A method for appropriately controlling an aeration volume for activated sludge on which aeration treatment is conducted while DO of an activated sludge mixed liquor in an aeration tank is being adjusted to substantially 0 mg/l (ultralow DO treatment). The method includes the following steps. An aeration volume correlation (G=F(Gr)) between an aeration tank and a measuring device is acquired in advance. A sample of activated sludge mixed liquor taken during ultralow DO treatment operation is temporarily intensely aerated in the measuring device and then aeration is stopped. Based on temporal changes in the measuring device DO value, an oxygen consumption rate Rr and an equilibrium DO value C1 are calculated. An appropriate aeration volume G2* of the testing device is acquired by using an EaG relationship formula and the like obtained in advance. An appropriate aeration volume Gr2* of the aeration tank is obtained by using the relationship G=F(Gr).

A wastewater treatment system including a contact tank, a dissolved air flotation unit, a fermentation unit, and a biological treatment unit is disclosed. A method of retrofitting a wastewater treatment system by arranging the wastewater treatment system such that floated biosolids are fermented in an anerobic environment and fluidly connecting the biological treatment unit to receive at least a portion of the fermented solids is also disclosed. The method optionally includes providing a fermentation unit and fluidly connecting the fermentation unit to a biological treatment unit. A method of treating wastewater including combining the wastewater with activated sludge, floating biosolids from the activated wastewater, fermenting the floated biosolids, and biologically treating the effluent with the fermented solids is also disclosed. A method of facilitating delivery of soluble organic carbon to a biological treatment unit is also disclosed.

A reflux unit and a sewage treatment system are disclosed. The reflux unit includes an input section, a treatment section and an output section which are sequentially communicated. The treatment section is configured for deoxidizing a reflux substance input by the input section. The treatment section is at least partially located above an aeration port of an aeration device or the treatment section is attached to a surface of the aeration device.

Systems and methods for enabling dynamic treatment of substances are disclosed. Such treatment conditions may include, by way of example, systems and methods for dynamically aerating wastewater within zones of a system in response to the operating parameters of at least one downstream zone.

The present disclosure relates to a sewage/wastewater treatment system using granular activated sludge and a membrane bio-reactor and a sewage/wastewater treatment method using the same that are configured to effectively remove pollutants contained in raw water through a granulation tank in which the granular activated sludge is contained and to allow the raw water to be filtered through movable membranes located on the upper portion of the granulation tank. The system includes: an indirect aeration tank adapted to supply air thereto to allow dissolved oxygen contained in raw water to reach a saturation concentration; a granulation tank adapted to allow floating microorganisms contained in the treated water passing through the indirect aeration tank to be granulated and having a sludge blanket formed thereon; and movable membranes located on the upper portion of the granulation tank in such a manner as to be movable in the granulation tank.

An ink removal device preferably includes a tube housing, a plurality of glass chunks and an injector tube. The injector tube is retained in the tube housing. A liquid inlet connector is secured to a first end of the tube housing for a supply of ink water. An air inlet connector is secured to a second end of the tube housing for a supply of pressurized air. The tube housing is filled with a plurality of large chunks of glass. Pressurized ink water is pumped into the tube housing passes through the injector tube and back through the plurality of glass chunks. The ink in the ink water adheres to the plurality of glass chunks to produce cleaned water. The pressurized air dries the ink adhering to the plurality of glass chunks. The cleaned water exits the outlet port to be used for printing operations.

There is provided a filtration system comprising a reaction and separation apparatus (2) for processing a solid-liquid mixture (4) to separate solids from liquid, the reaction and separation apparatus (2) comprising: a tank (6) comprising an inlet (8) and an outlet (10), the inlet (8) configured for receiving the solid-liquid mixture (4) into the tank (6), the outlet (10) configured for permitting liquid to exit the tank (6); and a sedimentation device (16) including a liquid conduit (18), the liquid conduit (18) having a first end (20) and a second end (22), the first end (20) configured to be in liquid communication with the outlet (10), the second end (22) configured for dispensing liquid from the liquid conduit (18), wherein the second end (22) is positioned higher than the first end (20) so that the liquid conduit (18) extends from the first end (20) to the second end (22) along a vertical axis or along an inclined axis relative to the horizontal, wherein the filtration system further comprises a preparatory filter (642) configured to, in use, receive an inflow liquid (644) from an external source and separate the inflow liquid (644) into the solid-liquid mixture (4) and a filtered liquid (646), wherein the preparatory filter (642) is configured to dispense the solid-liquid mixture (4) into the tank (6) via the inlet (8).

Equipment and a method for on-site and ex-situ modulation of microbial consortia useful in liquid and semi-solid effluents or solid waste treatment systems, for removing and/or reusing undesirable organic or inorganic loads. The equipment has of a main cultivation tank or a liquid body provided with an ex-situ subsystem for modulating microbial consortia for subsequent or concomitant introduction into the main cultivation tank or reactor or into the liquid body. The process is implemented in a culture equipment with controlled conditions for introducing the microorganism-enriched material into the effluent or solid waste to be treated, in the form of pre-cultivation and/or co-cultivation. The ex-situ subsystem of the invention has a device for forming gas/air bubbles in a liquid suitable for applying a shearing force to the microorganisms present in the subsystem, and also useful for modulating the microbial consortia in a main cultivation tank or a liquid body.

A water treatment system includes: a first water quality measurement value acquisition unit which acquires a water quality measurement value at a first time point, of treatment target water; a water quality variation pattern acquisition unit which, acquires a plurality of water quality variation patterns; an inflow water quality estimation unit which selects a water quality variation pattern that matches an acquisition condition for the water quality measurement value at the first time point, from the water quality variation patterns in the water quality variation pattern acquisition unit, and estimates an inflow water quality value subsequent to the first time point from the selected water quality variation pattern; and a control unit which controls an aeration amount from a blower to a reaction tank subsequent to the first time point, on the basis of the estimated inflow water quality value.

Increased control and efficiency over the wastewater purification can be achieved by allowing to selectively prioritize catabolic over anabolic processes via prioritization of the digestive function of microorganism in the activated sludge. The gas-dispersion return sludge is created using pure oxygen or oxygen containing trace amounts of ozone, which is blended with return sludge to create a mixture of gas and liquid, which is passed through an atomizer or a pump to instantly render the reactive gas to an ultra-fine bubble state. At least a portion of the ultra-fine bubbles dissolve within the sludge, raising oxygen to a critical level within a short time, activating the dormant microorganisms. The microorganism accumulate enough cATP upon initial encounter with the pollutants to prioritize their digestive function, and when exposed to pollutants present in wastewater, digest the pollutants using biochemical pathways different from the ones used in nature.