Method and device for treating nitrate nitrogen in high-concentration sulfate wastewater
A technology of nitrate nitrogen and treatment method, applied in the field of water treatment, can solve the problems of low denitrification efficiency, easy oxidation of sulfides and high cost, and achieve the effects of strengthening denitrification effect, preventing oxidation and improving removal rate
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[0046] Example 1
[0047] (1) Inoculate the remaining activated sludge from the secondary settling tank of the municipal sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge occupies 2 / 3 of the volume of the reaction zone, and the sludge concentration is maintained at 5500 mg / L, The filling ratio of the suspended ball filler in the reaction zone is 30%; the artificial water distribution with a potassium nitrate concentration of 25 mg / L, a sulfate concentration (prepared with anhydrous sodium sulfate) of 330 mg / L, and a COD / N of 110 is used as the inlet water. The inlet water from the inlet water tank (1) through the first inlet pump (1.2) and the first inlet (2.1) into the first UASB reactor (2) for sulfate reduction and denitrification reaction, the backflow of the reactor and the inlet The ratio of water volume is 28:1, hydraulic retention time is 22h, sodium bicarbonate is used in the reactor to adjust the pH to 6.5-8.5, and the carbon source i...
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[0050] Example 2
[0051] (1) Inoculate the remaining activated sludge from the secondary sedimentation tank of the municipal sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge occupies 1 / 3 of the volume of the reaction zone, and the sludge concentration is maintained at 5000 mg / L, The filling ratio of the suspended ball filler in the reaction zone is 40%; the artificial water distribution with a potassium nitrate concentration of 20 mg / L, a sulfate concentration (prepared with anhydrous sodium sulfate) of 300 mg / L, and a COD / N of 100 is used as the inlet water. The inlet water from the inlet water tank (1) through the first inlet pump (1.2) and the first inlet (2.1) into the first UASB reactor (2) for sulfate reduction and denitrification reaction, the backflow of the reactor and the inlet The ratio of water volume is 25:1, the hydraulic retention time is 20h, sodium bicarbonate is used in the reactor to adjust the pH to 6.5-8.5, the carbon sou...
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[0054] Example 3
[0055] (1) Inoculate the remaining activated sludge from the secondary settling tank of the municipal sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge occupies 4 / 5 of the volume of the reaction zone, and the sludge concentration is maintained at 6000 mg / L, The filling ratio of the suspended ball filler in the reaction zone is 20%; the artificial water distribution with a potassium nitrate concentration of 30 mg / L, a sulfate concentration (prepared with anhydrous sodium sulfate) of 350 mg / L, and a COD / N of 120 is used as the inlet water. The inlet water from the inlet water tank (1) through the first inlet pump (1.2) and the first inlet (2.1) into the first UASB reactor (2) for sulfate reduction and denitrification reaction, the backflow of the reactor and the inlet The ratio of water volume is 30:1, hydraulic retention time is 24h, sodium bicarbonate is used in the reactor to adjust the pH to 6.5-8.5, the carbon source is gl...
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