Precautions for using the COD detector for electroplating wastewater portable water quality multi parameter detector

Description :

　　Precautions for using the COD detector for electroplating wastewater portable water quality multi parameter detector

　　Precautions for using the COD detector for electroplating wastewater portable water quality multi parameter detector

　　The quality of electroplating wastewater is complex, containing heavy metal ions such as chromium, zinc, copper, nickel, cadmium, as well as highly toxic impurities such as acids and bases.. The wastewater in this industry has many characteristics: complex composition, and pollutants can be divided into two categories: inorganic pollutants and organic pollutants. The water quality changes significantly, and the types of pollutants in various production wastewater are diverse, with a large coefficient of CODcr variation. Wastewater is highly toxic and contains a large amount of heavy metal ions. If discharged directly without treatment, it will cause significant pollution to the surrounding water..

　　1. Characteristics of COD production and discharge of electroplating wastewater:.

　　The electroplating process is generally divided into three parts: pre-treatment, electroplating, and post-treatment. These three parts all use some organic matter, which enters the washing water and generates wastewater during the subsequent cleaning process, forming a COD indicator.

　　2. The control requirements for COD discharge of electroplating wastewater in our country are based on the "Emission Standards for Electroplating Pollutants" enterprise regulations 21900-200841 issued by the State Environmental Protection Administration and the General Administration of Quality Supervision, Inspection and Quarantine. The COD emission limit is 80.

　　The following technical measures are proposed for the COD of electroplating wastewater:.

　　1) COD not only represents organic matter in water, but also inorganic substances with reducing properties in water. Electroplating companies often use Cl - in the pickling process of electroplating companies, and pickling black metals will produce a large amount of pickling Fe2. Therefore, COD in the wastewater should be excluded when testing indicators..

　　(3) It is recommended to test the biochemical oxygen demand index at the same time as the biochemical oxygen demand index, but the ecological environment protection department usually does not test the biochemical oxygen demand index in the "Emission Standards for Pollutants in the Electroplating Industry".. People generally believe that COD can basically represent all organic matter in water, and BOD is a biodegradable organic matter in water. Therefore, the difference between COD and BOD wastewater that cannot be biodegraded and utilized by organic matter can be expressed..

　　If the COD index in the wastewater is high, but the BOD index is also high, it indicates that the wastewater is mainly composed of degradable components that can be rapidly and naturally degraded in nature, and therefore should not meet the high requirements for wastewater indicators.

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