A method and a device for adherent culture of microalgae in a thin liquid layer by mobile mechanical stirring, comprising: a subsystem for adherent culture of microalgae in thin liquid layer, for adherent culture of microalgae in a culture solution, comprising a microalgae liquid pool and a culture plate used as a base plate for microalgae seed inoculation, adherent culture, microalgae harvesting, the microalgae liquid pool containing culture solution having a water layer with a depth in a range of 1{tilde over ()}5 cm, forming a thin liquid layer; and a subsystem for mechanical stirring, comprising a mechanical stirring assembly, a moving assembly, a track member, a power drive assembly, a control assembly, the moving assembly moving on the track member to drive the mechanical stirring assembly to stir and suspend the microalgae, the microalgae standing and gradually settling to the bottom after stirring, realizing adherent culture in suspension and settlement cycle.

The present disclosure teaches a method and system for mitigating methane emissions from natural or artificial bodies of water by promoting the growth of MOB. The presently disclosed method includes: measuring a baseline level of methane emissions in a target body of water; measuring characteristics in the target body of water; based on the characteristics, selecting a suitable species or strain of MOB; determining a baseline amount of MOB in the target body of water; if the baseline amount of MOB is below a threshold, seeding an amount of MOB; placing and operating aerators in the target body of water; adding or attenuating nutrients to or from the target body of water; monitoring the growth of MOB and characteristics of the target body of water over time, and based on these measurements, seeding an additional amount of MOB, adjusting the operation of aerators, and/or adding an additional amount of nutrients.