Effect Analysis and Comparison of Different Types of Reducing Agents on Treatment of Electroplating Wastewater Containing Chromium
Chemical precipitation is a common method to treat chromium-containing wastewater in electroplating industry,which usually adopts the way of reducing agent and hydrolysis to achieve solid-liquid separation of chromium in the form of chromium hydroxide.The effects and characteristics of several different types of reducing agents in the treatment of chromium-containing wastewater were studied,and the treatment effects,apparent phenomena,pharmaceutical costs,and slag production were compared and analyzed.The results show that ferrous sulfate,sodium bisulfite and sodium metabisulfite can all make hexavalent chromium treatment meet the emission requirements(<0.2 mg/L)of hexavalent chromium in the Discharge Standard of Electroplating Pollutants(GB21900-2008)when the concentration of chromium in raw water is 500 mg/L,but from the aspects of sodium hydroxide consumption,the apparent phenomenon after flocculation and precipitation,the amount of slag produced,the total cost of the agent after comprehensive consideration,the consumption of sodium bisulfite and the amount of sodium hydroxide required in the hydrolysis process are the least,so the total cost of the agent is the lowest,the amount of slag produced is the least,the effluent is apparently colorless and clear,and it is the most suitable reducing agent.
electroplatechromium-containing wastewaterreductanteffect analysiscost and amount of slag
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