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  • Electroplating wastewater treatment equipment zl-ddws001

    Source: electroplating wastewater treatment equipment Author: Bluestar Time: 2015-09-05 14:57:02 Views: Times

    Electroplating wastewater treatment equipment

    Electroplating wastewater treatment equipment

    Basic equipment configuration:
    Name: Electroplating wastewater treatment equipment
    Model: zl-ddws001
    Amount of sewage treatment 2 (m3 / h)
    Model HD-1
    Ozone dosage 20 (g / h)
    Air volume 200 (m3 / min)
    Air tank capacity 10 (m3)
    Flowmeter specification 3 (m3 / h)
    Outlet pipe diameter 200 (mm)
    Inlet pipe diameter 200 (mm)
    Aerator power 30 (kw)

    Equipment overview:
    1. Source of electroplating wastewater Electroplating is a versatile, widely used, cross-industry and cross-sector production industry. In the production process, a large amount of water must be used to meet the process requirements. Once the water quality exceeds the process standards, wastewater is discharged. Electroplating wastewater mainly comes from pre-treatment of plating parts and electroplating rinsing water.
    2. Characteristics of electroplating wastewater From the typical production process of electroplating and the actual situation of the construction unit, it can be seen that many links in the production process will produce a lot of wastewater, and its wastewater has the following characteristics:
    (1) The composition is complicated. Different plating types are used due to different requirements for the plating process. When wastewater contains cyanide and heavy metal ions, they must be treated separately.
    (2) Higher content. The content of various heavy metals in wastewater is generally below 50mg / L, and individual species reach more than 100mg / L. Especially the discharge of electroplating solution is prone to produce shock loads.
    (3) Toxic. Wastewater containing chromium, nickel, copper and other heavy metal ions and cyanide are toxic and have a certain inhibitory effect on the general microbial activity of biochemical treatment. Special biological strains must be used.
    (4) The mixed arrangement is serious. It is difficult for a park or a large electroplating city to discharge the wastewater of various plating species by quality. The COD concentration is high, and comprehensive treatment capacity must be considered.
    (5) Intermittent discharge. The quality and quantity of water discharged every day according to production needs can only be considered in the design, which increases the one-time investment.

    Electroplating wastewater treatment equipment

    Electroplating wastewater treatment equipment

    Electroplating is the use of chemical and electrochemical methods to plate various metals on metal or other materials. Electroplating technology is widely used in machinery manufacturing, light industry, electronics and other industries.
    The composition of electroplating wastewater is very complicated. Except for cyanide (CN-) wastewater and acid-base wastewater, heavy metal wastewater is a potentially hazardous wastewater category in the electroplating industry. According to the classification of heavy metal elements contained in heavy metal wastewater, it can generally be divided into chromium (Cr) wastewater, nickel (Ni) wastewater, cadmium (Cd) wastewater, copper (Cu) wastewater, zinc (Zn) wastewater, Wastewater containing gold (Au), wastewater containing silver (Ag), etc.
    The treatment of electroplating wastewater has received widespread attention at home and abroad. A variety of treatment technologies have been developed to eliminate and reduce heavy metal emissions through measures such as toxic treatment to non-toxic, harmful to harmless, precious metal recovery, and water recycling. With the rapid development of the electroplating industry and the increasing requirements for environmental protection, currently, electroplating wastewater treatment has begun to enter the stage of clean production process, total volume control and circular economy integration. Resource recycling and closed-loop circulation are the mainstream development directions.
    Current status of electroplating heavy metal wastewater treatment technology < br Aiming at the statistics and investigation of the current status of wastewater treatment in the electroplating industry in our country, there are mainly 7 different classification methods:
    1. Chemical precipitation method is divided into neutralization precipitation method and sulfide precipitation method.
    2. Redox treatment, which is divided into chemical reduction method, ferrite method and electrolytic method.
    3. Solvent extraction and separation.
    4. Adsorption method.
    5. Membrane separation technology.
    6. Ion exchange method.
    7. Biological treatment technology, including biological flocculation method, biological adsorption method, biochemical method, phytoremediation method. But at present there are certain disadvantages or serious irrationality.
    Disadvantages of traditional electroplating wastewater treatment methods
    At present, the treatment method of electroplating wastewater generally adopts the physical and chemical method of splitting-integrated two-stage treatment. The front section treats three branches of water: chrome water, cyanide water and comprehensive water (copper nickel zinc water). Chromium water is reduced with a reducing agent, and cyanide water is used for two-stage oxidation to break cyanide. Copper-nickel-zinc water is directly combined with the first two streams to form comprehensive water. In the later stage, the comprehensive water is treated with alkali (caustic soda or lime), polyaluminum chloride (PAC), and organic flocculant (PAM). The specific operation is: the pH of the comprehensive water is mentioned to 10 ~ 13, and the alkali concentration It is large and forces the reaction between the base and the heavy metal to proceed in the direction of generating hydroxide. Because pH> 9, the discharge port must be neutralized with acid to reduce the pH to below 9.
    The above are traditional processing techniques, and there are many serious theoretical and practical errors:
    1. The division of the three sewage before treatment is not in line with the actual production, because whether you have me or you in that water, it is only chromium water that is mainly chromium, cyanide water that is mainly cyanide, and copper Ni-Zn trihydrate is mostly composed of 3 elements. We have found these actual situations in the practice of wastewater treatment, which is the case for almost all enterprises' electroplating wastewater. We have asked the relevant personnel of the electroplating plant, in fact, they can make the cause of this phenomenon very clear. It is strange that the sewage management department actually took the diversion-integrated two-stage treatment as a normative model that cannot be violated. Since various pollutants are present in the sewage treated in the second stage, how can it be possible to discharge the terminal water up to standard with simple treatment chemicals and methods?
    2. Many special discussions will mention that cyanide water should be treated separately because cyanide will generate extremely toxic HCN (cyanic acid) in the acid solution, and its volatilization will definitely cause human poisoning. This is true in theory, and we really need to pay close attention to it. However, we found that most of the cyanide water itself is a liquid with a pH <6, and if it is to be volatilized, it may be in the workshop, and it will not flow to the sewage pond and then volatilize. Besides, cyanic acid itself is a liquid, but its volatilization temperature is low (26 C), so there is no volatility problem when the outside temperature is <26 C.
    3. Mandatory use of super alkali to cause heavy metals to form hydroxides to precipitate in sludge, which is unscientific:
    (1). From the principle of chemical reaction, no matter what kind of pH condition, there is a reaction equilibrium, that is to say, it can never reach a certain amount of heavy metals in water.
    (2). The optimal pH (pH value) of different heavy metals to form hydroxides is different. The most suitable pH range for some heavy metals may be the pH conditions for re-dissolution of other metals.
    (3). Because the second stage treatment is super alkali removal of heavy metals, the final discharged water must also be super alkali, which will necessitate to add acid to the water at the discharge port in order to reach the pH value of the discharge standard. As a result of the addition of acid, the fine hydroxides that have not precipitated quickly decompose, and the heavy metals return to the water.
    (4). Due to the diversion-convergence of two sewage treatments, the engineering equipment is naturally more complicated, resulting in a large and long investment in engineering construction.

