The principle of gas-recombination, the reason of desiccation and the influence of desiccation are analyzed, methods preventing VRLA battery from desiccation are also put forward.

During the separation process,the injected micro air bubble will capture fine oil droplet to form oil-gas compound body,which will move toward the center of the hydrocyclone under the function of centrifugal force,so as to fulfill the cooperating effect of floatation and hydrocyclonic separation,and to ensure the high efficient separation of oil from water.