Systems and methods for supplying primary fuel and secondary fuel to an internal combustion engine may include supplying a first amount of the primary fuel and a second amount of the secondary fuel to the internal combustion engine. The system may include a first manifold to provide primary fuel to the internal combustion engine, and a primary valve associated with the first manifold to provide fluid flow between a primary fuel source and the internal combustion engine. A second manifold may provide secondary fuel to the internal combustion engine, and a fuel pump and/or a secondary valve may provide fluid flow between a secondary fuel source and the internal combustion engine. A controller may determine a total power load, the first amount of primary fuel, and the second amount of secondary fuel to supply to the internal combustion engine to meet the total power load.

Systems and methods to enhance the flow of fracturing fluid into a wellhead during a high-pressure fracturing operation may include providing a pump frame and a crankshaft. A plurality of first plungers may be connected to the crankshaft and may reciprocate in a first plane. The hydraulic fracturing pump also may include a plurality of second plungers connected to the crankshaft and positioned to reciprocate in a second plane. The first plane and the second plane may define a non-zero offset angle between the first plane and the second plane. The crankshaft may include a plurality of crankpins, and each of the crankpins may be connected to one of the first plungers and one of the second plungers. The first plungers may pump a first fracturing fluid and the second plungers may pump a second fracturing fluid different from the first fracturing fluid.

Systems and methods to enhance the flow of fracturing fluid into a wellhead during a high-pressure fracturing operation may include providing a pump frame and a crankshaft. A plurality of first plungers may be connected to the crankshaft and may reciprocate in a first plane. The hydraulic fracturing pump also may include a plurality of second plungers connected to the crankshaft and positioned to reciprocate in a second plane. The first plane and the second plane may define a non-zero offset angle between the first plane and the second plane. The crankshaft may include a plurality of crankpins, and each of the crankpins may be connected to one of the first plungers and one of the second plungers. The first plungers may pump a first fracturing fluid and the second plungers may pump a second fracturing fluid different from the first fracturing fluid.

A pump for dispensing a fluid, has a pump head , a piston body with a piston, a pump chamber limited by a pump chamber body, an inlet valve and an outlet valve, the piston being moveable by respective movement of the pump head between an upper starting position and a lower end position. A return stroke force for a return stroke from the lower end position into the upper starting position is provided by a bellows, formed by two bellows arranged one above the other, Each of the bellows is folded up, when moving the pump head into the lower end position, by exerting a compression force on the pump head, the first bellows receiving the compression force by direct engagement with the pump head, the second bellows receiving the compression force only by engagement with the first bellows.

A system for using biogases produced as a part of the wastewater treatment process is described. The gasses produced during the anaerobic treatment of wastewater are collected, conditioned, optionally compressed, and combusted in an engine designed for the combustion of biogases. Mechanical power produced by the engine is then used to directly power one or more devices used in the wastewater treatment process such as aerators, mixers, compressors, and the like.

A system for using biogases produced as a part of the wastewater treatment process is described. The gasses produced during the anaerobic treatment of wastewater are collected, conditioned, optionally compressed, and combusted in an engine designed for the combustion of biogases. Mechanical power produced by the engine is then used to directly power one or more devices used in the wastewater treatment process such as aerators, mixers, compressors, and the like.

Provided is a novel electroosmotic pump capable of being driven by AC voltage. An electroosmotic pump (2) includes a porous dielectric membrane (21), a first water-permeable electrode (22), and a second water-permeable electrode (23). The first water-permeable electrode (22) is disposed on one side of the porous dielectric membrane (21). The second water-permeable electrode (23) is disposed on the other side of the porous dielectric membrane (21). A principal surface of the porous dielectric membrane (21) close to the first water-permeable electrode (22) and a principal surface thereof close to the second water-permeable electrode (23) have mutually different hydrophilicities.

Provided is a novel electroosmotic pump capable of being driven by AC voltage. An electroosmotic pump (2) includes a porous dielectric membrane (21), a first water-permeable electrode (22), and a second water-permeable electrode (23). The first water-permeable electrode (22) is disposed on one side of the porous dielectric membrane (21). The second water-permeable electrode (23) is disposed on the other side of the porous dielectric membrane (21). A principal surface of the porous dielectric membrane (21) close to the first water-permeable electrode (22) and a principal surface thereof close to the second water-permeable electrode (23) have mutually different hydrophilicities.

A fluid pumping system may include an electroosmotic pump; and a separation member provided at least one end of the electroosmotic pump, and configured to separate the fluid and a transfer target fluid. The electroosmotic pump may include: a membrane that allows a fluid to move therethrough; and a first electrode and a second electrode which are respectively provided at two opposite sides of the membrane, and each of which is formed of a porous material or has a porous structure to allow a fluid to move therethrough; each of the first electrode and the second electrode may be made of porous carbon only; and an electrochemical reaction of the first electrode and the second electrode may take place as a cation is moved in a direction whereby a charge balance is established.

A fluid pumping system may include an electroosmotic pump; and a separation member provided at least one end of the electroosmotic pump, and configured to separate the fluid and a transfer target fluid. The electroosmotic pump may include: a membrane that allows a fluid to move therethrough; and a first electrode and a second electrode which are respectively provided at two opposite sides of the membrane, and each of which is formed of a porous material or has a porous structure to allow a fluid to move therethrough; each of the first electrode and the second electrode may be made of porous carbon only; and an electrochemical reaction of the first electrode and the second electrode may take place as a cation is moved in a direction whereby a charge balance is established.