生物固定化是一种新型防控水源地水体重金属污染技术.实验采用固定化硫酸盐还原菌(SRB)处理含铊废水,并研究了SRB处理含铊废水的机理,研究结果表明,包埋后SRB仍能够保持较强活性,pH和接触时间对固定化SRB处理含铊废水具有较大影响,包埋小球pH耐受性较好,最适pH值是6,处理在720min达到饱和量.菌液包埋量和废水中硫酸根离子浓度对固定化处理含铊废水作用重要,处理量高达253.94 μg·g-1.采用EDS和XRD分析了反应体系中沉淀物的组成,表明溶液和小球沉淀物中均含有硫化铊,硫化铊沉淀是固定化SRB处理含铊废水过程中铊污染去除的重要机制,固定化SRB可有效防控水源地铊污染.
Biological immobilization is a new method for the prevention and control of heavy metal pollution in the water source areas.In this study,ilumobilized sulfate reducing bacteria (SRB) was used to treat wastewater containing thallium,and the main mechanism of thallium removal was studied.The results indicate that the SRB retained its activity after immobilization,and pH and contact time had great impact on thallium removal.The beads had great tolerance to pH change,and the optimum value is 6.Saturated amount was reached at 720 min.The amount of bacteria entrapped and concentration of sulfate in wastewater played key roles in the process of treating thallium by immobilized SRB,and the max treatment amount of thallium was up to 253.94 μg · g-1.The composition of precipitation in the immobilized SRB system was analyzed by energy dispersive spectrometer (EDS) and X-ray diffraction (XRD).It was revealed that thallium sulfide existed in the precipitation of the solution and beads.Precipitation of thallium sulfide was the important mechanism for thallium removal during the course of treating wastewater containing thallium by the beads of immobilized SRB.Immobilized SRB can effectively prevent and control thallium pollution in water source areas.
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