Alkali pretreatment enhances biogas production in the anaerobic digestion of pulp and paper sludge

作者：Lin Yunqin^*; Wang Dehan; Wu Shaoquan; Wang Chunmin

来源：Journal of Hazardous Materials, 2009, 170(1): 366-373.

DOI：10.1016/j.jhazmat.2009.04.086

• Pulp and paper sludge
• Anaerobic digestion
• Methane production
• Alkali pretreatment
• NaOH

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, 1 L capacity with 700mL. worked. Optimal amount of sodium hydroxide for organics solubilization in the step of pretreatment was 8 g NaOH/100g TSstudge. 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 VIA concentration attained 1040 mg acetic acid/L. during AD. The AD efficiency of PPS with and without pretreatment was evaluated. The highest methane yield under optimal pretreatment condition was 0.32 m(3) CH4/kg VSremoval, 183.5% of the control. The results indicated that alkali/NaOH pretreatment could be an effective method for improving methane yield with PPS.

• 出版日期2009-10-15
• 单位华南农业大学