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研究了O3及O3/H2O2工艺在低温和常温条件下对实际水体中痕量阿特拉津的去除规律。结果表明:低温(5℃)条件下,O3分解相当缓慢,单独O3氧化工艺对阿特拉津的去除能力有限,而O3/H2O2工艺优势明显;常温(25℃)条件下,O3分解较快,单独O3氧化工艺就能有效降解阿特拉津,O3/H2O2工艺优势较弱。理论分析认为,O3完全分解条件下产生的羟基自由基的CT值与O3投量相关,而与H2O2投量无关。因此,H2O2投量应使O3在氧化接触时间内恰好完全分解为最佳,可以用剩余臭氧浓度作为指示参数来控制H2O2的投加。
The removal of trace amounts of atrazine in water by O3 and O3 / H2O2 processes at low temperature and normal temperature was studied. The results showed that the decomposition of O3 was slow at low temperature (5 ℃), the removal of atrazine by O3 oxidation process was limited, while the O3 / H2O2 process had obvious advantages. Under normal temperature (25 ℃), O3 decomposed faster , O3 oxidation process alone can effectively degrade atrazine, O3 / H2O2 process has a weak advantage. The theoretical analysis shows that the CT value of hydroxyl radical produced under O3 complete decomposition is related to O3 dosage, but not with the dosage of H2O2. Therefore, the dosage of H2O2 should make O3 completely decompose into the best during the oxidation contact time, and the remaining ozone concentration can be used as an indicator to control the dosage of H2O2.