沉淀-絮凝法强化废水中磷酸盐的去除

Journal of Science and Technology Issue on Information and Communications Technology Pub Date : 2021-12-31 DOI:10.31130/ud-jst2021-010e

H. Ho

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引用次数: 1

摘要

以CaO和Ca(OH)2为沉淀剂，制备了具有强胶凝特性的海藻酸、NaHCO3和CaCl2.2H2O环保型絮凝剂，用于辅助去除合成废水中的磷酸盐。通过批量实验考察了絮凝剂中各组分的重量比、絮凝剂用量和初始磷酸盐浓度对絮凝效果的影响。结果表明，在初始磷酸盐浓度为50 ~ 1000 ppm范围内，海藻酸:NaHCO3与CaCl2.2H2O的质量比为1:0.3:0.02，絮凝剂投加量为0.0050 g/25 mL时，絮凝效果良好。与未添加絮凝剂的样品相比，在初始磷酸盐浓度为50 ppm时，添加絮凝剂的CaO和Ca(OH)2对磷酸盐的去除率分别由19%和20%提高到97%。

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Enhanced removal of phosphate from wastewater by precipitation coupled with flocculation

Eco-friendly flocculants of alginic acid, NaHCO3 and CaCl2.2H2O with advantages of strong gelation characteristics were prepared for supporting the removal of phosphate in synthetic wastewater using CaO and Ca(OH)2 as precipitants. The effects of weight ratios of each component in flocculants, dosage of flocculants and initial phosphate concentration were investigated through batch of experiments. The results showed excellent flocculation performance with the weight ratio of alginic acid:NaHCO3 and CaCl2.2H2O at 1:0.3:0.02 and the dosage of flocculants at 0.0050 g/25 mL of phosphate solution in the range of initial phosphate concentration from 50 to 1000 ppm. Comparing to the sample without flocculants, the phosphate removal efficiency using CaO and Ca(OH)2 with the addition of flocculants increased from 19 and 20% to 97% at the initial phosphate concentration of 50 ppm, respectively by filtration of filter paper 2.7 μm.

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Journal of Science and Technology Issue on Information and Communications Technology

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