臭氧对循环水系统中悬浮颗粒物净化效果及机理研究

为了研究臭氧对循环水养殖系统中悬浮颗粒物的净化效果,探讨臭氧对悬浮颗粒物的影响机理,在养殖水体投加不同量的臭氧进行实验室小规模模拟实验,对水体的TSS、浊度等指标进行检测,并对悬浮颗粒物进行粒度分析。结果表明投加臭氧有助于降低水体浊度,投加7.53mg/L臭氧可将浊度为(5.22±0.55)NTU的原水降低浊度12.47%,投加15.05mg/L和22.58mg/L 臭氧则可提高到25.31%和30.20%。投加臭氧将影响悬浮颗粒物的物理特性,在投加22.58mg/L臭氧时对颗粒物助凝效果显著,将悬浮颗粒物粒径大多分布在48-68um范围的原水转变成99.22%数量的颗粒物粒径>64um,有利于后续物理过滤处理。本研究明确了臭氧对悬浮颗粒物的净化效果是通过氧化有机物产生络合沉淀和胶体絮凝物等改变颗粒物的粒径大小分布的途径来实际的,为臭氧在循环水养殖系统中的应用提供理论支撑。

Ozone: Purification Effect and Mechanism on Suspended Particulates in Circulating Water System

To study the purification effect and the mechanism of ozone on suspended particulates in water, discuss its application and process integration in aquaculture water treatment, the authors built several smallscale test systems, added different amounts of ozone into aquaculture water, analyzed the effect on TSS and turbidity, and conducted the grading analysis of particle size of suspended particulates. The control group did not add ozone, and the ozone adding amount of the 3 test groups was 30.1, 60.2, 90.3 mg, respectively, the treated water volume were all 4 L. The results showed that: (1) adding ozone could remarkably reduce the turbidity of aquaculture water; the turbidity of the 3 test groups was reduced by 12.47%, 25.31% and 30.20% respectively when the turbidity of initial water was (5.22 ± 0.55) NTU; (2) adding ozone was helpful for coagulation of suspended particulates in water body; the particle size of the suspension particulates in control group was mostly distributed in 48-68 μm; however, the rate of the suspended particulates whose particle size was above the 64 μm was 99.22% in test group water with the ozone adding amount of 90.3 mg, which contributed to subsequent physical filtration. The study suggests that the effect of ozone purification on suspended particulates is achieved by changing particle size distribution by the way of oxidizing organic compounds to produce complex precipitates and colloidal flocs, which provides theoretical support for the application of ozone in circulating water system.