Abstract: A process and system for enhanced nitrogen removal in a wetlands wastewater treatment facility is disclosed. Air is bubbled into the wetland to form an overall aerobic zone to enhance nitrification of the ammonia in the wastewater. A portion of the effluent is recycled back to the nutrient rich, anaerobic zone of the inlet of the wetland to enhance denitrification of the wastewater.

Abstract: A method of controlling the operation of a spa water treating system, where such treating is selected from the group: iv) water filtration v) water sanitizing vi) water heating and that includes the steps: a) determining a desired water treating time interval as a function of timing of spa water prior treating interval, or usage, b) and treating the spa water as a function of said determined time interval.

Abstract: The invention is a process for treating waste slurry generated in the electric furnace production of phosphorus in which a superatmospheric reactor is operated at an elevated temperature to destroy cyanides, phosphorus, and phosphides present in the waste. The process transforms wastes from the phosphorus electric furnace process into non-hazardous solid, liquid, and gaseous wastes that meet environmental regulatory requirements regarding solids for phosphorous, cyanide, phosphine and cyanide flux, and TCLP metals, and regarding the filtrate for UTS metals.

Abstract: In a method of removing organic and biological contaminants from a liquid, an oxidizing gas is formed into sub-micron size bubbles which are dispersed into an initially contaminated liquid, after which the treated liquid is recovered. The oxidizing gas is preferably selected from a group including ozone and chlorine dioxide and is utilized immediately upon its manufacture. An oxidizing liquid may be employed in conjunction with the oxidizing gas. The method may be practiced repeatedly. A base may be added to the contaminated liquid to raise the pH thereof.

Abstract: A finely divided mesh cloth of bronze, brass, and/or copper is employed in the water circulation system of a fish tank and thereby prevent/inhibit/remove algae formation or outright kill these types of organisms, besides functioning as a filter. The process and apparatus may also be used in hot tub spas, water ponds or slews, etc.

Abstract: Ascorbic acid or one of its isomers, such as erythorbic acid is added in sufficient quantities to a chlorite-containing solution to rid the solution of chlorite. Sufficient ascorbic acid is added to the chlorite-containing solution to convert the chlorite to chloride. Industrial processes employing this process are disclosed.

Abstract: The present invention relates to a method of defluoridation of waste water, including a step of acid neutralization between a basic neutralization step and a decantation step.

Abstract: A method and apparatus for providing a preliminary separation of production fluid. A vessel (1) has an annular inlet (5) opening upwardly at the bottom of the vessel. The inlet has means (4) for causing the mixture to swirl to generate a vortex. A first outlet (8) for an oil continuous flow is provided at the center of the annular inlet. A second outlet (10) for a water continuous phase is provided towards the bottom of the vessel and spaced from the first outlet. The oil and water are separated under centrifugal forces caused by the swirl and the oil is drawn down through the center of the vortex for discharge through the first outlet (8).

Abstract: A method of processing waste water comprises atomizing waste water under selected atmospheric conditions to achieve substantially complete phase change of the water. The atomization is conducted by spraying waste water from a nozzle mounted on a tower adjacent a catchment area for collecting ice crystals produced by the phase change of the atomized waste water into ice crystals, under atmospheric conditions favorable to freezing of atomized water droplets into ice.

Abstract: A mobile debris collection machine which has an improved filter system includes a chassis, wheels for supporting the chassis, an operator controlled debris pickup on the chassis and a debris container on the chassis. There is a vacuum system for carrying debris from the pickup to the container, with the vacuum system including a vacuum fan located above the debris container for creating an air stream that moves dust and debris from the pickup toward the container. A filter system for removing dust and debris from the airstream includes a first filter stage formed of a rotating perforated member, a second filter stage that is located downstream of the vacuum fan and includes a mesh filter bag, and a third filter stage, located downstream from the second filter stage and including a pleated panel filter.

Abstract: A temporary silt guard for temporarily enclosing the open upper end of a drop inlet during the construction of a road system in commercial and residential developments is adapted to fit over and seat upon the open end of the drop inlet to enable runoff water to drain into the drop inlet while preventing silt and debris from being carried into and collected therein. The silt guard includes a body portion formed from a series of spaced slats defining radially spaced passages through the silt guard. A filter cover is received over the silt guard, formed from a silt screen material, with the slats of the body portion providing rigidity and strength to the filter cover. The filter cover filters out silt and debris while enabling storm water and runoff to drain into the drop inlet.

Abstract: The invention relates to a process for the preparation and delivery of ozonated water to at least one user point, according to which a storage buffer tank is provided for the ozonated water, and an upstream ozonation loop is provided, making it possible to feed the tank with ozonated water, the upstream ozonation loop comprising a component for controling the flow of water flowing in the loop. A fresh-water supply line is also provided, connected by its downstream part to the upstream ozonation loop and fitted with a component for interrupting the freshwater flow, the loop portion located between the tank and the connection point of the fresh-water supply line being fitted with a component for interrupting the recirculation flow upstream of the tank.

