Solid-state anaerobic digestion of livestock manure and reuse of digested dried manure solids as bedding for dairy cows

生物地球系统公司(BTS)旨在为畜牧业开发节能解决方案， 通过减少温室气体（GHG）排放，并回收养分， 有机肥料很明显，农场越来越难以获得良好的牲畜垫料来源。由于 随着对生物燃料需求的不断增长，这些来源已经开始消失;因此，现有生物燃料的价格 来源增加了。因此，除了可再生能源生产，BTS正在研究一种替代能源， 对环境无不良影响的经济垫料来源。 牛粪与垫料是可再生的有机生物质，可在奶牛场全年使用。发展中 高效和经济的嗜冷干式厌氧消化（PDAD）工艺可以解决 在寒冷气候地区，如 加拿大在本项目中提出了在低温（~ 20 ℃）下的固态AD，因为它导致 除了生产绿色能源外，还可出口干有机肥。 与此同时，农场上仍然有大量粪便，如果经过加工，可能可以用作垫料 通过分离、消化/合成。一些奶牛场已经实施了分离或干燥的消化粪便 固体作为垫层的替代来源。然而，重复使用可能携带病原体和其他 细菌计数负荷对于牛群健康和牛奶质量是重要的。研究表明，液态AD 这些系统有可能减少进入环境的病原体。因此，本拟议项目旨在 从病原体方面验证了消化干粪便固体作为奶牛垫料的可行性， 无异味材料。因此，该项目的成果将有利于BTS和加拿大农业 部门也是。

Bio-Terre Systems Inc. (BTS) aims to develop energy efficient solutions for livestock sectors and preserve the quality of our environment by reducing greenhouse gas (GHG) emissions, and recover nutrients to produce organic fertilizer. It is evident that good livestock bedding sources have become harder for farms to secure. Due to the growing demand for biofuels, these sources have started to disappear; consequently, price of the existing sources has increased. Hence, in addition to the renewable energy production, BTS is investigating an alternate economical bedding source that has no adverse effects on the environment. Cow manure with bedding is renewable organic biomass, available around the year on dairy farms. Developing efficient and cost-effective psychrophilic dry anaerobic digestion (PDAD) processes could resolve the farm-related environmental, energy, and manure management problems in cold-climate regions such as Canada. Solid-state AD at psychrophilic temperature (~20oC) is proposed in this project as it results in exportable dry organic fertilizer in addition to the green energy production. At the same time, there is still plenty of manure on farms that might serve the purpose of bedding if processed by separation, digestion/compositing. Some dairies have implemented separated or dried digested manure solids as an alternate source of bedding. However, re-using bedding that may carry a pathogen and other bacterial count load is significant for the herd health and milk quality. Research has shown that liquid AD systems have the potential to reduce pathogens entering the environment. Thus, this proposed project aims to validate the feasibility of using digested dried manure solids as dairy cow bedding in terms of pathogen and odor free material. Accordingly, the outcomes of this project will benefit BTS and the Canadian agricultural sectors as well.