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Experimental Study of Water-saving Technology in Electroplating Cleaner Production

Author: NieLingYan
Tutor: HuangRuiMin
School: South China University of Technology
Course: Environmental Engineering
Keywords: electroplating wastewater water saving ultrafiltration nanofiltration ion exchange
CLC: X781.1
Type: Master's thesis
Year: 2011
Downloads: 82
Quote: 0
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Abstract


The mode of business operation of electroplating industry,and bring heavy pollution to environmental ,it is harmful to environmental. It also handicap the development of its own.In severe environmental、resources market situation and legal environment,cleaner production is imperative in electroplating industry. The emission of a large number of heavy metal wastewater from electroplating industry caused serious environmental pollution extremely easily. Implementing water saving technology,recycling electroplating wastewater, reducing wastewater emissions, Improving heavy metal utilization efficiency are the important methods to conduct electroplating cleaner production.This research use the membrane separation technology to recycle electroplating comprehensive discharged wastewater and ion exchange to recycle electroplating cleaning wastewater online. In order to research the water-saving technology in electroplating cleaner production.Using ion exchange to recycle copper and nickel plating cleaning wastewater, the best space flow velocity is 30L/（L·h）、20L/（L·h）respectively. The cycle of operation is 22h、19h respectively. The concentration of Cu2+, Ni2+ in effluent is lower than 0.5mg/L. The concentration of TDS in effluent is lower than 100mg/L, CODcr is lower than 20mg/L. It can be reused to cleaning section of plating production process. Recovery of wastewater is 90%. The concentration of Cu2+ in regeneration liquid（reusing half volume of regeneration liqui） of treatment of copper plating cleaning wastewate is 30.9g/L, The concentration of Ni2+ in regeneration liquid（reusing half volume of regeneration liqui） of treatment of nickel plating cleaning wastewate is 34.40g/L. Operating cost of recycling copper plating cleaning wastewate by ion exchange is 3.16yuan/m3, Operating cost of recycling nickel plating cleaning wastewate by ion exchange is 4.01yuan/m3.using ultrafiltration-nanofiltration combination process to recycle electroplating comprehensive discharged wastewater, under the condition of operating pressure is 0.2MPa, water flow is 1.0m3/h, the turbidity removal efficiency of rafiltration is 99%,turbidity is lower than 0.1NTU. Under the condition of operating pressure is 0.6MPa, water flow is 1.0m3/h of single nanofiltration membrane, ratio of refulx of the first NF is 0.6, the two stage nanofiltration membrane system has a high removal efficiency of pollutants. The quality of product water is: CODcr﹤10mg/L,TDS﹤100mg/L,turbidity:not detected. The product water can be reused to cleaning section of plating production process. Recovery of wastewater is 55%. Operation cost is 2.53yuan/m3.Membrane pollution become worse with the time going, the membrane flux and desalination efficiency drop, transmembrane pressure differential increase. Ultrafiltration prolong the chemical cleaning cycle of nanofiltration system of efficiently. The chemical cleaning cycle is 15d, 1.5 times the chemical cleaning cycle in case without ultrafiltration pretreatment. After physical and chemical cleaning, the Performance of nanofiltration recovered.Combine electroplating comprehensive discharged wastewater recycling and electroplating cleaning wastewater recycling online. Taking a electroplate factory for example, the total recovery efficiency is 72.5%. Rrecycle wastewater, reduce tap water consumption, recycle heavy metal, bring obvious economic benefits to enterprise. Reduce wastewater and heavy metals pollution, Ease the pressure on the environment, bring huge social and environmental benefits.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > Chemical industry,waste disposal and comprehensive utilization > Inorganic Chemical Industry > Electroplating,electrolysis industry
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