Dredged bottom mud solidification modification method

Abstract

The invention relates to the technical field of bottom mud dredging, and discloses a dredged bottom mud solidification modification method, which comprises the following steps: sludge enters a grit chamber after garbage sorting, sand and stone separation is carried out in the grit chamber, and substances with low ash content and high carbon content are added into the grit chamber, so that the adsorption performance of a sludge derived adsorbent is improved, and heavy metal ions are adsorbed. Separated sand stone is settled and then is dug at regular intervals, then interstitial water in the sludge is separated out through a gravity concentration method under the natural gravity settling effect, and the water content of the sludge is reduced. Through concentrating, the solid content of sludge is improved, subsequent treatment is facilitated, the sludge conveyed from a concentration tank is received by a sludge conditioning device, a curing agent is added, the dehydration performance is improved, the activity of pollutants is reduced, and the leaching rate of heavy metals is reduced, so that the purpose of sludge modification is achieved. Then, the conditioned sludge is pumped into a squeezer through a squeezing feed pump, the sludge is dehydrated into a sludge cake with the water content of less than 50%, and the dehydrated sludge cake is transported out for resource utilization.

Description

Technical field [0001] The present invention relates to the field of sewing techniques, and more particularly to dredging undercut curing modification methods. Background technique [0002] With the rapid development of technology and the acceleration of industrialization, a large amount of wastewater, exhaust gas, waste residue, etc., disorderly discharged into the river and gradually adsorbed over time, and finally enriches In the bottom of the river, severe sub-mud contamination. When the water environment changes, the contaminants adsorbed in the bottom mud can not only resend the secondary pollution, but also directly produce toxic effects directly to the bottom mud organism, and is further pairing through the enrichment and magnification of the food chain. Animal and even human health have caused a serious threat. In numerous pollutants, the weight of the heavy metal pollution in the sewing cannot be ignored. Heavy metals have persistence in the river mud, cannot be degrade...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a solidification and modification method for dredging bottom mud, aiming at the harm caused by heavy metal leaching toxicity, high water content and high fluidity of bottom mud to its resource utilization, screening, research and development of dehydration solidification agent and stabilizing agent, optimization process parameters, to achieve low dosage, low volume increase ratio, and low economic cost of sediment dehydration and solidification, and the sediment stabilized / solidified by heavy metals can be recycled for engineering backfill, thus realizing "zero sludge transportation, zero environment" burden", reduce the risk of environmental pollution, reduce the cost of engineering construction, have important environmental, social and economic benefits, and solve the problems in the background technology

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