Biological filtering method for converting nitrogen oxide gas into nitrogen under aerobic environment
A gas conversion and biological filtration technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of reduced NO removal efficiency, high energy consumption, difficult film hanging, etc., to improve regeneration speed and activity. , The effect of simple process operation and reduced processing cost
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Embodiment 1
[0025] Artificially synthesized high-concentration nitrogen oxide exhaust gas: dilution gas N 2 , NO 0.80mg / l, O 2 3%, CO 2 18%. Dimensions of biological filter bed: inner diameter 8cm, length 50cm, upper and lower sections of 5cm long buffer zone. The filler is made of lightweight bioceramic, specification: Φ6mm, specific gravity 1.0±0.2, porosity 0.55, specific surface area 200m 2 / m 3 . The composite bacteria are inoculated on the filler, and the film formation is completed after two weeks of circulation. The main components and proportions of the circulating fluid are as follows: glucose 50mg / l, NaCl 50mg / l, phosphate buffer pH=6.8~7.2, FeCl 2 4H 2 O 20mg / l, MgSO 4 ·7H 2 O 200mg / l, anhydrous CaCl 2 21.8mg / l, add 10ml of trace element solution for every liter of nutrient solution. The exhaust gas is first introduced from the bottom of the scrubber, collected at the top and then passed to the bottom of the biological filter bed. The circulating liquid is sprayed...
Embodiment 2
[0029] Synthetic waste gas: diluent gas N 2 , NO 0.15mg / l, O 2 8%, CO 2 18%. The size of the biological filter bed: inner diameter 20cm, length 200cm. The filler is made of lightweight bioceramics, specification: Φ6mm, specific gravity 1.0±0.2, porosity 0.55, specific surface area 300m 2 / m 3 . The packing is stacked in two layers, the lower layer is 82cm high, the upper layer is 64cm high, and a distributor is added in the middle. Inoculate the filler with the denitrification bacteria after acclimatization and cultivation, and the film formation is completed after two weeks of circulation. Circulating fluid is added simultaneously from the top of the biological filter bed and between the redistributor, and the flow rates are 6.8l / h and 3.2l / h respectively. After the circulating fluid passes through the biological filter bed, it is recovered to the denitrifying bacteria active regeneration device; the denitrifying bacteria active regeneration device maintains an atmos...
Embodiment 3
[0031] The main components and average concentration of exhaust gas from a small boiler after desulfurization are: N 2 80%, NO0.25mg / l, O 2 8.1%, CO 2 11.2%, SO 2 0.06mg / l. The average volume flow rate of exhaust gas is 1893.4m 3 / h. Adopt concrete implementation of the present invention as follows:
[0032]The first step is to determine the size of the biological filter bed according to the amount of gas to be treated and the concentration of nitrogen oxides in the exhaust gas. Since the concentration of NO in the exhaust gas is not high, the design residence time can be about 30s. According to the site's geographical environment and other factors, the inner diameter is 2m, the length is 10m, and the effective volume is about 31.4m 3 .
[0033] The second step is to choose the filler. Lightweight bioceramics are selected, specifications: Φ5mm, specific gravity 1.0±0.2, porosity 0.55, specific surface area 250m 2 / m 3 . The hanging film adopts the method of mix...
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