A method for improving the activity and methane-producing efficiency of anaerobic digestion methanogens by utilizing nano-ferric tetroxide

Abstract

The invention relates to a method for utilizing nano ferroferric oxide for improving the activity of anaerobic digestion methanogens and methanogenesis efficiency. The method aims at solving the problems that in the prior art, the addition concentration of Fe2+ / Fe3+ is hard to control, negative ion inhibition is caused, bioavailability is low, the chemical property is unstable, and cost is high. The method comprises the steps that short chain fatty acid salt is adopted as an electron donor, amine salt is adopted as a nitrogen source, phosphate is adopted as a phosphorus source, system basicity is maintained, and under the culture condition of continuous flow anaerobic fermentation, anaerobic mixed granule sludge is separated, and mixed seed sludge is obtained; the short chain fatty acid salt is adopted as the electron donor, the amine salt is adopted as the nitrogen source, the phosphate is adopted as the phosphorus source, the system basicity is maintained, the nano ferroferric oxide is adopted as an iron ion donor, the mixed seed sludge is adopted as inoculation sludge, and culturing is carried out under the static anaerobic fermentation condition. The method is used for improving the activity of the anaerobic digestion methanogens and the methanogenesis efficiency.

Description

technical field [0001] The invention belongs to the field of biomass energy. Background technique [0002] Rational use of energy and environmental pollution control are two key issues that affect my country's sustainable development. Developing biomass energy represented by biogas and changing the energy structure dominated by fossil energy is an effective way to solve energy problems; developing low-energy, high-efficiency environmental pollution control technologies and realizing efficient recycling of resources is an environmental protection field. one of the focus of work. As a comprehensive system that combines environmental governance, energy recovery and ecological virtuous cycle, anaerobic digestion is widely used in wastewater treatment, sludge treatment, urban domestic waste treatment, rural crop straw and livestock manure anaerobic fermentation and other aspects. It can produce a large amount of CH while achieving low energy consumption and efficient degradatio...

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problem of Fe in the prior art 2+ / Fe 3+ In order to solve the problems of difficult control of dosing concentration, anion inhibition, low bioavailability, unstable chemical properties and high cost, it provides a method to improve the activity and methane production efficiency of anaerobic digestion methanogens by using nano ferric iron tetroxide