Devices and methods associated with these devices for significantly reducing or eliminating liquid (e.g., water) in a water or wastewater treatment unit above the underdrain from moving downwardly into the underdrain during an air only wash cycle of the treatment unit. The treatment unit can take many forms including but not limited to an upflow filter and a downflow filter. The treatment unit may include a filter bed having one or more layers of filter media supported by gravel above the underdrain. The treatment unit may also include an underdrain having a porous plate, slotted plate or slotted upper structure that obviates the need for gravel. Positive pressure is provided to the underdrain to overcome the downward force of the driving head in the treatment unit to significantly reduce or prevent liquid present in the treatment unit above the underdrain from moving downwardly into the underdrain.

Devices and methods associated therewith for facilitating movement, removal and/or installation of components from treatment units (e.g., water treatment units and wastewater treatment units). The treatment unit can take the form of a granular media filter (e.g., upflow filter, downflow filter or bi-flow filter) or a sludge collection basin. One preferred device is one or more floats facilitating safe removal of components of a treatment unit. The float(s) can be operably associated with an air scour system of a water filter to remove the air scour system from a granular media filter bed. The float(s) can be operably associated with a collection grid of a sludge collection container facilitating safe removal of the collection grid from the sludge collection container. Another preferred device is a flexible piping/conduit operably connected to a pressurized air source and an air scour system to assist in removal/installation of the air scour system.

A water filtration device comprising a drum housing a removable canister containing a replaceable water filter media. A pair of lifting handle/media stops, connected to the removable canister, pivotally secure the replaceable water filter media, enabling a user to lift the removable canister from the drum and remove the replaceable water filter media. The drum is located along and connected to a water circulating line comprising a water supply line and a water discharge line. Unfiltered water is circulated into the water filtration device, creating the filtered water circulating into the water discharge line to the decorative water feature thereby re-circulating the unfiltered water from the water filtration device as filtered water back through a decorative water feature to a water feature terminus. As unfiltered water is pumped from the water feature terminus, it again passes through the replaceable water filter media.

The invention provides an apparatus and method for purification of a fluid, the apparatus comprising: a vessel (1) for receiving, in operation, a filter bed (2) with granular filter material; a transport system (8) configured to, during operation, transport filter material from a cavity (5) underneath the filter bed (2) to a location (17) above the filter bed; a fluid inlet (14) for introducing fluid to be purified into the apparatus; a mixing section (3) adapted to, in operation, provide a mixture of fluid from the fluid inlet and granular filter material from the filter bed in a part of the vessel beneath the mixing section; and a plurality of gas lift injectors (4), wherein each gas lift injector (4) is configured to, in operation, transport the mixture of fluid from the fluid inlet (14) and granular filter material from the filter bed (2) to the cavity (5).

The invention provides an apparatus and method for purification of a fluid, the apparatus comprising: a vessel (1) for receiving, in operation, a filter bed (2) with granular filter material; a transport system (8) configured to, during operation, transport filter material from a cavity (5) underneath the filter bed (2) to a location (17) above the filter bed; a fluid inlet (14) for introducing fluid to be purified into the apparatus; a mixing section (3) adapted to, in operation, provide a mixture of fluid from the fluid inlet and granular filter material from the filter bed in a part of the vessel beneath the mixing section; and a plurality of gas lift injectors (4), wherein each gas lift injector (4) is configured to, in operation, transport the mixture of fluid from the fluid inlet (14) and granular filter material from the filter bed (2) to the cavity (5).

A method for forming a filter for passing contaminated water using a device and one or more media. The device comprises of one or more elements that are capable of undergoing degradation. The increased area available for flow is obtained by adding a first media to predetermined areas of the device and allowing the elements to undergo degradation to bring about an increase in the area available for passing the contaminated water.

A method for forming a filter for passing contaminated water using a device and one or more media. The device comprises of one or more elements that are capable of undergoing degradation. The increased area available for flow is obtained by adding a first media to predetermined areas of the device and allowing the elements to undergo degradation to bring about an increase in the area available for passing the contaminated water.

The filtration system of the present invention comprises first and second filtration tanks. The first filtration tank has a first floating filter media layer, a first upper screen with a first aperture ratio, a first inlet, a first backwash water supply source, and a first backwash water outlet means. The second filtration tank has a second floating filter media layer, a second upper screen with a second aperture ratio, a second inlet, an inflow blocking mechanism capable of blocking inflow of water to be treated through the second inlet, a second backwash water supply source, and a second backwash water outlet means. The first aperture ratio is smaller than the second aperture ratio.

The filtration system of the present invention comprises first and second filtration tanks. The first filtration tank has a first floating filter media layer, a first upper screen with a first aperture ratio, a first inlet, a first backwash water supply source, and a first backwash water outlet means. The second filtration tank has a second floating filter media layer, a second upper screen with a second aperture ratio, a second inlet, an inflow blocking mechanism capable of blocking inflow of water to be treated through the second inlet, a second backwash water supply source, and a second backwash water outlet means. The first aperture ratio is smaller than the second aperture ratio.

Vaults, boxes, chambers, systems, and methods of treatment systems to capture pollutants from storm water runoff and prevent the conveyance of these pollutants from entering a receiving water body or landscape area, which is designed to be a part of a local permanent storm water drainage infrastructure. The system enhances the removal efficiency of almost any type of filtration media by increasing contact time between storm water runoff and the media, and also offers an easy and inexpensive method for serving the media, without having to remove or replace the media. A media filter can include a bottom screen, a media layer, and at least one top lid that can be opened to allow for backwashing of the media layer without removing the media layer from the filter. A servicing system can include pivotal spray heads to pivot to parallel positions over a sloped floor to flush debris toward easy to reach locations to be vacuumed, and vertical spray heads which can break up debris bridges.