| CaO2@FA复合材料富集磷效能及其回收物对土壤改良作用 |
| 摘要点击 1690 全文点击 528 投稿时间：2021-12-20 修订日期：2022-02-23 |
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| 中文关键词 过氧化钙 粉煤灰 磷酸盐 生活污水 土壤改良剂 |
| 英文关键词 calcium peroxide fly ash phosphate domestic sewage soil conditioner |
| 作者 | 单位 | E-mail | | 岳薇 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | 1039784823@qq.com | | 李大鹏 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | ustsldp@163.com | | 吴玲予 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | | | 王璐 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | | | 汤尧禹 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | | | 朱企 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | | | 黄勇 | 苏州科技大学环境科学与工程学院, 苏州 215009
苏州科技大学环境生物技术研究所, 苏州 215009 | |
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| 中文摘要 |
| 为实现污水中磷和工业废弃物粉煤灰的资源化利用，通过表面沉淀法将纳米CaO2负载于粉煤灰（FA）表面以及孔隙中，制备出一种高效除磷的复合材料（CaO2@FA）.结果表明，粉煤灰表面负载CaO2后，其具有更大的比表面积和孔隙率，比表面积增加至4.641 m2 ·g-1，总孔容增大至0.025 cm3 ·g-1；CaO2@FA对磷的吸附过程符合Langmuir等温吸附模型，其最大吸附容量为185.776 mg ·g-1（20℃），吸附机制为化学沉淀，主要是形成羟基磷酸钙.CaO2@FA复合材料对磷的富集效率显著高于粉煤灰，并随着投加量增加，对磷的富集效率增加.共存离子中HCO3-和CO32-对复合材料吸附磷有一定的负面作用.当CaO2@FA复合材料投加量为2.0 g ·L-1时，对生活污水中磷的富集率可达93%，回收沉淀物中的有效磷含量达到1.658 mg ·g-1.土壤改良实验表明，加入回收的沉淀物可使土壤中有效磷含量增加102.9%，该复合材料回收100 mg磷酸盐的运行成本则低至0.76元. |
| 英文摘要 |
| To explore the resource utilization of phosphorus (P) in wastewater and industrial waste fly ash, we used an efficient composite material (CaO2@FA) for phosphorus removal by loading nano-CaO2 on the surface of fly ash as well as in the pores using the surface precipitation method. The results showed that the material had a larger specific surface area and porosity after loading CaO2 on the fly ash surface. The specific surface area increased to 4.641 m2·g-1, and the total pore volume was up to 0.025 cm3·g-1. The adsorption process of CaO2@FA on P could be described using the Langmuir isothermal adsorption model, and its maximum adsorption capacity was 185.776 mg·g-1(20℃). The adsorption mechanism was attributed to chemical precipitation, mainly the formation of calcium hydroxyphosphate. The enrichment efficiency of CaO2@FA composites on P was significantly higher than that of fly ash, and the efficiency was increasing with the increase in the dosage added. HCO3- and CO32- in the coexisting ions had a negative effect on P adsorption by the composites. The enrichment rate of P in domestic wastewater was up to 93% when the dosage of CaO2@FA composites was 2.0 g·L-1. The content of biological P in the recovered precipitates reached 1.658 mg·g-1. The soil improvement test showed that the biological P content in soil increased by 102.9% when the recovered precipitates were added into the soil. This indicated that the operating cost of recovering 100 mg of P by this composite was as low as 0.76 yuan. |
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