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底泥疏浚是治理太湖污染的必要途径之一。限于目前国内的经济与技术条件以及疏浚底泥的数量巨大,太湖雪浪底泥堆场只能直接采用下部的天然黏性土层作为防渗层而不加任何处理。为了确保疏浚污染底泥在堆放期间不对周围环境和地下水造成污染,采用渗透与阻隔、静态吸附、动态土柱等试验测定和分析了黏土层对底泥中主要污染物(总氮、氨氮、硝氮、亚硝氮、总磷、化学耗氧量(COD))渗透和运移的阻隔能力,同时得到了可用于分析污染物在土层中运移和转化规律的一些重要参数。试验结果表明,雪浪堆场下部的黏土层对疏浚底泥中的主要污染物具有较强的吸附和阻隔能力。
Sediment dredging is one of the necessary ways to control pollution in Taihu Lake. Due to the current domestic economic and technological conditions and the huge amount of dredged sediment, the natural clay layer in the lower part of the lake can only be used as an impermeable layer without any treatment. In order to ensure that the dredged sediment does not pollute the surrounding environment and groundwater during the deposition period, the effects of clay layer on the main pollutants (total nitrogen, ammonia nitrogen, nitrate Nitrogen, Nitrite, Total Phosphorus and Chemical Oxygen Demand (COD), and some important parameters that can be used to analyze the transport and transformation of pollutants in the soil layer were obtained. The test results show that the clay layer in the lower part of Xuelang Yard has strong adsorption and barrier ability to the main pollutants in the dredged sediment.