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微生物在采出水处理中的应用越来越广泛,但污水中的硫酸钙等在微生物表面的沉积会降低微生物的处理效果。为了研究硫酸钙垢在颗粒表面的沉积过程,利用光学显微镜、激光粒度仪测定了硫酸钙垢在粘土颗粒表面的生长形态以及粒径的大小与时间的关系;通过溶液析晶过程中电导率的变化,探索了垢在表面反应阶段的结晶动力学;同时对垢沉积过程中Zeta电位的变化规律进行研究。结果表明,硫酸钙在膨润土表面反应阶段为一级反应,反应速率常数为0.00675 min-1;10 min以后电导率不变进入晶粒长大期。晶体在粘土表面沉积过程中颗粒呈现大小循环变化趋势,总体在9~17μm之间变化。硫酸钙在膨润土表面沉积过程的Zeta电位由最大值的-34.6 m V逐渐恒定到-5~-7 m V。
Microbial applications in the production of water treatment is more and more widely used, but the sewage in the deposition of calcium sulfate and other microorganisms will reduce the microbial treatment effect. In order to study the deposition process of calcium sulfate scale on the surface of the particles, the relationship between the growth morphology of calcium sulfate scale on the surface of clay particles and the size of the particle size was determined by optical microscope and laser particle sizer. The crystallization kinetics of fouling at the surface reaction stage was explored. At the same time, the variation law of Zeta potential in fouling process was studied. The results showed that calcium sulfate was first-order reaction in the reaction stage of bentonite, and the reaction rate constant was 0.00675 min-1. After 10 min, the conductivity did not change into grain growth. During the deposition of the crystal on the clay surface, the size of the particles showed a cyclic change, which varied from 9 to 17 μm overall. The Zeta potential of calcium sulfate deposition on the bentonite surface is gradually constant from -34.6 mV to -5 ~ -7 mV.