本文關鍵詞：醋渣和糠醛渣對赤泥中金屬穩(wěn)定性的影響　出處：《環(huán)境科學研究》2016年12期 　論文類型：期刊論文

  更多相關文章： 赤泥 醋渣 糠醛渣 金屬穩(wěn)定性 MEP(多級提取程序)

【摘要】：赤泥中和是實現(xiàn)堆場植被復墾的必要途徑,而醋渣和糠醛渣是赤泥降堿和改良效果較好的2種生物質材料.針對赤泥堿性降低過程中理化性質的改變,根據(jù)MEP(多級提取程序)毒性溶出以及BCR形態(tài)分級試驗,對醋渣和糠醛渣對赤泥中金屬行為的影響進行了研究.結果表明:添加20%的醋渣和糠醛渣后,赤泥pH從10.60分別降至9.61和8.96,w(TOC)從8.04 g/kg分別增至35.11和38.62 g/kg,赤泥比表面積從10.18 m2/g分別降至7.36和8.57 m2/g,CEC(陽離子交換量)從106.28 cmol/kg分別增至127.19和161.59 cmol/kg;赤泥中Mo的最低浸出濃度為0.37 mg/L,超過GB/T 14848—1993《地下水質量標準》中Mo的Ⅲ類標準限值(0.1 mg/L);醋渣和糠醛渣可有效抑制赤泥中Al、V、Pb的浸出,但卻可促進Cu、Mn、Ni和Mo的浸出,四者的最高浸出濃度分別可達64.45、17.64、12.09μg/L和29.37 mg/L;醋渣和糠醛渣的添加可導致Al、V和Pb向穩(wěn)定性較高的殘渣態(tài)轉化,Ni則向穩(wěn)定性較低的酸可提取態(tài)轉化.研究顯示,糠醛渣比醋渣有更強的中和能力,對赤泥中金屬穩(wěn)定性影響較小.赤泥中金屬元素具有潛在的長期浸出性且環(huán)境風險較高.
[Abstract]:Red mud neutralization is a necessary way to realize vegetation reclamation in the yard, and vinegar slag and furfural slag are two kinds of biomass materials with better effect of reducing alkali and improving red mud. The change of physical and chemical properties in the process of reducing red mud alkalinity is discussed. According to MEP (multistage extraction procedure) toxicity dissolution and BCR morphological classification test. The effects of vinegar slag and furfural slag on metal behavior in red mud were studied. The results showed that the pH of red mud decreased from 10.60 to 9.61 and 8.96 after adding 20% of vinegar slag and furfural slag. The number of WTC increased from 8.04 g / kg to 35.11 and 38.62 g / kg, respectively. The specific surface area of red mud decreased from 10.18 m2 / g to 7.36 and 8.57 m2 / g, respectively. CEC (cationic exchange capacity) increased from 106.28 cmol/kg to 127.19 and 161.59 cmol / kg, respectively. The lowest leaching concentration of Mo in red mud is 0.37 mg 路L ~ (-1), which exceeds the class 鈪，

本文編號：1364171