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首页> 外文会议>Global Symposium on Recycling, Waste Treatment and Clean Technology; 20040926-29; Madrid(ES) >BIOREMEDIATION OF POLLUTED WATERS IN A URANIUM DEPOSIT
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BIOREMEDIATION OF POLLUTED WATERS IN A URANIUM DEPOSIT

机译：铀矿床中污染水的生物修复

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摘要

Acid waters in a uranium deposit located in western Bulgaria were treated by means of a natural wetland located in the deposit. The waters had a pH in the range of about 5.5.-6.8 and contained uranium, radium, manganese and sulphates as pollutants. The wetland was characterized by an abundant water and emergent vegetation and a diverse microflora. Typha latifolia and Phragmites australis were the main plant species in the wetland but Typha angustifolia and species related to the genera Juncus, Scirpus, Eleocharis, Carex, and Poa as well as different algae were also well present. The watercourse through the wetland covered a distance of about 80 m and the water flow rate varied in the range of about 0.2 - 1.0 1/s.An efficient removal of the pollutants was achieved during the different climatic seasons, even in the cold winter months at water temperatures close to 0℃. The removal was connected with different processes but the microbial dissimilatory sulphate reduction and the sorption of pollutants by the living and dead plant and microbial biomass and by the clay minerals present in the wetland played the main role. However, a significant portion of manganese was removed as a result of the prior bacterial oxidation of Mn~(2+) to Mn~(4+), followed by precipitation as MnO_2. Negative effects of the pollutants on the plant and microbial communities in the wetland were not observed.
机译：位于保加利亚西部的铀矿床中的酸性水通过位于矿床中的天然湿地进行处理。这些水的pH在大约5.5.-6.8的范围内，并且包含铀，镭，锰和硫酸盐作为污染物。湿地的特点是水量充沛，植被萌生，微生物群落多种多样。香蒲和湿地芦苇是湿地中的主要植物物种，但也存在香蒲和与Juncus，Scirpus，Eleocharis，Carex和Poa属有关的物种以及不同的藻类。穿过湿地的水道覆盖了约80 m的距离，水流量在约0.2-1.0 1 / s的范围内变化。即使在寒冷的冬季，在不同的气候季节也能有效去除污染物在接近0℃的水温下。清除过程与不同的过程有关，但是微生物的异化硫酸盐还原以及生，死植物和微生物生物量以及湿地中存在的粘土矿物对污染物的吸附起着主要作用。然而，由于先前细菌将Mn〜（2+）氧化为Mn〜（4+），随后以MnO_2的形式沉淀，因此去除了大部分锰。没有观察到污染物对湿地植物和微生物群落的负面影响。

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