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Baffling type ammonia-nitrogen wastewater advanced denitrification device and method

A technology of ammonia nitrogen wastewater and deep denitrification, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc. problem, to achieve the effect of enhancing the production efficiency of effective chlorine, the efficient denitrification reaction, and the prevention of short-circuit current.

Pending Publication Date: 2019-08-02
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, some high-ammonia-nitrogen wastewater, such as aquaculture wastewater, cannot meet the discharge requirements of ammonia nitrogen through traditional sewage treatment methods, and it is difficult for two-dimensional electrolysis reactors to meet projects with large water volumes.

Method used

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  • Baffling type ammonia-nitrogen wastewater advanced denitrification device and method
  • Baffling type ammonia-nitrogen wastewater advanced denitrification device and method
  • Baffling type ammonia-nitrogen wastewater advanced denitrification device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0039] The wastewater used is the effluent of high ammonia nitrogen wastewater from a pig farm treated by traditional biochemical process, as shown in Table 1, the ammonia nitrogen content of the wastewater is 170mg / L, the chloride ion content is low, and pH=7.2.

[0040] Use an electrochlorination device to denitrify it. The plate of the electrolysis reactor is a single-stage structure. Columnar activated carbon and glass particles are mixed as three-dimensional particle fillers. The electrolysis voltage U=25v, and the current density of the positive and negative plates is 35mA / cm 2 , add sodium chloride, and adjust the molar ratio of ammonia nitrogen to chloride ions to be 1:28. During the electrolysis process, the concentration of ammonia nitrogen in the wastewater changes as image 3 Shown, when reacting 80min, the removal rate of ammonia nitrogen is as high as 98%.

[0041] Table 1 Indicators of wastewater to be treated

[0042] Element Ammonia nitrogen Cl ...

Embodiment 2

[0044] Adopt the waste water and device among the embodiment 1, set the current density of positive and negative plates to be 20mA / cm 2 , and add sodium chloride to adjust the molar ratio of ammonia nitrogen to chloride ions to be 1:22. Other reaction conditions are the same. The experimental results show that the removal rate of ammonia nitrogen reaches 98% in 90 minutes.

Embodiment 3

[0046] Adopt the waste water and device among the embodiment 1, set the current density of positive and negative plates to be 50mA / cm 2 , and add sodium chloride to adjust the molar ratio of ammonia nitrogen to chloride ions to be 1:33. Other reaction conditions are the same. The experimental results show that the removal rate of ammonia nitrogen can reach 99% in 70 minutes.

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Abstract

The invention discloses a baffling type ammonia-nitrogen wastewater advanced denitrification device and method. The device comprises a chlorine salt adjusting tank, an electrochlorination denitrification reaction tank and a pH adjusting tank which are connected sequentially, wherein chlorine salt can be added to the chlorine salt adjusting tank as required to adjust the concentration of chloride ions; baffling components are arranged in the electrochlorination denitrification reaction tank, the wastewater staying time can be prolonged, meanwhile, DSA polar plate groups are arranged, gaps amongpolar plates are filled with 3D particle electrodes, and the available chlorine production efficiency of an electrochlorination reactor can be enhanced. According to the electrochlorination advanceddenitrification device, by use of active chlorine produced by electrochlorination, ammonia nitrogen is finally oxidized into nitrogen to be removed, and no ammonium salt, nitrate or other byproducts can be produced; the continuous flow denitrification efficacy can be enhanced through the 3D electrodes and the baffling design of the electrochlorination denitrification reaction tank, advanced denitrification is realized, the operation is simple, and the problem of high ammonia-nitrogen content of effluent from the tail end of wastewater treatment can be solved.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a baffle type ammonia nitrogen wastewater deep denitrification device and method. Background technique [0002] With the introduction of relevant policies on environmental protection in my country, the prevention and control of water environmental pollution has become an important aspect. The supervision of wastewater from animal husbandry, meat processing, and food production has been strengthened. The concentration of ammonia nitrogen in this type of wastewater is relatively high. After traditional It is difficult to meet the discharge requirements after process treatment, and the concentration of ammonia nitrogen in the effluent even exceeds the discharge requirements by tens or hundreds of times. The removal of ammonia nitrogen by electrochlorination is a method to generate hypochlorite or hypochlorous acid (available chlorine) through the interaction of electrolysi...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/16
CPCC02F1/66C02F1/4674C02F2101/16
Inventor 戴捷姚梦汪冬芳易俊
Owner YANGTZE UNIVERSITY
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