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| Number | Title | Issue Date |
| 4163716 | Process for the purification of contaminated water The invention concerns a process for the purification of acid dyehouse effluent from a dyeing process, which is contaminated with coloured substances and heavy metal ions. After removal of fibers, the effluent is subjected to ion exchange to remove surfac... | 08/07/1979 |
| 4160594 | Method and arrangement for the development of latent images particularly latent photographic images An arrangement for developing latent images includes a mechanism for conveying an article which carries a latent image over a succession of containers which accommodate a developer, a washing fluid, a fixer and a washing fluid respectively. A pressure cha... | 07/10/1979 |
| 4159944 | Wastewater energy recycling method An auxiliary process and method for use in wastewater treatment plants, modifying conventional primary and secondary treatment, to condition the effluent for use as agricultural irrigation water containing liquified fertilizer and soil amendment materials... | 07/03/1979 |
| 4142912 | Landfill material A method for treating arsenic-containing waste materials for disposal in landfill sites comprises admixing an arsenic waste, Portland cement, sand, one or more water-soluble manganese or alkaline earth metal salts, and water, thereby producing a slurry si... | 03/06/1979 |
| 4124405 | Process for solidifying aqueous wastes and products thereof The water-soluble pollutants contained in aqueous industrial, agricultural and domestic waste materials are converted into a water-insoluble solid mass with improved resistance to leaching of the pollutants therefrom by treatment with a particulate metall... | 11/07/1978 |
| 4124504 | Process for treating caustic wash solutions A process is disclosed for treating caustic wash solutions with permanganate ions such that a significant degree of chemical purification of the wash solutions is effected which correspondingly permits reuse of the wash solutions in cleaning metal article... | 11/07/1978 |
| 4113504 | Disposal of heavy metal containing sludge wastes The heavy metal content of sludge waste is fixed in a cementitious solid product by mixing the waste sludge with fixing ingredients comprising vermiculite and cement.... | 09/12/1978 |
| 4102784 | Colloid free precipitation of heavy metal sulfides In an aqueous solution heavy metal pollutant ions are removed as a precipitate formed by adding an insoluble slurry of a metal sulfide salt. The supernatant liquid is free of colloids.... | 07/25/1978 |
| 4096064 | System for removal of toxic heavy metals from drinking water Toxic heavy metal ions are removed from water by electrochemical replacement as the water flows through a tandem bed of (a) activated zinc and then (b) magnesium alloyed with a minor amount of manganese to inhibit corrosion. The zinc is activated by conta... | 06/20/1978 |
| 4079067 | Method for recovering metal ions in aqueous liquid Esters of comenic acid were found to form metal chelate compounds with various metal ions and these chelate compounds are soluble in organic solvents. This finding makes it possible to recover or remove metal ions from industrial drainage and the like.... | 03/14/1978 |
| 4076618 | Treatment of liquids containing complexed heavy metals and complexing agents Methods are provided for separating by-products from alkanolamine complexing agents and heavy metals complexed with alkanolamines, and for the waste-treating of solutions containing such complexed heavy metals and complexing agents. Illustratively, the pH... | 02/28/1978 |
| 4072605 | Method of obtaining a precipitate of metallic ions from solutions containing low concentrations of metal salts A method and process for removal by precipitation of salts of a variety of metallic elements from aqueous solutions, including for example, copper, cadmium, chromium, zinc, nickel, lead, tin, platinum, rhodium and others with each of the metallic elements... | 02/07/1978 |
| 4071450 | Precipitation of iron related color bodies Clarification of iron waste waters using basic dyes such as methylene blue, methyl violet or malachite green and the like, alone or in combination with organic or inorganic additives.... | 01/31/1978 |
| 4054516 | Method for selectively capturing metal ions A method for selectively capturing metal ions by treating a solution conting ions of heavy metals, such as cupric ions, zinc ions, etc., at an adjusted pH value with a metal capturing agent comprising a condensation product of a higher fatty acid or deri... | 10/18/1977 |
| 4053401 | Sludge treating process When a bituminous emulsion is added to a water-containing sludge, the sludge is instantaneously separated into an aqueous layer and a solid layer. But, heavy metals other poisonous pollutants cannot be removed from the separated aqueous layer. In contrast... | 10/11/1977 |
| 4049552 | Ozone generating system A housing has an interior casing receiving a coolant. This casing is associated with a forced cooling system and has open ended tubular portions therethrough formed of electrically conducting metal. Glass ozone generating tubes are removably supported in ... | 09/20/1977 |
