Experimental Study On The Treatment Of Chromium-Containing Wastewater By Aged-Refuse

The Chromium containing Wastewater exists massively in the industry firms that apply chromium and its compound into leather, pharmacy, dyeing industry, galvanization, chrome ore, and photography material, etc. In addition, since there are chromite ore residue contaminated site in many provinces and cities in our country. Especially in China because of historical reasons, the chromium salt slag produced by the production company simply piled up, leading to the production of chromium leachate, contaminated soil and groundwater. Therefore, apart from the industrial enterprises need to deal with waste water containing chromium, the chromium slag contaminated site remediation in recent years, particularly in situ leaching, or ectopic wash all produce large amounts of wastewater containing chromium (mainly containing Cr (VI), because Cr (VI) dissolved in water), they need for treatment Development wastewater treatment technology by aged-refuse containing chromium is of practical significance.This article has mainly studied the technical feasibility and the elimination mechanism of disposing chromium-containing waste water by the aged-refuse. Research include: wastewater containing chromium disposal study approved test by the aged-refuse; the study of the biological reaction of chromium-containing waste water column bed processing experiment by the aged-refuse; the elimination mechanism of disposing chromium-containing waste water by the aged-refuse.The results are as follows:1,The aged refuse bioreactor wastewater containing chromium has good treatment effect, experiments show that, under the conditions that The hexavalent chromium concentration in the water to keep the 10mg/L,350.18 g the aged refuse waste under anaerobic conditions without sterilization treatment was the best,the water has not been detected in Cr6+, and using non-sterile downstream (aerobic) means water, in tests of the first 29 days, can begin to detect Cr6+, and using sterilization countercurrent (anaerobic), in tests of the first 27 days can detect Cr6+ began. Water concentration increased to 20mg/L, and add organic matter, the treatment effect remains that trend. Anaerobic conditions is not sterilization is besr, followed by non-sterile aerobic, anaerobic and finally sterilization.2,The static state experiment by the aged-refuse adsorption chromic waste water indicates that the adsorption capacity of Hexavalent chromium in the aged-refuse is influenced by temperature, pH value, the initial concentration, size and solid-liquid ratio factors.3,The uniform temperature adsorption process can be better describe with Frendlich and other diffusion models.4,The adsorption kinetics equation about the aged-refuse adsorption hexavalent chromium can be described in Elovich , as well as inner-diffusion model.5,Mechanism research shows:Chromium in the aged refuse removal process is mainly to Cr (VI) reduction for Cr (â…¢) and then adsorption the Cr (â…¢) . There are also a small amount of Cr (VI) adsorbed directly by aged refuse.