铁炉渣在稻田水磷去除中的应用

Application of Iron Slag in Water Phosphorus Removal in Paddy Fields

为了阐明铁炉渣对稻田水磷去除的有效性及机制,在介绍了铁炉渣磷去除技术的基础上,重点以福州平原稻田为研究区域,采用原位采样与室内分析法测定并分析了铁炉渣施加对稻田水磷的影响,并探讨了铁炉渣施加对稻田水磷去除的有效性。结果表明,施加铁炉渣可有效地去除稻田水中的磷元素,并随着铁炉渣施加浓度从2 Mg/hm2增加到8 Mg/hm2,其对稻田水磷的去除效率逐渐增强。从水稻生长季平均去除效率看,8 Mg/hm2铁炉渣施加对稻田水磷的去除效率为27.8%;从时间变化来看,铁炉渣施加在磷含量出现峰值时对稻田水磷的去除效率最为明显;除了铁炉渣的物质组成和多孔结构调节稻田水磷去除效率外,pH和温度的变化也在控制铁炉渣施加对稻田水磷去除的效率上起着重要作用。研究成果可为施加铁炉渣去除磷技术在稻田水磷去除研究中的广泛应用提供实验和理论依据。

The research of agricultural pollution is the focus and iron slag is the common substrate which contains abundant active matter and lacunaris structure for the research of phosphorus removal. To clarify the validity of the iron slag phosphorus removal technique application, the iron slag phosphorus removal technique was introduced, the phosphorus removal was measured and the validity of iron slag application in phosphorus removal research was analyzed in the paddy fields of Fuzhou plain. The results showed that iron slag could reduce phosphorus. Phosphorus was decreased as iron slag concentration increased from 2 Mg/hm2 to 8 Mg/hm2. The average phosphorus removed by 8 Mg/hm2 in the rice field was 27. 8%. The change of pH and temperature may be another main factor controlling phosphorus removal besides active matter and lacunaris structure in paddy fields. This paper can provide experimental and theoretical basis for the widely application of the phosphorus removal technique.