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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

AI Technical Summary

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, there is an urgent need in this field to develop a treatment method for high-efficiency microbial denitrification of high-concentration sulfate wastewater and device

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
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Inoculate the remaining activated sludge of the secondary settling tank of the urban sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge accounts for 2 / 3 of the reaction zone volume, and keeps the sludge concentration at 5500mg / L, The filling ratio of the suspension ball filler in the reaction area is 30%; the artificial water 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 influent. The incoming water enters the first UASB reactor (2) from the incoming water tank (1) through the first water inlet pump (1.2) and the first water inlet (2.1) to carry out the sulfate reduction and denitrification reaction. The ratio of water volume is 28:1, the 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 is glucose COD Cr The concentration is 2800mg / L, the di...

Embodiment 2

[0051] (1) Inoculate the remaining activated sludge of the secondary settling tank of the urban sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge accounts for 1 / 3 of the reaction zone volume, and keeps the sludge concentration at 5000mg / L, The filling ratio of the suspension ball filler in the reaction area is 40%; the artificial water with a potassium nitrate concentration of 20mg / L, a sulfate concentration (prepared with anhydrous sodium sulfate) of 300mg / L, and a COD / N of 100 is used as the influent. The incoming water enters the first UASB reactor (2) from the incoming water tank (1) through the first water inlet pump (1.2) and the first water inlet (2.1) to carry out the sulfate reduction and denitrification reaction. 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 source is glucose, COD Cr Concentration is 2000mg / L, and dissolved o...

Embodiment 3

[0055] (1) Inoculate the remaining activated sludge of the secondary settling tank of the urban sewage treatment plant in the reaction zone of the first UASB reactor (2), the sludge accounts for 4 / 5 of the reaction zone volume, and keeps the sludge concentration at 6000mg / L, The filling ratio of the suspension ball filler in the reaction area is 20%; the artificial water distribution with a potassium nitrate concentration of 30mg / L, a sulfate concentration (prepared with anhydrous sodium sulfate) of 350mg / L, and a COD / N of 120 is used as the influent. The incoming water enters the first UASB reactor (2) from the incoming water tank (1) through the first water inlet pump (1.2) and the first water inlet (2.1) to carry out the sulfate reduction and denitrification reaction. The ratio of water volume is 30:1, the 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 glucose, COD Cr Concentration is 3600mg / L, an...

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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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