UV/H2O2工艺降解微囊藻毒素-LR

采用UV/H₂O₂联合工艺，研究了光强、初始浓度、H₂O₂投加量、pH及阴离子对微囊藻毒素-LR (MC-LR)去除率的影响.结果表明，单独H₂O₂对MC-LR基本无去除效果；单独UV工艺可以一定程度上降解MC-LR；而UV/H₂O₂联合工艺由于发生协同作用明显提高降解效率.试验发现，随着光强的增大，MC-LR的去除率不断提高；随着MC-LR初始浓度的增大，其去除率不断降低；随着H₂O₂投加量的增大，降解速率常数逐渐增大，当H₂O₂投加量由1 mmol/L增大到3 mmol/L时，降解速率常数由0.084 4上升到0.166 4；当pH为3.13时，在相同条件下MC-LR的去除效果最好；阴离子的投加不利于MC-LR的降解，其中CO^2-₃、NO^-₃影响最大.

Degradation of MC-LR by Combination of UV/H2O2 Process

The degradation of MC-LR in water by UV/H₂O₂ process was investigated. The effects of intensity of UV radiation, initial concentration of MC-LR, dosages of H₂O₂, initial pH value and anions on degradation of MC-LR by UV/H₂O₂ process were studied. The results show that the removal of MC-LR only by H₂O₂ is nearly zero, and UV process can degrade MC-LR to a certain extent. However, the degradation efficiency of UV/H₂O₂ process is much higher than UV and H₂O₂ process due to the synergetic effect between UV and H₂O₂. The removal of MC-LR increases with the enhancement of intensity of UV radiation, but decreases gradually with the increase of initial concentration of MC-LR. When the dosages of H₂O₂ change from 1 mmol/L to 3 mmol/L, the constant of degradation rate rises from 0.084 4 to 0.166 4. The optimum pH value is 3.13. The added anions have adverse effect on the degradation of MC-LR, especially carbonate and nitrate ions have the biggest influence among the studied anions.