The Study On The Application Of The Surface Molecularly Imprinted Adsorbent By Penicillium Chysogenum Mycelium In Chrome Tanning Effluent

The adsorption behavior of the surface molecularly imprinted adsorbent by penicillium chysogenum mycelium(the surface imprinted adsorbent) was studied. The results show that the maximum adsorption capacity for Cr3+was about60mg/g and its adsorption behavior accorded with the equation of Langmuir. The adsorption capacity is50mg/g, at the initial Cr3+concentration of200mg/L at pH3-4. Ionic strength, Ca2+and Mg2+had negligible effect on the adsorption. The saturated adsorbent can be desorbed by0.5M nitric acid or sulfuric acid solution, with a90%desorption rate for Cr3+. Regenerated by0.2M NaOH solution, the adsorbent can be reused more than10times.The adsorbent accommodate to operation of expanded bed, the dynamic absorption capacity for Cr3+is24.73mg/g, when the initial concentration of Cr3+is50mg/g at the flux50ml/min and the height of bed20cm. The saturated adsorbent can be desorbed by0.3M sulfuric acid solution, with a80%desorption rate for Cr3+. The reused batches were up to5. Treating Chrome Tanning effluent by the surface molecular imprinted adsorbent was studied. A new facilities of Chrome Tanning effluent treatment had been build in Xin ji of Hebei province. Combining expanded bed, aeration treatment and chemical sedimentation,500t/a wastewater could be treated by the new facilities. Through expanded bed treatment, the total Cr concentration of leather wastewater decreased less than l.Omg/L, the COD decreased to150mg/L and the SS decreased to15mg/L. the treated wastewater can be reused to soak and wash skins.