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Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor

An electrolytic treatment, ammonia nitrogen technology, applied in water/sewage treatment, water treatment parameter control, water/sludge/sewage treatment, etc., can solve problems such as difficulty in suppressing the generation of nitric acid, increase in operating cost, decrease in pH value, etc. Achieve the effect of inhibiting the formation of nitric acid, improving the efficiency of ammonia decomposition, and inhibiting the formation of nitric acid

Active Publication Date: 2011-01-26
MITSUBISHI HEAVY IND ENVIRONMENTAL & CHEM ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the method disclosed in Patent Document 1 has the following problems: it has almost no buffer capacity for the target wastewater, and a large amount of alkaline agent is required to adjust the pH to 8 to 12, resulting in increased operating costs
[0011] Furthermore, the existing electrolysis method has the problem that H + , causing a decrease in pH value, so chlorine gas volatilizes, and then the concentration of chloride ions in wastewater decreases, and the efficiency of chlorine generation decreases
Therefore, as disclosed in Patent Document 1, under the condition of having chloride ions, the pH value is controlled within the range of 8 to 12, and electrolytic treatment is carried out to suppress the reduction of the concentration of chloride ions, but it is difficult to suppress the generation of nitric acid, so it is not yet available. The reduction in current efficiency cannot be improved, which is the current situation

Method used

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  • Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor
  • Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor
  • Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0071] The treatment device of the present embodiment 1 shown in Fig. 1 comprises: deposit the raw water tank 10 that contains the waste water 20 of ammoniacal nitrogen, import the circulation adjustment tank 11 of the waste water 20 that flows out by this raw water tank, and import by circulation pump 13 from The electrolytic tank 12 for the conditioning solution of the circulation adjustment tank 11 ; and the electrolytic treatment solution treated in the electrolytic tank 12 is circulated in the circulation adjustment tank 11 .

[0072] The circulation adjusting tank 11 has a pH adjusting device, and is adjusted by adding a pH adjusting agent 21 so that the pH value of the treatment liquid in the tank is 5 or more and less than 8. The pH adjusting agent 21 can use an acid or an alkali agent, but in this embodiment, its structure is to circulate the electrolytic treatment solution from the electrolytic cell 12, so the pH value of the liquid is mainly biased toward the acid si...

Embodiment 2

[0091] FIG. 2 shows a schematic configuration diagram of a processing device related to the second embodiment. Hereinafter, in Embodiment 2 to Embodiment 8, a detailed description of the same configuration as in Embodiment 1 above will be omitted.

[0092] In addition to the structure of the above-mentioned embodiment 1, the present embodiment 2 is further provided with a reducing device for the electrolytic treatment solution. As the reduction device, it is preferable to use a device that supplies a reducing agent 22 to the circulation adjustment tank 11 as shown in FIG. 2 . As the above-mentioned reducing agent 22, well-known reducing agents such as sodium thiosulfate can be used.

[0093] In this way, by installing a reducing device in the system, excessively generated chlorine can be reliably decomposed, and the residue of chloramine or free chlorine can be suppressed. In addition, by suppressing the concentration of residual chlorine, it is possible to suppress the genera...

Embodiment 3

[0095] The structure of Example 3 shown in FIG. 3 is that, in addition to the structure of the above-mentioned Example 1, a denitrification device for denitrification by biological treatment is provided in the circulation system. It is provided with a biological treatment device 14 that introduces the electrolytic treatment solution from the above-mentioned electrolytic tank 12, and removes the NO remaining in the electrolytic treatment solution. 3 After -N, the treatment liquid flowing out from the biological treatment device 14 is introduced into the circulation adjustment tank 11 and circulated. In this embodiment, it is preferable that the electrolytic cell 12 is also of a sealed type.

[0096] The above-mentioned biological treatment device 14 is to make NO 3 -N decomposes to the device of nitrogen gas, can make proper use of biological fixed bed.

[0097] As described in this example, the NO in the electrolytic treatment solution is 3 -N removal device can reduce NO i...

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Abstract

A method of electrolyzing a wastewater containing ammonia nitrogen that is capable of avoiding any drop of current efficiency, enhancing the efficiency of ammonia decomposition and carrying out safe and efficient treatment of all types of nitrogen-containing wastewaters; and an apparatus therefor. There is provided an electrolyzer apparatus for a wastewater containing ammonia nitrogen, comprisingconditioning tank (11) for inflow of a wastewater containing ammonia nitrogen; electrolysis tank (12) for electrolyzing wastewater (20) fed from the conditioning tank in the presence of chloride ion;and circulation pump (13) for circulating the wastewater through the conditioning tank (11) and the electrolysis tank (12), wherein the electrolysis tank (12) is adapted to carry out electrolysis of the wastewater within the pH range of 5 to <8. Preferably, the electrolysis tank (12) thereinside is provided with a catalyst member consisting of a metal material so as to accelerate the decomposition reaction of ammonia nitrogen.

Description

technical field [0001] The invention relates to an electrolytic treatment method and device for wastewater containing ammoniacal nitrogen, which electrolytically treats wastewater containing ammoniacal nitrogen under the condition of chloride ions, thereby decomposing ammoniacal nitrogen into nitrogen gas and removing it. Background technique [0002] Nitrogen contained in wastewater is one of the main factors rich in nutrients such as rivers, lakes, or inner bays, so it is necessary to remove nitrogen from wastewater. The nitrogen content contained in wastewater also varies according to the type and properties of the wastewater, but most of them exist in the form of ammoniacal nitrogen. At present, it has been proposed to efficiently decompose the ammoniacal nitrogen into harmless nitrogen. And remove the technology from wastewater, and put it into practical use. [0003] Typical methods for removing ammoniacal nitrogen in wastewater include biological denitrification trea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461
CPCC02F1/4674C02F2301/046C02F2209/06C02F2101/16
Inventor 水谷洋大村友章浅野昌道丰田一郎长克美池卓加藤雄大
Owner MITSUBISHI HEAVY IND ENVIRONMENTAL & CHEM ENG CO LTD
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