| Patents for C02F 9 - Multistep treatment of water, waste water or sewage (41,429) |
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| 07/07/1981 | US4277346 Adsorption by solid solution of calcium compound and aluminum oxide or hydroxide |
| 07/07/1981 | US4277343 Method for continuously monitoring and controlling alkalinity for environmental purposes using a pCO2 probe |
| 06/30/1981 | US4276269 Precipitation of ferric silicate from zinc sulfate solution |
| 06/30/1981 | US4276177 High efficiency filtration with impurity concentration and ultrafiltration rejection flow recirculation |
| 06/24/1981 | EP0030559A1 Improved aqueous soap-based lubricant composition. |
| 06/23/1981 | US4274973 Neodecanoic acid |
| 06/23/1981 | US4274969 Process for treating waste water from propylene oxidation plants |
| 06/23/1981 | US4274968 Process for the purification of water |
| 05/19/1981 | CA1101599A1 Process for separating polyvinyl alcohol from its solution |
| 05/12/1981 | US4267130 Portable auxiliary cooling tower |
| 05/12/1981 | US4267049 Comprising hydrolysis by enzymes and enzyme-producing microorganisms |
| 05/12/1981 | US4267038 Harvesting algae from wastewater treatment process |
| 05/05/1981 | US4265863 Integrated process for treatment of residual solutions from anodization plants |
| 05/05/1981 | US4265712 Water purification system |
| 04/22/1981 | EP0027278A1 Combined iodine-ultraviolet water desinfection process |
| 04/14/1981 | US4261821 Apparatus for treating water with a chemical |
| 04/07/1981 | US4260494 Removal of mercury sulfides by oxidation |
| 04/07/1981 | US4260493 Removal of copper and nickel, reduction, deactivating complexes |
| 04/07/1981 | US4260491 Reduction, chelation, precipitation |
| 04/07/1981 | US4260487 Zeolite for oxidizing and precipitating iron, manganese and hydrogen sulfide; potassium permanganate; brine |
| 03/31/1981 | US4259149 Chromatography of effluents from chlorination, oxidation, and caustic extraction |
| 03/24/1981 | US4257899 Method for removing chloropicrin from an aqueous medium |
| 03/17/1981 | US4256577 Treatment with a base and then with amorphous magnesium silicate to form a complex |
| 03/03/1981 | CA1096980A1 Apparatus for treating fluids |
| 02/17/1981 | US4251367 Wastewater treatment |
| 02/10/1981 | US4250040 Gravity filtration, intermittent ozonization and periodic backwashing |
| 02/10/1981 | US4250030 Process for the removal of cyanides from effluent |
| 02/04/1981 | EP0023444A1 Portable water purifier for domestic use |
| 02/03/1981 | US4248710 Apparatus for the purification of water possessing solvent waste content |
| 01/28/1981 | EP0022770A1 Treatment of sea discharged sewage |
| 01/27/1981 | US4247395 Sewage treatment process and apparatus |
| 01/27/1981 | US4246665 Non-polluting toilet system |
| 01/27/1981 | CA1094700A1 Water recycling system |
| 01/20/1981 | US4246417 Treatment of waste water from nitrile production |
| 01/20/1981 | US4246101 Water recycling system |
| 01/13/1981 | US4244804 Slime and sludge dewatering |
| 01/08/1981 | WO1981000014A1 Improved aqueous soap-based lubricant composition |
| 12/30/1980 | CA1092360A1 Process for recovery of selected metal values from waste waters |
| 12/23/1980 | US4241227 Solvent extraction of phenols, tar bases, volatiles |
| 12/23/1980 | US4240909 Nonionic amine-borane or phosphine-borane adducts |
| 12/16/1980 | US4239620 Cyanide removal from wastewaters |
| 12/02/1980 | US4237004 Treatment with a coagulant and a disinfectant |
| 12/02/1980 | US4237002 Absorption on activated carbon of impurities in waste liquid which inhibit its biological treatment |
| 12/02/1980 | US4236973 Method of removing contaminants from water |
| 11/25/1980 | US4235677 Distillation flask and apparatus for producing high-purity water having overflow liquid trap means |
| 11/18/1980 | US4234425 Fluoridation system |
| 11/18/1980 | US4234422 Process for removal of mercury and mercury compounds from aqueous solutions and industrial waste liquors |
| 11/18/1980 | US4234419 Process for the removal of inorganic salts from a water stream |
| 11/11/1980 | US4233406 Process for the enzymatic treatment of waste water of wheat starch plants |
| 11/11/1980 | CA1089573A1 Method for treating waste water containing cyanide ion |
