Abstract:
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 lighttight 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.
Key words:
nanocrystalline magnesia,
COD removal rate,
ultraviolet light,
livestock wastewater
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20 g/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。
关键词:
纳米氧化镁,
COD去除率,
紫外光,
养殖废水
CLC Number:
Lin Lingling, Wang Feng, Zhang Keqiang, Li Junxing, Du Lianzhu. Preliminary experimental study on removal efficiency of COD by nanocrystalline magnesia[J]. INDUSTRIAL WATER TREATMENT, 2011, 31(6): 28-31.
林玲玲, 王风, 张克强, 李军幸, 杜连柱. 纳米MgO对废水COD去除效果的研究[J]. 工业水处理, 2011, 31(6): 28-31.