Abstract

Phosphorus is a nonrenewable resource, and the recovery of phosphorus from wastewater containing high concentrations of phosphorus is of great importance. In this work, a novel method for highly efficient treatment of high-concentration phosphorus-containing wastewater (50 mg/L, 100 mg/L and 150 mg/L) with low energy consumption was developed by using the block waste foam concrete (FC) as a potential phosphorus recovery material. The results showed that acid leaching significantly improved the accumulation efficiency of phosphorus in calcium hydroxyphosphate (HAP) via accelerating the release of calcium in wastewater. The recovery rate of phosphorus could reach 99.0% under the pH value of 9.0 at 25 °C, using 2.0 g FC. It was also found that the microporous structure of the surface of FC provided the adsorption sites for phosphorus, resulting in the adsorption rate in different concentrations of phosphorus-containing wastewater up to 14.5%. It indicated that FC achieved the recovery of phosphorus from high-concentration phosphorus-containing wastewater by coupling HAP crystallization and physical adsorption to polyphosphorus.

摘要

磷是一种不可再生资源，从高浓度磷废水中回收磷具有重要意义。本工作开发了一种利用块状废泡沫混凝土（FC ) 作为一种潜在的磷回收材料。结果表明，酸浸通过加速废水中钙的释放，显着提高了羟基磷酸钙（HAP）中磷的积累效率。使用2.0 g FC，在25 ℃、9.0 的pH 值下，磷的回收率可达99.0%。还发现FC表面的微孔结构为磷提供了吸附位点，从而使不同浓度含磷废水的吸附率高达14.5%。这表明FC通过HAP结晶和物理吸附对多磷的耦合实现了高浓度含磷废水中磷的回收。