Ultraviolet sterilization treatment in electroplating wastewater

Treatment of Electroplating Wastewater by UV Sterilization ã€Abstractã€‘ When an electroplating factory contains a variety of electroplating wastewater, such as cyanide wastewater, hexavalent chromium wastewater, acid and alkali, heavy metals copper, nickel, zinc and other integrated wastewater, generally taken Wastewater diversion treatment method, first cyanide-containing waste water, chromium-containing waste water should be separately collected from the production line, respectively, in accordance with the above-mentioned corresponding methods for the treatment of cyanogen-containing, chromium-containing waste water, treated waste water mixed into the integrated waste water together with the coagulation Precipitation method for subsequent processing.

Keywords: UV, sterilization, disinfection, water treatment I. UV disinfection treatment process in the electroplating wastewater There are many kinds of electroplating production process, due to different electroplating process, the waste water produced is also different, the general electroplating enterprises discharged Wastewater includes pre-treated waste water such as acid and alkali, cyanide-containing copper-plated cyanide-containing waste water, copper-containing waste water, nickel-containing waste water, and chromium-containing waste water and other heavy metal waste water. There are also a variety of electroplating waste liquids. Electrochemical decolorization electrochemical method is to purify wastewater through electrode reaction. According to the electrode reaction mode, electrochemical methods can be subdivided into internal electrolysis, electroflocculation and electrical floatation, and electrooxidation. The most famous internal electrolysis method is the iron filing method.

There are different treatment methods for electroplating wastewater containing different types of pollutants, which are described as follows:

1. Ultraviolet sterilization of cyanide-containing waste water (that is, the process of using UV sterilizer or UV sterilizer) Disinfection process At present, the more mature technology for the treatment of cyanide-containing waste water is alkaline chlorination. Care must be taken to ensure that cyanide-containing waste water is strictly treated with other waste water. Shunt to avoid mixing nickel, iron and other metal ions, otherwise it is difficult to handle. The principle of this method is to remove the cyanide from the waste water under alkaline conditions using a chlorine-based oxidant. The treatment process is divided into two stages. The first stage is to oxidize cyanogen to cyanate. Thoroughly called the incomplete oxidation stage, the second stage is the further oxidative decomposition of cyanate into carbon dioxide and water, called the complete oxidation stage.

Processing process:

Cyanide-containing waste water â†’ Conditioning tank â†’ First-break cyanide tank â†’ Secondary cyanide-breaking tank â†’ Inclined sedimentation tank â†’ Filtration tank â†’ Call-back tank â†’ Ultraviolet sterilization equipment (ultraviolet sterilizer or UV sterilizer) â†’ Effluent wastewater after discharge Mixed into the electroplating integrated wastewater for treatment.

2. Chromium-containing waste water UV disinfection (that is, the use of UV sterilizer or UV sterilizer) Disinfection process Chromium hexavalent chromium wastewater is generally treated with chromium reduction method. The principle of this method is to add reducing agent sulfuric acid under acidic conditions. Iron, sodium sulfite, sodium bisulfite, sulfur dioxide, etc., will reduce hexavalent chromium to trivalent chromium, and then adjust the pH by adding sodium hydroxide, calcium hydroxide, lime, etc. to make trivalent chromium hydroxide precipitate from Wastewater separation.

The processing flow is as follows:

Cr6+ waste waterâ†’regulating tankâ†’reduction tankâ†’coagulation tankâ†’sedimentation tankâ†’filterâ†’pH feedback tankâ†’discharge 3. Synthetic heavy metal wastewater UV disinfection (ie UV disinfection or UV disinfection process) Disinfection process flow synthesis Heavy metal wastewater is composed of heavy metal wastewater containing copper, nickel, zinc and other non-complexes, and acid and alkali pretreatment wastewater. This kind of wastewater treatment method is relatively simple, and it is generally treated by the process of producing hydroxide precipitation under alkaline conditions.

