赤泥在控制沉积物磷释放中的应用研究
Study on using red mud to control phosphorus release in sediment
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摘要: 利用烧结法赤泥中富含Ca、Fe等金属元素的氧化物而具有吸附性的特点，通过室内模拟研究赤泥投加对沉积物中各种磷形态含量及分布比例的影响，进而探讨利用赤泥控制沉积物中磷释放的可行性。对经过处理后的沉积物磷形态分析后表明，投加赤泥能促使沉积物中铁铝磷向钙磷转化（Pearson相关分析，r=-0.892，Pn=9），且赤泥的强碱性使沉积物pH值逐渐升高。确定了赤泥最佳投加比例为5%，此时沉积物的pH为9.03，铁铝磷含量由初始的148 mg/kg降至107 mg/kg，占总磷比例也由18.1%降至13.4%，钙磷含量由486 mg/kg升至546 mg/kg，其占总磷比例则由60%增至68.7%，铁铝磷和钙磷之间的转化已基本完成，继续增加赤泥投加量对沉积物中磷形态间的相互转化影响甚微。由于铁铝磷较钙磷活性高而易释放，可见投加赤泥能降低沉积物中磷的释放风险。赤泥可以作为吸附材料被应用于沉积物磷污染控制技术中，为有效控制水体内源磷负荷提供一种新思路和廉价材料。Abstract: Sintered red mud has adsorption capacity due to its high in Ca and Fe oxides. The effects of applied red mud on sediment phosphorus release was studied by Lab simulations. The variation of phosphorus forms in treated sediment samples was analyzed, the results showed that adding red mud can facilitate the Fe/Al-P in sediment translating to the Ca-P (Pearson correlation analysis, r=-0.892，Pn=9）,it also increase the sediments pH value. The most appropriate proportion of red mud application is 5%,under this condition, the sediment pH is 9.03, the content of Fe/Al-P in sediment drops from 148 mg/kg to 107 mg/kg and the occupation of total phosphorus decreases from 18.1% to 13.4%,at the same time, the content of Ca-P increases from 486 mg/kg to 546 mg/kg and the proportion of total phosphorus increases from 60% to 68.7%, the transformation between Fe/Al-P and Ca-p is almost completed . Compared to the Fe/Al-P, Ca-P has a lower release risk to overlying water, so red mud can reduce the risk of phosphorus release in sediments and be used in situ controlling sediment internal phosphorus release as a new and cheap material.
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Key words:
- red mud /
- sediment /
- phosphorus release /
- phosphorus form
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