反硝化脱硫工艺中生物硫分布特征及分离方法

Distribution characteristics and separation of biological sulfur in denitrifying sulfide removal process

摘要:

为探寻反硝化脱硫工艺生物硫分离方法,运行反硝化脱硫系统获得生物硫在系统中分布特征,并对生物硫进行粒径分布、Zeta电位、能谱及电镜扫描分析,确定了一种分离生物硫的新方法．结果表明,生物硫在反硝化脱硫系统中水相占65％,污泥相占35％．能谱分析表明,生物硫硫元素占60％以上,电镜分析显示生物硫表面具有多聚糖、蛋白质等官能团,生物硫Zeta电位平均为-20 mV带负电(在± 30 mV之间),得出生物硫具有胶体特性．进一步用阳离子絮凝剂实验分离生物硫获得99％分离率．混凝沉淀方法能有效地分离回收生物硫．

Abstract:

To better separate biological sulfur from denitrifying sulfide removal (DSR) process, we determined a new method by researching on the distribution characteristics of biological sulfur in this process system, Zeta potential, particle size distribution, scanning electron microscope and energy spectrum analysis. The results showed that the biological sulfur in the effluent and sludge accounted for 65％ and 35％ of the total sulfur production, respectively. S content of biological sulfur particles is no less than 60％. Zeta potential value is approximately -20 mV (between ±30 mV); Biological sulfur particles are spherical with rough surfaces, with many functional groups on the surface such as polysaccharide and proteins. The above biological properties indicate that it has characteristics of colloid. The biological sulfur flocculation rate is approximately 99％ when using cationic coagulant to separate biological sulfur. Coagulation is an effective method of separating biological sulfur form (DSR) process.