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 and a 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 harmless treatment of sludge produced by river dredging. Background technique [0002] Sediment is an important part of the fluvial ecosystem, mainly composed of inorganic minerals, organic matter and mobile phase. The chemical composition of the sediment and the biota together constitute the ecology of the sediment, 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 algae phase of the overlying water; the microbial activity of the sediment It determines the decomposition speed of the organic pollution of the river, and then determines the purification ability of the river water. The endogenous pollution caused by sedimentation is an important form of pollution in rivers, and it is also one of the important reasons for the black and s...

AI Technical Summary

Problems solved by technology

As the concentration of pollutants in river silt is getting higher and higher, some pollutants such as heavy metals are extremely toxic, and traditional treatment methods will cause serious secondary pollution of the soil and groundwater in the dumping place; silt often produces foul smell and emits odorous gas , resulting in air pollution around the storage area, mosquitoes and flies, and harm to the surrounding environment and human health; with the development of cities and the rise in land prices, it has become uneconomical to directly bury sludge in land receiving sites

Moreover, with the advancement of urban river regulation, the traditional natural drying method is no longer suitable for the dredging of urban rivers.

However, the concentrations of organic matter and heavy metals in river sediments in Guangzhou City are seriously exceeding the standard. If they are not dealt with in time, they will often produce foul odors and emit odorous gases, resulting in air pollution around the dumping area. Harm to the environment and human health

[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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