Domestic sludge-based charcoal preparation method, and application of charcoal

Abstract

The invention relates to a domestic sludge-based charcoal preparation method, and an application of charcoal, and belongs to the technical field of environment restoration. The method comprises the following steps: air-drying domestic sludge, grinding to obtain a raw material with the particle size of 60 meshes, sealing the raw material in a crucible, placing the crucible in a muffle furnace, roasting at 300-500DEG C, cooling to room temperature, and taking out sludge charcoal from the crucible. A difficultly-soluble, stable and highly-aromatize solid substance rich in carbon is obtained through the method, and test confirms that the substance can be used to adsorb heavy metal pollutants in environment as an environment restoration material, and can efficiently remove heavy metal (such as Pb and Cd) pollutants in water and soil.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to a method for preparing and using an environmental restoration material for removing heavy metal pollutants in water bodies and soil environments while effectively recycling sludge. Background technique [0002] With the construction and operation of my country's urban sewage treatment plants, more and more excess sludge is produced by China's urban sewage treatment plants, but there is no good method for the treatment and utilization of sludge. Many sewage treatment plants incinerate sludge, which not only produces harmful substances such as dioxins, but also wastes sludge as a resource. If it is used to prepare biochar, it can not only effectively recycle these organic wastes, but also produce certain economic benefits. [0003] As a substance formed by pyrolysis of organic matter, biochar is rich in micropores. If it is applied to the treatment of...

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Problems solved by technology

However, these methods all have relatively large disadvantages. Engineering measures are relatively classic soil heavy metal pollution control measures. It has the advantages of thoroughness and stability, but the implementation of large quantities of engineering and high investment costs will destroy the soil structure and cause soil fertility. down, and the replaced soil should be stacked or treated; physical and chemical restoration belongs to in-situ restoration, does not disturb the soil layer, and can shorten the restoration time, but consumes a lot of power; the difficulty of biological restoration is to find a certain Or heavy metal-resistant plants and microorganisms that have adsorption effects on a certain group or series of metals, the cost of research is relatively high, and accurate conclusions cannot be drawn in the short term