Method for carrying out anaerobic digestion by using heavy metal ions-rich biomass waste materials

Abstract

The invention provides a method for carrying out anaerobic digestion by using heavy metal ions-rich biomass waste materials. The method comprises the following steps: adding charcoal produced from garden wastes and agriculture and forestry wastes or plants used for adsorbing heavy metal ions to wastewater containing heavy metal ions to obtain heavy metals saturated charcoal or heavy metals hyper-enriched plants; and adding the heavy metals saturated charcoal or heavy metals hyper-enriched plants to a kitchen waste anaerobic digestion system for methane production according to a certain ratio. The heavy metal ions adsorbed by the plants or the charcoal are used as a basic composition part of anaerobic reaction enzyme to promote growth of methanogens, activate the activity of the enzyme, shorten the hydrolysis acidifying time, reduces the accumulation of VFA and accelerate the generation of methane and other energy products, so the heavy metals saturated charcoal or the heavy metal hyper-enriched plants are processed, secondary pollution to environment is eliminated, reduction and harmless utilization of the wastes are realized, anaerobic digestion production of methane is promoted, and the method is of great significance to accelerate the processing and recycling of the kitchen wastes.

Description

technical field [0001] The invention relates to the field of environmental protection technology and the field of new energy development and utilization, in particular to a method for anaerobic digestion of biomass waste materials enriched in heavy metal ions. Background technique [0002] In recent years, with the development of industry, heavy metal wastewater has increased. Domestic wastewater and industrial wastewater contain Cu, Zn, Co, Ni and other metals. If not treated, heavy metals will cause great harm to the natural environment and human health. At present, the common treatment methods of heavy metal wastewater include chemical precipitation method, oxidation-reduction method, ion exchange method, etc., but these methods inevitably lead to the problems of difficult recovery, small treatment volume and high cost. Therefore, it is very important to find low-cost and high-efficiency governance methods. Biochar adsorption method or plant adsorption method for adsorbi...

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Problems solved by technology

Therefore, biochar or plant adsorption of metals is nothing more than transferring metals from one place to another, and cannot fundamentally solve the problem of heavy metal pollution

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