CN110746010A - Method for treating high ammonia nitrogen wastewater by adopting electrolysis method - Google Patents

Method for treating high ammonia nitrogen wastewater by adopting electrolysis method Download PDF

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Publication number
CN110746010A
CN110746010A CN201911079118.7A CN201911079118A CN110746010A CN 110746010 A CN110746010 A CN 110746010A CN 201911079118 A CN201911079118 A CN 201911079118A CN 110746010 A CN110746010 A CN 110746010A
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China
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ammonia nitrogen
high ammonia
wastewater
nitrogen wastewater
adopting
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Inventor
邓景永
朱识芝
吴永刚
曾媛媛
伍必青
李兆国
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Shenzhen Zhding Environmental Protection Technology Co Ltd
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Shenzhen Zhding Environmental Protection Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention provides a method for treating high ammonia nitrogen wastewater by adopting an electrolysis method, which belongs to the technical field of sewage treatment in the field of environmental engineering.

Description

Method for treating high ammonia nitrogen wastewater by adopting electrolysis method
Technical Field
The invention belongs to the technical field of sewage treatment in the field of environmental engineering, and particularly relates to a method for treating high ammonia nitrogen wastewater by adopting an electrolysis method.
Background
Ammonia nitrogen is one of the important factors causing water eutrophication, and with the increasing wastewater discharge standard, the requirement and the demand for removing residual ammonia nitrogen in wastewater are higher and higher. There are several methods for removing ammonia nitrogen from industrial wastewater, and the breakpoint chlorination method is often used because of its simplicity and feasibility. In the prior art, because the liquid contains more ammonia nitrogen components, the artificial treatment difficulty is increased, such as the phenomenon of bad smell and large odor concentration, and therefore, the method for effectively treating and removing the ammonia nitrogen components in the liquid is an urgent problem to be solved in the industry.
Disclosure of Invention
The invention provides a method for treating high ammonia nitrogen wastewater by adopting an electrolytic method, the operation method for removing ammonia nitrogen in the high ammonia nitrogen wastewater by adopting the electrolytic method is simple, and the generated copper ions can be recycled by a reduction reaction, so that better economic benefit can be generated.
The invention specifically comprises the following contents:
the invention aims to provide a method for treating high ammonia nitrogen wastewater by adopting an electrolytic method, which is technically characterized by comprising the following steps of:
s1, taking industrial high ammonia nitrogen wastewater, adjusting the pH value of the industrial high ammonia nitrogen wastewater to be alkaline, then filtering the industrial high ammonia nitrogen wastewater to obtain filtrate and filter residue, removing the filter residue, and taking the filtrate for later use;
s2, putting the industrial high ammonia nitrogen wastewater filtrate obtained by filtering in the step S1 into an electrolytic cell;
s3, electrifying the electrolytic cell, adding industrial salt into the electrolytic cell, and carrying out electrolytic reaction at the anode to generate sodium hypochlorite, wherein the specific reaction is as follows:
Cl--e-→Cl2
Cl2+H2O→HClO
HClO+Na+→NaClO+H+；
s4, oxidizing the high ammonia nitrogen wastewater filtrate input in the step S2 by the sodium hypochlorite prepared in the step S3, so as to remove ammonia nitrogen in the high ammonia nitrogen wastewater, and obtaining the treated wastewater.
In some embodiments of the invention, the ammonia nitrogen content of the high ammonia nitrogen wastewater in the step S1 is 98-500 mg/L.
In some embodiments of the present invention, the reagent used in the step S1 for adjusting the pH is one or more of sodium hydroxide, sodium bicarbonate and sodium carbonate.
In some embodiments of the present invention, the step S1 is to adjust the pH value to 11-13.
In some embodiments of the invention, the dosage of the filtrate of the high ammonia nitrogen wastewater in the step S2 is 0.5-17.17L.
In some embodiments of the present invention, the amount of the industrial salt added in step S3 is 385-485 g/L.
In some embodiments of the present invention, the current density of the current supplied in step S3 is 100 to 130mA/m2And the temperature of the electrolytic reaction is 20-40 ℃.
In some embodiments of the invention, the amount of sodium hypochlorite generated in step S3 is 0.35-50.05 mg/L;
in some embodiments of the invention, the content of ammonia nitrogen in the wastewater treated in step S4 is 1.25-14.71 mg/L, and the content of chloride ions in the treated wastewater is 0-0.04 wt.%.
