Edith Sebata, B. Nyamunda, N. P. Zinyama, Upenyu Guyo, M. Moyo
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引用次数: 0
摘要
以矿山固体废弃物(粉煤灰和铁泥)为混凝剂,研制出一种新型混凝剂(灰泥)。用x射线荧光(XRF)对粉煤灰和铁泥的化学成分进行了表征。在不同的pH值和吸附剂用量下,考察了混凝剂对水中天然有机物的去除效果,以及对水的总硬度、电导率和浊度的改善效果。混凝剂含有高含量的Al - 3+和Fe - 3+离子。与传统混凝剂明矾(55 mg / l -1)相比,灰污泥的最佳投加量(40 mg / l -1)较低。在最佳pH值为8时,灰渣污泥去除率为80.2%,明矾去除率为70.9%。在优化的pH和混凝剂用量下,明矾混凝水的总硬度(166 mg / l -1)高于灰污泥(155 mg / l -1)。与明矾相比,灰污泥在去除有机物质方面表现出良好的潜力,并使水的质量更好。
Removal of aqueous natural organic pollutants using mixed mining solid wastes: coal fly ash and iron sludge
A new coagulant (ash sludge) has been developed from a mixture of mining solid wastes (coal fly ash and iron sludge). The chemical composition of the coal fly ash and iron sludge was characterised by X-ray fluorescence (XRF). The effectiveness of the coagulant was tested on the removal of aqueous natural organic matter and its improvement on total hardness, conductivity and turbidity of water under different pH and adsorbent dosages. The coagulant contains a high composition of Al 3+ and Fe 3+ ions. Ash sludge uses a lower optimum dosage (40 mgL -1 ) compared to the conventional coagulant, alum (55 mgL -1 ). At optimum pH 8, ash sludge removed 80.2% of the aqueous natural organic matter while alum removed 70.9%. Under optimised pH and coagulant dosage, alum coagulated water showed a higher total hardness (166 mgL - 1 ) compared to ash sludge (155 mgL -1 ). Compared to alum, ash sludge exhibits an excellent potential in the removal of organic materials and gives water with better qualities.