Bioleaching of heavy metal-contaminated sediments by indigenous Thiobacillus spp: metal solubilization and sulfur oxidation in the presence of surfactants
Bioleaching of heavy metal-contaminated sediments by indigenous Thiobacillus spp: metal solubilization and sulfur oxidation in the presence of surfactants
复制标题
本土硫杆菌对重金属污染沉积物的生物浸出：表面活性剂存在下的金属溶解和硫氧化
DOI：
10.1007/s002530000465
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发表时间：
2000
影响因子：
5
通讯作者：
P. Hoffmann
中科院分区：
文献类型：
--
作者：
H. Seidel;J. Ondruschka;P. Morgenstern;R. Wennrich;P. Hoffmann
在悬浮浸出实验中，研究了表面活性剂应用于改善或抑制重金属污染沉积物的生物浸出过程中金属溶解和硫氧化动力学的效率。所用的河流沉积物含有大量的细颗粒和有机物。测试了三种类型的表面活性剂：十二烷基硫酸钠（SDS）、C12/14-烷醇乙氧基化物（Präwozell F1214/5 N）和三聚硫（Netz-schwefel 80 WP）。添加10 mmol SDS/l导致酸化、金属增溶和硫氧化的瞬时抑制。抑制生物沥滤仅14天就需要比用于矿山废物缓解的SDS多10倍的SDS。使用Präwozell的抑制效果较差;使用Na 2SO 4的浸出效率没有提高。这些表面活性剂的大部分在应用时立即吸附到固体颗粒上，而水相中的其余部分在几天内消失。
The efficiency of surfactant application to improve or inhibit metal solubilization and sulfur oxidation kinetics during the bioleaching of heavy metal-contaminated sediments was studied in suspension-leaching experiments. The river sediment used contained large amounts of fine particles and organic matter. Three types of surfactants were tested: sodium dodecylsulfate (SDS), a C12/14-alkanolethoxylate (Präwozell F1214/5N), and a wettable sulfur (Netz- schwefel 80 WP). Adding 10 mmol SDS/l led to transient inhibition of acidification, metal solubilization and sulfur oxidation. Inhibiting bioleaching for just 14 days required about ten times more SDS than the amount used for mine waste mitigation. The use of Präwozell resulted in poor inhibition; and using of wettable sulfur did not improve leaching efficiency. The bulk of these surfactants was sorbed onto the solid particles immediately on application, while the remainder in the aqueous phase disappeared within a few days.