Characterization method for biogas residue aerobic composting fermentation maturity

Abstract

The invention provides a characterization method for biogas residue aerobic composting fermentation maturity. The method includes: subjecting a to-be-detected sample of biogas residue aerobic composting to detection by microscopic infrared transmission spectrum, extracting single wavenumber second derivative spectral images with a wavenumber of 2850+ / -30cm<-1> and a wavenumber of 1568+ / -30cm<-1> and radial second derivative spectral data thereof; according to the variation trend of the second derivative spectral data under a wavenumber of 2850+ / -30cm<-1> and a wavenumber of 1568+ / -30cm<-1> from the outside to the inside along the radial direction, acquiring an intersection point, i.e. the aerobic layer thickness; and then characterizing the biogas residue aerobic composting fermentation degree according to the aerobic layer thickness change. The method provided by the invention selects specific wavenumber for detection of the biogas residue aerobic composting aerobic layer thickness, so that the detection method for characterization of maturity is accurate, also the detection method has the characteristics of rapidity, convenience and small environmental pollution, thus having very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of organic solid waste disposal and resource utilization, and in particular relates to a method for characterizing the maturity of biogas residue aerobic composting fermentation. Background technique [0002] In my country, livestock and poultry manure is a kind of solid waste, and the manure produced by large-scale breeding accounts for about 40% of its annual output. If a large amount of feces is discharged into the environment without treatment, it will cause environmental problems such as stench. In addition, livestock and poultry manure is also a kind of resource. If it is not used rationally, it will not only cause secondary pollution of the environment, but also lead to a large waste of organic matter resources. In addition to livestock and poultry manure, biogas residue produced after anaerobic fermentation is also a kind of solid waste. With the development of biogas projects in China, a large amo...

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Problems solved by technology

[0004] At present, aerobic composting maturity characterization methods include physical, chemical, biological and other indicators, but most of these determinations rely on traditional laboratory analysis methods, which are time-consuming and labor-intensive and easily cause environmental pollution; The dynamic change of infiltration depth from the surface to the inside of the surface can characterize the fermentation process of aerobic composting. This method is convenient, fast, and has little environmental pollution. Studies have shown that spectral imaging has good feasibility

However, after anaerobic fermentation of biogas residue, the particle structure of the material is relatively loose. During the aerobic composting fermentation process again, the dynamic change of oxygen penetration depth from the surface to the inside of the particle surface is different from that of the original livestock and poultry manure raw material. Therefore, at the particle level, the method used to detect the maturity of raw livestock and poultry manure cannot be applied to the detection method of the maturity of biogas residue aerobic composting

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