Method for realizing reliable standard emission for electroplating wastewater by pure chemical precipitation method
A chemical precipitation method, electroplating wastewater technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of short regeneration cycle, complicated equipment, difficult operation and management, etc.
Inactive Publication Date: 2013-03-13
田农
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Problems solved by technology
For the general nickel plating solution of about 5g / L, it should be diluted about 4 times, which will greatly increase the water consumption, and it will be a difficult problem for enterprises with a large amount of wastewater.
[0005] 2. The exchange capacity of the resin is low and the regeneration cycle is short, which brings certain difficulties to the operation and management
In addition, the device of resin exchange method is more complicated than that of simple chemical precipitation method.
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[0052] This method has been implemented in Zhuozhou Sanhuan Textile Equipment Co., Ltd., Hebei Province for five years with good results and has reached the standard every year. According to spot checks by higher-level professional departments and detection by flame atomic absorption spectrophotometry, the maximum value of the external drainage for five years is 0.27mg / L (the allowable value of the national standard is 1mg / L), so that the enterprise can survive and create for sustainable development. conditions. At present, there are nearly 50 companies in the same product industry across the country. Once this patent is approved, it will be promoted to it. Other electroplating nickel industries can also adopt.
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The invention relates to a method which can effectively process industrial nickeliferous electroplating wastewater by a pure chemical precipitation method, and is suitable for nickeliferous sewage treatment for industrial electronickelling, belonging to the technical field of environment protection in industrial production. In the prior art, an ion exchange method is used to process nickeling wastewater generated in industrial electroplating generally, which can not be used when nickeliferous amount in the wastewater reaches 5g / L. The above difficult problem can be easily solved by adopting the pure chemical precipitation method which comprises the steps of nickel ion neutralization by sodium hydroxide, segregation, precipitation and filter cake removal and has the chemical reaction formula as shown in the specification. The method has the following main technical points: 1, a precipitation tank after primary alkali addition is ensured to be uniform, and preferably, the pH value thereof is 9.7-10.5; and 2, the PH value of an outer drain tank is no less than 8.3.
Description
[0001] 1. Technical field: environmental protection in the electroplating (casting) industry [0002] 2. Field of application: sewage treatment of industrial nickel plating 3. Background technology [0003] Electroplating (casting) sewage generally uses ion exchange technology to exchange nickel ions in the wastewater with sodium ions on the resin to be removed, but this method has two main problems: [0004] 1. It is more suitable for the situation where the nickel ion content is relatively small (the nickel content is below 1g / L). For the general nickel plating solution of about 5g / L, it should be diluted about 4 times, which will greatly increase the water consumption, and it will be a difficult problem for enterprises with a large amount of wastewater. [0005] 2. The exchange capacity of the resin is low and the regeneration cycle is short, which brings certain difficulties to the operation and management. In addition, the device of the resin exchange method is more com...
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IPC IPC(8): C02F1/52
Inventor 田农
Owner 田农