In some embodiments of the present invention, the method for treating high ammonia nitrogen wastewater by using electrolysis further needs to remove copper ions reduced by the cathode, wherein the electrolysis formula of the reduced copper is as follows: cu +2e- → Cu, and the recycling of copper can greatly reduce the production cost and produce better economic benefit.
Compared with the prior art, the invention has the beneficial effects that:
the method for treating the high ammonia-nitrogen wastewater by the electrolytic method comprises four steps of pretreatment of the high ammonia-nitrogen wastewater, generation of sodium hypochlorite by the electrolytic method, electrolytic ammonia nitrogen removal of the high ammonia-nitrogen wastewater and post-treatment of the high ammonia-nitrogen wastewater.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Example 1
A method for treating high ammonia nitrogen wastewater by adopting an electrolysis method comprises the following steps:
s1, taking industrial high ammonia nitrogen wastewater, adjusting the pH value of the industrial high ammonia nitrogen wastewater to be alkaline, then filtering the industrial high ammonia nitrogen wastewater to obtain filtrate and filter residue, removing the filter residue, and taking the filtrate for later use;
s2, putting the industrial high ammonia nitrogen wastewater filtrate obtained by filtering in the step S1 into an electrolytic cell;
s3, electrifying the electrolytic cell, adding industrial salt into the electrolytic cell, and carrying out electrolytic reaction at the anode to generate sodium hypochlorite, wherein the specific reaction is as follows:
Cl--e-→Cl2
Cl2+H2O→HClO
HClO+Na+→NaClO+H+；
s4, oxidizing the high ammonia nitrogen wastewater filtrate input in the step S2 by the sodium hypochlorite prepared in the step S3, so as to remove ammonia nitrogen in the high ammonia nitrogen wastewater and obtain treated wastewater, wherein the specific reaction is as follows:
NaClO+H2O→HClO+NaOH
NH3+HClO→NH2Cl+H2O
NH2Cl+HClO→NHCl2+H2O
NHCl2+H2O→NOH+2Cl-+2H+
NHCl2+NOH→N2+HClO+H++Cl-
the overall reaction formula is: 2NH3+3NaClO→N2+3H2O+2NaCl。
Wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in the step S1, the adding amount of the filtrate of the high ammonia nitrogen wastewater in the step S2, the amount of the sodium hypochlorite generated in the step S3, the ammonia nitrogen content of the wastewater treated in the step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in Table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 2
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, step S1 is sodium carbonate for adjusting pH.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 3
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 4
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 5
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 6
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is a mixture of sodium bicarbonate and sodium carbonate.
Wherein, step S1 adjusts the pH to 11.
Wherein the adding amount of the industrial salt in the step S3 is 385 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolytic reaction is 40 ℃.
Example 7
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is a mixture of sodium hydroxide and sodium bicarbonate.
Wherein, step S1 adjusts the pH to 11.
Wherein the adding amount of the industrial salt in the step S3 is 385 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolytic reaction is 40 ℃.
Example 8
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 11.
Wherein the adding amount of the industrial salt in the step S3 is 385 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolytic reaction is 40 ℃.
Example 9
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 11.
Wherein the adding amount of the industrial salt in the step S3 is 385 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolytic reaction is 40 ℃.
Example 10
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium carbonate.
Wherein, step S1 adjusts the pH to 11.
Wherein the adding amount of the industrial salt in the step S3 is 385 g/L.
Wherein the current density of the current in step S3 is 130mA/m2The temperature of the electrolytic reaction is 40 ℃.
Example 11
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 13.
Wherein the adding amount of the industrial salt in the step S3 is 485 g/L.
Wherein the current density of the current in step S3 is 100mA/m2The temperature of the electrolysis reaction is 20 ℃.
Example 12
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 13.
Wherein the adding amount of the industrial salt in the step S3 is 485 g/L.
Wherein the current density of the current in step S3 is 100mA/m2The temperature of the electrolysis reaction is 20 ℃.
Example 13
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 13.
Wherein the adding amount of the industrial salt in the step S3 is 485 g/L.
Wherein the current density of the current in step S3 is 100mA/m2The temperature of the electrolysis reaction is 20 ℃.
Example 14
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 13.
Wherein the adding amount of the industrial salt in the step S3 is 485 g/L.
Wherein the current density of the current in step S3 is 100mA/m2The temperature of the electrolysis reaction is 20 ℃.
Example 15
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 13.