| 4048283 | Removal of heavy metals from aqueous solutions Aqueous process streams or waste waters destined for merging with public waters sometimes contain deleterious amounts of heavy metals, e.g., lead (Pb) compounds. The heavy metal compounds may be substantially removed or reduced to harmless levels by treat... | 09/13/1977 |
| 4043936 | Biological denitrification of high concentration nitrate waste Biological denitrification of nitrate solutions at concentrations of greater than one kilogram nitrate per cubic meter is accomplished anaerobically in an upflow column having as a packing material a support for denitrifying bacteria.... | 08/23/1977 |
| 4039445 | Matrix of algae and method of making same and method of obtaining uranium from sea water by said matrix A matrix of algae mutants and method of obtaining thereby uranium from sea water, according to which a matrix is prepared of uranium compatible algae mutants suitable for picking up uranium dissolved in sea water, which matrix is then placed in an area of... | 08/02/1977 |
| 4038160 | Method of regenerating a chromium electroplating bath Trivalent chromium electroplating baths which have developed characteristic faults due to accumulation of trace metal contaminants are treated with just sufficient of a water soluble ferrocyanide to restore the bath to normal working order.... | 07/26/1977 |
| 4025430 | Removal of metal ions from waste water A method is provided for treating industrial waste water, such as aqueous effluents obtained in the hydrometallurgy of zinc to remove metal ion impurities therefrom, the method comprising, neutralizing the waste water with slaked lime to provide a final p... | 05/24/1977 |
| 4010186 | Removal of lead from aqueous solution using metallic magnesium A process is described for reducing the lead content of aqueous solution containing lead impurities in which the solution is contacted with metallic magnesium. Lead compounds are converted to water insoluble forms which are separated by recourse to physic... | 03/01/1977 |
| 4005011 | Method for treating effluent resulting from the manufacture of synthetic dyestuffs and related intermediate chemicals A method and apparatus for treating effluent resulting from the manufacture of synthetic dyestuffs and related intermediate chemicals is provided. The effluent is subjected to equalization, chemical treatment, clarification to remove solids, further equal... | 01/25/1977 |
| 4005009 | Method of treating waste water containing surfactant and heavy metals A method of treating a waste water containing anionic surfactant and heavy metals, which comprises the steps of: adding a specific inorganic coagulant and a specific salt to said waste water so as to make the respective concentration of said inorganic coa... | 01/25/1977 |
| 3992294 | Process for sequestering metal ions A process is disclosed for sequestering metal ions by treating said ions with a compound of the formula: ##EQU1## wherein R' is selected from the group consisting of -OH, alkyloxy and aryloxy; and R is selected from the group consisting of... | 11/16/1976 |
| 3985648 | Method and system for purifying liquid A method and system combining filtration and ion-exchange structures for removing contaminants from liquids. In overall concept, contaminated liquid is passed through filtering mediums to remove particulate matter from the incoming contaminated liquid. Or... | 10/12/1976 |
| 3970553 | Heavy metal adsorbent process A process for removing heavy metal ions from aqueous solutions with an adbent comprising granules of a mixture of nitrohumic acid and at least one binder selected from the group consisting of a carboxyl group-containing polymeric compound and a water-ins... | 07/20/1976 |
| 3960723 | Magnetization of iron chromium system The present invention relates to a process for treating aqueous waste solutions containing complexing or oxidizing agents and dissolved metallic elements or compounds of copper, chromium, nickel, lead or tin. The waste solution is treated with finely divi... | 06/01/1976 |
| 3951649 | Process for the recovery of copper Metallic copper is recovered from raw materials containing copper in a chemically bound state by first leaching the copper-containing raw material with a ferric chloride solution to extract copper as copper chloride in aqueous solution. The copper is extr... | 04/20/1976 |
| 3947354 | Removal of heavy metal ions from wastewater Concentrations of undesirable heavy metals in industrial wastewater are reduced to below or very close to the most stringent aqueous discharge limits. This is accomplished by forming an insoluble metal-polyelectrolyte complex which can be easily and econo... | 03/30/1976 |
| 3947284 | Method for solidifying sludge A sludge having a water/solid high ratio and containing a substance having a harmful influence upon the setting of portland cement is solidified by mixing the sludge with hydraulic portland cement and at least one substance selected from the group consist... | 03/30/1976 |
| 3931007 | Method of extracting heavy metals from industrial waste waters A method is provided for extracting metal impurities from waste water to which ferrous ions are added to provide at least two times the amount of ferrous ions on the mol basis to the amount of metal ions present, the resulting solution containing acid rad... | 01/06/1976 |
