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| Number | Title | Issue Date |
| 5021163 | Catalytic destruction of sulfur-oxygen anions Anions containing sulfur and oxygen, e.g. thiosulfate, can be catalytically reduced using a protonated anion ion exchange resin as a catalyst. The process is preferably conducted in an aqueous system and at a pH below about 8.... | 06/04/1991 |
| 5000858 | Method for removing hexavalent chromium from water A system and method for removing heavy metals, such as hexavalent chromium from water. The system comprises at least two reactor containers for independently mixing chemicals with water. The system further comprises a flocculator and a clarifier whereby e... | 03/19/1991 |
| 4999114 | Method of treating spent dryfilm stripping and developing solutions with a chemical mixture A chemical mixture for treating spent dryfilm stripper and developer solutions by mixing the spent solutions with a solution of aluminum sulfate and borax in controlled amounts causing a surface absorption reaction which results in a slurry of a non-stick... | 03/12/1991 |
| 4968436 | Method for the treatment of sewage containing nitrites In a method for the treatment of sewage containing nitrites comprising the reduction of the nitrite with urea in an acid medium it is provided, to obtain end products friendly to the environment and an economic conduction of the method, that a greatly aci... | 11/06/1990 |
| 4940551 | Method for pH control A method for controlling pH of an effluent stream or batch process is provided in which multiple in-process reagent concentration and pH data pairs are used to characterize the titration curve of the influent stream or batch fluid. Reagent is added in two... | 07/10/1990 |
| 4933088 | Method of and apparatus for treating water utilizing proton-releasing substance and/or magnetic field A method of and an apparatus for treating water by providing a water being treated with a crystal water-containing proton-releasing crystalline mineral and/or a magnetic field, while controlling the amount of proton released and the strength of said magne... | 06/12/1990 |
| 4931187 | Cooling tower system A cooling tower system and associated method is disclosed for controlling an aqueous coolant circulated through a cooling tower without requiring discharge of the coolant during recirculation. The coolant pumped from the cooling tower is filtered and moni... | 06/05/1990 |
| 4904389 | Process for the separation of dicarboxylic acids A process for separation of multicomponent mixtures of dicarboxylic acids, especially, mixtures of C8 -C24 saturated and unsaturated acids is derived from a fermentation process, in which an aqueous feed solution containing the mixtu... | 02/27/1990 |
| 4857206 | Method for treating, spent dryfilm stripping and developing solutions A method of treating spent dryfilm stripper and developer solutions by mixing the spent solutions with a solution of aluminum sulfate and borax in controlled amounts causing a reaction which results in a slurry of a non-sticky, benign precipitate in a sup... | 08/15/1989 |
| 4855061 | Method and apparatus for controlling the coagulant dosage for water treatment Apparatus for controlling the coagulant dosage rate includes a charge sensor located adjacent a coagulant pump for measuring the net electrical charge on coagulated water before water treatment and a turbidity meter for measuring the effluent turbidity af... | 08/08/1989 |
| 4839061 | Method and apparatus for treatment of hazardous material spills Spills of hazardous materials are treated at the site of the spill using an integrated spill responder system which enables personnel to remain at a safe distance from the spill. The mobile, fully self-contained system is dispatched to the spill site and ... | 06/13/1989 |
| 4830757 | Telemetry system for water and energy monitoring A water quality monitor computer (10) repeatedly accesses transducers (12) which monitor physical properties of a water system, such as total dissolved solids, pH, and the like. The water quality monitor computer determines from the monitored water condit... | 05/16/1989 |
| 4828717 | Device and method for reducing volume of aqueous waste effluents The device for reducing the volume of an aqueous waste effluent includes a holding tank, a heating tank for receiving waste effluent from the holding tank and including a heater for heating the waste effluent to a predetermined temperature which is below ... | 05/09/1989 |
| 4767511 | Chlorination and pH control system System for automatic control of chlorine content and pH in swimming pools. This system includes an electrolytic cell for generation of chlorine and caustic soda as needed, and an acid supply system for adding hydrochloric acid to the pool as required. Gen... | 08/30/1988 |
| 4764279 | Process for preparing the principal proteins of hemolyzed blood in the non-denatured form The process comprises subjecting the hemolyzed blood to a clarification step at a pH of between 4 and 6 in the presence of less than 15% of alcohol, then, after concentration, effecting a chromatography by exchange of anions so as to separate the hemoglob... | 08/16/1988 |
