An integrated process of ecological dredging and sludge solidification and disposal

Abstract

The invention discloses an integral process for ecologically desilting and curing sludge. The process comprises the following treatment steps of: I, absorbing riverbed sludge in an undistributed way; II, pretreating landed slurry based on high-frequency oscillation; III, decreasing and concentrating slurry-containing sewage while adding a flocculating agent A; IV, performing solid-liquid separation on the concentrated slurry, conveying the concentrated slurry in a decreasing and concentrating pond to a horizontal centrifuge, adding a flocculating agent B and centrifuging to obtain dehydrated slurry cakes; V, inputting the dehydrated slurry cakes into curing equipment, adding a curing agent to obtain cured sludge, introducing sewage drained from the centrifuge into an adjusting pond, adding a flocculating agent C, homogenizing, blending, elevating to a purifying tower through an elevating pump, and adding a flocculating agent D; and VI, making a purified liquid part drained from the purifying tower reflow for utilizing, and making precipitated concentrated slurry reflow to the decreasing and concentrating pond for retreating. The integral process has the advantages of high desilting efficiency, low cost, no secondary pollution, small floor area, and detachability and assembly for rapid transition.

Description

technical field [0001] The invention relates to the fields of water conservancy and environmental protection, in particular to the fields of ecological dredging of river and lake bottom mud, dehydration and solidification of mud and purification of muddy sewage. Background technique [0002] According to statistics from relevant departments, my country loses an average of more than 5 billion tons of soil every year, and most of the surface soil layer of about 1 cm will slowly flow into rivers and lakes, and the land area affected by river sedimentation is as high as 1 million mu. Due to the shrinkage of the reservoir due to sedimentation, the water reserve loss of the national reservoir reached 20 billion cubic meters, and the shipping mileage was reduced from the original 140,000 kilometers to the current 110,000 kilometers. As far as the specific situation of rivers and lakes is concerned, the serious sedimentation of rivers and lakes in my country is not limited to Dongti...

AI Technical Summary

Problems solved by technology

[0009] The problem in this comparative literature is that the mud obtained after vibrating screen pretreatment directly enters the belt filter press, and the amount of silt and sewage contained in the mud is very large, resulting in processing on the belt filter press. When the same filter belt is compressed, the pressure generated not only compresses the sludge, makes the water in it seep out, but also filters a large amount of sewage, which disperses the effective compression pressure of the filter belt and makes it discharge from the outlet of the filter press. The water content of the mud cake is still relatively large and cannot be used directly

At the same time, half of the treatment steps and related equipment (i.e., purification towers and centrifuges) in the comparative literature are for the purification of sewage obtained after vibrating screen treatment. It can be seen from this that the invention of the comparative literature focuses on dehydration of sludge Finally, the remaining sewage is purified, and only two links of vibrating screen and filter press are used for sludge dehydration, and the treatment effect is not enough to solidify, harden and reuse the sludge

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