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Process for dewatering sludges
Environment International, Vol. 10, pp. i- iv, 1984
0160-4120/84 $3.00 + .00 Copyright © 1985 Pergamon Press Ltd.
Printed in the USA. All rights reserved.
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH ®online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH ® can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
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STEPPED HEARTH I N C I N E R A T O R WITH POSITIVE C L E A N - O U T OF AIR F E E D - T U B E S John S Somodi assigned to Enercon Systems Incorporated
An inclined hearth incinerator for the incineration of municipal, and industrial/commercial solid waste optionally in conjunction with sludge, with a controlled amount of combustion air allows the even distribution of underfire air to an upper hearth of plural stepped hearths in the floor of the incinerator. A clean-out assembly includes a piston which automatically cleans out feed-tubes for combustion air. The feed-tubes are protected by being embedded in the hearth, or being disposed beneath the hearth. The piston and a ram on the hearth may be interconnected for reciprocation by an actuating means so as to provide synchronous to-and-fro movement of the piston and ram.
4479857 M E T H O D AND APPARATUS FOR RADON CONTROL Hugh M Barton assigned to Phillips Petroleum Company
A method of reducing the emanation of radon gas from radium in mine rock faces. Also disclosed is apparatus employing an anode in electrical contact with the mine rock face in a waterbearing formation and a cathode remote therefrom in the water-bearing formation, as well as a source of D-C voltage for applying a potential between the cathode and the anode for moving radium ions toward the cathode through the water-bearing formation from the mine rock face by electrolysis.
~7~79 PROCESS FOR DEWATERING SLUDGES Masanori Hashimoto, Masaaki Wakita, Yamato, Japan assigned to Kurita Water Industries Ltd A process for dewatering aqueous sludges of organic nature by adding to the sludge a cationic organic flocculant to effect a first stage agitation of vigorous intensity, and then adding thereto an anionic organic flocculant to perform a second stage agitation of mild intensity and subjecting the thus formed flocs to a dewatering operation, which process comprises the use of a cationic organic flocculant composed of any combination
New Patents
of A- and B-components, wherein the Acomponent consists of one or more polymers selected from the group consisting of AI- and A2-components, in which the Al-component consists of polymers having a structural unit of vinylimidazoline or partially hydrolyzed products thereof and the A2-component consists of Hofmann-degradation products of polymers having a structural unit of acrylamide or methacrylamide, and the B-component consists of one or more polymers selected from the group consisting of synthetic water-soluble cationic polymers other than the polymers of the Acomponent.
4479928 CATALYTIC PROCESS FOR THE PRODUCTION OF SULPHUR FROM A GAS CONTAINING H2S Robert Voirin, Orthez, France assigned to Societe Nationale Elf Aquitaine (Production) Catalytic process for the production of sulphur from an acid gas containing H2S, in which a part of H2S is catalytically oxidized in order to form an effluent containing H2S and SO2 in a molar ratio of 2:1 and a given quantity of sulphur. The effluent is then contacted with a CLAUS catalyst to form a further quantity of sulphur. Said process involves: an oxidation reactor with a fixed bed an indirect gas/gas heat exchanger deoxygenation reactor having a fixed bed a catalyst conversion battery a thermal incinerator.
plate features a monolithic plate of granular filter material used as the filtering medium in sludge beds for dewatering or reducing residual solids or sludge of potable water treatment systems. The filter material is made structurally rugged and with a smooth hard surface for the retention of sludge solids. The filter material is supported upon a substructure of aggregate providing approximately 40% internal voids for the gravity flow or drainage of filtrate and the back flow of chemicals and gases used in the rapid water reduction process. The assemblage is constructed of such strength as to allow for use of heavy handling equipment such as front end loaders in the removal of the dried sludge or cake upon the completion of the rapid water reduction process. The process follows a cyclical pattern on adjacent sludge beds where raw sewage is pretreated with a polymer coagulant to break up solids to flocculate the sludge particles and spread on the filter bed as the filter bed is being filled. Large coagulated sludge particles gain weight as they settle and water is drawn off by gravity while a bed is being filled to the desired designed level. Smaller sludge particles pass to the voids below by a vacuum of 10 to 15 inches when the vacuum is applied, to start the rapid dewatering process through the larger flocculated sludge particles and the mass may be periodically moved and heated while dewatering progresses. Upon completion ofdewatering, one or more units of front end loading equipment is used to move the dried sludge cake into heaps and load it into trucks for transport to disposal sites.
4481115 4481114 SLUDGE DEWATERING SYSTEM Morris M Riise assigned to International Sludge Reduction Company
A system for the rapid dewatering of sludge in large quantities makes use of a filter plate of design and construction capable of supporting heavy mechanized mobile equipment and without damage to the filter media. The filter
FILTRATION OF SEWAGE SLUDGE David Wade, Graham Dawson, Bradford, United Kingdom assigned to Allied Colloids Limited An organic suspension, such as sewage sludge, is conditioned by adding a conditioner and then filtering the suspension through a filter element to form a filter cake on the element. Improved dryness properties of the cake are obtained by using as conditioner during the formation of at least the first half (by weight solids), but not all, of the cake a high molecular weight polyelectrolyte conditioner and by using as conditioner during the formation of the remainder of the cake an inorganic conditioner or a low molecular weight polyelectrolyte conditioner.
0160-4120/84 $3.00 + .00 Copyright © 1985 Pergamon Press Ltd.
