饮用水源突发挥发酚污染应急处理中试研究

通过为期2个月规模为4m3·h-1的中试试验,考察了常规给水工艺(混凝、沉淀和过滤)对突发挥发酚污染原水的处理情况.重点考察了活性炭吸附、臭氧预氧化和高锰酸钾预氧化等3种应急工艺的除酚效能.结果表明,常规混凝沉淀对挥发酚的去除率低于10%,砂滤在12h内可起到拦截挥发酚的作用,3种应急工艺均可提高挥发酚的去除效果,起到应急的作用.其中活性炭吸附对挥发酚的去除率可达44%;在0.5mg·L-1的投量下高锰酸钾预氧化可达到50%的除酚效率;臭氧预氧化可使沉淀出水挥发酚达标(0.002mg·L-1),挥发酚去除率约99%.

Pilot study on emergent treatments of raw water suddenly polluted by phenols

The removal of phenol after normal water treatment processes (coagulation, precipitation and filtration) and emergent treatment processes such as adsorption by activated carbon were compared in a 2 month pilot study treating 4 m3·h-1 of raw wastewater. Pre-oxidation by ozone and potassium permanganate were employed when phenol pollution occurred suddenly in the raw water. The pilot results show that the removal efficiency of phenol treated by normal coagulation and precipitation was less than 10%. Sand filtration could prevent contamination for 12 hours. Three emergent treatment processes enhanced the removal of phenol. The removal efficiency of phenol adsorbed by activated carbon was up to 44% while 50% was removed by pre-oxidation with potassium permanganate (0.5 mg·L-1). The precipitated effluent reached the accepted standard (0.002 mg·L-1) after a pre-ozonation process in which the removal efficiency of phenol was nearly 90%.