Preparation method and application of adsorbent for heavy metals lead and chromium

Abstract

The invention relates to a preparation method and the application of an adsorbent for heavy metals lead and chromium, which can effectively solve the problems of preparing a heavy metal adsorbent by using waste mushroom dregs, realizing waste utilization, saving resources, effectively removing heavy metals in wastewater and realizing environmental protection, and comprises the following steps: air-drying waste mushroom sticks after edible mushroom cultivation, and mixing with corn straws; the method comprises the following steps: crushing and sieving with a 80-mesh sieve to obtain mushroom dreg powder, putting the mushroom dreg powder into a carbonization furnace, heating to 500 DEG C at a heating rate of 10 DEG C / min under the protection of nitrogen, keeping the temperature for 2 hours, and cooling to room temperature to obtain mushroom dreg biochar, namely the adsorbent for the heavy metals lead and chromium; the mushroom dreg biochar is prepared from the following components in percentage by mass: 1.31 percent to 1.32 percent of N, 43.91 percent to 44.48 percent of C, 2.32 percent to 2.38 percent of H, 0.37 percent to 0.38 percent of S, 33.30 percent to 33.71 percent of C / N and18.21 percent to 18.90 percent of C / H. The invention has the advantages of abundant raw materials, simple preparation method, cheap and easily available raw materials, low cost, simple operation, realization of resource utilization of agricultural wastes, changing of wastes into valuables, and mitigation of environmental pollution.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a preparation method of an adsorbent for heavy metal lead and chromium in wastewater by using edible fungus slag biochar to adsorb heavy metal lead and chromium and its application. Background technique [0002] With the rapid development of industry and agriculture and the wanton discharge of industrial wastewater, the demand for water resources is increasing, and the demand for improving water quality is also imminent. The use of agricultural chemical fertilizers, pesticides, herbicides, etc. during agricultural production and the development of industrial activities such as mining, electroplating, metal plating, alloys, batteries, textiles, pigments, and other chemical industries have increased the amount of heavy metal ions released into the environment, It is the main cause of water pollution problems. The heavy metals in these water bodies can be enriched and accu...

AI Technical Summary

Problems solved by technology

[0003] Mushroom residue, as a kind of edible fungus cultivation base waste, produces at least 4 million tons per year in my country, and its utilization rate is only 33%, resulting in a huge waste of resources and environmental issues

The traditional method of disposing of fungus residues is to discard or burn them. Combustion can only quickly obtain about 10% of the heat energy, which is an unreasonable use of biomass; fungal residues are rich in protein and other nutrients, and random discarding is a waste of resources. At the same time, it also leads to the growth of mold and pests, increasing the number of harmful spores and pests in the air, which will inevitably cause environmental pollution

Due to the loose porous structure, unique surface characteristics and chemical properties of biochar made from fungal residue, it has good adsorption capacity for heavy metal pollutants, but the raw material and pyrolysis temperature of fungal residue biochar significantly affect the biocharization product. Physical and chemical properties such as yield, ash content, carbon, nitrogen, phosphorus content, acidic and basic functional groups, aromatization structure, porosity and specific surface area, etc., which in turn affect its repair effect on heavy metals