NOVELTY - Energy-saving fully automatic quantitative material dispatching system, comprises an aerobic coupled photobioreactor, a ventilating deaerator and a methane fermentation tank which are sequentially and vertically arranged. The aerobic coupled photobioreactor is connected with the ventilating deaerator through a pipeline A. The ventilating deaerator is connected with the methane fermentation tank through a pipeline B. The methane fermentation tank is connected with an air storage tank through a pipeline C and connected with the aerobic coupled photobioreactor through a return pipeline D.    USE - Used as an energy-saving fully automatic quantitative material dispatching system.    ADVANTAGE - The system has fully-automatic operation of the integral system, and can drive the quantitative conveyance of all materials by methane pressure energy inside the system through coupled methane pressure, fluid gravity and liquid level control, does not require energy from the outside of the system, and saves labor efficiency.    DETAILED DESCRIPTION - Energy-saving fully automatic quantitative material dispatching system comprises an aerobic coupled photobioreactor, a ventilating deaerator and a methane fermentation tank which are sequentially and vertically arranged. The aerobic coupled photobioreactor is connected with the ventilating deaerator through a pipeline A. The ventilating deaerator is connected with the methane fermentation tank through a pipeline B. The methane fermentation tank is connected with an air storage tank through a pipeline C and connected with the aerobic coupled photobioreactor through a return pipeline D. The pipelines A, B, C and D are all connected with a liquid level control mechanism. Microalgae is cultured in the aerobic coupled photobioreactor by photosynthesis using a medium containing inorganic carbon dioxide, water and nutrients under the sun light irradiation to obtain the microalgae suspension, where the liquid level control mechanism controls the opening of pipelines a, b and c, and closing the return pipeline d. The microalgae and aerobic bacterial suspension from the photobioreactor flow into the ventilating deaerator via the pipeline A under the action of its own gravity, simultaneously flowing the suspension in the ventilating deaerator into the marsh gas fermentation tank via the pipeline B under the influence of , the previous cycle generated enter into storage tank through pipeline c its own gravity, when the aerobic coupled light bioreactor liquid level is reduced to the whole reactor effective volume of 10-90%, the liquid level control mechanism automatically closes the pipelines A, B and C, opens the return pipeline D. The biogas fermentation is carried out in the marsh gas fermentation tank by gradually increasing the marsh gas pressure, gradually refluxing the marsh gas into the aerobic coupled photobioreactor through the return pipeline D, where the liquid level of the marsh gas fermentation tank is gradually reduced and aerobic coupled optical bioreactor is gradually increased during the marsh gas fermentation process. The proliferated microalgae in the aerobic coupled optical bioreactor when exposed to sunlight and aerobic bacteria oxidize organic matter into carbon dioxide and water, and then oxidizes nutrient into inorganic state. The microalgae and aerobic bacteria removes dissolved oxygen by respiration, the liquid level control mechanism is automatically closes return pipeline d and opens the pipelines A, B and C when the liquid level in the aerobic coupled optical bioreactor rises to the effective volume of 100% of the whole reactor, and then enters into the next circulation.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the energy-saving fully automatic quantitative material dispatching system (Drawing includes non-English language text).