阅读说明：本技术 一种表面处理废水中cod的处理方法 (Treatment method of COD 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COD的处理方法,通过对废水进行电解,使废水中的有机物在阳极发生氧化反应生成二氧化碳和氢离子,阴极发生析氢反应,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COD,COD去除率可达到95.1％,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COD的问题,能够保证表面处理废水中COD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 COD (chemical oxygen demand) in surface treatment wastewater, which is characterized in that organic matters in the wastewater are subjected to oxidation reaction at an anode to generate carbon dioxide and hydrogen ions, a cathode is subjected to hydrogen evolution reaction, substances generated by the reaction can not pollute the environment, the process is simple, the COD in the surface wastewater can be effectively degraded, the removal rate of the COD can reach 95.1%, the problem that the COD 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 COD in the surface treatment wastewater can be ensured to reach the standard and be discharged, no unsafe substances are generated after the wastewater is treated, and the method is safe, reliable and cost-saving.)

1. A treatment method of COD in surface treatment wastewater is characterized in that: 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 cell, wherein the cathode and the anode both adopt metal titanium coating electrodes, the distance between the cathode and the anode is 1cm, and the cathode and the anode are connected with a voltage-stabilizing direct-current power supply through electric wires;

(3) of water in electrolytic cellsThe temperature is 20-30 ℃, the power supply is started, and the current density is 60mA/cm²And electrolyzing for 1.5-2.5 h while stirring with air.

Technical Field

The invention relates to the technical field of wastewater treatment, in particular to a treatment method of COD in surface treatment wastewater.

Background

The wastewater discharged by metal surface treatment enterprises contains a large amount of heavy metals, ammonia nitrogen, total phosphorus, COD (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 COD (chemical oxygen demand) stably reaches the B-level standard (500mg/L) of the Water quality Standard of wastewater discharged into urban sewers. However, part of enterprise wastewater is directly discharged into an external environment, COD (chemical oxygen demand) needs to reach the primary A standard (30mg/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 500mg/L, but 30mg/L is basically impossible.

The most effective method for removing COD in the waste water is a biological method, but the biodegradability of the surface treatment waste water is very poor, the COD in the surface treatment waste water is difficult to treat by the biological method, the discharged water can reach 500mg/L, but the discharge water can reach 30mg/L basically without possibility. Along with the increasing strictness of 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 for treating COD in surface treatment wastewater is high in practicability, capable of reducing environmental pollution, capable of effectively treating COD in wastewater and enabling COD in wastewater to reach the discharge standard, 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 COD in the surface treatment wastewater, which has high practicability, reduces environmental pollution, can effectively treat the COD in the wastewater, enables the COD in the wastewater to reach the standard and discharge, and is stable and reliable.

The technical scheme adopted by the invention for solving the technical problems is as follows: the technical point is that the method for treating COD in the 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 cell, wherein the cathode and the anode both adopt metal titanium coating electrodes, the distance between the cathode and the anode is 1cm, 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 60mA/cm²Carrying out electrolysis for 1.5-2.5 h, and stirring with air; the organic matter in the electrolytic bath is oxidized on the anode to generate CO₂And H⁺Hydrogen evolution reaction occurs at the cathode to evolve hydrogen and generate OH^-。

The invention has the beneficial effects that:

1. the process provided by the invention is simple, can effectively degrade COD in the surface wastewater, has a COD removal rate of 95.1%, solves the problem that the COD in the surface wastewater is difficult to remove by a biochemical method due to extremely low biodegradability of the existing surface treatment wastewater, can ensure that the COD in the surface treatment wastewater is discharged up to the standard, does not generate any waste polluting the environment after the wastewater is treated, does not generate any unsafe substances, and is safe and reliable.

Drawings

FIG. 1 is a schematic structural view of a COD-containing wastewater treatment apparatus provided in an embodiment of the present 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.

FIG. 1 is a schematic structural view of a COD-containing wastewater treatment apparatus according to an embodiment of the present invention.