CN111517423A - Treatment method for ammonia nitrogen in surface treatment wastewater - Google Patents

Treatment method for ammonia nitrogen in surface treatment wastewater Download PDF

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Publication number
CN111517423A
CN111517423A CN202010415548.8A CN202010415548A CN111517423A CN 111517423 A CN111517423 A CN 111517423A CN 202010415548 A CN202010415548 A CN 202010415548A CN 111517423 A CN111517423 A CN 111517423A
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CN
China
Prior art keywords
wastewater
ammonia nitrogen
surface treatment
anode
cathode
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CN202010415548.8A
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Chinese (zh)
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周磊
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Individual
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Individual
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Priority to CN202010415548.8A priority Critical patent/CN111517423A/en
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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
    • 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
    • C02F1/46104—Devices therefor; Their operating or servicing
    • 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
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • 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
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4619—Supplying gas to the electrolyte

Abstract

The invention discloses a method for treating ammonia nitrogen in surface treatment wastewater, which is characterized in that the wastewater is electrolyzed, so that the ammonia nitrogen in the wastewater is subjected to oxidation reaction at an anode to generate nitrogen and hydrogen ions, a cathode is subjected to hydrogen evolution reaction to generate hydrogen, substances generated by the reaction can not pollute the environment, the process is simple, the ammonia nitrogen in the surface wastewater can be effectively degraded, the ammonia nitrogen removal rate can reach 97.6%, the problem that the ammonia nitrogen in the surface wastewater is difficult to remove by a biochemical method due to extremely low biodegradability of the existing surface treatment wastewater is solved, the ammonia nitrogen in the surface treatment wastewater can be ensured to reach the standard and be discharged, any unsafe substances are not generated after the wastewater is treated, and the method is safe, reliable and cost-saving.

