METHOD AND SYSTEM FOR PRODUCING AND SUPPLYING BIOGAS USING MIXED MICROALGAE

摘要

The objective of the present invention is to provide a method and a system for supplying a biogas, each of which is equipped with microalgae culturing facilities and methane fermentation facilities and appropriately supplies a gas in response to the demand of a biogas user by efficiently producing the biogas under controlled conditions. The objective is achieved by providing: a biogas supply system which is equipped with first and second mixed microalgae culture tanks (1, 2) that are provided with a nutrient source supply means or a carbon dioxide supply means, a concentrated liquid tank (7) for concentrating and storing a microalgae culture solution from the microalgae culture tanks by means of a concentration device, a methane fermentation tank (8) to which the concentrated microalgae culture solution is supplied from the concentrated liquid tank for carrying out methane fermentation, and a biogas holder (15) for storing a methane gas that is generated in the methane fermentation tank; and a method for producing and supplying a biogas using the biogas supply system. According to these method and system for producing and supplying a biogas, a uniform kind of bio starting material for methane fermentation is efficiently prepared by culture of microalgae, and methane fermentation can be carried out under uniform and efficient conditions by using the bio starting material for methane fermentation under homogeneous concentration conditions. Consequently, the biogas can be supplied under controlled conditions through the system.