活性氧化铝过滤去除微量磷试验

通过试验研究了活性氧化铝过滤去除饮用水中微量磷和浊度的性能及出水生物稳定性.当进水ρ(TP)为35～45μg/L,浊度为3～6 NTU,测定活性氧化铝不同粒径、L/d_(10)值、pH值和滤速下的除磷、除浊性能,结果表明,当活性氧化铝粒径、L/d_(10)值和pH值过小或过大及滤速较大时,过滤性能均会降低,过滤效率指数也相对较大.当活性氧化铝粒径在0.71～1.25 mm、L/d_(10)=1 200、pH=6、滤速较小时,过滤效率指数最小,除磷除浊效果最优.在优化条件下,滤后出水ρ(TP)在16 h之内低于10μg/L,能达到生物稳定.

Experiment on Phosphorus Removal by Activated Alumina

The characteristics of activated alumina which is taken as filter media to remove phosphorus and turbidity in drinking water were studied,and the biological stability of effluent was analyzed.When total phosphorus concentration of effluent was in range of 35～45μg/L and turbidity was from 3 to 6 NTU, phosphorus and turbidity removal efficiency with different granula size of activated alumina,L/d_(10) value,pH value and filtration velocity was surveyed.The result showed that filtration performance would be worse with very higher or lower value of granula size,L/d_(10),pH and higher filtration velocity.Total phosphorus removal efficiency was up to peak value while granula size of activated alumina was in range of 0.71～1.25 mm,L/d_(10) 1 200,pH around 6 and filtration velocity was lower.On the optimal condition,the effluent could keep biological stability in 16 hours,when the concentration of total phosphorus was less than 10μg/L.