    Electroplating wastewater treatment equipment

    Electroplating wastewater treatment equipment

    Treatment of electroplating wastewater by the mineral method <br /> The mineral method is a patented NMSTA natural mineral wastewater treatment and mineral powder BC that uses pure natural minerals as raw materials and processed through a certain special process. Some auxiliary agents are added A method for mixing treatment of electroplating wastewater. Since this method mainly uses pure natural minerals as the main raw material, its characteristics include ion exchange, adsorption, chemical conversion, and catalytic properties.
    The main advantages of this method are as follows:
    1. Thoroughly change the traditional process of shunt treatment for a long time, and mix chromium water, cyanide water, and comprehensive water for processing, and correct some serious errors in the shunt treatment, and make up for the disadvantages of the traditional process.
    2. After one stage of processing, the problem can be completely solved, and the traditional two-stage processing mode has been changed.
    3. Due to the above two points, the engineering equipment for sewage treatment has been greatly simplified, and infrastructure investment and engineering construction time have been greatly reduced.
    4. The traditional treatment method is theoretically impossible to reach the standard, and a large number of practices have proved that the process does not meet the emission standard. If the mineral method is used to treat electroplating wastewater, both the principle and the practice show that it can stably meet the discharge standards.
    5. The traditional chemical treatment cost of electroplating wastewater is mainly used for caustic soda to neutralize acid water. In general, the cost of caustic soda for one ton of sewage is 6 ~ 10 yuan. In addition to other chemicals, the total pharmaceutical cost is more than 10 yuan. It is true that if only the wastewater is to be clarified, it will be difficult to set a standard for the cost. Apply the mineral method, provided that emissions are met. The cost of treating one ton of wastewater is about 4 ~ 6 yuan.

    Electroplating wastewater treatment equipment

    Electroplating wastewater treatment equipment

    The electroplating wastewater treatment process independently developed by our company overcomes the shortcomings of traditional chemical methods such as high energy consumption and large sludge production, as well as the shortcomings of high operating costs and incomplete treatment of electrolytic recovery and distillation, and retains the original zero-emission technology using physics. The method has the advantages of separating the electroplating and cleaning wastewater, and has achieved a high metal ion concentration efficiency. The metal ion concentrated liquid can reach the working concentration of returning to the tank. The cleaning frequency is low, and the replacement cycle is more than two years.

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