硫酸盐生物还原体系的主要影响因素研究

MAIN INFLUENTIAL FACTORS OF BIOLOGICAL SULFATE REDUCTION SYSTEM

利用间歇式完全混合厌氧生物反应器对硫酸盐生物还原体系中的主要影响因素如反应温度、初始pH值和COD/SO42-值进行了实验研究。分别从体系中SO42-的还原率、COD和体系pH值的变化以及硫酸盐还原菌(SRB)耗用的电子流等方面考查了硫酸盐生物还原的规律。结果表明,在实验考察的温度范围内,反应温度为38.0℃时SRB的延迟期最短,SO42-还原速率和有机物的降解速率最大,但SRB竞争有机物的能力最弱;体系初始pH值为7.50时,SRB对SO42-的还原和有机物的降解效果良好,但争夺碳源的能力弱于MPB,较低的初始pH值不利于SRB对SO42-的还原;当初始COD/SO42-值为1.30～5.13时,初始COD/SO42-越大,SRB的延迟期越短,SO42-还原速率和有机物的降解速率越快,但SRB争夺有机物的能力较差。

An experimental study of some main influential factors, such as reaction temperature, initial pH value and COD/SO42- value in biological sulfate reduction system was done by using an intermittent biological reactor. The experiment investigated the law of biological sulfate reduction from the changes of SO42- reduction rate, COD, pH value and electronic. Flow consumed for SRB in the system. It is indicated that, within the temperature investigated, When reaction temperature being 38℃,the lag phase of SRB is the shortest; the reduction rate of SO42- and degradation rate of organics are the maximum, but the ability of SRB competing organics is the weakest; when initial pH being 7.50, the effect of degradation of SRB on the reduction rate of SO42- and degradation rate of organics are better, but the ability to contend for carbon source is weaker than MPB; lower initial pH value is disadvantageous to the reduction of SO42- by SRB; when initial COD/SO42- value is 1.3 5.13, the greater the initial COD/SO42-, the shorter the lag phase, the quicker the reduction speed of SO42- and the degradation rate of organics, but the ability to contend for organics is poor.