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.
College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China. jchen@zjut.edu.cn
Jianmeng
J
Chen
Chengqiang
C
Wu
Jiade
J
Wang
Jianfeng
J
Ma
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