微臭氧曝气复合无机盐抑制西湖底泥释磷的效果及机理研究

The Inhibition Effects and Mechanism of Micro Ozone Aeration Compound with Inorganic Salt on Phosphorus Release in the Sediments from West Lake

底泥中磷的释放是水体富营养化的主要原因,因此研发经济高效的抑制底泥磷释放技术至关重要.在强度为0.6g/min的微臭氧曝气创造的氧化环境中,对西湖底泥投加不同浓度梯度的钙盐和铁盐,结果显示:0.02mol/L的氯化钙和0.05mol/L的氯化铁对底泥释磷的抑制率分别达到了32%和33%;从磷分级角度来观察,与对照组相比,底泥中可溶性磷含量分别降低了50%和70%,同时钙盐和铁盐处理组中的铝磷浓度均下降了60%.该研究将物理与化学技术有机结合,其微臭氧曝气复合无机盐技术能有效缓解城市水体底泥内源磷素释放,改善水体水质,具有重要意义.

The main cause of water eutrophication is phosphorus release in sediments, so that it is critical to develop an economical and effective technology for inhibiting phosphorus release in sediments. Different concentration gradients of calcium salt and ferric salt were added to the West Lake sediments in an oxidation environment, which was created by micro ozone aeration（0.6 g/min）. The results show that the inhibition ratios of CaC12 （0.02 mol/L） and FeC13 （0.05 tool/L） are 32% and 33% respectively. From the perspective of phosphorus grading and comparing with the control group, the contents of dissoluble phosphorus in sediments reduce by 50% and 70%. Meanwhile, the concentrations of aluminum phosphorus in calcium salt and ferric salt treatment group both decline about 60%. This study combined physical and chemical technologies well, and the technology of micro ozone aeration compound with inorganic salt is meaningful, which can effectively relieve the phosphorus release in the sediments of urban water and improve the water quality.