生物慢滤降解微污染水中半挥发性有机物的实验研究

Study on the Treatment of Semi Volatile Organic Compounds (SVOC) in Micro-polluted Raw Water by Slow Sand Filtration

文章研究了生物慢滤技术处理微污染水中半挥发性有机物(以敌敌畏、乐果、蒽、菲为例)。当慢滤反应器表面形成成熟稳定的生物粘膜后,分别进行敌敌畏、乐果、蒽、菲的试验研究。实验结果表明,当原水中的敌敌畏、乐果、蒽或菲的浓度约为1.00μg/L时,生物慢滤反应器运行2 d后,对敌敌畏、乐果的去除率稳定在80%左右,运行3 d后,对蒽、菲的去除率稳定在80%左右;生物慢滤反应器对敌敌畏、乐果、蒽、菲的去除率基本不受原水浓度的影响,原水浓度高达10.00μg/L时,生物慢滤反应器出水仍能降至0.1μg/L以下,去除率超过70%,能够满足生活饮用水卫生标准(GB 5749-2006)的要求;慢滤反应器的滤料高度对敌敌畏、乐果、蒽、菲的去除效果有一定的影响,但反应器对该有机物的去除主要发生在填料上部30 cm高度内。

A study on the treatment of the semi volatile organic compounds(SVOC) in micro-polluted raw water by slow sand filtration,taking the dichlorvos,dimethoate,anthracene and phenanthrene for example.When the removal rate of the turbidity,ammonia and nitrogen is stable,the slow sand filtration is thought to be in the status of dynamic balance,in which status the experimental study of SVOC degradation is carried on.The results show that,in the status of dynamic balance,the reactors need 2 days to have a stable removal rate for the same concentration(1.00 μg/L) of dichlorvos and dimethoate,while 3 days of anthracene and phenanthrene;The different concentration SVOC(0.10～10.00 μg/L) of raw water can be treated to be a low level and the removal ratio is above 70% by the reactor of slow sand filtration,then it can meet the requirements of the sanitary standard limit for drinking water(GB 5749-2006);The height of the reactor has some influence to the removal of the SVOC,but the main point is in the above 30 cm of the filler.