纳米MgO对废水COD去除效果的研究

摘要

以模拟废水为研究对象,评价纳米MgO对COD的去除效果.研究了常温下光源类型(避光、自然光、紫外光)、MgO投加量及光照时间等因素对废水COD去除效果的影响.结果表明:在模拟废水COD为140 mg/L条件下,紫外光的作用明显优于避光和自然光条件；随着纳米MgO投加量的增加,COD去除率升高,在紫外光照射3.5 h,纳米MgO投加量为20g/L时,COD去除率可达73%.在此最佳工艺条件下,养殖废水的COD去除率可达68.15%,达到农业灌溉标准.%Simulated wastewater has been applied to the evaluation of COD removal efficiency by using nano-MgO. The effects of different types of light sources (light-tight,sunlight,ultraviolet) at normal temperature,nano-MgO dosage and light application time on the wastewater COD removal efficiency are studied. The results show that when the COD of simulated wastewater is 140 mg/L,the COD removal rate under UV light is better than that under light-tight or sunlight conditions. The COD removal rate increases with the increase of nano-MgO dosage. When the UV application time is 3.5 h,on 20 g/L nano-MgO,the COD removal rate can reach 73%. Under the optimum conditions , the COD removal rate of livestock wastewater reaches 68.15%. It reaches the mark of irrigation water quality.