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Study on Nitrogen Oxides Removal in Compound Bio-Filter

Author: PangDeHong
Tutor: LiuZhiFei
School: Qingdao Technological University
Course: Environmental Engineering
Keywords: Composite biofilter Nitrogen oxides Biological nitrification Activated Carbon Sawdust
CLC: X701
Type: Master's thesis
Year: 2010
Downloads: 30
Quote: 0
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Abstract


Nitrogen oxides (NO_X) is one of the major pollutants that cause air pollution and the large number of emissions of NO_X be human health and ecological environment poses a great threat to the development of highly efficient and low-energy NO_X gas treatment technology has a very important practical significance. Biological method is new processing technology developed in recent years, has become a hot topic of concern in the current researchers because of its simple technology and equipment, less investment, low power consumption and small secondary pollution. At present, domestic and foreign rarely composite biofilter handling NO_X exhaust. Nitration mechanism, the test composite biofilter biological trickling filter and biological filtration tower series handle NO_X exhaust investigated composite biofilter nitrification the purification NO_X exhaust effect. The tests were activated charcoal, wood chips and multi-faceted hollow ball mixed filler as biological trickling filter biological filtration tower packing, ammonium chloride as the nitrogen source activated sludge of the municipal sewage treatment plant cultured, and then on to get the The nitrification bacteria were hang film and Gas domesticated. By studying the state of the composite biofilter at different into the gas inlet concentration, spray volume and packing layer height removal effect of NO_X, resulting in the best composite biofilter operating conditions, and the effects of the system shock load capability and the packing pressure drop changes with time. The study showed that: (1) at the inlet concentration of 604.5mg / m ~ 3, the spray amount of 1.2L / h, the intake air amount 0.6m ~ 3 / h (empty bed residence time of about 103.7s), the system purification effect of NO_X best filler removal loading up to 29.66g / (m 3 · h); (2) biological trickling filter tower and biological filtration tower packing layer height are 75cm but NO_X removal of major 0 ~ 50cm filler segment within biological trickling filter and biological filtration tower, that is, when the composite biofilter filler layer height 100cm, purifying effect ideal economy; (3) The test device sudden dynamic load larger changes, back to normal in about 7h, its ability to shock load; (4) filler layer pressure drop increase with time, but the biological filtration tower drop significantly larger than the rate of change of the biological trickling biofilter, in order to make the device stable operation, you should try to keep the packing pressure drop stable. This test shows that utilize composite the biological filter tower processing NO_X exhaust is feasible, and provides an effective way for to solve NO_X pollution, with certain environmental and economic benefits.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization
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