| 10/28/1980 | US4230577 Tank for cleaning and chemical treatment of boiler feedwater |
| 10/28/1980 | US4230567 Process for working up effluents containing nitro-hydroxy-aromatic compounds |
| 10/21/1980 | CA1088231A1 Process for purifying waste water containing phenol and phenol formaldehyde |
| 10/15/1980 | EP0017274A1 Process and apparatus for the treatment of manure |
| 10/14/1980 | US4228006 Domestic water system |
| 10/14/1980 | US4228000 Water treatment apparatus with means for automatic disinfection thereof |
| 10/07/1980 | US4226718 Coagulation |
| 09/30/1980 | US4225431 Process and apparatus for the treatment of aqueous waste materials |
| 09/30/1980 | US4224821 Apparatus and method for sensing the quality of dewatered sludge |
| 09/23/1980 | US4224148 Galvanic flow system for joint particulate recovery and liquid purification |
| 09/23/1980 | CA1086436A1 Process for elimination of mercury from industrial waste waters by means of extraction with solvents |
| 09/18/1980 | WO1980001922A1 Process for treating manures |
| 09/16/1980 | US4222872 Reclamation of molybdenum or other heavy metals from wastewater treatment skimmings |
| 09/16/1980 | CA1085979A1 Chemical waste water treatment method |
| 09/09/1980 | US4221766 Minimizing soluble iron concentration in a plant effluent |
| 09/09/1980 | US4221659 Process for reducing dichlorobutene contamination in aqueous plant wastes |
| 09/09/1980 | US4221634 Method of treating papermaking white water |
| 09/04/1980 | WO1980001800A1 Method for eliminating aromatic amines from waste water |
| 09/03/1980 | EP0015152A1 A method for removing multivalent heavy metal ions from a metal plating waste effluent |
| 09/03/1980 | EP0014884A1 Process for working up waste water containing ammonium sulfate |
| 08/26/1980 | US4219419 Treatment of reducible hydrocarbon containing aqueous stream |
| 08/26/1980 | US4219418 Oxidation, flocculation, sedimentation, chlorination |
| 08/26/1980 | US4219415 Method and apparatus for disposal of organic wastes |
| 08/20/1980 | EP0014276A1 Integrated sewage treatment system |
| 08/19/1980 | US4218315 Water pollution control |
| 08/12/1980 | US4217217 Neutralization, water pollution |
| 08/05/1980 | US4216088 Method of treating phenolic waters formed in the manufacture of phenol-formaldehyde resins |
| 08/05/1980 | US4216057 Purifying plant for water to be vaporized in a steam generator of a nuclear reactor |
| 08/05/1980 | CA1082857A1 Treatment of effluents in a chlorine based pulp bleaching plant |
| 07/29/1980 | US4214887 Sewage and waste water treatment |
| 07/23/1980 | EP0013445A1 Hand-driven raw water extraction and treatment device |
| 07/22/1980 | US4213820 Separating eluate from anion exchange resin bed into fractions by color pattern |
| 07/15/1980 | US4212732 Raw liquid waste treatment process |
| 07/15/1980 | US4212724 Oxidation and coagulation for aquarium applications |
| 07/09/1980 | EP0013050A2 Process for the removal of volatile ionisable components from aqueous streams |
| 07/08/1980 | US4211652 Water reclamation process |
| 07/08/1980 | US4211651 Water reclamation process |
| 07/08/1980 | US4211650 Water reclamation process |
| 07/08/1980 | US4211649 Circulation through rotating housing containing granular absorber |
| 07/08/1980 | US4211646 Waste water process |
| 07/01/1980 | US4210530 Treatment of metal plating wastes with an unexpanded vermiculite cation exchange column |
| 06/25/1980 | EP0012162A1 A method for the treatment of reducible hydrocarbon-containing aqueous streams |
| 06/24/1980 | US4209396 Methods for use in water purification particularly sewage treatment |
| 06/24/1980 | US4209389 Sewage treatment with kefir milk acid bacteria |
| 06/17/1980 | US4208283 Treatment with lime, chlorination |
| 06/17/1980 | US4208282 Process for the purification of sewage while recapturing the fatty and albuminous matter in reusable form |
| 06/17/1980 | US4208245 Pretreating black liquor with sodium bisulfite produced by combusting by-product noncondensibles and treating with sodium carbonate |
| 06/10/1980 | CA1079423A1 Process for treatment waste waters |
| 05/27/1980 | US4205147 Acidification and heat to dissolve copolymer containing carboxylic or sulfonic acid moieties |
| 05/27/1980 | US4204973 Barium chromate |