粉煤灰负载壳聚糖去除水中低浓度磷的研究

Research on the Treatment of Phosphorus-Containing Wastewater by Fly Ash-chitosan Adsorbent

磷是富营养化限制因子,同时,中国主要能源是煤,每年会产生大量的粉煤灰废弃物;壳聚糖广泛存在于自然界,在水处理中的应用前景广阔。利用粉煤灰负载壳聚糖处理水中的磷既可以减少水中的污染物质,成本低,耗能少,又可以使固体废物得到有效的利用。实验中,以粉煤灰负载壳聚糖作为吸附剂,对磷酸盐的吸附进行了实验研究。讨论了废水的pH值、吸附平衡时间、吸附剂的投加量和吸附温度等各个因素对磷酸盐去除率的影响。研究表明:在粉煤灰负载壳聚糖的投加量为6 g/L、废水浓度为3 mg/L、吸附温度为30℃、吸附时间为30 min的条件下,P的去除率可达90%左右。

Phosphorus is the limiting faetor for eutrophieation, at the same time, coal is the primary energy in our＇country, so produce large amounts of fly ash per year; ehitosan exists widely in nature, and apphcated widely in water treatment. Fly ash - ehitosan adsorbent can not only reduce pollutants in water, low eost, low energy consumption, but also make solid waste can be used effectively. A kind of adsorbent is made by coating ehitosan on the surface of fly ash, the adsorptivity toward P from aqueous solution is studied. The main faetors, such as pH value, adding quantity of adsorbent, were diseussed to the removal effieieney of P. Further more, the optimal experiment condition has been defined. The results of the test show ： when the adding quantity of adsorbent fly ash is 6 g/L, temperature and time of adsorption are separately 30℃ and 30 rain, the removal efficiency of P can reach about 90%.