Machine for emptying, washing and sanitizing of the portable tanks used in the toilets of recreational vehicles (for example, campers, motor homes, caravans and boats), characterized by a structure widi sliding door, in which the tank is inserted; the machine comprises sensors capable of detecting the type of the tank inserted. The washing procedure starts by rotating the pour-out spout, unscrewing the lid and lifting the tank into a vertical position, thus emptying it into the drainage system. A coupling mask then automatically slides open the lid and opens all the valves and sealing plugs. A lance then injects water and detergent at high pressure inside the tank, thus washing inside. The machine then washes the outside of the tank and of the cap of the same, filling it widi sanitizing liquids, drying and re-delivering it to the user through its completely automated, electronically-controlled method thus guaranteeing hygiene and safety. The machine provides for direct connection to the sewerage system or to a collecting tank and backup systems for electricity and water supplies.

Systems, devices, and methods for providing nutrient removals in an up flow filtration storm water system for treating water to very high clean levels using filtration media. A filtration media can be supported by a screen above a floor in a vault allows for incoming storm water to pass into a void space above the floor into the screen and filtration media and then out an outlet to the vault. The filtration media can include recyclable and/or natural particles. Layers of river rocks can be placed on top of and below the filtration media. The captured debris can drop to the floor. The long lasting filtration media can be cleaned by being backwashed.

The instant application pertains to a pressure relief door for a waste water treatment system. The pressure relief door comprises a pressure relief door frame configured to be attached to a baffle wall or a tank floor or a tank cover. A pressure relief door cover is attached to the pressure relief door frame with a hinge and axle. At least one torsion spring is attached to the pressure relief door cover so that the pressure relief door is allowed to open only when the pressure on the pressure relief door cover exceeds a predetermined pressure.

Systems, devices, and methods for providing nutrient removals in an up flow filtration storm water system for treating water to very high clean levels using filtration media. A filtration media can be supported by a screen above a floor in a vault allows for incoming storm water to pass into a void space above the floor into the screen and filtration media and then out an outlet to the vault. The filtration media can include recyclable and/or natural particles. A top screen can be placed on top of the filtration media. Layers of river rocks can be placed on top of and below the filtration media. The captured debris can drop to the floor. The long lasting filtration media can be cleaned by being backwashed.

A device for emptying a sewer well that comprises a lower relatively heavy fraction and an upper relatively light fraction, the device comprising a lower suction nozzle with a lower suction opening for removing the lower fraction, said lower suction nozzle being connected to a pump, characterized in that at a position remote from the lower suction nozzle the device comprises an upper suction nozzle for removing the upper fraction.

System for drainage of surface water, the system comprises a number of tanks being connected to a main pipeline leading water to a recipient. Each tank has at least one outlet for leading water from the tank to the main pipeline, and a corresponding lid, the lid is limiting the outlet until the water is at a predetermined level in the tank. The system further comprises a check valve arranged downstream of the outlet of each tank, preventing water from entering the tank from the main pipeline, and at least one air bleeder valve and at least one siphonic drainage regulator arranged between a tank and the recipient.

System for drainage of surface water, the system comprises a number of tanks being connected to a main pipeline leading water to a recipient. Each tank has at least one outlet for leading water from the tank to the main pipeline, and a corresponding lid, the lid is limiting the outlet until the water is at a predetermined level in the tank. The system further comprises a check valve arranged downstream of the outlet of each tank, preventing water from entering the tank from the main pipeline, and at least one air bleeder valve and at least one siphonic drainage regulator arranged between a tank and the recipient.

Systems, devices, and methods for providing nutrient removals in an up flow filtration storm water system for treating water to very high clean levels using filtration media. A filtration media can be supported by a screen above a floor in a vault allows for incoming storm water to pass into a void space above the floor into the screen and filtration media and then out an outlet to the vault. The filtration media can include recyclable and/or natural particles. Layers of river rocks can be placed on top of and below the filtration media. The captured debris can drop to the floor. The long lasting filtration media can be cleaned by being backwashed.

A prerotation basin for use in a sump pit or wet well includes a basin body having an upstanding exterior wall, an interior concavity for placement of a pump inlet therein, and a fluid entry channel formed in the basin body defined by a discontinuity in the upstanding exterior wall, where the fluid entry channel has a channel floor, the threshold of which is at an elevation that is equal to or lower than the elevation of the bottom surface of the interior concavity. The prerotation basin thereby provides a channel floor that slopes upwardly toward the bottom surface of the interior concavity to provide better solids entrainment in fluid being processed from the sump pit or wet well, and to provide self-flushing of the basin.

Machine for emptying, washing and sanitizing of the portable tanks used in the toilets of recreational vehicles (for example, campers, motor homes, caravans and boats), characterized by a structure widi sliding door, in which the tank is inserted; the machine comprises sensors capable of detecting the type of the tank inserted. The washing procedure starts by rotating the pour-out spout, unscrewing the lid and lifting the tank into a vertical position, thus emptying it into the drainage system. A coupling mask then automatically slides open the lid and opens all the valves and sealing plugs. A lance then injects water and detergent at high pressure inside the tank, thus washing inside. The machine then washes the outside of the tank and of the cap of the same, filling it widi sanitizing liquids, drying and re-delivering it to the user through its completely automated, electronically-controlled method thus guaranteeing hygiene and safety. The machine provides for direct connection to the sewerage system or to a collecting tank and backup systems for electricity and water supplies.