River surge silt harmless and recycling treatment method

Abstract

The invention provides a river surge silt d harmless and recycling treatment method. In the method, a dredger is utilized to suck silt, the silt is sent into a biochemical treatment pond from the ship through a silt transmission pipeline, compound enzyme is utilized to carry out bioremediation, gravels and sands with the particle size bigger than 1mm are filtered out by a primary hydrocyclone anda vibration screen, sands with the particle size of 0.075-1mm are filtered out by a secondary hydrocyclone and the vibration screen, powdery particles with the particle size of 0.025-0.075mm are filtered out by a third-level hydrocyclone and the vibration screen, powder particles are further separated out from outlet silt tail water through a sediment tower, sewage from the sediment tower is filtered by utilizing a fiber filter after flocculant is added into the sewage, and powdery particles are deposited from backflushing silt after being filtered by utilizing the sediment tower again, and the powdery particles are dehydrated by the third-level hydrocyclone and the vibration screen after entering a sludge pool and are cured by a curing agent after dehydration. The method has high resource utilization ratio, meets the requirements for the environmental protection, particularly carries out stage treatment on the silt, lowers the cost and enhances the efficiency.

Description

technical field [0001] The invention relates to a sludge treatment method, in particular to a process method for the harmless treatment of sludge produced by river dredging. Background technique [0002] Sediment is an important part of river ecosystem, mainly composed of inorganic minerals, organic matter and mobile phase. The chemical composition of the sediment and the biota together form the sediment ecology, which determines the water quality of the overlying water; the buffer capacity of the sediment determines the stability of the water quality; it also determines the stability of the algal phase of the overlying water; the microbial activity of the sediment It determines the decomposition rate of organic pollution in the river, and then determines the purification capacity of the river water. Endogenous pollution caused by sediment deposition is an important form of river pollution, and it is also one of the important reasons for the black odor of river water. [0...

AI Technical Summary

Problems solved by technology

[0005] At present, the final disposal methods of river dredging silt and sediment at home and abroad mainly include comprehensive utilization, landfill, and throwing into the sea. The mud has a high content of organic matter and heavy metals, so it cannot be simply landfilled or thrown into the sea, nor can it be used as farmland and forest land, otherwise the secondary pollution will be very serious; while incineration and low-temperature pyrolysis have low efficiency and high cost. Moreover, the incineration of bottom sludge may also produce dioxins, causing secondary pollution; therefore, the best way to use dredged sludge is to make building materials, mainly used for construction sand, fill soil and cement

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