不同光强下LED光源改善避光封闭水体水质的应用

Application of LED Light Source Under Different Light Intensities to Improve the Water Quality of Light Shielded Closed Water

当前我国经济高速发展带来的问题是工业污水、生活废水等大量排放,造成水质恶化,含磷含氮等富含营养元素的污水排入封闭水体的现象最为严重。利用5000Lux、7500Lux、10000Lux三档不同光强的白色LED灯来补光避光两个月的封闭水体,探究水体净化效果,在一个月的补光实验里ORP、DO、Chl-a含量随时间推移均有所增加,且光照强度越大,其上升趋势越明显。而TP、EC呈现出逐渐下降的趋势,下降幅度随光强的增大而增大。三组实验组的pH和NH4+-N含量变化趋势大致相同,pH出现小幅上升,NH4+-N呈现出先上升后下降的趋势,补光能显著降低水体NH4+-N含量。以上结果表明较大光强对封闭水体的水质有更好的净化效果,可为相关水体的防治提供有益借鉴。

At present,the problem brought about by China’s rapid economic development is that a large number of industrial sewage and domestic wastewater are discharged, resulting in the deterioration of water quality. The phenomenon of phosphorus, nitrogen and other nutrient rich sewage discharged into closed water bodies is the most serious. Three white LED lamps with different light intensities of 5000Lux, 7500Lux and1000Llux are used to supplement light and avoid light for two months to explore the water purification effect.In the one month light supplement experiment, the contents of ORP, DO and Chl-a increase with time, and the greater the light intensity, the more obvious the upward trend. TP and EC showed a gradual downward trend, and the downward range increased with the increase of light intensity. The change trends of pH and NH4+-N content in the three experimental groups are roughly the same. The pH increases slightly, and NH4+-N increases first and then decreases. Light supplement can significantly reduce the NH4+-N content in water.The above results show that higher light intensity has a better purification effect on the water quality of closed water bodies, which can provide a useful reference for the prevention and control of related water bodies.