The invention relates to a method and system for phosphate recovery from a stream such as waste flow, sewage or another sludge stream. The method comprises the steps of: providing an incoming stream comprising an initial amount of phosphate; dosing/controlling iron salt to the stream such that precipitates are formed in the stream, wherein the precipitates comprise vivianite like structures comprising more than 60% of the initial amount of phosphate in the incoming stream, and preferably also the steps of: separating the vivianite like structures from the stream; and recovering the phosphates from the separated vivianite like structures.

A method for controlling a process, comprising treatment of a process medium, and which includes a system input, in particular, an inlet, and a system output, in particular, an outlet for the process includes such a dead time profile that a change in at least one parameter of the first type of the process medium at the system input causes a change in at least one parameter of the second type of the process medium at the system output only after an elapse of a dead time, comprises: determining, in particular, digital values for the parameter of the first type and using these values as input values of a control system; determining the set values for an output variable influencing the parameter of the second type of the process medium at the system output, using the determined values of the parameter of a first type and a first proportionality factor recorded in the control system; applying the determined set values for adjusting the output variable using the control system; determining, in particular, digital values for the parameters of the second type; determining the deviation values, which are representative of a deviation of the parameter of the second type from the parameter of the first type, from the determined values of the parameter of the first type and the determined values of the parameter of the second type; and use of at least one of the deviation values and at least one of the set values to determine a second proportionality factor.

According to some embodiments, a system for desalination of a liquid comprises at least one primary treatment process, at least one secondary treatment process, wherein the at least one secondary treatment process comprises at least one reactor, and at least one tertiary treatment process, wherein the at least one primary treatment process is configured to adjust a pH of the liquid to target pH level and to add at least one chemical additive to the liquid, wherein the at least one reactor is configured to heat the liquid to a temperature of at least 350 F. and to supply a pressure to the liquid to maintain the liquid in a liquid state, and wherein the dissolved salt of the liquid is configured to react with at least a portion of the at least one chemical additive to form an insoluble product within the at least one reactor.

Embodiments of the present inventive concept provides a water treating device for treating a circulating water including a storage tank configured to store the circulating water, a first filter configured to filter the circulating water discharged by the storage tank, a phosphorus removing device configured to remove phosphorus contained in the circulating water, and an ultraviolet ray irradiation device configured to irradiate an ultraviolet ray to the circulating water.

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 invention discloses a method to provide a consortium containing heterotrophic nitrifying and aerobic denitrifying microorganisms from an activated sludge originating from effluent treatment plants. The microbial consortium is capable of removing ammoniacal nitrogen from substrates with high salinity with superior efficiency. Thus, the microbial consortium from the described method can be applied to purify hypersaline effluents contaminated with nitrogen. Therefore, the use of the microorganism consortium provided to remove ammoniacal nitrogen from hypersaline effluents and a method therefor are also part of the scope of the invention.

A method for controlling a treatment process of a medium that includes a system input and output, wherein a change in a first parameter of the medium at the system input causes a change in a second parameter at the system output only after an elapse of a dead time, and a control system, the method including determining first values of the first parameter; determining set values for an output variable influencing the second parameter at the system output using the determined first values and a first proportionality factor recorded in the control system; applying the determined set values to adjust the output variable; determining second values of the second parameters; determining deviation values representative of a deviation of the second parameter from the first parameter; and using at least one of the deviation values and at least one of the set values to determine a second proportionality factor.

A method for removing polyvinylpyrrolidone (PVP) from water using rare earth salts, iron salts, or mixtures thereof effectively and efficiently removes undesired and dissolved PVP and provides a composition containing hydrolyzed PVP (h-PVP) having ions bound thereto. In these compositions the ions include rare earth cations, iron cations, and mixtures thereof. This composition is beneficial in the removal of aqueous contaminants, such as phosphate, other phosphorus containing compounds, arsenic, arsenic containing compounds, fluorides, and PFAS from water.

Systems, methods, and software that measure a plurality of error values each related to a different condition of an aquatic environment monitoring system including a degradation in a chemical indicator due to photo-aging, a degradation in a chemical indicator due to water-aging, a physical contamination of a chemical indicator, an illumination imbalance related to an optical reader, a degradation of a light source of an optical reader, a contamination in water between an optical reader and a chemical indicator, a displacement due to friction between a chemical indicator apparatus and a monitoring unit, an error intrinsic in a chemical indicator, and an error in distance between a chemical indicator and an optical reader. The plurality of error values are used to determine a confidence level that is compared to a threshold value associated with the monitoring system. A correction instruction is generated for correcting one or more of the conditions.

A process for biological nutrient removal including: receiving fluid having sludge in a basin through a sludge inlet; activating an aeration system based at least partially on a time of day; periodically measuring a potassium level of the fluid; determining a potassium rate of change based on the periodic measurements of potassium level; and deactivating the aeration system based at least partially on the determined potassium rate of change. A system for biological nutrient removal is also disclosed.