摘要:
The invention concerns a product based on assimilated clinkers derived from household refuse incineration comprising 95 to 99.5 wt. % of a clinker having a particle size not more than 40 mm and a moisture content from 10 to 30 wt. %, and 0.5 to 5 wt. % of coke. The invention is applicable to purification of biogas generated by landfills.
摘要:
Anaerobically decomposed organic materials such as landfill material or sewage sludge are treated by passage of an electric current therethrough in order to enhance production of hydrogen, suppress formation of methane and decrease the time required to process such materials. A process and apparatus for separation of carbon dioxide from other gaseous material produced by decomposition of organic material are also disclosed.
摘要:
The invention relates to a process for removal of sulfur compounds from wastewater, which process provides recovery of elemental sulfur. The process is carried out in two separate anaerobic reactors. In the first reactor organic compounds are converted to acid compounds and sulfur compounds are converted to sulfide compounds. The sulfide compounds are stripped from said first reactor with a stripping gas. Subsequently, the effluent of the first reactor is fed to a second anaerobic reactor, in which organic compounds, such as the acid compounds, are converted to produce biogas, while any unconverted sulfur compounds from the previous step are converted to sulfide compounds as well. Finally, the sulfide compounds are removed from the second reactor in a stripping system, and converted to elemental sulfur in an adsorber.
摘要:
The invention provides a method for transporting waste from one location to another, treating the waste to produce a biogas, and utilizing a portion of that biogas to enhance plant growth and/or as a fuel source. The waste is loaded into a bladder (11) included in a railroad car (50), and the waste is transported to a remote treatment facility for unloading. The waste is then treated by anaerobic digestion to produce the biogas.
摘要:
A process for removing H2S from biogas is provided, wherein the biogas is treated with an alkaline scrubbing liquid, the alkalinity necessary for absorption of H2S originating from an aerobic biological waste water treatment plant. Thus, the water/biomass mixture form the aerobic treatment or the clarified effluent can be used as a scrubbing liquid. The water flow/gas flow ratio in the scrubbing process is preferably 0.2 or greater. The liquid wherein H2S is absorbed can be recycled to the aerobic phase for oxidising the H2S. The process can be performed using a closed column gas scrubber equipped with inlet and outlet for biogas, inlet and outlet for treated waste water and means for contacting biogas and waste water.
摘要:
PCT No. PCT/NL91/00250 Sec. 371 Date May 26, 1993 Sec. 102(e) Date May 26, 1993 PCT Filed Dec. 4, 1991 PCT Pub. No. WO92/10270 PCT Pub. Date Jun. 25, 1992.A process for the removal of sulphur compounds from a gaseous effluent, comprising the steps of: a) contacting the gaseous effluent with an aqueous solution wherein sulphur compounds are dissolved; b) adjusting the concentration of buffering compounds such as carbonate and/or bicarbonate and/or phosphate in the aqueous solution to a value between 20 and 2000 meq/l; c) subjecting the aqueous solution containing sulphide to sulphide-oxidizing bacteria in the presence of oxygen in a reactor wherein sulphide is oxidized to elemental sulphur; d) separating elemental sulphur from the aqueous solution; and e) recycling the aqueous solution to step a). This process is suitable for removing H2S from biogas, ventilation air etc. It can be used for removing SO2 from combustion gases by introducing the additional step, after step a) and before step c), of subjecting the aqueous solution containing the sulphur compounds to a reduction of the sulphur compounds to sulphide. H2S and SO2 removal is further enhanced by a residual sulphur content in the washing liquid of 1-50 g/l.
摘要:
Système économique et pratique permettant de stimuler la croissance des plantes à l'aide d'un apport de dioxyde de carbone gazeux (30). On plante les végétaux dans une tranchée allongée (10) de préférence en les serrant au maximum, ce qui leur permet de pousser suffisamment pour former une voûte fermée. Le gaz riche en dioxyde de carbone (30) peut arriver dans la tranchée par des conduites (32) situées sous le niveau de la voûte. Lesdites tranchées peuvent comporter un fond (12) et des parois latérales (14) qui s'étendent verticalement vers le haut et de manière divergente l'une par rapport à l'autre pour limiter l'écoulement d'air sous la voûte, ce qui a pour effet de minimiser les effets de dilution de l'atmosphère. Les tranchées (10) peuvent également être orientées de manière pratiquement perpendiculaire à la direction du vent dominant afin de minimiser la tendance du vent à emporter le dioxyde de carbone (30).
摘要:
A purification process for waste water and/or waste water sludge, comprising a methane fermentation and subsequent oxidation of the reduced compounds present in the effluent of the methane fermentation by means of aeration, whereby the sulphide from the effluent of the methane fermentation is used as electron donor by the denitrification and whereby the residual reduced compounds from the liquid effluent from the methane fermentation not until the subsequent next step are oxidized by aeration. In this way the sulphides, produced by the methane fermentation, are used in appropriate way and simultaneously converted in non troublesome or innocent sulphate. In the liquid effluent, remaining after denitrification, the ammonia, which was occurring in the effluent is still present; this ammonia is subsequently oxidized into nitrate at the aeration, whereby the sulphide cannot interfere with, as this sulphide was converted in sulphate with the denitrification. As no sulphide is more present, the aeration is demanding less air and aeration may moreover be more simple. The hydrogen sulphide from the gas formed by the methane fermentation also may be used for this purpose, giving in this way the greatest utility of the products formed with the methane fermentation, while the gas is purified in a simple way.