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

Pending Publication Date: 2020-07-31
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, in view of the problems of poor microbial adhesion in activated sludge, easy oxidation of sulfide, low denitrification efficiency, and high cost, t

Method used

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  • Method and device for treating nitrate nitrogen in high-concentration sulfate wastewater
  • Method and device for treating nitrate nitrogen in high-concentration sulfate wastewater
  • Method and device for treating nitrate nitrogen in high-concentration sulfate wastewater

Examples

Experimental program
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Example Embodiment

[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...

Example Embodiment

[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...

Example Embodiment

[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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Abstract

The invention relates to the field of water treatment, and discloses a method and a device for treating nitrate nitrogen in high-concentration sulfate wastewater; the method comprises the following steps: (1) inoculating first activated sludge in a reaction zone of a first UASB unit, adding a first suspended ball filler, and starting the first UASB unit; inoculating second activated sludge into areaction zone of a second UASB unit, adding a second suspended ball filler, and starting the second UASB unit; (2) connecting the started first UASB unit with the started second UASB unit in series, allowing the high-concentration sulfate wastewater to enter the first UASB unit, keeping the water temperature at 30-35 DEG C to carry out a sulfate reduction denitrification reaction, allowing the obtained effluent directly to enter the second UASB unit, and keeping the water temperature at 30-35 DEG C to carry out a denitrification desulfurization reaction. By adopting the method and the device for treatment, reasonable addition of the suspended ball filler is beneficial to microorganism attachment, and the denitrification effect is effectively enhanced; heating is uniform, so that the reaction is efficiently carried out; an intermediate water tank is not additionally arranged between reactors in the first UASB unit and the second UASB unit, so that oxidation of sulfide can be prevented,and the sulfate removal rate is effectively increased; and the removal rate of nitrate nitrogen in the high-concentration sulfate wastewater reaches 98% or above.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method and device for treating nitrate nitrogen in high-concentration sulfate wastewater. Background technique [0002] Chemical, pharmaceutical, metal processing, mining and other industrial sectors to remove SO from flue gas with certain solid desulfurizers 2 When the solid desulfurizer regeneration waste liquid contains high concentration of sulfate. The main feature of this type of wastewater is that it contains a large amount of inorganic salt ions such as nitrate ions and sulfate ions, and the total salinity can reach 80,000mg / L, while the content of effective carbon sources is low, showing the remarkable characteristics of low carbon sources and high salinity. The national and local governments have extremely strict requirements on water pollution prevention and control, and have successively formulated a series of laws, regulations and standards to strictly control the e...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F101/10C02F101/16C02F101/30
CPCC02F3/2846C02F2101/101C02F2101/30C02F2101/163
Inventor 张会宁节梦瑞张科锋王汉青季必霄袁鑫桂鑫蕊
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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