Abstract: The present invention relates to a method for treating waste water including the steps of: oxidizing the waste water, and then treating the oxidized waste water with a reverse osmosis membrane having high salt rejection rate. By being treated with the reverse osmosis membrane, the waste water is separated into a impermeated liquid which contains a oxidizable substance, and a permeated liquid which contains almost no oxidizable substance.

Abstract: A gas-liquid contacting apparatus of a column system, comprising a column having an inlet for introducing a liquid to be treated and an outlet for a discharged gas in an upper part thereof, and an inlet for introducing a gas and an outlet for a treated liquid after gas-liquid contact in a lower part thereof, and at least two units comprising a packing material or a wetted wall structure, said units being separated by a gas back mixing preventer plate between the upper and lower parts, wherein the liquid introduced and the gas introduced are brought into countercurrent contact while keeping the gas phase as a continuous phase; and a process for producing an ozone liquid, a process for oxidizing an organic substance in a liquid, a process for removing a gas dissolved in a liquid, a process for treating a volatile substance in a liquid, a process for dissolving a gas into a liquid, each using the same.

Abstract: A carded nonwoven filter media comprising one or more layers of core-sheath fibers wherein the sheath portion of a fiber is bonded to one or more adjacent core fibers is disclosed. In a preferred embodiment, the nonwoven filter media includes an antimicrobial fiber component.

Abstract: An apparatus and methods for sanitizing and cleaning filtration systems is provided. The apparatus includes a chamber fluidly connected to a source of fluid for backwashing the system, and a heat exchanger for increasing the temperature of the fluid. A filter media is positioned within the chamber. The method of sanitization involves backwashing the apparatus to remove debris, then continuing to circulate the backwash fluid through the system while increasing the temperature of the fluid, until the temperature of the water and apparatus is sufficient to deactivate microorganisms. The method may also involve increasing the disinfecting power of the fluid by adjusting the pH of the fluid. The apparatus may be provided with a scavenger to assist in the substantially complete removal of fluid from the chamber during and after a steaming or cleaning process.

Abstract: The process of this invention destroys contaminants in a contaminant-containing aqueous stream. The subject process comprises providing a contaminant-containing aqueous feed stream including an initial amount of at least one of a group of contaminants including perchlorates, nitrates, and nitrites. The contaminant-containing aqueous feed stream includes a reducing agent. Next the reducing agent-containing, contaminant-containing aqueous stream is heated. Finally, the heated contaminant-containing aqueous stream is contacted with an oxidation-reduction catalyst for a period of time sufficient for reducing the excess amount of any of the perchlorates, nitrates, and nitrites contaminants by at least about 90%.

Abstract: Aqueous industrial, recreational, and/or drilling systems comprise a synergistic combination of an oxidizing agent and an alkylamine. In the synergistic combination, the MBEC of the oxidizing agent preferably is about 25%, more preferably about 50% reduced compared to the MBEC of the oxidizing agent in the absence of the alkylamine. Similarly, the MBEC of the alkylamine in the synergistic combination is about 20%, preferably about 10%, more preferably about 1%, and most preferably about 0.5% of the MBEC of the alkylamine in the absence of the oxidizing agent. Preferred alkylamines are primary fatty alkylamines, most preferably octylamine. Preferred oxidizing agents are HOCl and HOBr. The oxidizing agent preferably is maintained at a concentration sufficient to provide static control over biofilm formation with periodic addition of the alkylamine.

Abstract: A water treatment process for raw water containing dissolved Fe2+ and H+ cations to reduce the Fe2+ cation concentration therein involves oxidation of the Fe2cations to Fe3+ cations with the formation in the water of solid Fe(OH)3 from the Fe3+ cations. The process comprises the steps of oxygenating the water and raising the pH of the water. The oxidation of the Fe2+ cations and the fromation of the Fe(OH)3 are carried out in the presence of suspended particulate material in the water, the particulate material being present in the water at a concentration of at least 5 g/l.

Abstract: A water treatment method uses a removable, disposable cartridge having an internal mesh structure. A disposable heater heats water fed to the cartridge. Precipitated solids collect on the mesh surface provided temperature and residence time are appropriately maintained. The heat breaks down the bicarbonate hardness of the water thereby depositing carbonates on the mesh surface and heavy metals will be codeposited due to the resultant change in pH. The cartridge has a head-space for collecting entrained gases such as volatile or Manic compounds, chlorine and air. Water sterility is achieved by heating the water over an appropriate period of time. Turbidity is removed within the cartridge due to settling induced by the low fluid velocity controlled by a controller and by a filter provided at the outlet of the cartridge. The filter will become blocked when bicarbonate hardness is carried over forcing a user to replace a spent cartridge.