Study On Sludge Removal And Disposal Methods Of Small And Medium Sized Reservoirs

Reservoirs, lakes are numerous in China, but reservoirs deposition problem are more and more serious in recent years, especially the small and medium-sized reservoir is more serious.Reservoir deposition not only reduces the capacity, the more serious problem is the lake silt perennial accumulation of pollutants. It is the lake water quality deterioration endogenous pollution sources.Mud contains organic pollutants, heavy metals, nitrogen and phosphorus nutrient andit isthe main reason of black smelly and eutrophication. Therefore, small and medium-sized reservoir environmental protection dredging is urgently needed. By studying the desludging of the reservoir includes sample collection and analysis to determine the amount of desludging, silt removal methods and sludge treatment and disposal methods to achieve the whole process of pollution control target, economic target and environment control target.This article mainly obtains the following conclusions:(1)Through the field investigation oftheiridescent cloud lakefound that t choose a research area of the corresponding points method, considering the actual sampling accuracy and feasibility of under the premise that guarantee representative ways both economic and reasonable.(2) Respectively, using the nutrition state index method and method of the iridescent cloud lake water eutrophication in reservoir evaluation, the results were showed the iridescent cloud lakereservoir water quality appear heavy eutrophication condition.(3)Each sampling point's mud of the iridescent cloud lake Ni, Cr, Cu, Pb sources of heavy metals mainly artificial sources, and the sources of Zn and Cd pollution of heavy metals mainly controlled by the nature.The potential ecological risk index of heavy metals and heavy metal potential ecological harm index RI evaluation result, the iridescent cloud lakeof heavy metals is light damage.(4) The iridescent cloud lakesilt of total nitrogen, total phosphorus and organic matter content and the upper water of total nitrogen, total phosphorus and potassium permanganate index are into positive correlation, therefore, nitrogen and phosphorus in the sludge and organic pollutants will continue to spread to the upper cover water, caused the lake water quality deterioration.(5)The removal of the silt layerat the bottom is ensure that the pollutants "can be cleared, and to keep the ecosystem of the lake bottom is not affected, and must give attention to both economic rationality and realize environmental protection dredging.According to the sample point dredging silt is divided three area, total 60000 m3 after dredging volume.(6)Dry dredging and water-in dredging each have advantages and disadvantages, according to the actual situation of the iridescent cloud lake, through the comparison of the desilting scheme, the iridescent cloud lake dredging engineering using belt water of desilting environmental cutter-suction dredger scheme for environmental protection dredging, this scheme can effectively remove the bottom silt,at the same time, canachieve for waterprotection.(7)Silt is reasonable and effective disposal is an important content of environmental protection dredging mud clouds lake environmental protection dredging project after the sludge pretreatment system, homogeneous system, centrifugal dehydration system outbound cement plant after burned, final disposal, ensure the silt resource utilization.Residual water after dealing,with the super magnetic separation, water purification technology standards, to prevent damage to the surrounding environment.In this paper, the whole dredging process research for the work of the other similar reservoir has a certain reference value and significance.