阅读说明：本技术 一种表面处理废水中氨氮的处理方法 (Treatment method for ammonia nitrogen in surface treatment wastewater ) 是由 周磊 于 2020-05-16 设计创作，主要内容包括：本发明公开了一种表面处理废水中氨氮的处理方法,通过对废水进行电解,使废水中的氨氮在阳极发生氧化反应生成氮气和氢离子,阴极发生析氢反应产生氢气,反应生成的物质不会污染环境,工艺简单,能够有效降解表面废水中的氨氮,氨氮去除率可达到97.6％,解决了现有表面处理废水因可生化性极低导致的难以用生化法去除表面废水中氨氮的问题,能够保证表面处理废水中氨氮达标排放,废水处理后不产生任何不安全的物质,安全可靠,节约成本。(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.)

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.

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.