The present invention relates to a process and device for selectively removal of deflocculated sludge below a pre-selected size from a sludge mixed liquor. The invention resides in the concept of removing from the sludge mixed liquor deflocculated sludge. The removal is preferably carried out by a two-step separation providing a fraction comprising sludge flocs, substantially freed from deflocculated sludge, and a fraction containing mostly deflocculated sludge. The fraction comprising sludge flocs is returned into the sludge mixed liquor, while the fraction containing mostly deflocculated sludge is removed from the system.

The present invention relates to a process and device for selectively removal of deflocculated sludge below a pre-selected size from a sludge mixed liquor. The invention resides in the concept of removing from the sludge mixed liquor deflocculated sludge. The removal is preferably carried out by a two-step separation providing a fraction comprising sludge flocs, substantially freed from deflocculated sludge, and a fraction containing mostly deflocculated sludge. The fraction comprising sludge flocs is returned into the sludge mixed liquor, while the fraction containing mostly deflocculated sludge is removed from the system.

A device and method for shortcut nitrogen removal and nitrite-oxidizing bacteria activity inhibition are disclosed herein. An embodiment of the present invention provides a hollow fiber diffuser comprising: a plurality of hollow fibers on which bacteria can be attached and grow; and an inlet capable of supplying gas to one sides of the plurality of hollow fibers, wherein the gas includes oxygen and carbon dioxide, nitrite can be produced by the oxygen, and the concentration of oxygen in the gas is adjusted by the oxygen and the carbon dioxide.

A device and method for shortcut nitrogen removal and nitrite-oxidizing bacteria activity inhibition are disclosed herein. An embodiment of the present invention provides a hollow fiber diffuser comprising: a plurality of hollow fibers on which bacteria can be attached and grow; and an inlet capable of supplying gas to one sides of the plurality of hollow fibers, wherein the gas includes oxygen and carbon dioxide, nitrite can be produced by the oxygen, and the concentration of oxygen in the gas is adjusted by the oxygen and the carbon dioxide.

A bubble generating device for sewage purification includes: an outer cylinder 6 vertically placed in water; an injection port 2A placed at a lower central portion in the outer cylinder 6 for upwardly injecting air as bubble flow supplied from an air supply source; and microbubble generating device 3 placed higher than the injection port 2A for refining bubbles injected from the injection port 2A. A throat portion 30 for narrowing a flow path of bubble flow and water flow which rises in the outer cylinder 6 is placed between the injection port 2A and the microbubble generating device 3.

A bubble generating device for sewage purification includes: an outer cylinder 6 vertically placed in water; an injection port 2A placed at a lower central portion in the outer cylinder 6 for upwardly injecting air as bubble flow supplied from an air supply source; and microbubble generating device 3 placed higher than the injection port 2A for refining bubbles injected from the injection port 2A. A throat portion 30 for narrowing a flow path of bubble flow and water flow which rises in the outer cylinder 6 is placed between the injection port 2A and the microbubble generating device 3.

A wastewater treatment system includes a blower providing air to an aerator and a low pressure pulsed air mixer. The invention generally relates to a wastewater treatment system and more particularly to a wastewater treatment system to eliminate biological and nutrient contaminants from wastewater.

A wastewater treatment system includes a blower providing air to an aerator and a low pressure pulsed air mixer. The invention generally relates to a wastewater treatment system and more particularly to a wastewater treatment system to eliminate biological and nutrient contaminants from wastewater.

Systems for use in one or more sludge or waste collection devices (e.g., containers, vessels or basins). One such system is a sludge removal system for removing sludge from one or more sludge collection devices. The sludge removal system includes one or more sludge removal grids disposed in one or more sludge collection devices. Each sludge removal grid preferably includes at least one header and a plurality of sludge collection laterals. Another such system includes a fluid distribution system for distributing one or more fluids in one or more sludge or waste collection devices. A movement restricting or prevention member is provided in both the fluid distribution and sludge removal systems to prevent or restrict movement of the sludge collection laterals and the fluid distribution laterals away from or towards a floor of a corresponding collection device without anchoring or fixing the laterals to the floor.

Systems for use in one or more sludge or waste collection devices (e.g., containers, vessels or basins). One such system is a sludge removal system for removing sludge from one or more sludge collection devices. The sludge removal system includes one or more sludge removal grids disposed in one or more sludge collection devices. Each sludge removal grid preferably includes at least one header and a plurality of sludge collection laterals. Another such system includes a fluid distribution system for distributing one or more fluids in one or more sludge or waste collection devices. A movement restricting or prevention member is provided in both the fluid distribution and sludge removal systems to prevent or restrict movement of the sludge collection laterals and the fluid distribution laterals away from or towards a floor of a corresponding collection device without anchoring or fixing the laterals to the floor.