摘要
毒砂的氧化作用会产生富含As的酸性矿山废水(AMD)引起了广泛关注,但p H和Fe2+离子对毒砂生物氧化作用的影响还不清楚。利用从大宝山AMD培养得到的氧化亚铁硫杆菌(A.f.)和毒砂进行初始p H2.00、p H3.00和p H3.50为期30 d的不含Fe培养基有菌氧化、含Fe培养基无菌氧化和含Fe培养基有菌氧化实验,通过测定实验过程溶液的总As离子、Fe2+含量和p H值,获得如下结论:1不含Fe培养基有菌氧化过程,初始p H越低,实验结果溶液As离子质量浓度越高,初始p H2.00比初始p H3.50的溶液中As离子质量浓度要高大约15倍,即低p H可促进毒砂的微生物氧化作用。2含Fe培养基会使毒砂生物氧化过程p H保持在4.0以下进行,促进毒砂氧化,提高释放的As离子质量浓度。在AMD中加入一定的碱性物质来提到p H值,可降低Fe2+质量浓度,抑制毒砂的生物氧化作用,降低As离子的含量。
Many studies focus on the oxidation of arsenopyrite which results in the formation of acid mine drainage （AMD）rich of As,but effects of pH and Fe2＋on arsenopyrite bio-oxidation are rarely availa-ble .A strain of Acidithiobacillus ferrooxidans （A.f.）isolated from the AMD of Dabaoshan and a mineral arsenopyrite were used to study the bio-oxidation of arsenopyrite.Experiments were designed to compare the difference between abiotic oxidation and bio-oxidation of arsenopyrite in pH2.00,3.00 and 3.50 with or without additional Fe2＋conditions in a period of 30 days.The concentrations of As ion,Fe2＋and pH values during the experiments were determined The results showed the lower original pH value the higher concentration of As ion in the result solution of bio-oxidation without additional Fe2＋.The concentration of As ion in the result solution of the original pH2.00 is about 15 times of that in the original pH3.50.A lower pH value can accelerate the bio-oxidation of arsenopyrite.The additional Fe2＋can keep the pH val-ue of bio-oxidation solution in a condition of lower than 4.00,which promotes the bio-oxidation of the ar-senopyrite and concentration of As ion in the result solution.The results indicate that adding some alka-line substances in the acid mine drainage to increase its pH value can reduce its Fe2＋concentration,de-crease the bio-oxidation rate of arsenopyrite and reduce the concentration of As ions.
出处
《中山大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第6期73-77,共5页
Acta Scientiarum Naturalium Universitatis Sunyatseni
基金
国家自然科学基金资助项目(41373079)
关键词
氧化亚铁硫杆菌
毒砂
氧化作用
酸性矿山废水
Acidithiobacillus ferrooxidans
arsenopyrite
oxidation
acid main drainage