| 4709664 | Method for determining the existence of phosphate hideout A method for determining the existence of phosphate hideout in a steam generating steam cycle (10) so that the nature of the impact of the phosphate hideout on pH and the PO4 concentration in the boilerwater of the steam generating steam cycle ... | 12/01/1987 |
| 4678586 | Treatment of wash water in paint spray booths To control build-up of paint in the water tank an alkaline liquid containing NaOH is added in quantities to maintain a pH not substantially less than 9, thus preventing corrosion, and a hydroxide ion concentration not exceeding 0.01M. The additive is intr... | 07/07/1987 |
| 4670157 | Process for clarifying bicarbonate bearing water using measurement and control of carbon dioxide content This invention relates to a process for achieving and maintaining the clarity of bicarbonate bearing waters. The process has application to treating bicarbonate bearing waters where such waters are for injection into a subsurface formation, for waste disp... | 06/02/1987 |
| 4435291 | Breakpoint chlorination control system A method and apparatus for breakpoint chlorination is disclosed which utilizes a control dosing of chlorine as well as a base substance and sulfur dioxide to remove ammonia, disinfect and thereafter dechlorinate waste waters. The chlorine dosage is contro... | 03/06/1984 |
| 4427643 | Method and apparatus for generating high pH limewater This invention relates to a method and apparatus for producing high pH water containing dissolved lime by forcing potable water through a column of powdered lime supported on a porous support without transporting significant quantities of lime out of the ... | 01/24/1984 |
| 4427553 | Removal of solids from a cooling tower basin Solids are removed from a cooling tower basin by using a perforated removal header in the basin in conjunction with a back flush flow.... | 01/24/1984 |
| 4405462 | Automatic revitalization of sulfide processing and treatment solutions A system and process has been devised for measuring and constantly maintaining a desired concentration of soluble sulfides in a processing solution for the purpose of fully maintaining its function. Sulfide regenerating solution is automatically introduce... | 09/20/1983 |
| 4382865 | Treatment of reducible halohydrocarbon containing aqueous stream A new, economical system for removal of persistent reducible organic compounds from aqueous streams by passing the stream, preferably at or near neutral pH, into a bottom inlet to a column to provide fluidization of metal reductant catalyzed to provide ef... | 05/10/1983 |
| 4366064 | Treatment of blast furnace wastewater Wastewater, particularly blowdown from a recycle gas-scrubbing and gas-cooling system of a blast furnace, is treated in a two-stage chlorination unit, the first stage including a chlorine addition at a pH of about 8.5 to about 10, preferably 9-9.5, and th... | 12/28/1982 |
| 4323092 | Apparatus and process for detecting free chlorine Apparatus and process are provided for measuring and monitoring the free active chlorine content of an aqueous solution. Regulation of the addition of chlorinating substances to maintain a desired chlorine level in drinking or bathing water is further pro... | 04/06/1982 |
| 4311597 | Method and apparatus for treatment of wastewater A method of removing ammonia from a wastewater containing free and fixed ammonia said process comprising the steps of: distilling the wastewater to remove the free ammonia; treating the distilled wastewater with soda ash to decompose the fixed ammonia; an... | 01/19/1982 |
| 4304599 | Heavy metal removal process A gravity fed water bath process treats waste water from spray rinses containing compounds of copper and like heavy metals. For displacing heavy metals, such as copper, the bath has a substantially pure metal with an electrode potential greater than the h... | 12/08/1981 |
| 4280914 | Process for automatically controlling the detoxification of waste waters containing nitrite ions In the detoxification of waste waters containing nitrite ions by means of hydrogen peroxide the addition of hydrogen peroxide is automatically controllable by adding the hydrogen peroxide continuously or in portions with continuous measurement of the pH a... | 07/28/1981 |
| 4217217 | PH Control system for carbonated beverage plants There is disclosed herein a pH control system for alkaline wastes from carbonated beverage plants and the limitations of an equipment design and method and operation which provide maximum efficiency at minimum cost. These limitations include size and shap... | 08/12/1980 |
| 4126550 | Flash reactor An apparatus for treating, such as by neutralization, oxidation, or flocculation, waste liquid streams. Waste liquid and a treating substance, such as an acid or a base, are introduced through a nozzle into a chamber and then through a second nozzle into ... | 11/21/1978 |
| 4011151 | Process for purifying waste water by electrolysis A process for purifying waste water by electrolysis in two steps is disclosed. In the first step, the electrolysis is effected by dipping an iron anode and a carbon cathode in the waste water having a pH of about 7 to be purified until a pH of 11 is reach... | 03/08/1977 |
