Disclosed is an independent double-negative-pressure shale shaker, and belongs to the technical field of petroleum drilling solid control. The independent double-negative-pressure shale shaker comprises a base, a fluid discharge device, an inclination angle adjustment mechanism, a screening device, an exciting motor and a double-negative-pressure system, wherein the double-negative-pressure system comprises a first negative-pressure system and a second negative-pressure system which are relatively independent; the first negative-pressure system dries drilling fluid of a first screen mesh set close to a material outlet, and the second negative-pressure system increases the treatment capacity of drilling fluid of a second screen mesh set close to the first screen mesh set; and meanwhile, in the deep well section, the second negative-pressure system can be switched to a fluid mist suction state, fluid mist on the screen surface is reduced, the safety is improved, and the pollution of fluid mist is reduced.

A concentration device for concentrating a liquid containing a target object, the concentration device including: a container configured to store the liquid containing the target object; a filter in the container; and a position control portion configured to change a position of the filter in the container.

Under-sink solids separating and compositing devices, systems, and methods. An under-sink solids separating device can include a solids separation housing having a fluid opening and a solids opening positioned along a length of the housing between the top and bottom end. The under-sink solids separating device is configured to separate fluid from solids such that fluid exits the housing via the fluid opening and solids exit the housing via the solids opening. A composting device can be coupled to the solids opening of the separating device or a garbage disposal and can include one or more housings or chambers for grinding or processing the solids, one or more heaters or fans for drying the solids, and optionally a mechanism for compacting the processed solids into pucks.