PDF