An advanced oxidation water treatment system includes an ozone reaction tank; a first hydrogen peroxide supplier which supplies hydrogen peroxide to treatment water in a supply line supplying the treatment water to the ozone reaction tank; an ozone generator which generates and supplies an ozonized gas containing ozone to the ozone reaction tank; a second hydrogen peroxide supplier which can supply additional hydrogen peroxide to the ozone reaction tank downstream of where the ozonized gas is supplied; a meter which measures water quality of the treatment water at a location downstream of where the ozonized gas is supplied; and a controller which determines whether and how much additional hydrogen peroxide is to be supplied by the second hydrogen peroxide supplier based on the water quality measured by the meter, and to control the second hydrogen peroxide supplier accordingly.

A method for enhancing nitrogen removal by denitrification in a horizontal subsurface-flow constructed wetland, which includes three treatment steps of strain acclimation, strain screening and strain pouring. Firstly, the enrichment of aerobic denitrifying bacteria is achieved through acclimation culture, and the denitrification advantages of the strains are improved to obtain acclimated strains; meanwhile in the present technical solution, after obtained, the acclimated strains are screened for multiple times to remove aging strains and some strains incapable of performing denitrification from sludge and obtain strains truly having good denitrification effects as strains to be poured; and finally the strains to be poured as obtained by the screening is combined with a biocarrier to obtain an immobilized filler and thus prevent the strains from loss.

A method of making an aqueous mixture of ozone and water comprising pumping a solution of ozonated water through a high cavitation rate homogenizing device, thereby causing formation of gas phase nanobubbles of ozone in the solution. The high cavitation rate homogenizing device may be a homogenizing mixer. The high cavitation rate homogenizing device may be comprised of rotors and stators moving in close proximity relative to each other and separated by the solution of ozonated water. The relative motion of the rotors and stators may cause up to 500 million cavitation events per second in the solution of ozonated water, thereby causing the formation of gas phase nanobubbles of ozone. A computer-implemented method of treating waste water from a source is also disclosed. The method may include making the aqueous mixture of ozone and water.

In the field of wastewater or effluent treatment, a method for treating wastewater includes a first step of treating carbon contained in the wastewater by means of oxygen, a second step of treating the nitrogen contained in the treated water at the end of the first step, a third step of determining a ratio between a concentration of carbon and a concentration of nitrogen in the water at the end of the first step, a fourth step of controlling the supply of oxygen necessary for the first step as a function of a difference between the determination carried out in the third step and a strictly positive setpoint of concentration ratio. A device implementing the method is also provided.

A diaphragm valve includes a valve body including a valve cavity and first and second ports, and a valve assembly disposed to seal the valve cavity. The valve assembly includes a valve seat, a seat carrier and a diaphragm, with the valve seat being retained with said seat carrier and disposed to surround the first port and including a flow passage in fluid communication with the first port. The seat carrier includes an annular body having an outer rim and a web that extends radially inward from the outer rim to a central opening, the central opening being aligned with the first port. The web includes a plurality of flow passages separated by lands about said central opening. Each land has a surface area that is less than a cross-sectional area of said second port so as to reduce obstruction of flow when the land overlays the second port.

Methods and systems for electrochemical treatment of fertigation water for use and for recycling in agricultural systems such as in controlled environment agricultural systems.

Disclosed are apparatus and methods for treating wastewater. In one example a system for treating wastewater treatment is provided. The system comprises a biological reactor having an inlet in fluid communication with a source of wastewater and an outlet, the biological reactor configured to treat wastewater from the source of wastewater and output a biologically treated wastewater from the outlet, a solids-liquid separation system having an inlet in fluid communication with the outlet of the biological reactor and configured to separate the biologically treated wastewater into a solids-lean effluent and a solids-rich waste activated sludge (WAS), a treatment subsystem comprising a digester, an inlet in fluid communication with a WAS outlet of the solids-liquid separation system, and an outlet for providing ballasted and digested WAS, and a ballast feed system configured to deliver ballast to one of the biological reactor and the treatment subsystem.

A water network monitor, monitoring system and method comprising: at least one sensor operable to sense one or more parameters of a water network; and an analyser to analyse data points recorded over time from the water network by the at least one sensor, the analyser having an input comprising the data points recorded over time from the water network and an output comprising an event probability P(event) that an event has occurred which affects the water network from which the data points were recorded, the analyser comprising: an outlier detector to determine a measure of abnormality (D) from an outlier detection algorithm for each of the data points; and an outlier decay discriminator (ODD) to calculate an outlier probability (Po) for each of the data points based on each data points measure of abnormality (D), wherein the outlier probability is decayed over time, the output of the ODD comprising an event probability P(event), wherein P(event) is based on the decayed outlier probability.

Provided is a method for treating water containing a low-molecular-weight organic substance which enables the low-molecular-weight organic substance to be removed with certainty at a sufficient level without subjecting the water to a biological treatment. A method for treating water containing a low-molecular-weight organic substance, the method comprising passing raw water to a high-pressure reverse-osmosis-membrane separation device, the raw water containing a low-molecular-weight organic substance having a molecular weight of 200 or less at a concentration of 0.5 mgC/L or more, wherein an amount of brine discharged from a reverse-osmosis-membrane module (5a) disposed at an end of a final stage of the high-pressure reverse-osmosis-membrane separation device is 2.1 m.sup.3/(m.sup.2.Math.D) or more.

Methods of treating water having organic contaminants are disclosed. The methods include performing a first treatment on the water effective to oxidize a predetermined amount of the organic contaminant and electrochemically treating the water. The methods include introducing a hydrogen peroxide (H.sub.2O.sub.2) containing reagent into the water, allowing the H.sub.2O.sub.2 containing reagent to react with the organic contaminant for a reaction time effective to oxidize a predetermined amount of the organic contaminant, and electrochemically treating the water. Systems for treating water are also disclosed. The systems include an electrochemical cell, a source of an H.sub.2O.sub.2 containing reagent upstream from the electrochemical cell, and a controller operable to regulate a reaction time of the H.sub.2O.sub.2 containing reagent in the water and a potential applied to the electrochemical cell.