生物反应器及细菌快速氧化Fe^(2+)工艺研究

STUDY ON STRUCTURE OF INCUBATOR AND TECHNIQUE FOR QUICK OXIDATION OF Fe^(2+)BY BACTERIA

本文论述了生物反应器结构和细菌快速氧化亚铁的工艺。研究表明：研制的生物反应器结构合理，能有效富集细菌，并能快速氧化地浸吸附属液中的Fe^（2+）。将研制的生物反应器用于云南地侵现场，在外界不补加营养物质的条件下，每小时可氧化地侵返回液2.5m^3，氧化后电位达550mV以上，远远大于每升加0．4gH_2O_4氧化后的电位。用细菌氧化后的溶液与用H_2O_2氧化后的溶液进行现场抽往对比试验，其效果基本相同。用细菌代替H_2O_2作氧化剂，可使氧化剂费用降低70％。此外，细菌快速氧化亚铁工艺在难浸、污水处理等方面也有很好的应用前景。

The structure of incubator and the technique for quick oxidation of Fe2+by bacteria have been discussed in the paper. The results show that the structure of the incubator is reasonable and the incubator can effectively concentrate bacteria. The bacteria concentrated in the incubator can fast oxidate Fe2+in adsorbed raffinate from in-situ leaching field. The incubator, 1. 4 m3 of total effective volume,has been used at in-situ leaching mine in Yunnan province. Under the condition of natural environment without adding nutritious material,as well as the capacity of aeration is 150 L/min,The velocity of oxidating raff inate reaches to 2. 5 m3/h and the electric potential of oxidated solution is more than 550 mV, which is greater than that of solution made up of one litre adsorbed raffinate and 0. 4 g H2O2(about 500 mV). From the push-pull test conducted with bacteria and H2O2 in the field,it is found that the results of experiments are basicly same as these two oxidants. Therefore,it can be seen from this that bacteria can replace H2O2,and it can reduce oxidant costs by 70 percent,being simple and convenient to operate. In addition,the technique of quick oxidation of Fe2+ by bacteria will have a bright future in waste water processing,heap leaching,etc.