Technique for treating remaining water of desilted sediment in Lake Tai

Abstract

The invention discloses a technique for treating remaining water of desilted sediment in Lake Tai, which comprises steps as follows: mud, which is desilted from Lake Tai, is discharged into a mud discharge yard through a mud discharge inlet of the mud discharge yard; the mud flows in the mud discharge yard and settles in a sediment heaping yard of the mud discharge yard; the remaining water of the mud flows to a water recession port of the mud discharge yard; a compound flocculant is added to remaining water at the water recession port; and the remaining water is discharged into a remaining water settling tank to carry out settling treatment. By organically combining a physical treatment method and a chemical treatment method, the technique disclosed by the invention can effectively remove COD (chemical oxygen demand), NH4<+>-N, TP (total phosphorus), SS (suspended sediment) and the like in water; and the reasonable site selection and design of the mud discharge yard are beneficial to the natural settling of the SS in water so as to reduce the consumption of the flocculant, the compound flocculant can thoroughly purify the remaining water, and the mutual cooperation exerts the optimal advantages of every treatment method, thereby achieving the goal of high-efficiency treatment of remaining water.

Description

technical field [0001] The invention belongs to the field of environmental protection, and in particular relates to a new process suitable for treating residual water of Taihu dredged sediment. Background technique [0002] Taihu Lake is the third largest freshwater lake in my country. However, since the 1980s, due to the rapid economic development of the river basin and the relatively lagging water environment protection work, the water quality pollution and lake eutrophication of Taihu Lake have become increasingly prominent, and the overall water quality has dropped to Class IV. , a series of problems such as water quality deterioration, blue-green algae outbreaks, and ecological environment degradation directly threaten the safety of water supply and ecological security along the lake and the river basin. In order to speed up the treatment of the water environment of Taihu Lake, the State Council approved the "Overall Plan for Comprehensive Treatment of the Water Environm...

AI Technical Summary

Problems solved by technology

Such a large-scale lake dredging project is the first time at home and abroad. Large-scale Taihu Lake dredging produces a large amount of silt, and the water content of Taihu Lake silt is relatively high, and a large amount of residual water will be discharged from the silt dump. The phase boundary is large. During the stacking process, the pollutants in the sediment will be released into the residual water. If the residual water is discharged to the receiving water body without treatment, it will cause secondary pollution.

At present, the technical problems of large-scale lake dredging engineering are relatively complicated. Most researchers only care about construction technology, dredging efficiency, land occupation for mud discharge, spoil treatment and ecological restoration, etc. There are not many studies on residual water treatment, and the accumulated experience less

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