Wherein the adding amount of the industrial salt in the step S3 is 485 g/L.
Wherein the current density of the current in step S3 is 100mA/m2The temperature of the electrolysis reaction is 20 ℃.
Example 16
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 435 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 17
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 400 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 25 ℃.
Example 18
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is one or more of sodium hydroxide, sodium bicarbonate and sodium carbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 400 g/L.
Wherein the current density of the current in step S3 is 115mA/m2What is, what isThe temperature of the electrolysis reaction was 30 ℃.
Example 19
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 450 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolytic reaction is 300 ℃.
Example 20
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is a mixture of sodium bicarbonate and sodium carbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 460 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 21
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent used for adjusting the pH in the step S1 is sodium hydroxide.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 400 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
Example 22
The specific operation is the same as that in example 1, wherein the ammonia nitrogen content of the high ammonia nitrogen wastewater in step S1, the dosage of the filtrate of the high ammonia nitrogen wastewater in step S2, the amount of sodium hypochlorite generated in step S3, the ammonia nitrogen content of the wastewater treated in step S4, the chloride ion content of the treated wastewater and the copper ion content reduced at the cathode are shown in table 1.
Wherein, the reagent for adjusting the pH in the step S1 is sodium bicarbonate.
Wherein, step S1 adjusts the pH to 12.
Wherein the adding amount of the industrial salt in the step S3 is 450 g/L.
Wherein the current density of the current in step S3 is 115mA/m2The temperature of the electrolysis reaction is 30 ℃.
TABLE 1
Figure BDA0002263395220000151
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. A method for treating high ammonia nitrogen wastewater by adopting an electrolysis method is characterized by comprising the following steps: the method for treating the high ammonia nitrogen wastewater comprises the following steps:
s1, taking industrial high ammonia nitrogen wastewater, adjusting the pH value of the industrial high ammonia nitrogen wastewater to be alkaline, then filtering the industrial high ammonia nitrogen wastewater to obtain filtrate and filter residue, removing the filter residue, and taking the filtrate for later use;
s2, putting the industrial high ammonia nitrogen wastewater filtrate obtained by filtering in the step S1 into an electrolytic cell;
s3, electrifying the electrolytic cell, adding industrial salt into the electrolytic cell, and carrying out electrolytic reaction at the anode to generate sodium hypochlorite, wherein the specific reaction is as follows:
Cl--e-→Cl2
Cl2+H2O→HClO
HClO+Na+→NaClO+H+；
s4, oxidizing the high ammonia nitrogen wastewater filtrate input in the step S2 by the sodium hypochlorite prepared in the step S3, so as to remove ammonia nitrogen in the high ammonia nitrogen wastewater, and obtaining the treated wastewater.
2. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: and in the step S1, the ammonia nitrogen content of the high ammonia nitrogen wastewater is 98-500 mg/L.
3. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the reagent used for adjusting the pH in the step S1 is one or more of sodium hydroxide, sodium bicarbonate and sodium carbonate.
4. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: and S1, adjusting the pH value to 11-13.
5. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: and in the step S2, the adding amount of the high ammonia nitrogen wastewater filtrate is 0.5-17.17L.
6. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the adding amount of the industrial salt in the step S3 is 385-485 g/L.
7. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the current density of the power-on in the step S3 is 100-130 mA/m2And the temperature of the electrolytic reaction is 20-40 ℃.
8. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the amount of the sodium hypochlorite generated in the step S3 is 0.35-50.05 mg/L.
9. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the content of ammonia nitrogen in the wastewater treated in the step S4 is 1.25-14.71 mg/L, and the content of chloride ions in the treated wastewater is 0-0.04 wt.%.
10. The method for treating high ammonia nitrogen wastewater by adopting an electrolysis method according to claim 1, characterized in that: the method for treating the high ammonia nitrogen wastewater by adopting the electrolysis method also needs to remove copper ions reduced by the cathode.
CN201911079118.7A 2019-11-07 2019-11-07 Method for treating high ammonia nitrogen wastewater by adopting electrolysis method Pending CN110746010A (en)

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