The processing flow is as follows:

Integrated Heavy Metal Wastewater â†’ Conditioning Tank â†’ Fast Mixing Tank â†’ Slow Mixing Tank â†’ Inclined Pipe Sedimentation Tank â†’ Filtration â†’ pH Charging Pond â†’ UV Sterilization Equipment (UV Sterilizer or UV Sterilizer) â†’ Emissions Sterilization (ie UV disinfection or UV disinfection process) Disinfection process When an electroplating factory contains a variety of electroplating wastewater, such as cyanide wastewater, hexavalent chromium wastewater, acid and alkali, heavy metals copper, nickel, zinc and other integrated wastewater Generally, the waste water diversion treatment method is adopted. First, cyanide-containing waste water and chromium-containing waste water should be separately collected from the production line, and then the cyanogen-containing and chromium-containing waste water should be treated according to the above-mentioned corresponding methods. The treated waste water is mixed into the comprehensive waste water together with it. The coagulation sedimentation method was used for subsequent treatment.

The processing flow is as follows:

Cyanide-containing waste water â†’ Conditioning tank â†’ First-break cyanide tank â†’ Secondary cyanide-breaking cistern â†’ Integrated wastewater tank chromium-containing waste water â†’ Conditioning tank â†’ Chromium reduction tank â†’ Integrated waste water tank comprehensive waste water â†’ Integrated waste water tank â†’ Fast mixing tank â†’ Slow mixing tank â†’ inclined tube sedimentation tank â†’ intermediate pool â†’ filter â†’ pH correction tank â†’ ultraviolet disinfection equipment (ultraviolet sterilizer or UV sterilizer) â†’ What are the methods for chromaticity absorption of discharged wastewater:

Currently used wastewater treatment technologies can effectively remove the color of wastewater by adsorption, coagulation, biological, membrane separation, chemical oxidation, and electrocoagulation.

1. Adsorption decolorization Adsorption decolorization technology relies on adsorption of adsorbent to remove color. The commonly used adsorbents include regenerable adsorbents such as activated carbon, ion exchange fibers, and non-renewable adsorbents such as various natural minerals (bentonite, diatomaceous earth), industrial waste (cinder, fly ash), and natural waste (charcoal, Sawdust) etc. At present, the adsorbent used for adsorption and decolorization depends mainly on physical adsorption, but ion-exchange fibers, modified bentonites, etc. also have chemical adsorption.

2. Flocculation Decolorization Coagulation and decolorization is the use of flocculants to flocculate the color forming material in the waste water for decolorization.

Flocculation and decolorization technology, with low investment cost, small equipment and large amount of processing, is a commonly used decolorization technology.

Inorganic coagulants include metal salts and inorganic polymer flocculants. The widely used metal salts include aluminum salts and iron salts. Inorganic polymer flocculants are a new class of water treatment agents developed on the basis of traditional metal salt flocculants. They are highly adaptable, non-toxic, and The Beijing Polytechnic Institute's home page has been rapidly developed and widely used.

Organic polymer flocculant, polyacrylamide (PAM) is the most widely used, it has non-ionic, cationic and anionic three.

Oxidation Decolorization Chemical Oxidation Decolorization refers to the use of the oxidizing properties of chlorine, ClO2, O3, H2O2, HClO4, and hypochlorite to break the chromophoric groups in the wastewater or change its chemical structure under certain conditions. To achieve the purpose of decolorization of waste water.

Oxidation methods include chemical oxidation, photocatalytic oxidation and ultrasonic oxidation. Although the specific process is different, the decolorization mechanism is the same. Chemical oxidation is currently a more mature method of research. Fenton reagent (Fe2+-H2O2), ozone, chlorine gas, sodium hypochlorite, etc. are generally used as the oxidant.

This article Source: Shijiazhuang Ling Zhuo Environmental Equipment Co., Ltd. Please indicate the source: http://
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