Disclosed is an efficient nitrogen and phosphorus removal process system for mariculture tail water treatment. The process system comprises a physical filtering device, an efficient biological treatment unit, a flocculation sedimentation tank, a sand filtering tank, a clean water tank and a sludge tank, wherein the physical filtering device, the efficient biological treatment unit, the flocculation sedimentation tank, the sand filtering tank and the clean water tank are sequentially connected; the physical filtering device, the efficient biological treatment unit, the flocculation sedimentation tank and the sand filtering tank are all connected with the sludge tank through pipelines, and the physical filtering device and the sand filtering tank are both connected with the clean water tank through pipelines. The efficient biological treatment unit is filled with a modified high-hydrophilic wear-resistant filler, and the whole system is provided with a carbon source, a flocculation agent and a directional Phoslock dosing device.

A vacuum airlift system for treating an aqueous effluent includes an upflow liquid portion, where the upflow liquid portion is configured to retain a fluid, and a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid portion, where the fluid inlet is positioned at about a bottom of the upflow liquid portion. The vacuum airlift system can also include a downflow liquid portion, where the downflow liquid portion is fluidly coupled with the upflow liquid portion, and a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid portion, where the fluid outlet is positioned at about a bottom of the downflow liquid portion. The vacuum airlift system can also include a plurality of aerators fed by one or more fluidic oscillators; the plurality of aerators being coupled to the upflow liquid column.

One or more systems are described for filtering waste water, and related methods. A system is described that includes at least one effluent feed line configured to receive an effluent liquid to be filtered and extending into a respective filter body, a particulate medium or bed disposed and retained in filter body by retention means for retaining the particulate medium or bed at or adjacent to a top portion of the filter body. A method is described that includes feeding effluent through an effluent feed line into a lower portion of a filter body in which is disposed a particulate medium or bed, retaining the particulate medium or bed in filter body while overflowing filtered output from the filter body through an outlet of the filter body, and initiating a media wash cycle.

Aeration systems and kits for aeration systems are disclosed. Methods of making and using aeration systems and kits for aeration systems are also disclosed.

A recirculating aquaculture system comprising a microorganism growing apparatus and a method of using microorganisms to remove a pollutant from a fluid utilized in a recirculating aquaculture system. Furthermore, the microorganisms are harvested and used as a foodstuff fertilizer, biofuels, and bioplastics.

A vacuum airlift system for treating an aqueous effluent includes an upflow liquid portion, where the upflow liquid portion is configured to retain a fluid, and a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid portion, where the fluid inlet is positioned at about a bottom of the upflow liquid portion. The vacuum airlift system can also include a downflow liquid portion, where the downflow liquid portion is fluidly coupled with the upflow liquid portion, and a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid portion, where the fluid outlet is positioned at about a bottom of the downflow liquid portion. The vacuum airlift system can also include a photobioreactor fluidly coupled with the downflow liquid portion such that the fluid is configured to pass through the upflow liquid portion, into the downflow liquid portion, and into the photobioreactor.

Embodiments include a vacuum airlift system for treating an aqueous effluent including an upflow liquid column, where the upflow liquid column is configured to retain a fluid, a fluid inlet, the fluid inlet being fluidly coupled with the upflow liquid column, where the fluid inlet is positioned at about the bottom of the upflow liquid column, a downflow liquid column, a fluid outlet, the fluid outlet being fluidly coupled with the downflow liquid column, wherein the fluid outlet is positioned at about the bottom of the downflow liquid column, and a plurality of moving bed biofilm reactors, the plurality of moving bed biofilm reactors being positioned in the upflow liquid column or the downflow liquid column.

The present invention relates to a biological filtration process for water loaded with nitrogenous pollutants in order to reduce the global nitrogen content of said water, characterised in that it comprises a first step of nitritation and filtration carried out in a first aerated biological reactor, a second step of deammonification, denitrification and filtration carried out in a second non-aerated biological reactor, and a step of evaluation of the ratio of the nitrite content to the ammoniacal nitrogen content of the water at the outlet of the first reactor. When this ratio is greater than a predetermined stoichiometry value, the process according to the invention comprises a step of addition of water to be treated to the water originating from the first reactor so as to obtain, at the inlet of the second reactor, a mixture having a ratio of the nitrite content to the ammoniacal nitrogen content that is close to the stoichiometric ratio of the Anammox reaction.

A process for treating sulphate containing effluent, which includes receiving a sulphide containing effluent into a two-phase fluidised bed reactor containing particles and floating media, permitting calcium carbonate from the effluent to precipitate on particles in the first fluidised bed reactor, aerating the solution in the reactor to remove CO.sub.2 from the solution, thereby to increase the pH in the reactor, permitting biological sulphide oxidation to occur on the floating media by means of sulphide oxidizing bacteria thereby to produce elemental sulphur, recycling the fluidised bed reactor at a sufficient rate to effect abrasion to remove elemental sulphur from the floating media, harvesting the sulphur from a top portion of the reactor, recycling hydroxyl ions internally in solution in to enhance calcium carbonate precipitation by further increasing the pH.

An aerobic treatment system includes a plurality of highly porous, high surface area, inert, synthetic, inorganic, or natural material particles, having a specific gravity of less than 1.0 that float on an enclosed aqueous environment whereby plants and/or microbes can be grown thereon and/or animals such as fish can be raised therein. The inert particles trap air bubbles and nutrients for the growth of diverse types of plants, animals, or microbial systems, which enable phyto treatment of an aqueous waterbody with the ability to limit the growth of unwanted plant and algae such as blue-green algae. The above aerobic bio treatment system contains desirably bioremediation media having one or more microorganisms that are able to withstand system shocks while minimizing energy usage associated with aeration. The system can generally be utilized in any aqueous environment such as waste water and/or polluted water in an enclosed area such as a container, tank, pond, lake, or the like.