高铁酸钾对水中藻类及其次生嗅味污染物二甲基三硫醚同步去除研究

Simultaneous Removal of Algae and Its Odorous Metabolite Dimethyl Trisulfide in Water by Potassium Ferrate

模拟高藻期碱性水源水,采用高铁酸钾对水中以颤藻和二甲基三硫醚为代表的藻类及微量嗅味污染物进行同步控制研究.在高铁酸钾与聚合氯化铁(PFC)单独混凝对藻类的控制效果对比的基础上,展开了高铁酸钾与高锰酸钾预氧化-PFC联用方法对藻类及嗅味污染物的控制效果对比,探讨了pH、预氧化时间和浊度等条件对控制效果的影响.结果表明,PFC单独混凝除藻率最高为90.6%,以Fe计的等量投加条件下,高铁酸钾控藻效果较PFC混凝好,除藻率可达92.4%.高锰酸钾对PFC具有强化混凝效果,可明显提高除藻率(94.5%).高铁酸钾较高锰酸钾预氧化对二甲基三硫醚的去除效果理想,且氧化时间大大缩短,高铁酸钾氧化时间1 min可去除92.5%二甲基三硫醚,高于高锰酸钾预氧化10 min后达到的去除率(74.6%).

Co-removal of oscillatoria algae and its potential odorous metabolite dimethyl trisulfide（DMTS） in simulated algae-laden alkaline source water by potassium ferrate（K2FeO4） was investigated in contrast to potassium permanganate（KMnO4） pre-oxidation followed by polyferric chloride（PFC） under varying conditions,including pH,initial oxidant dosage and turbidity.Based on the pre-comparison with PFC,the optimal dosage of PFC in the combined KMnO4 pre-oxidation-PFC treatment was determined.Potassium ferrate resulted in 92.4% removal of algae,higher than PFC when the dosage was equivalent as measured by Fe and KMnO4 showed obviously positive effect as a coagulation aid.Degradation of dimethyl trisufide（92.5%） by potassium ferrate was better than the pre-oxidation of potassium permanganate（74.6%）,and the treatment time was decreased from 10 min to 1 min.