A device for treating wastewater liquids, the device comprising a housing (4) incorporating a membrane supported biofilm reactor (MSBR) (2) of the type comprising a lumen containing a gas phase, a liquid phase, and a gas permeable membrane (20) providing an interface between the gas and liquid phases; and a means (6) for mixing the wastewater liquids in the device, wherein the means (6) for mixing the wastewater liquids is configured to create a mixing intensity sufficient to ensure that there is contact between the membrane (20) and the wastewater liquid to be treated.

A wastewater treatment device for decomposing solid matter using aerobic microorganisms in a bacteria bed, includes a decomposition tank that accommodates the solid matter obtained by crushing food waste and the bacteria bed, a water supply capable of supplying water to the decomposition tank, and a stirrer for stirring the solid matter and the bacteria bed in the decomposition tank. The bacteria bed includes a carrier made of a synthetic resin having a plurality of pores and microorganisms carried in the plurality of the pores.

A water treatment unit has a support housing vertically extending between a support housing upper end and a support housing lower end. The support housing includes a pair of opposing primary housing walls and a pair of opposing secondary housing walls. Each of the secondary housing walls is formed separately from, and mechanically joined to, each of the primary housing walls. Each of the primary housing walls is perforated to allow airflow in a first direction laterally through a treatment cavity defined by the housing walls. A plurality of hangers extend in the first direction between the primary housing walls and are supported by the support housing. The hangers are mutually spaced between the secondary housing walls across the treatment cavity (23). A plurality of biotreatment membranes each carry a biomass culture and are draped over, and supported by, one of the hangers to define two opposing membrane walls each extending downwardly from the hanger.

A bioreactor assembly for treating feed water including: i) a pressure vessel comprising an inner peripheral surface defining an inner chamber having a cross-sectional area, and a first and second port adapted to provide fluid access with the inner chamber, ii) a plurality of bioreactors located within the inner chamber, wherein each bioreactor includes an outer periphery and flow channels extending along bio-growth surfaces from an inlet region to an outlet region, and iii) a fluid flow pathway adapted for connection to a source of feed water and extending from the first port of the pressure vessel, along a parallel flow pattern to each bioreactor, into the flow channels of each bioreactor, and out the second port of the pressure vessel.

There is described a bioreactor comprising a perforated tube for inputting wastewater therein, a textured wall, such as a geotextile membrane, and an oxygenating unit comprising a pressurized air bubble diffuser. The wall is spirally installed around the perforated tube, defining a passageway fluidly connected to the perforated tube and along which the wastewater inputted in the perforated tube is forced to travel. The membrane is adapted for hosting aerobic bacteria at a surface thereof. The oxygenating unit is provided at a bottom of the passageway for oxygenating the passageway. The bioreactor can be included in a treatment apparatus comprising primary treatment chambers and a decantation chambers, forming a standalone unit which is compact and easy to install.

An electrode assembly includes a hollow member having a hollow portion, an oxygen supply portion that supplies oxygen to the hollow portion, and an oxygen permeable portion that allows permeation of oxygen supplied to the hollow portion. Moreover, the electrode assembly includes: an electrode that is provided on an outside of the hollow member in the oxygen permeable portion and is composed by laminating a water-repellent layer having oxygen permeability and an electrically conductive layer on each other from the oxygen permeable portion side; and a buffer member that is provided in the hollow portion and has pressure resistance. Then, the electrode assembly is provided with air permeability from the oxygen supply portion to the oxygen permeable portion. A microbial fuel cell includes: the electrode assembly; and a negative electrode that supports microorganisms.

Provided is a clogging resistant biofilm-based water treatment system. The system includes a membrane-enclosed water flow pathway including at least one water-impermeable, oxygen-permeable membrane wall portion extending along the pathway and at least another wall portion extending along at least part of the pathway. According to the subject matter provided, biofilm growth and consequent clogging generally takes place along the water-impermeable, oxygen-permeable membrane wall portion and biofilm growth and clogging does not take place along the another wall portion.

Wastewater with high ammonia concentration is pre-treated before discharging it into a wastewater treatment plant treating lower strength wastewater, for example an activated sludge plant treating municipal sewage. The high strength wastewater is pre-treated to oxidize ammonia by contact with a fixed film supported on gas transfer membranes in a membrane aerated biofilm reactor. The pre-treatment may be a batch or continuous process. The pre-treatment can be controlled to remove ammonia to about the point of material alkalinity depletion. One or more parameters such as alkalinity, pH, or membrane exhaust oxygen concentration can be monitored to determine if alkalinity depletion has occurred or is about to occur. In some examples, the high strength wastewater is blended with wastewater having less ammonia and more alkalinity, for example municipal sewage or primary effluent. In some examples, the high strength wastewater is a liquid fraction of one or more sludges.

The present invention relates to systems and methods for catalytic removal of per- and polyfluoroalkyl substances (PFAS) from water and wastewater. The system and methods utilize a catalyst film and a biofilm to synergystically remove PFAS from water. In some aspects, the catalyst film reduces and defluorinates PFAS into less fluorinated counterparts of PFAS, and the biofilm metabolizes the less fluroinated counterparts of PFAS into CO.sub.2 or shorter chain PFAS.

Provided is a water treatment module including a bundle of hollow fiber membranes that includes a treatment portion extending between bottom and top ends and at least one gas diffuser. The membranes may be gas permeable and water impermeable. At least one end of the hollow fiber membranes is linked to a source of biofilm growth-supporting gas (BGSG) and configured to permit inlet of said BGSG into the hollow fiber membranes. Also provided herein are devices, systems and methods making use of the module.