湖水源热泵系统冷排水对湖泊水质的影响试验研究

Study on Effects of Cold Discharge of Lake Water Source Heat Pump Systems on Lake Water Quality

针对湖泊热环境容量小、生态系统脆弱的特点,以三峡库区重庆段湖泊水体为对象,采用物理模拟的方法对湖水源热泵系统冷排水受纳水域溶解氧、高锰酸盐指数、氮磷等进行了模拟试验研究。结果表明,由于冷排水引起了湖泊局部水域水温下降导致表层溶解氧升高,对底层溶解氧则影响微弱;冷排水显著降低了受纳水域的高锰酸盐指数并使水的碱度升高,但对pH值影响不明显;冷排水使湖泊氨氮升高,对硝氮影响很小但可限制总氮升高,有机氮含量减少并使总磷略有升高。冷排水受纳水体总氮和总磷无明显相关性。

Aeeording to small environmental capacity and fragile ecosystem of lake, lakes in Ch0ngqing Section of Three Gorges Reservoir area are taken for the research object, using the method of physical simulation, the effects of cold water discharge of lake water source heat pump systems on DO, CODMn, nitrogen and phosphorus are studied. The results show that cold discharge lead to the water temperature decrease in local area of lake, thus, the DO near outfall was increased,but the bottom DO was unchanged. Cold discharge mades CODMn decreasing significantly. It also mades the Al- kalinity increasing to some degree, but the effect is not significant on pH. Cold discharge leads to increase of ammonia nitrogen,but it has little effect on nitrate nitrogen. Cold discharge has certain limit function on total nitrogen increasing, which was mainly the content of organic nitrogen. The total phosphorus also increases because of cold discharge, but it was not significant. The correlation between total nitrogen and total phosphorus was not remarkable.