Biogas process with nutrient recovery

The invention is a method of two-phase anaerobic digestion where monitoring and adjusting the nitrogen status (carbon to nitrogen molar ratio, i.e. C/N molar ratio or total or ammoniacal nitrogen content) enables maintaining optimum conditions during the process. The method improves the use of a variety of feedstock materials or facilitates monodigestion of one feedstock. Especially the introduction of nitrogen rich feedstock materials in the process is amended. A community of hydrolyzing and acidogenic microorganisms in the first phase digester performs ammonification i.e. release of organic nitrogen as ammonia. Nitrogen and phosphorus are removed and recovered from the digestate which then undergoes biogasification in the second phase of the process. Reject water from biogasification can be recycled within the process. 本发明是种两相厌氧消化的方法，其中监控和调节氮状态(碳氮摩尔比，即C/N摩尔比或总氮或总氨氮含量)能够在工艺期间保持最优条件。该方法改进了各种原料材料的使用或者有利于种原料的单消化。特别地，修改了工艺中富氮原料材料的引入。第阶段消化器中的水解和产酸微生物的群落进行氨化，即将有机氮释放为氨。从沼渣中去除并回收氮和磷，然后它们在工艺的第二阶段经历生物气化。来自生物气化的废水可以在工艺