Metal Plating Wastewater Treatment Technology Overview And Outlook
Metal Plating Wastewater Treatment Technology Overview And Outlook
Abstract: This paper introduces a variety of commonly used plating metal wastewater treatment technology, and future trends of this technology.
Keywords: electroplating; heavy metals in wastewater; Treatment Electroplating wastewater treatment
general attention at home and abroad, developed a number of control technology, with the rapid development of electroplating industry, and Environmental protection Increasing demands, at present, electroplating wastewater treatment has entered the clean production technology, total control and integration phase of circular economy.
A heavy metal status of wastewater treatment technology used
(A) of the chemical method From electroplating wastewater treatment at home and abroad in recent decades, technological development trend, 80% of electroplating wastewater by chemical treatment, chemical treatment of wastewater, is the most widely used at home and abroad electroplating wastewater treatment technology, technology is more mature, including chemical precipitation, oxidation-reduction method, ferrite, etc., is a traditional and widely used method of treatment of electroplating wastewater, low investment, low cost processing, simple operation, applicable to all metal plating wastewater treatment, but the biggest chemical deficiencies, is the production of water can not be recycled, waste water and the large space occupied.
1. Chemical Precipitation Chemical precipitation method is to make the state of waste water was dissolved heavy metals into insoluble metal compounds of methods, including neutralization and sedimentation and sulfide precipitation, the method is a more mature and practical electroplating wastewater treatment technology and deal with low cost, ease of management, treated wastewater meeting the emission standard.
(1) and in precipitation, waste water containing heavy metals and adding alkali to the reaction to produce insoluble metal hydroxide precipitate forms to be separated and sedimentation method is simple and is commonly used in the treatment Waste Water.
(2) sulfide precipitation by adding sulfide to heavy metals in waste water generated sulfide precipitate and remove the method, compared with the precipitation and sulfide precipitation method's advantages are: the solubility of heavy metals than the hydrogen sulfide lower the solubility of oxide, the reaction between PH value 7-9, treated wastewater and in general do not have to deal better, but the disadvantage of sulfide precipitation are: sulfide precipitation particles is small, easy to form a colloid, residual sulfide precipitation in the water, with acids generated gas, may cause secondary pollution.
2. Redox Adding reducing agent to the waste water will be reduced to micro-high heavy metal heavy metal ions toxicity of low-cost, and then make it into the precipitation and separation of alkali removal method, the method is simple, operation is easy to grasp, but there are treatment poor water quality, can not reuse, mixed waste water treatment, could easily lead to secondary pollution, and general supplies and toxic oxidants are issues to be resolved.
3. Ferrite Ferrite Ferrite is based on the principles developed in the production approach, the treatment of heavy metal waste water, to a removal of various metal ions, especially for one-time mixed-metal plating wastewater treatment, with simple equipment less investment, easy to operate, while the formation of the sludge has high chemical stability, easy to micro-separation and dehydration treatment, the electroplating industry in the application of wider domestic, but the process requires the formation of ferrite heating (about 70 ), high energy consumption, there is high salinity treatment, but can not handle complex wastewater containing Hg and shortcomings.
(B) evaporation method
Evaporation method is electroplating waste water evaporation, so that can concentrate heavy metals in wastewater and recycling of way, the generally applicable to the handling of chromium, copper, silver, nickel and other heavy metals in wastewater containing heavy metal ion concentration low water, the direct application of vaporization of law energy consumption, high cost, evaporation of heavy metal wastewater treatment and other methods and is generally used, such as atmospheric pressure Evaporator Combined with the current wash system using treated wastewater, can achieve closed loop, a good effect, evaporation of metal plating wastewater treatment, process maturity is simple, does not require chemical reagents, no secondary pollution, water or valuable metal back , good Environment Effectiveness and economic efficiency, but energy consumption, high operating costs, interfere with recycling issues that impurities to be studied, so that application is limited, at present, generally as a means of other methods of secondary treatment.
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