Performance evaluation of biofilters packed with carbon foam and lava for nitric oxide removal.
Long-term (>8 months) results of nitric oxide (NO) removal in biofilters, respectively, packed with lava and two different pore sizes of carbon foam (24 pores/cm (PPC) and 18 PPC) were measured. During the operation, NO removal efficiency, pressure drops, pH dependence and removal profile were evaluated. NO removal efficiencies were above 93.8%, 79.4% and 58.6% in the biofilters, respectively, packed with 24 PPC carbon foam, 18 PPC carbon foam and lava. The lava-packed biofilter demonstrated higher buffer capacity for change of pH. However, with sufficient nutrient and buffer solution feeding, the biofilter packed with carbon foam showed a higher NO removal efficiency. The pressure drops of the biofilter packed with carbon foam did not exceed 11 mm H(2)O/m. The low-pressure drops made it possible by using carbon foam as packing to conveniently prevent the clogging and channeling problems associated with conventional biofilter operations.
Chen
Jianmeng
J
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China. jchen@zjut.edu.cn
Wu
Chengqiang
C
Wang
Jiade
J
Ma
Jianfeng
J
D000327:Adsorption; D000393:Air Pollutants; D000397:Air Pollution; D002244:Carbon / Q000737:chemistry*; D002623:Chemistry Techniques, Analytical / Q000379:methods; D005069:Evaluation Studies as Topic; D005374:Filtration / Q000379:methods*; D015386:Hazardous Substances; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D009569:Nitric Oxide / Q000737:chemistry*; D009573:Nitrites; D014865:Waste Disposal, Fluid / Q000379:methods*
D000393:Air Pollutants; D015386:Hazardous Substances; D009573:Nitrites; D009569:Nitric Oxide; D002244:Carbon