阅读说明：本技术 一种基于园林生物质厌氧发酵制备沼气的方法 (Method for preparing biogas based on garden biomass anaerobic fermentation ) 是由 宋英今 孟姝妍 王彩玉 陈冠益 于 2019-10-09 设计创作，主要内容包括：本发明公开了一种基于园林生物质厌氧发酵制备沼气的方法,包括如下步骤：(1)对园林生物质进行晾晒、粉碎,得到原料；(2)将原料放置于厌氧发酵容器中,添加污泥接种物,混合,得到发酵物料,调节C/N比,调节pH；(3)通入氮气排出空气,密封厌氧发酵容器,反应,收集沼气。本发明利用园林生物质为原料,实现了对生物质废弃物的多方位、高效率利用,减轻环境污染,缓解了当前园林生物质资源化利用率低的问题。本发明的方法,投资较小,处理方式较为缓和。本发明产沼气为清洁能源环保无污染,用途广泛,除直接燃烧用于炊事、烘干农副产品、供暖、照明和气焊等外,还可作内燃机的燃料以及生产甲醇、福尔马林、四氯化碳等化工原料。(The invention discloses a method for preparing biogas based on garden biomass anaerobic fermentation, which comprises the following steps: (1) drying and crushing garden biomass to obtain a raw material; (2) placing the raw materials in an anaerobic fermentation container, adding a sludge inoculum, mixing to obtain a fermented material, adjusting the C/N ratio, and adjusting the pH; (3) introducing nitrogen to discharge air, sealing the anaerobic fermentation container, reacting, and collecting biogas. The invention utilizes the garden biomass as the raw material, realizes the multi-directional and high-efficiency utilization of the biomass waste, lightens the environmental pollution and relieves the problem of low resource utilization rate of the garden biomass at present. The method of the invention has the advantages of less investment and mild treatment mode. The methane produced by the invention is clean energy, environment-friendly and pollution-free, has wide application, can be directly combusted for cooking, drying agricultural and sideline products, heating, lighting, gas welding and the like, and can also be used as fuel of an internal combustion engine and chemical raw materials for producing methanol, formalin, carbon tetrachloride and the like.)

1. A method for preparing biogas based on garden biomass anaerobic fermentation is characterized by comprising the following steps:

(1) airing and crushing garden biomass to obtain a raw material with the solid content of 88-90%;

(2) placing the raw material obtained in the step (1) into an anaerobic fermentation container, adding a sludge inoculum with the solid content of 8-10%, wherein the mass ratio of the raw material to the sludge inoculum is 1: 10-12, mixing to obtain a fermented material, and adjusting the C/N ratio to 20-25: 1, adjusting the pH value to 6.8-7.1;

(3) introducing nitrogen to discharge air, sealing the anaerobic fermentation container, reacting for 32-35 days at 35-37 ℃, and collecting methane.

2. The method of claim 1, wherein the sludge inoculum is prepared by the following method: taking sludge of a sewage plant as anaerobic fermentation seed sludge, placing the seed sludge in an anaerobic fermentation container, and adding water; stirring at 37 ℃ and 10-15rpm for 5-7 days to obtain a sludge inoculum, and storing at 4 ℃ for later use.

Technical Field

The invention relates to a method for preparing biogas based on garden biomass anaerobic fermentation, and belongs to the field of solid waste treatment and recycling.

Background

Landscape biomass is a typical lignocellulosic mixed biomass, consisting primarily of leaves, branches and lignocellulosic debris from grass clippings, hedge cuttings, tree pruning and the environment. With the enlargement of the areas of cities and greenbelts in China, the quantity of the biomass is continuously increased, the annual output of garden biomass in China is 1800 million tons, a large amount of research is carried out to realize resource utilization, and the energy conversion of garden waste in urban areas can reduce the burden of treatment cost and reduce the energy crisis. However, because part of the technology is still immature, a large amount of garden biomass is still burned, which causes environmental pollution and resource waste. The garden biomass contains abundant lignocellulose, the cellulose content accounts for 40%, the hemicellulose content accounts for 20% -30%, and the lignin content accounts for 25% -30%.

Municipal sludge refers to sludge generated during operation and maintenance of municipal facilities in and relating to urban life activities, and can be classified into sewage plant sludge, water supply plant sludge, drainage pipeline sludge, building sludge and the like according to sources. Landfill, incineration, heat drying, fermentation composting and the like are the main measures for disposing the sludge in China at present, and the operation management technology is complex, the cost is higher, and the occupied area of the treatment process is large.

The traditional garden biomass treatment method mainly comprises incineration and landfill, and environmental problems such as air pollution, land occupation, water pollution and the like are caused generally. The anaerobic fermentation technology is used as a mature resource technology at present, the fermentation microorganisms can efficiently degrade lignocellulose in garden biomass, the energy consumption is low, and the water content of municipal sludge is high. Both are advantageous raw materials for preparing fuel gas by anaerobic fermentation. Most researches are based on anaerobic co-fermentation of garden biomass and other wastes such as kitchen waste, livestock and poultry manure and the like, but the garden biomass is various in types, and the research of independently using the garden biomass as an anaerobic fermentation substrate is less, and in addition, the research on the influence of the storage temperature of the garden biomass on the anaerobic fermentation gas production effect is not available.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a method for preparing biogas based on garden biomass anaerobic fermentation, which is environment-friendly, pollution-free, simple and convenient to operate and capable of realizing multidirectional and high-efficiency utilization of garden biomass.

The technical scheme of the invention is summarized as follows:

a method for preparing biogas based on garden biomass anaerobic fermentation comprises the following steps:

(1) airing and crushing garden biomass to obtain a raw material with the solid content of 88-90%;

(2) placing the raw material obtained in the step (1) into an anaerobic fermentation container, adding a sludge inoculum with the solid content of 8-10%, wherein the mass ratio of the raw material to the sludge inoculum is 1: 10-12, mixing to obtain a fermented material, and adjusting the C/N ratio to 20-25: 1, adjusting the pH value to 6.8-7.1;

(3) introducing nitrogen to discharge air, sealing the anaerobic fermentation container, reacting for 32-35 days at 35-37 ℃, and collecting methane.

The sludge inoculum is prepared by the following method: taking sludge of a sewage plant as anaerobic fermentation seed sludge, placing the seed sludge in an anaerobic fermentation container, and adding water; stirring at 37 ℃ and 10-15rpm for 5-7 days to obtain a sludge inoculum, and storing at 4 ℃ for later use.

The invention has the advantages that:

1. the invention utilizes the garden biomass as the raw material, realizes the multi-directional and high-efficiency utilization of the biomass waste, lightens the environmental pollution and relieves the problem of low resource utilization rate of the garden biomass at present.

2. The method of the invention has the advantages of less investment and mild treatment mode.

3. The invention adopts the anaerobic fermentation of municipal sludge and garden biomass, produces biogas which is clean energy, is environment-friendly and pollution-free, has wide application, can be directly combusted for cooking, drying agricultural and sideline products, heating, lighting, gas welding and the like, and can also be used as fuel of an internal combustion engine and chemical raw materials for producing methanol, formalin, carbon tetrachloride and the like.

Detailed Description

The present invention will be further described with reference to the following examples. The following examples are intended to enable those skilled in the art to better understand the present invention, but are not intended to limit the present invention in any way.

The sludge of the sewage plant used in the invention is obtained from sludge treatment plant of Tianjinnan, but the invention is not limited, and other sludge of the sewage plant can be used in the invention.