Description

Treatment method for ammonia nitrogen in surface treatment wastewater
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a method for treating ammonia nitrogen in surface treatment wastewater.
Background
The wastewater discharged by metal surface treatment enterprises contains a large amount of heavy metals, ammonia nitrogen, total phosphorus, ammonia nitrogen (mainly refractory organic matters) and the like, and the wastewater has very complex components and poor biodegradability. At present, most domestic surface treatment enterprises or parks treat heavy metal in wastewater to reach the standard by a physicochemical method, the wastewater is directly discharged into a secondary sewage treatment plant for further treatment, and the ammonia nitrogen stably reaches the B-level standard (45mg/L) of the Standard for Water quality of Sewage discharged into urban sewers. But part of enterprise wastewater is directly discharged into an external environment, ammonia nitrogen needs to reach the primary A standard (5mg/L) of pollutant discharge Standard of municipal wastewater treatment plant (GB18918-2002), and the materialized treatment of the wastewater of the metal surface treatment enterprise can basically reach 45mg/L, but does not basically reach 5 mg/L.
The most effective method for removing ammonia nitrogen in general wastewater is a biological method, but due to the extremely poor biodegradability of surface treatment wastewater, the ammonia nitrogen in the surface wastewater treated by the biological method is difficult, the wastewater can reach 45mg/L, but the wastewater can reach 5mg/L basically. With the increasing strictness of the national environmental protection situation, the comprehensive standard-reaching discharge of the metal surface treatment wastewater is imperative.
Therefore, the inventor aims to solve the problems that the method has high practicability, reduces environmental pollution, can effectively treat ammonia nitrogen in wastewater, enables the ammonia nitrogen in the wastewater to reach the standard and discharge, and is stable and reliable.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the treatment method for treating the ammonia nitrogen in the surface treatment wastewater, which has high practicability, reduces environmental pollution, can effectively treat the ammonia nitrogen in the wastewater, enables the ammonia nitrogen in the wastewater to reach the standard and be discharged stably and reliably.
The technical scheme adopted by the invention for solving the technical problems is as follows: the technical point of the method for treating ammonia nitrogen in surface treatment wastewater is that the method for treating ammonia nitrogen in surface treatment wastewater comprises the following steps:
(1) introducing the quantified surface treatment wastewater into an electrolytic cell;
(2) placing a cathode and an anode into an electrolytic bath, wherein the cathode and the anode both adopt metal titanium plates as electrodes, the distance between the cathode and the anode is 5cm, and the cathode and the anode are connected with a voltage-stabilizing direct-current power supply through electric wires;
(3) the temperature of the water in the electrolytic cell is 20-30 ℃, the power supply is started, and the current density is 40mA/cm2Carrying out electrolysis for 1-2 h, and stirring with air;
the ammonia in the electrolytic bath is oxidized on the anode to generate N2And H+Hydrogen evolution reaction occurs at the cathode to evolve hydrogen and generate OH-。
The invention has the beneficial effects that:
1. the method provided by the invention has the advantages that the process is simple, the ammonia nitrogen in the surface wastewater can be effectively degraded, the removal rate of the ammonia nitrogen reaches 97.6%, the problem that the ammonia nitrogen in the surface wastewater is difficult to remove by a biochemical method due to extremely low biodegradability of the existing surface treatment wastewater is solved, the ammonia nitrogen in the surface treatment wastewater can be discharged up to the standard, no waste polluting the environment is generated after the wastewater is treated, and meanwhile, no unsafe substances are generated, and the method is safe and reliable.
Drawings
FIG. 1 is a schematic structural diagram of an ammonia nitrogen wastewater treatment device provided by the embodiment of the invention.
Detailed Description
The invention will now be further illustrated by reference to specific examples, which are intended to be illustrative only and not to limit the scope of the invention. Further, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and such equivalents may fall within the scope of the invention as defined in the appended claims.
The figure 1 is a schematic structural diagram of an ammonia nitrogen wastewater treatment device provided by the embodiment of the invention.
Example 1
A method for treating ammonia nitrogen in surface treatment wastewater comprises the following steps:
1) 2L of raw water of the surface treatment wastewater is introduced into an electrolytic bath;
2) placing a cathode and an anode into an electrolytic bath, wherein the cathode and the anode both adopt metal titanium plates as electrodes, the distance between the cathode and the anode is 5cm, and the cathode and the anode are connected with a voltage-stabilizing direct-current power supply through electric wires;
3) the temperature of the water in the electrolytic cell is 22 ℃, the power supply is started, and the current density is 40mA/cm2And carrying out electrolysis and air stirring for 1 h.
Wherein, the quality of the raw water is detected before the experiment, and the detected concentration of each pollutant is as follows: COD450mg/L, ammonia nitrogen 42mg/L, TP1.5mg/L, total copper 0.15mg/L, total nickel 0.08mg/L, total chromium 0.05mg/L, total zinc 0.6mg/L, wherein the pH value is 8.1.
After the electrolytic reaction, various parameters of the wastewater in the electrolytic cell are detected, the results are COD320mg/L, ammonia nitrogen 1.021mg/L, TP1.2mg/L, total copper 0.00mg/L, total nickel 0.01mg/L, total chromium 0.00mg/L and total zinc 0.01mg/L, and the pH value of the solution after the reaction is 7.5.
The principle of the electrolyte in the cathode and anode reaction is as follows:
and (3) anode reaction: the ammonia is oxidized into nitrogen and hydrogen ions by oxidation chain scission reaction on the anode or in the close vicinity of the anode region or oxidation reaction with free radicals with strong oxidizing capability.
2NH3-6e→N2↑+6H+
And (3) cathode reaction: hydrogen evolution reaction is carried out at the cathode, hydrogen is evolved and OH is generated-Ions.
2H2O+2e→2OH-+H2↑
Example 2
The raw water used for the specific operation and experiment was the same as in example 1, and after the electrolytic reaction, the parameters of the wastewater in the electrolytic cell were detected, and the concentrations of the pollutants were detected as follows: COD332mg/L, ammonia nitrogen 1.262mg/L, TP1.3mg/L, total copper 0.00mg/L, total nickel 0.00mg/L, total chromium 0.00mg/L, total zinc 0.02mg/L, wherein the pH value is 7.6.
Example 3
The raw water used for the specific operation and experiment was the same as in example 1, and after the electrolytic reaction, the parameters of the wastewater in the electrolytic cell were detected, and the concentrations of the pollutants were detected as follows: COD300mg/L, ammonia nitrogen 1.13mg/L, TP1.2mg/L, total copper 0.01mg/L, total nickel 0.00mg/L, total chromium 0.00mg/L, total zinc 0.02mg/L, wherein the pH value is 7.5.
Through the experiment of above-mentioned embodiment, the ammonia nitrogen clearance in the waste water all is greater than 97%, can guarantee that the ammonia nitrogen discharges up to standard in the surface treatment waste water.

