(1. 南華大學(xué) 污染控制與資源化技術(shù)湖南省重點實驗室，衡陽 421001；
2. 南華大學(xué) 鈾礦冶生物技術(shù)國防重點學(xué)科實驗室，衡陽 421001)
摘 要: 探討U(Ⅵ)初始濃度、COD、SO42-、Cu2+、Fe0等對硫酸鹽還原菌顆粒污泥(SRBGS)去除U(Ⅵ)的影響，討論其去除U(Ⅵ)的穩(wěn)定性，并利用XPS分析U(Ⅵ)還原產(chǎn)物的形態(tài)特征。結(jié)果表明：當(dāng)COD為300~1500 mg/L時，隨著COD濃度的升高，U(Ⅵ)的去除速率加快；SO42-濃度低于1500 mg/L對U(Ⅵ)的去除有促進作用；Cu2+濃度低于100 mg/L時，U(Ⅵ)還原未受顯著影響，但當(dāng)其增至200 mg/L時，U(Ⅵ)還原受到完全抑制；投加鐵粉大大提高了U(Ⅵ)的去除速率，20 h內(nèi)，U(Ⅵ)的去除率達到100%。SRB顆粒污泥能夠長期使用，最佳水力停留時間12.5 h，NO3-能使已還原的U(Ⅵ)再氧化。XPS分析表明，顆粒污泥表面沉積或吸附了鈾，且以U(Ⅳ)為主。
關(guān)鍵字: SRB顆粒污泥；U(Ⅵ)；影響因素；穩(wěn)定性
（1. Hunan Provincial Key Laboratory of Pollution Control and Resources Technology, University of South China,
Hengyang 421001, China;
2. Key Discipline Laboratory of National Defence for Biotechnology in Uranium Mining and Hydrometallurgy,
University of South China, Hengyang 421001, China）
Abstract:The effect of initial U(Ⅵ) concentration, COD, SO42-, Cu2+ and Fe0 on U(Ⅵ) removal by sulfate reducing bacteria granular sludge (SRBGS) for U(Ⅵ) removal was investigated. The removal stability was analyzed, then the deposit valence of uranium was studied. The results show that U(Ⅵ) reduction prefers a higher COD and SO42- concentration at the range of 300-1500 mg/L. U(Ⅵ) removal is accelerated with increasing COD concentration and can be promoted when SO42- concentration is less than 1500 mg/L. The existing of Cu2+ do not affect U(Ⅵ) removal appreciably when its concentration is less than 100 mg/L, but U(Ⅵ) removal can not be inhibited completely while its concentration reaches 200 mg/L. Adding iron greatly improves U(Ⅵ) removal rate, U(Ⅵ) removal rate reaches 100% within 20 h. The SRBGS sludge can be long-term used, and the optimal hydraulic stay time(HRT) is 12.5 h. U(Ⅵ) can be reoxidized by NO3-. XPS analysis results indicate that the deposition of U element on SRBGS in main valence of U(Ⅳ).
Key words: sulfate reducing granular sludge; U(Ⅵ); influencing factor; stability
