Treatment of acetone waste gases using slurry-phase airlift embedded with polyacrylamide-entrapped cell beads.
Acetone is the most common chemical used in the Hsin-chu Science Park in Taiwan. The three-phase airlift bioreactor was designed to absorb acetone into the 39 L of medium solution and then degraded by 2-L polyacrylamide (PAA)-entrapped Thiosphaera pantotropha cell beads. The airlift medium was successfully regenerated and circulated for more than 5 months. The elimination capacity of 350-part per million (ppm) acetone at 10 L x min(-1) was 258.4 g x m(-3) hr(-1) (160.4 g-C x m(-3) hr(-1)) with 100% removal efficiency in Stage II, higher than previously reported biofiltration results. The maximum chemical oxygen demand:nitrogen ratio of 100:2.9 is achieved, and a balanced nutrient state was indicated by the change in redox potential. The pH of the system was maintained at neutral because of the strong buffer agent added to the medium (final buffer intensity, beta = 1.18 x 10(-2) M). The PAA-entrapped cell beads could also provide a good barrier for high salinity gradient environment and the inoculum source to maintain steady operation of the system.
Department of Civil Engineering, Chung Hua University, Hsinchu City, Taiwan, Republic of China. sjh@chu.edu.tw
Sz-Chwun John
SC
Hwang
Yun-Huin
YH
Lin
Ku Shu
KS
Huang
Jyuhn-Yih
JY
Lyuu
Cheng-Ting
CT
Hou
Hsin-Hua
HH
Chen
Sin-Yi
SY
He
D000096:Acetone / Q000737:chemistry*; D000180:Acrylic Resins / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry*; D000397:Air Pollution / Q000517:prevention & control; D005740:Gases / Q000737:chemistry*; D007220:Industrial Waste; D010084:Oxidation-Reduction; D013997:Time Factors; D000099166:Polyacrylamides
D000096:Acetone; D000180:Acrylic Resins; D000393:Air Pollutants; D005740:Gases; D007220:Industrial Waste; D000099166:Polyacrylamides