Provided is a water quality management apparatus for an aquaculture pond, the apparatus having a storage unit for storing water quality-related measured values measured at appropriate time intervals by external sensors set in the aquaculture pond, an assessment unit for calculating a predicted future value on the basis of fluctuations in the measured values and determining the time when the predicted value will exceed a reference value that indicates deterioration of water quality, and a display unit for displaying the time when the reference value will be exceeded. Said time is the time when exchange of pond water will be necessary.

Installation and method for processing wastewater, comprising: a) providing wastewater for processing; b) reducing O2 content of said wastewater by unactivated aerobic digestion; c) subsequently to ‘b’, eliminating substantially all O2 from said wastewater by anaerobic digestion; d) subsequently to ‘c’, transferring said wastewater to a closed photobioreactor; and e) subsequently to ‘d’, maintaining said wastewater in said photobioreactor in conditions favorable for algal photosynthesis, thereby allowing algae to grow in said photobioreactor. A method for growing algae is also disclosed whereby time, density and flow speed are controlled. The photobioreactor may have a conduit with two proportions of different cross sections.

A waste stream is treated by anaerobic digestion. A process is described involves a step of separating solids from digestate, and returning separated solids to a digester. Optionally, there may be a step of solids separation in which larger solids are removed from the digester. A process and apparatus are described for treating waste sludge from a wastewater treatment plant in an anaerobic digester. Feed sludge is thickened or solids are separated from digestate and returned to the digester. Additional co-digestion waste may be added to the digester. The process and apparatus may be used in a retrofit of an existing wastewater treatment plant.

A batch reactor includes a first portion, a second portion, a first drainage tank, a second drainage tank, and a first flow control mechanism. The first portion includes a first chamber, a second chamber, and a third chamber in fluid communication with one another configured for a flow of at least one biomaterial therethrough. The second portion includes a first chamber and a second chamber in fluid communication with one another configured for a flow of the least one biomaterial therethrough. The first drainage chamber is in fluid communication with the first and second chambers. The second drainage chamber is in fluid communication with the third chamber of the first portion and the second chamber of the second portion. The first flow control mechanism is disposed between the third chamber of the first portion and the first chamber of the second portion.

An aquarium filter consists of a housing with three filter elements including a coarse filter, a fine filter and a porous substrate. A pump provides for the flow of water through the filter, so that only part of the flow passes through the porous substrate.

A metals-adsorbent PAN fiber comprising a carbon chain backbone and amidoxime, carboxylate, and nitrile pendant groups. No ester groups are present. The inventive fiber is used for removing metals, including toxic metals, from fresh water, including rivers, streams, lakes, ponds, drinking water from wells and other sources, and industrial discharge waste waters, in a pH range of 3-10, and preferably at slightly acidic conditions in the range of pH 5-6. Metals that can be removed include heavy and toxic metals, such as Sc, V, Mn, Fe, Co, Ni, Cu, Sr, Yb, Cd, Cs, Pb, La, Ce, Nd, Eu, Zn, Tb and U. The adsorbed metals can be removed from the fiber by acidic elution and recovered. The fiber can be rinsed and reused.

Provided are fish tank effluent sampling systems, e.g., for use in recirculating aquaponics systems, methods of using same for sampling effluent, and kits for assembling such an effluent sampling system.

A process in which a waste stream containing microbes and organic constituents is passed through a process environment comprising a solid media, microbes, and higher animals, such that some of the microbes and/or organic constituents within the waste stream are removed from the waste stream and some of the removed microbes are destroyed or consumed by the higher animals. The process environment may include an irrigated environment, a submerged environment, or a combined environment.

Systems, devices, and methods are presented for optimizing the formation of gas nanobubbles in a disinfecting solution. In an example system for treating contaminated water, a centrifugal pump draws the water from a reservoir and circulates the water in and through a circuit of elements including a mixing chamber in the pump, a pressure vessel, a backflow valve, a Venturi injector, and a pair of nozzles immersed in the reservoir. The system injects ozone-rich gas into the fluid to produce an aqueous solution containing a volume of gas nanobubbles. The nozzles release the gas nanobubbles into the reservoir, creating highly reactive compounds that destroy organic compounds and other contaminants in the water.

Embodiments of the present invention feature devices and methods for administering medicaments to subjects and, in particular, molecular iodine to animals in drinking water for the treatment of oral bad breath and disease. An exemplary device comprises a source of medicament in a fluid, measuring means, an administration switch and a water reservoir means. The measuring means is in fluid communication with said source of medicament for measuring an aliquot of medicament corresponding to a dose for the treatment of a disease. The measuring means is also in communication with a water reservoir means and releases the aliquot into the water reservoir means upon signal activation. The administration switch means is in signal communication with the measuring means and upon activation by a subject produces an activation signal received by the measuring means. The water reservoir means is for receiving the aliquot and forming an aqueous solution of medicament.