Bacterial strain capable of rapidly degrading nitrogen in sewage, and applications of bacterial strain
A bacterial strain and sewage treatment technology, applied in the field of environmental engineering, can solve problems such as difficult nitrogen treatment, achieve broad application prospects, and shorten the start-up time
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[0039] Example 1: Screening of strains
[0040] The strain of the present invention adopts a plate dilution separation method to separate and screen strains that can degrade nitrogen under aerobic conditions from the sludge flora.
[0041] The separation and screening methods are as follows:
[0042] 1. Dilution of mixed strains: take the bottom sludge from Zibo Boshan Sewage Treatment Plant, dissolve the sludge in deionized water (1g sludge is dissolved in 200ml deionized water), and perform gradient dilution of strains .
[0043] 2. Preparation of industrial sewage samples: Take industrial sewage from Boshan Sewage Treatment Plant in Zibo City (total nitrogen content is about 100mg / L), and adjust its pH to about 7 after filtering impurities. Fill it in a triangular flask (specification: 250ml) 150ml, add 0.48g glucose (carbon to nitrogen molar ratio: 10), sterilize at 115°C for 30min.
[0044] 3. Preliminary screening of bacterial species: take 20 microliters of the bacterial soluti...
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[0050] Example 2: Detection of aerobic denitrification performance of Paracoccus denitrificans DYTN-1
[0051] Prepare simulated sewage (glucose 5.3g, NaNO 3 1.5g, NaCl 3g, KH 2 PO 4 1.0g, FeCl 2 ·H 2 O 0.5g, CaCl 2 ·H 2 O 0.2g, MgSO 4 1.0g, H 2 O 1.0L, pH7.0~7.5), the initial concentration of nitrate nitrogen is 247mg / L, and the molar ratio of carbon to nitrogen is 10. Pick 1 ring of Paracoccus denitrificans DYTN-1 from the slope and inoculate it in 50ml nutrient broth liquid medium (peptone 10.0g, beef extract 3.0g, sodium chloride 5.0g, agar 15.0g, distilled water 1L, pH= 7.0) In a 250ml Erlenmeyer flask, culture at 30°C, 200rpm shaking for 36h, centrifuge at 5000rpm for 10min to discard the supernatant, and collect the bacteria. Resuspend the bacteria with sterilized simulated sewage and put it in a 250ml Erlenmeyer flask containing 150ml simulated sewage. Ferment for 36h under the conditions of shaking culture at a temperature of 30℃ and 200rpm. The removal rate of nitrate n...
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[0052] Example 3: Detection of heterotrophic nitrification-aerobic denitrification performance of Paracoccus denitrificans DYTN-1
[0053] Prepare simulated wastewater 1 (glucose 5.9g, (NH 4 ) 2 SO 4 1.25g, NaCl 3g, KH 2 PO 4 1.0g, FeCl 2 ·H 2 O0.5g, CaCl 2 ·H 2 O 0.2g, MgSO 4 1.0g, H 2 O 1.0L, pH 7.0~7.5), the initial concentration of nitrate nitrogen is 265mg / L, and the molar ratio of carbon to nitrogen is 10. Pick 1 ring of Paracoccus denitrificans DYTN-1 from the slope and inoculate it in 50ml nutrient broth liquid medium (peptone 10.0g, beef extract 3.0g, sodium chloride 5.0g, agar 15.0g, distilled water 1L, pH= 7.0) In a 250ml Erlenmeyer flask, culture at 30°C, 200rpm shaking for 36h, centrifuge at 5000rpm for 10min to discard the supernatant, and collect the bacteria. Resuspend the bacteria with sterilized simulated sewage 1 and put them in a 250ml Erlenmeyer flask containing 150ml simulated sewage 1, and ferment for 36h under the condition of shaking culture at 30℃ and 20...
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