TECHNOLOGY FOCUS - BIOLOGY - Preparation (Claimed): Preparation of bacteria Pandoraea sp. yellow-2CGMCC No.5284 comprises adding first nitrite bacteria culture solution in an underbrush sequencing batch reactor, inoculating sludge of the sewage treatment plant in the first type nitrite bacteria culture solution to continuously cultivate for 4-6 days at 8-12 degrees C, taking out the liquid supernatant and adding the second nitrite bacteria culture solution to continuously cultivate for 4-6 days at 8-12 degrees C, gathering and acclimatizing the low-temperature bacteria, adding 10ml of obtained sludge in a 250 ml conical flask with 90 ml sterile purified water and 20-30 glass beads, vibrating for 10-30 minutes to make the bacterial cell completely release into the liquid supernatant, standing for 20-40 minutes, adding 1 ml liquid supernatant to the test tube holding 9 ml sterile distilled water to get 0.01 bacteria suspension, serial diluting, choosing the bacteria suspension of 10-5 and 10-8, inoculating 1 ml bacteria suspension to the nitrous acid bacteria solid medium, making three parallel samples for each dilution degree and then numbering, culturing for 2-3 weeks at 10 degrees C in aerobic condition, selecting big single bacterial colony of different forms from the nitrite bacteria solid medium plate, once again streaking and separating the nitrite bacteria solid medium plate, where the bacterial colonies are simple and of similar size, and naming the single colony as yellow-2, which is identified as the bacteria Pandoraea sp.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The first nitrite bacteria culture solution comprises 0.0764 g of ammonium chloride, 2 g of sodium acetate, 0.05 g of magnesium sulfate heptahydrate, 0.2 g of potassium monohydrogen phosphate, 0.12g of sodium chloride, 0.01 g of manganese sulfate monohydrate, 0.01 g of ferrous sulfate and 1000 ml of distilled water. The second nitrite bacteria culture solution comprises 0.191 g of ammonium chloride, 2 g of sodium acetate, 0.05 g of magnesium sulfate heptahydrate, 0.2 g of potassium monohydrogen phosphate, 0.12 g of sodium chloride, 0.01 g of manganese sulfate monohydrate, 0.01 g of ferrous sulfate and 1000 ml of distilled water. The third nitrite bacteria culture solution comprises 0.382 g of ammonium chloride, 2 g of sodium acetate, 0.05 g of magnesium sulfate heptahydrate, 0.2 g of potassium monohydrogen phosphate, 0.12 g of sodium chloride, 0.01 g of manganese sulfate monohydrate, 0.01 g of ferrous sulfate and 100 ml of distilled water. The nitrite bacteria solid medium comprises 0.0764 g of ammonium chloride, 2 g of sodium acetate, 0.05 g of magnesium sulfate heptahydrate, 0.2 g of potassium monohydrogen phosphate, 0.12 g of sodium chloride, 0.01 g of manganese sulfate monohydrate, 0.01 g of ferrous sulfate and 1000 ml of distilled water.