Printed in the USA. All rights reserved.
NEW PATENTS This Section contains abstracts and, where appropriate, illustrations of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH ®online database in accordance with interest profiles developed by the Editors. Further information about Pergamon PATSEARCH ® can be obtained from Pergamon InfoLine Inc., 1340 Old Chain Bridge Road, McLean, Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
~79~1
,~ ....
7 .....
STEPPED HEARTH I N C I N E R A T O R WITH POSITIVE C L E A N - O U T OF AIR F E E D - T U B E S John S Somodi assigned to Enercon Systems Incorporated
An inclined hearth incinerator for the incineration of municipal, and industrial/commercial solid waste optionally in conjunction with sludge, with a controlled amount of combustion air allows the even distribution of underfire air to an upper hearth of plural stepped hearths in the floor of the incinerator. A clean-out assembly includes a piston which automatically cleans out feed-tubes for combustion air. The feed-tubes are protected by being embedded in the hearth, or being disposed beneath the hearth. The piston and a ram on the hearth may be interconnected for reciprocation by an actuating means so as to provide synchronous to-and-fro movement of the piston and ram.
4479857 M E T H O D AND APPARATUS FOR RADON CONTROL Hugh M Barton assigned to Phillips Petroleum Company
A method of reducing the emanation of radon gas from radium in mine rock faces. Also disclosed is apparatus employing an anode in electrical contact with the mine rock face in a waterbearing formation and a cathode remote therefrom in the water-bearing formation, as well as a source of D-C voltage for applying a potential between the cathode and the anode for moving radium ions toward the cathode through the water-bearing formation from the mine rock face by electrolysis.
~7~79 PROCESS FOR DEWATERING SLUDGES Masanori Hashimoto, Masaaki Wakita, Yamato, Japan assigned to Kurita Water Industries Ltd A process for dewatering aqueous sludges of organic nature by adding to the sludge a cationic organic flocculant to effect a first stage agitation of vigorous intensity, and then adding thereto an anionic organic flocculant to perform a second stage agitation of mild intensity and subjecting the thus formed flocs to a dewatering operation, which process comprises the use of a cationic organic flocculant composed of any combination
New Patents
of A- and B-components, wherein the Acomponent consists of one or more polymers selected from the group consisting of AI- and A2-components, in which the Al-component consists of polymers having a structural unit of vinylimidazoline or partially hydrolyzed products thereof and the A2-component consists of Hofmann-degradation products of polymers having a structural unit of acrylamide or methacrylamide, and the B-component consists of one or more polymers selected from the group consisting of synthetic water-soluble cationic polymers other than the polymers of the Acomponent.
4479928 CATALYTIC PROCESS FOR THE PRODUCTION OF SULPHUR FROM A GAS CONTAINING H2S Robert Voirin, Orthez, France assigned to Societe Nationale Elf Aquitaine (Production) Catalytic process for the production of sulphur from an acid gas containing H2S, in which a part of H2S is catalytically oxidized in order to form an effluent containing H2S and SO2 in a molar ratio of 2:1 and a given quantity of sulphur. The effluent is then contacted with a CLAUS catalyst to form a further quantity of sulphur. Said process involves: an oxidation reactor with a fixed bed an indirect gas/gas heat exchanger deoxygenation reactor having a fixed bed a catalyst conversion battery a thermal incinerator.
plate features a monolithic plate of granular filter material used as the filtering medium in sludge beds for dewatering or reducing residual solids or sludge of potable water treatment systems. The filter material is made structurally rugged and with a smooth hard surface for the retention of sludge solids. The filter material is supported upon a substructure of aggregate providing approximately 40% internal voids for the gravity flow or drainage of filtrate and the back flow of chemicals and gases used in the rapid water reduction process. The assemblage is constructed of such strength as to allow for use of heavy handling equipment such as front end loaders in the removal of the dried sludge or cake upon the completion of the rapid water reduction process. The process follows a cyclical pattern on adjacent sludge beds where raw sewage is pretreated with a polymer coagulant to break up solids to flocculate the sludge particles and spread on the filter bed as the filter bed is being filled. Large coagulated sludge particles gain weight as they settle and water is drawn off by gravity while a bed is being filled to the desired designed level. Smaller sludge particles pass to the voids below by a vacuum of 10 to 15 inches when the vacuum is applied, to start the rapid dewatering process through the larger flocculated sludge particles and the mass may be periodically moved and heated while dewatering progresses. Upon completion ofdewatering, one or more units of front end loading equipment is used to move the dried sludge cake into heaps and load it into trucks for transport to disposal sites.
4481115 4481114 SLUDGE DEWATERING SYSTEM Morris M Riise assigned to International Sludge Reduction Company
A system for the rapid dewatering of sludge in large quantities makes use of a filter plate of design and construction capable of supporting heavy mechanized mobile equipment and without damage to the filter media. The filter
FILTRATION OF SEWAGE SLUDGE David Wade, Graham Dawson, Bradford, United Kingdom assigned to Allied Colloids Limited An organic suspension, such as sewage sludge, is conditioned by adding a conditioner and then filtering the suspension through a filter element to form a filter cake on the element. Improved dryness properties of the cake are obtained by using as conditioner during the formation of at least the first half (by weight solids), but not all, of the cake a high molecular weight polyelectrolyte conditioner and by using as conditioner during the formation of the remainder of the cake an inorganic conditioner or a low molecular weight polyelectrolyte conditioner.