A kind of composting system containing biochar and composting method thereof

Abstract

The invention discloses a biomass-charcoal-containing composting system and composting method. The biomass-charcoal-containing composting system mainly comprises the following raw materials in parts by weight: 92-110 parts of basic composting material, 0.3-0.5 part of microbial inoculant and 0.9-1.8 parts of biomass charcoal. The basic composting material comprises sludge and straws, wherein the sludge and straws are mixed, so that the carbon-nitrogen ratio of the basic composting material is 20-30, and the water content of the basic composting material is 50-70%. The method comprises the following steps: mixing the raw materials for constituting the basic composting material, adding the microbial inoculant and biomass charcoal into the basic composting material, and uniformly mixing to obtain the composting system. A three-step fermentation process is utilized to perform composting fermentation on the composting system for 28-32 days, thereby obtaining the biological compost.

Description

technical field [0001] The invention relates to the technical field of biological composting, more specifically, the invention relates to a composting system containing biochar and a composting method thereof. Background technique [0002] With the improvement of the urban sewage treatment rate in our country, a large amount of sludge is produced. If it is not treated effectively, it will easily cause secondary pollution to groundwater and soil. Compared with livestock and poultry manure, sludge has 2 to 3 times higher organic matter and higher nitrogen, phosphorus and potassium content. It is an excellent raw material for making organic fertilizers. Composting sludge will not only solve the pollution problem and turn waste into treasure, but also concentrate the volume of sludge in a large amount, reducing the pressure on sludge discharge sites and landfills caused by a large amount of sludge stacking. However, because sludge contains a large number of pathogenic microorga...

AI Technical Summary

Problems solved by technology

[0004] However, the proportion of biochar added is not as high as possible. On the one hand, a large amount of biochar added will greatly increase the composting cost; The content of nitrate nitrogen and ammonium nitrogen, as well as the passivation of heavy metals have direct or indirect effects. Therefore, an accurate and reasonable proportion of biochar addition plays a vital role in the quality of compost. There is no report on the exact amount of biochar that can reduce composting costs and improve compost quality

[0005] In addition, at present, crop stalks are mostly used for biocomposting, and after some Chinese herbal medicines use their medicinal parts, the remaining parts without medicinal value (such as stems and leaves of Scutellaria baicalensis, chrysanthemum, etc.) are often not obtained well. These parts are not only rich in trace elements, but also often contain a variety of alkaloids that can kill insects and bacteria, and with the gradual increase in modern people's recognition of traditional Chinese medicine, the demand for medicinal materials is increasing year by year, and the planting area of ​​traditional Chinese medicine It is also expanding day by day, and produces a large amount of medicinal plant wastes every year. However, there is no report on the use of these medicinal plant wastes, such as the preparation of biocompost from stems and leaves of Chinese medicinal materials.