连续流催化臭氧氧化控制溴酸盐生成的效能

Effect of Catalytic Ozonation with Supported Cerium Oxide on Minimizing Bromate Formation in Continuous Flow Mode

考察了以滤后水为本底的连续流体系中,CeO2催化氧化抑制BrO3-副产物生成的效能.发现存在NOM的情况下,连续流O3/CeO2控制BrO3-生成的优势仍很明显.分别考察了连续流运行状况下,不同的臭氧质量浓度、Br-质量浓度及接触氧化停留时间对O3/CeO2控制BrO3-生成量的影响.结果表明,在不同反应条件下,O3/CeO2都能明显控制BrO3-的生成.高臭氧投量(5,mg/L)下,O3/CeO2氧化抑制BrO3-生成量的优势更明显,比单独臭氧氧化后的降低了73.8%.本实验所采用的Br-质量浓度范围(0～3,mg/L)内,实际水体中Br-质量浓度的升高并不会减弱O3/CeO2抑制BrO3-生成量的优势.延长接触氧化的停留时间到9.8,min会使得O3/CeO2抑制BrO3-生成的效能更高,建议实际生产中采用10,min左右的停留时间为宜.

The aim of the work was to investigate the bromate minimization during the supported cerium oxide- catalyzed ozonation （O3/CEO2） of bromide-containing filtered surface water in continuous flow mode （CFM）. Results indicated that the advantage of O3/CEO2 oxidation on minimizing bromate was still significant when NOM is present in CFM. Ozone dosage, bromide concentration and contact time were further studied for their effect on minimizing bromate during O3/CEO2 oxidation in CFM. Results showed that O3/CEO2 oxidation could significantly reduce bromate formation at all conditions applied in this experiment. Under high ozone dosage （5 mg/L）, O3/CEO2 oxidation caused a significant reduction of 73.8% for bromate concentration, compared with ozonation alone. Higher bromide concentration of the filtered water did not weaken the efficiency of O3/CEO2 on minimizing bromate with the bromide concentration ranging from 0 to 3 mg/L in this work. The OJCeO2 oxidation would achieve higher efficiency on bromate minimization as the contact time extended to 9.8 min, and it was proposed that the contact time should be about 10 min in practice.