利用制糖副产物土壤化赤泥的效果

赤泥因具有碱性高、孔隙率低、团聚性差和养分缺乏等问题，同时因其生产性状差，堆场植被复垦难以实现；而且在堆存过程中，重金属元素具有潜在的长期浸出性，存在污染环境的风险。利用富含多种有机成分且蓬松度好的制糖副产物酒精废醪液、蔗渣对赤泥进行改性，可实现土壤化及植被复垦。结果表明，添加制糖副产物对赤泥理化性质及所含重金属迁移性具有显著影响，蔗渣能使孔隙度得到改善，酒精废醪液与赤泥比值（mL:g）＞3时，赤泥的pH可降至8以下，配合添加酒精废醪液和蔗渣可使赤泥的有机质含量从（19.8±1.2）g·kg-1增加到200 g·kg-1左右，经土柱模拟实验发现添加剂可使赤泥所含重金属的生物有效性增强。

Effect of soil-conversion red mud by using sugar by-products

Due to the property of high alkaline, low porosity, poor agglomeration, lack of nutrients, and also poor in production, red mud is hard to be rehabilitated in the yard. Additionally, red mud has the long-term leaching potential of heavy metals in the storage process, causing high environmental pollution risk. The work tends to modify red mud into soil and vegetation restoration by using the sugar by-products, alcohol waste mash and bagasse, which are rich in various organic components and good fluffiness.The results show that the addition of sugar by-products has a significant effect on the physical and chemical properties of red mud and the mobility of heavy metals,the porosity can be improved.When ratio of alcohol waste liquid and red mud (mL:g) was more than 3, the pH of the red mud was reduced to 8, and the organic content of red mud increased from (19.8±1.2)g·kg-1 to 200 g·kg-1 with the additives. By the soil column simulation experiment, the results confirm that the additive can enhance the bioavailability of heavy metals in red mud.