Described herein are attached growth reactor systems which increase nitrifying bacteria biomass through a variety of means during warm weather. As a consequence, the attached growth reactor system contains sufficient nitrifying bacteria biomass to remove ammonia from wastewater in cold to moderate climates. In one example, there are two attached growth reactors into which wastewater is distributed discontinuously. Specifically, wastewater is transferred to the first attached growth reactor for a first period of time and then is transferred to the second attached growth reactor for a second period of time during warm weather which effectively doubles the nitrifying bacteria biomass in the system. During cold weather, wastewater can be applied to the reactors according to their increased nitrifying bacteria biomass, that is, according to their increased capacity to treat influent wastewater compared to standard operations.

Provided are a water quality purification device, and a water purifier and an aquarium that use the water quality purification device. The water quality purification device includes a component filled with a micro-electrolysis catalyst and a biological filtration component that are connected in series. By utilizing a micro-electrolysis technology, pollutants in water are preprocessed and the biodegradability of the water is improved. A water body processed by the micro-electrolysis catalyst enters the biological filtration component, which can greatly improve the purification efficiency of the biological filter bed. Working together with an adsorption electrode, this structure can effectively stabilize the water quality in the aquarium and greatly reduce the required times of changing water.

The present invention discloses a straight-line sewage treatment system for enhanced treatment of low-carbon-to-nitrogen ratio (C/N) domestic sewage, including a sewage intake tank, an enhanced denitrification tank through a pipeline, an effluent outlet of the enhanced denitrification tank, an effluent pipe, a first storage tank, a second storage tank, and a disinfection tank.

A modular system for aeration and biosource augmentation of a body of water and a method of using the system to prevent or eliminate an algal bloom in a water body include one or more mechanical basins located outside the body of water and at least two of: one or more residence pods submerged in the body of water that aerate the body of water, dose beneficial biosource, host biosource, and provide biosource to the body of water; one or more residence air pods submerged in the body of water that aerate the body of water, host beneficial bacteria, and provide beneficial bacteria to the body of water; and one or more residence nano pods submerged in the body of water that host, the one or more residence pods or the one or more residence air pods in fluid communication with the one or more mechanical basins.

A wastewater treatment apparatus has a tank having an access opening therein, at least one fixed film media pod positioned in the interior of the tank, a diffuser positioned in the interior of the tank, and an air pump connected to the diffuser. The fixed film media pod is formed of a mesh material and has openings framed by the mesh material. At least one weight is affixed to the fixed film media pod adjacent to a bottom thereof so as to maintain a vertical orientation of the fixed film media pod in the tank. The diffuser can be affixed to the fixed film media pod so as to aerate liquid in the interior of the tank.

The present invention relates to a process for refinery wastewater treatment. More particularly, the present invention relates to an automated process for treatment of refinery wastewater. The process of the present invention provides complete automation for controlling different critical parameters that enhance biological activity of activated sludge process (ASP) and helps in significant reduction in sludge recycling that increases the treatment efficiency.

The disclosure herein relates to a helical bed biofilm reactor for wastewater treatment, and belongs to the fields of environment engineering and chemical engineering. The helical bed biofilm reactor comprises a reaction vessel, a draft tube, helical screen meshes, carriers, a carrier passage, a gas distributor, a gas inlet, a gas outlet, a water inlet, a water outlet and a sludge outlet. By improving the arrangement structure of the carriers and the structure of the helical passage, the helical bed biofilm reactor improves the oxygen transfer rate, the oxygen transfer efficiency and the biological reaction efficiency of a biological treatment process of wastewater, and helps to control the thickness of the biofilm and reduce energy consumption in wastewater treatment.

A water treatment system comprising a first reactor and a second reactor arranged to be placed in series in a body of water, the first and/or second reactor comprising at least one cell for housing biomedia. A mid-settling zone is provided between the first and second reactors for separating solids in the water. A method of treating water, the method comprising passing water to be treated through a first reactor and then a second reactor arranged in series in a body of water, the first and/or second reactors comprising at least one cell for housing biomedia, wherein the water is passed through a mid-settling zone between the first and second reactors before passing through the second reactor.

In a waste water treatment method using membrane separation-activated sludge, when, during filtration while supplying air using an immersion-type membrane separation unit loaded with multiple flexible membranes, the filtration differential pressure of the membranes at a set filtration flow rate exceeds a specified value P2 with respect to the filtration differential pressure P1 of the initial period of operation, membrane filtration is continued with air supply stopped until the filtration differential pressure P3 becomes P3P1+20 [kPa]. Then with the filtration flux or filtration pressure being smaller or negative compared to when filtering while supplying air, air is supplied and after the filtration differential pressure P4 during filtration reaches P4P1+5 [kPa], filtration is returned to filtration while supplying air.

Water treatment structures may have at least a first geotextile fabric layer; a second geotextile fabric layer; a third geotextile fabric layer; a first filler layer with plastic particles, arranged between the first and second geotextile fabric layers; and a second filler layer with plastic particles, arranged between the second and third geotextile fabric layers, wherein the geotextile fabric layers and the filler layers are within a housing, and wherein the structure is configured such that contaminated water proceeds sequentially through the first geotextile fabric layer, the first filler layer, the second geotextile fabric layer, the second filler layer, and the third geotextile fabric layer. Methods of treating wastewater may involve passing wastewater, after optional oxygenating and pre-filtering, through such alternating layers of geotextile, preferably nonwoven, and polymer particles.