西藏地方材料对污水中氮磷的吸附性能

Adsorption performance of local materials in Tibet for nitrogen and phosphorous in sewage

以西藏地方特有的温泉石、铁矿渣、多孔透气砖为对象,研究其对污水中氨氮与磷的吸附性能,运用Freundlich和Langmuir两种方程对等温吸附试验结果进行拟合,3种材料对氨氮的吸附理论饱和吸附量G0由大到小的顺序为多孔透气砖、铁矿渣和温泉石,对磷素吸附的G0由大到小的顺序为多孔透气砖、铁矿渣和温泉石.基质吸附饱和后的解吸试验表明:多孔透气砖对氨氮吸附容量大,吸附性能好,且饱和后解吸量很小,铁矿渣和温泉石对氨氮吸附容量较小,但饱和后解吸百分比较低;多孔透气砖对磷吸附容量相对较大,铁矿渣居中,温泉石最小,饱和后解吸量及解吸百分比均较小;3种基质都存在氮磷解吸的现象,应用时应考虑其可能导致出水二次污染.

The adsorption performance of spring stone, iron slag and porous air brick from Tibet for ammonia nitrogen and phosphorus in sewage were investigated by experiments. Freundlich model and Langmuir model were used to fit adsorption isotherm equation experimental results. The results show that the decreased sequence of saturated adsorption capacity of Go for ammonia nitrogen is porous air brick, iron slag and spring stone, which is the same for phosphorus. The substrate adsorption saturation and latter precipitation experiments show that the ammonia nitrogen absorbance of porous air brick is large with high adsorption efficiency, and the precipitation quantity after saturation is low. The ammonia nitrogen capacities of iron slag and spring stone are low, while the precipitation percent after saturation is low. The decreased sequence of phosphorus adsorption capacity is porous air brick, iron slag and spring stone minimum, while the quantity and the percentum of precipitation after saturation are both low. The precipitation of ammonia nitrogen and phosphorus occurs in the three substrates, which may lead to secondary pollution of water body in actual application.