Study Of Antidotal Action On Anaerobic Residues For Polluted Soil By Chromium

Wastewater irrigation and the deposit of chromium residues during the course of chromate production have caused large farmland serious chromium pollution. The existing treatment measures for chromium pollution either costly or consume much manpower and material, which make it difficult to carry out the measures. In the paper, anaerobic fermentation residues were applied to the treatment of chromium pollution. Pot experiment and laboratory adsorption experiment were conducted to study the detoxification effect of the residues on chromium contaminated soil.The results indicated, under the condition of the same chromium concentration, the growth of vegetables and the remaining quantities of chromium of the group applied anaerobic fermentation residues were both better than the contrast. The output of cabbages averagely increased 66.2% and the remaining quantities of chromium maximally decreased 42.9%. Anaerobic fermentation residues influenced the form distribution of chromium in the soil. The proportions of soluble and exchangeable chromium quantities were decreased and those of sedimentary and residual chromium quantities were increased, which reduced the validity of chromium in the soil.Compared with the contrast, the chromium in the soil applied anaerobic fermentation residues maximally reduced 43.8%. Moreover, reductive quantity occupied large proportion among the whole reduction. Anaerobic fermentation residues had the strong capability to revert the chromimum with strong poison trait in the soil. After applying anaerobic fermentation residues to the soil contaminated with chromium, the mineralizing function of nitrogen and the adsorption of phosphor and potassium were influenced, which made the soil abilities of providing nitrogen, phosphor, potassium enhance by different degrees.