Claims (1)

1. A method for treating ammonia nitrogen in surface treatment wastewater is characterized by comprising the following steps: the method comprises the following steps:
(1) introducing the quantified surface treatment wastewater into an electrolytic cell;
(2) placing a cathode and an anode into an electrolytic bath, wherein the cathode and the anode both adopt metal titanium plates as electrodes, the distance between the cathode and the anode is 5cm, and the cathode and the anode are connected with a voltage-stabilizing direct-current power supply through electric wires;
(3) the temperature of the water of the electrolytic cell is 20-30 ℃, and the electrolytic cell is startedDynamic power supply with current density of 40mA/cm2And electrolyzing for 1-2 h while stirring with air.
CN202010415548.8A 2020-05-16 2020-05-16 Treatment method for ammonia nitrogen in surface treatment wastewater Pending CN111517423A (en)

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CN202010415548.8A CN111517423A (en) 2020-05-16 2020-05-16 Treatment method for ammonia nitrogen in surface treatment wastewater

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114409146A (en) * 2022-01-18 2022-04-29 中石化节能技术服务有限公司 Device and method for electrochemically catalyzing and degrading total nitrogen in high-salinity wastewater

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9826506D0 (en) * 1997-12-10 1999-01-27 Toshiba Kk Processing method of waste water and processing apparatus thereof
WO2006112521A1 (en) * 2005-04-15 2006-10-26 Mitsubishi Heavy Industries, Ltd. Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor
CN102107977A (en) * 2011-01-18 2011-06-29 南京大学 Method for recycling wastewater containing high-concentration ammonia nitrogen
CN109553163A (en) * 2019-01-18 2019-04-02 成都锐思环保技术股份有限公司 A method of electrolysis processing high ammonia-nitrogen wastewater
CN110683617A (en) * 2019-10-11 2020-01-14 浙江工业大学 Differential control based paired wastewater electrolysis treatment method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9826506D0 (en) * 1997-12-10 1999-01-27 Toshiba Kk Processing method of waste water and processing apparatus thereof
WO2006112521A1 (en) * 2005-04-15 2006-10-26 Mitsubishi Heavy Industries, Ltd. Method of electrolyzing wastewater containing ammonia nitrogen and apparatus therefor
CN102107977A (en) * 2011-01-18 2011-06-29 南京大学 Method for recycling wastewater containing high-concentration ammonia nitrogen
CN109553163A (en) * 2019-01-18 2019-04-02 成都锐思环保技术股份有限公司 A method of electrolysis processing high ammonia-nitrogen wastewater
CN110683617A (en) * 2019-10-11 2020-01-14 浙江工业大学 Differential control based paired wastewater electrolysis treatment method

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
宓赛邓·阿努沙: "电氧化法脱除废水中氨氮", 《广东化工》 *
李颖: "《垃圾渗滤液处理技术及工程实例》", 31 August 2008, 中国环境科学出版社 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114409146A (en) * 2022-01-18 2022-04-29 中石化节能技术服务有限公司 Device and method for electrochemically catalyzing and degrading total nitrogen in high-salinity wastewater

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