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为了探索原位解决湖泛引起的水体感官和水质恶化问题,本研究在室内考察了改性当地土壤对湖泛黑物质的絮凝去除效果及土壤和沙子覆盖对絮体再悬浮的抑制作用,并在梅梁湾围隔实验中考察了改性当地土壤湖泊综合修复技术对模拟湖泛水体嗅味物质和营养盐的去除及水体溶解氧(DO)的改善效果.室内研究结果表明,壳聚糖改性土壤对湖泛水体黑物质的絮凝去除效果比聚合氯化铝更佳,在55 mg/L的壳聚糖改性土壤投加量时,水体浊度从对照的>2000NTU降低到5 NTU,土壤和沙子覆盖能够有效地减少湖泛水体黑物质絮凝去除后的再悬浮.现场研究结果表明,该技术处理30 min后总氮和总磷的去除率达到97.0%,嗅味物质DMTS和MIB的去除率达到75.0%以上,水体表层DO增加了75.0%,底层DO增加了183.5%.改性当地土壤湖泊综合修复技术对湖泛水体的感官和水质起到明显的应急改善效果.
In order to explore the problem of water body sensory and water quality deterioration induced by lake flooding in situ, this study investigated the flocculation removal effect of modified native soils on lake flooding black matter and the inhibitory effect of soil and sand cover on the floc resuspension In meizhan bay enclosure experiment, we investigated the removal of odor substances and nutrients and the improvement of dissolved oxygen (DO) in simulated lake water body by the integrated local soil and lake comprehensive restoration technology.The laboratory study showed that chitosan The flocculation effect of modified soil on lake water body black matter was better than that of polyaluminum chloride. When the dosage of 55 mg / L chitosan modified soil was added, the turbidity of water body decreased from> 2000NTU to 5 NTU , Soils and sand cover can effectively reduce the resuspension of black matter in lake water body after flocculation removal.The field research results show that the removal rate of total nitrogen and total phosphorus reaches 97.0% after 30 min treatment, the DMTS and MIB The removal rate of water reached above 75.0%, the DO of water surface increased by 75.0% and the DO of bottom layer increased by 183.5%. The comprehensive restoration technology of local modified soil and lake played a significant emergency and improved effect on the sensory and water quality of lake flood bodies.