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A device for removing nitrate nitrogen in resin desorption liquid and its application process

A technology of desorption liquid and nitrate nitrogen, which is applied in water/sewage multi-stage treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc. Small area, compact device structure, chemical oxygen demand reduction effect

Active Publication Date: 2020-08-04
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in the sewage denitrification treatment process, the biological denitrification method is mainly used, and the denitrification reaction requires the dissolved oxygen concentration in the wastewater to be lower than 0.5mg / L, which puts forward requirements on the water quality of the influent; the current removal of wastewater For the nitrate nitrogen device, each reactor is separated and connected by pipes. This pipe-connected device for removing nitrate nitrogen in wastewater not only occupies a large area, but also wastes a lot of resources.

Method used

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  • A device for removing nitrate nitrogen in resin desorption liquid and its application process
  • A device for removing nitrate nitrogen in resin desorption liquid and its application process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 As shown, a device for removing nitrate nitrogen in the resin desorption liquid, including a reactor, an aeration device 11, a water inlet tank 1 and an ozone dosing device 4, is characterized in that: the reactor is a concentric cylindrical structure, The inner layer of the reactor of the concentric cylindrical structure is an ozone contact reactor 3, and the outer layer is an anoxic reactor 8 and a sludge settler 9 spaced apart, and the bottom of the anoxic reactor 8 and the sludge settler 9 The upper end of the ozone contact reactor 3 is provided with a water outlet 7 communicating with the anoxic reactor 8, and the lower end of the ozone contact reactor 8 is filled with an ozone reaction catalytic packing 5, and the ozone contact reactor 3 is connected through a connecting pipe One 13 is connected with the water inlet tank 1, and the ozone contact reactor 3 is connected with the ozone dosing device 4 through the connection pipe two 14, and the devic...

Embodiment 2

[0041] Utilize the device among the embodiment 1 to remove the technology of nitrate nitrogen in the resin desorption liquid as follows:

[0042]Mix 10L wastewater with influent COD of 1000mg / L and nitrate nitrogen concentration of 100mg / L and ozone from the ozone dosing device in the lower part of the ozone contact reactor, and then enter the 12.5L ozone contact reactor through the aeration device , under the condition of pH between 4 and 5, after a hydraulic retention time of 3 hours, the wastewater overflows from the outlet at the upper end of the ozone contact reactor to the anoxic reactor with a volume of 16.5L. In the anoxic reactor, The denitrifying bacteria denitrify with the wastewater in the anoxic reactor under the condition of pH between 7 and 8. After 20 hours of hydraulic retention time, they enter the sludge settler for precipitation, and the settled wastewater can be discharged. In the present embodiment, the COD value of the treated wastewater is reduced to 19...

Embodiment 3

[0044] Utilize the device among the embodiment 1 to remove the technology of nitrate nitrogen in the resin desorption liquid as follows:

[0045] Mix the 12L wastewater with an average influent COD of 2000mg / L and a nitrate nitrogen concentration of 300mg / L and the ozone from the ozone dosing device in the lower part of the ozone contact reactor, and then enter the ozone contact reaction with a volume of 12.5L through the aeration device In the reactor, under the condition of pH between 4 and 5, after 2 hours of hydraulic retention time, the wastewater overflows from the water outlet at the upper end of the ozone contact reactor to the anoxic reactor with a volume of 16.5L. In the reactor, the denitrifying bacteria will denitrify with the wastewater from the anoxic reactor under the condition of pH between 7 and 8. After 15 hours of hydraulic retention time, they enter the sludge settler for precipitation, and the wastewater after precipitation can be emission. In the present...

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Abstract

The invention discloses a device for removing nitrate nitrogen in a resin desorption solution and an application process of the device. The device comprises a reactor, an aeration device, a water inflow box and an ozone adding device. An ozone contact reactor is arranged on the inner layer of the reactor of a concentric cylinder structure, and an anoxic reactor and a sludge precipitator which are spaced are arranged on the outer layer of the reactor. The anoxic reactor is communicated with the bottom of the sludge precipitator, a water outlet communicated with the anoxic reactor is formed in the upper end of the ozone contact reactor, the lower end of the ozone contact reactor is filled with ozone reaction catalytic filler, the ozone contact reactor is connected with the water inflow box through a first connecting pipeline, and the ozone contact reactor is connected with the ozone adding device through a second connecting pipeline. The device further comprises an ozone collecting device, a gas inlet of the ozone collecting device is communicated with the top end of the ozone contact reactor, and a gas outlet of the ozone collecting device is connected with the ozone adding device through a third connecting pipeline provided with a circulating pump. The device is compact in structure, small in occupied area, high in efficiency and convenient to operate.

Description

technical field [0001] The invention relates to the field of wastewater biochemical treatment equipment, in particular to a device for removing nitrate nitrogen in resin desorption liquid and an application process thereof. Background technique [0002] Among the advanced treatment technologies of biochemical tail water, resin adsorption technology is the most widely used advanced treatment technology. Resin technology has the advantages of large adsorption capacity, good treatment effect, stable reuse, etc. However, the composition of the desorption liquid produced after wastewater treatment with resin is quite complex, with high salinity, high content of organic matter, high concentration of nitrate nitrogen, deep color, and difficult biodegradation. The desorption solution is difficult to handle, which greatly limits the further popularization and application of the magnetic resin. Therefore, it is urgent to find an efficient and economical treatment method. [0003] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
CPCC02F1/52C02F1/78C02F3/28C02F3/34C02F9/00
Inventor 双陈冬胡海兰刘福强曲艳南姜笔存
Owner NANJING UNIV
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