During the period of "the Tenth Five Year Plan", "the Eleventh Five Year Plan" and "the Twelfth Five Year Plan", more than 30 billion yuan has been invested in the central budget to support the development of rural household biogas.

随着城镇化的快速推进和农业生产方式、农村居住方式、农民用能方式的变化，农村户用沼气的正常使用和持续发展问题日益突显，缺少后续投入，沼气技工加速流失，配套服务失去保障，众多农村户用沼气出现建而不用，闲置荒废等诸多问题，无法持续发挥效益，造成了财政资金浪费。

With the rapid development of urbanization and the changes of agricultural production mode, rural residential mode and farmers' energy use mode, the problems of normal use and sustainable development of rural household biogas are increasingly prominent, such as the lack of follow-up investment, the accelerated loss of biogas technicians, the loss of supporting services, many rural household biogas problems such as construction without use, idle waste and so on, which cannot continue to play their benefits , causing a waste of financial funds.

从分散式家庭制沼气到集约化处理畜禽粪污，规模化沼气工程需求日益增长，尤其是以沼气提纯为方向的工业化生物天然气是未来发展的。沼气经提纯后的生物天然气与化石天然气在燃料属性上几乎没有差异，具有高价值、率、易接入的特点，是对农村户用沼气和传统沼气工程的优化升级。此外，生物天然气的沼液沼渣等副产物可用于生产有机肥，能够改良土壤、培肥地力、增加农作物产量与农产品质量，加快有机肥推广应用，替代化肥，是推动农业绿色发展的重要举措。加快推进生物天然气产业化发展，对于实现循环农业、促进畜禽粪污资源化利用、治理农村人居环境、增加可再生能源消费、降低天然气对外依存度、解决北方地区冬季清洁取暖等多个方面具有积极作用。

From decentralized household biogas to intensive treatment of livestock and poultry manure, the demand for large-scale biogas projects is growing day by day, especially the industrial bio natural gas with biogas purification as the direction is the focus of future development. There is almost no difference in fuel properties between the purified biogas and fossil natural gas, which has the characteristics of high value, high efficiency and easy access. It is the optimization and upgrading of rural household biogas and traditional biogas projects. In addition, biogas byproducts such as biogas slurry and biogas residue can be used to produce organic fertilizer, which can improve soil and fertility, increase crop yield and quality of agricultural products, accelerate the application of organic fertilizer, and replace chemical fertilizer, which is an important measure to promote the green development of agriculture. Accelerating the industrialization of biological natural gas will play a positive role in realizing circular agriculture, promoting the utilization of livestock and poultry manure resources, harnessing the rural living environment, increasing the consumption of renewable energy, reducing the dependence of natural gas on foreign countries, and solving the problem of clean heating in winter in northern China.