Preparation method for Canna biological carbon capable of simultaneously adsorbing ammonia nitrogen and cadmium

Abstract

The invention discloses a preparation method for Canna biological carbon capable of simultaneously adsorbing ammonia nitrogen and cadmium. The method comprises the following steps: step 1, preparation of raw materials: a step of removing impurities of harvested Canna and then carrying out air-drying, and successively carrying out crushing and drying; step 2, oxygen isolation carbonization: a step of placing the crushed and dried Canna in a carbonization furnace, then carrying out oxygen isolation carbonization reaction by heating the crushed and dried Canna to 480 to 520 DEG C with a heating rate of 4 to 6 DEG C / min, and carrying out heat-preserving reaction for 1.8 to 2.2 hours; and step 3, subjecting the carbonized Canna obtained in the step 2 to cooling to room temperature, and carrying out crushing and sieving so as to obtain the Canna biological carbon. The preparation method for the Canna biological carbon provided by the invention solves the problems of capability of only aiming at single pollutant, low adsorption efficiency, easiness to cause secondary pollution, high cost and the like in the prior art of adsorption; meanwhile, the wastes of waterbody remediation plants are reasonably utilized; secondary pollution is prevented; moreover, carbon in plants is stably sealed; carbon dioxide emission is reduced; and significant ecological benefits are obtained.

Description

technical field [0001] The invention relates to the preparation of a biochar material, in particular to a biochar material and a preparation method for efficiently adsorbing ammonia nitrogen and cadmium in a water body, belonging to the field of water treatment. Background technique [0002] With the increase of population and the rapid development of industry and agriculture in today's society, the water body safety situation has become more and more severe, especially water eutrophication and heavy metal pollution have attracted widespread attention because of their prevalence and severity. Among the many methods of water pollution control, adsorption method is widely used because of its advantages of high efficiency, low cost, easy operation and small environmental disturbance. Biochar is a stable, highly aromatic and carbon-rich solid substance produced by high-temperature pyrolysis of biomass under anoxic conditions. Because of its well-developed pore structure and larg...

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Problems solved by technology

The invention overcomes the problems that the existing adsorption technology can only target a single pollutant, and the adsorption efficiency is not high, it is easy to cause secondary pollution and the cost is high; at the same time, the water restoration plant waste is rationally utilized to prevent secondary pollution, Moreover, the carbon in plants is stably sequestered, which reduces carbon dioxide emissions and has significant ecological benefits.

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