Coupling method for treating wastewater containing heavy metal ions by algae and preparing biomass fuel from algae

Abstract

The invention relates to a coupling method for treating wastewater containing heavy metal ions by algae and preparing biomass fuel from the algae. The coupling method comprises: introducing the wastewater into an algae pond, and removing heavy metal by the algae through biological adsorption and biological absorption, wherein an algae cell wall contains a lot of polysaccharides and proteins and is combined with the heavy metal; after finishing wastewater treatment, collecting the used algae through a fishing and filtering method; carrying out airing treatment; putting the algae into a vacuum reactor and carrying out dry distillation; heating to 400 DEG C to 600 DEG C and naturally cooling to room temperature; cooling a gas product, generated by pyrolyzation, through a condensation device, and collecting to obtain a liquid product; discharging uncondensed gas through an exhausting pipe; after centrifuging and separating the liquid product, obtaining a water-phase product and biomass oil, wherein gas is a fuel gas product, liquid is fuel oil and residues in the reactor are carbonized algae residues and heavy metal grains conglobated at high temperature; collecting reactant residues and calcining to obtain metal powder. The total resource utilization efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of chemical product preparation, in particular to a coupling method for treating wastewater containing heavy metal ions with algae and preparing biomass fuel from algae. Background technique [0002] The use of algae to treat wastewater is a green wastewater treatment method that has emerged in recent years, especially electroplating wastewater containing heavy metal ions. Some algae can absorb heavy metal ions and reduce them to metal elemental particles. Finally, these tiny metal ions Elemental particles are adsorbed on the surface of algae or "swallowed" into algae cells. Through this process, the toxicity of wastewater containing heavy metal ions is greatly reduced. However, the algae used in this process have no economic value after the wastewater treatment is completed, and are usually directly incinerated or disposed of. [0003] Biomass fuel is a general term for the production of fuel oil or fuel g...

AI Technical Summary

Problems solved by technology

There are also researchers who try to use algae to produce biomass fuels, but the obtained fuels have problems such as low calorific value and excessive nitrogen emissions due to high oxygen and nitrogen content, making it difficult to compare with fossil fuels

How to prepare fuels with low oxygen and nitrogen content from biomass is an urgent technical problem that needs to be solved. In recent years, some researchers have tried to use metal powder as a catalyst and add it to the reaction of algae to prepare biomass fuel to reduce The oxygen and nitrogen content of its products, but the manufacturing cost of this kind of metal powder catalyst is expensive, which greatly increases the manufacturing cost of biofuels