摘要:
A method of removing hydrogen sulphide from a gas stream wherein the hydrogen sulphide is scrubbed from the gas phase by an aqueous solution, the hydrogen sulphide in the aqueous solution is biologically oxidized in a bioreactor to produce elemental sulphur, and the elemental sulphur is separated from the aqueous solution, characterized in that the gas stream to be treated is cooled to such a degree that at least sufficient water vapour condenses from the gas stream to compensate for the discharge stream for the purpose of removing salts. This means that no water need be supplied to the bioreactor. This method is suitable, in particular, for gas streams which contain hydrogen sulphide, the hydrogen sulphide having been obtained by catalytic conversion of sulphur compounds.
摘要:
A first embodiment is disclosed, relating to a device including an anode and a cathode. The anode and cathode are placed in a separate anode and cathode compartment. In at least one embodiment of the device, electron transfer takes place from the cathode to a terminal electron acceptor via a redox mediator. In at least one embodiment, the redox mediator includes the Fe (II)/Fe (III) redox couple. According to a further aspect, of at least one embodiment of the invention, relates to a method for generating electric energy with use of the device according to at least one embodiment of the invention.
摘要:
A process and a device for purifying flue gas containing nitrogen oxides, in which the flue gas is scrubbed with a circulating scrubbing liquid which contains a transition metal chelate such as Fe (II) EDTA and the complex formed from nitrogen oxide and transition metal chelate and/or spent transition metal chelate is regenerated biologically in the presence of an electron donor, nitrogen oxide being reduced to molecular nitrogen. The biological reactor can be combined with the gas scrubber. The electron donor is, for example, hydrogen or methanol, but may also be sulphite which originates from sulphur dioxide in the flue gas.
摘要:
The invention relates to a device comprising a reactor, where the reactor comprises an anode compartment and a cathode compartment, and where the anode compartment comprises a) an anodophilic micro-organism capable of oxidizing an electron donor compound, and b) a living plant or part thereof. The invention also relates to a method for converting light energy into electrical energy and/or hydrogen, where a feedstock comprising an electron donor compound is introduced into the device.
摘要:
A process is provided for the production of hydrogen sulphide from the bacterial reduction of a mixture of a liquid and elemental sulfur with an electron donor, such as hydrogen gas, carbon monoxide or organic compounds. The bacteria may be Desulforomonas sp. (mesophilic), Desulfotomaculum KT7 (thermophilic), etc. The liquid/sulfur mixture is at a pH ranging from 5 to 9, and the liquid/sulfur mixture contacts the bacteria at a hydraulic retention time of at least 1 day. The hydrogen sulphide is stripped from the liquid medium to produce a gas containing at least 1 volume percent hydrogen sulphide.
摘要:
A process for the treatment of waste water containing heavy metals in which sulphur components and/or metals are biologically reduced to precipitate the metals as water-insoluble metal species, which are separated from the waste water. The biological reduction and the precipitation of the metal species are carried out in a moving sand bed, in which sand particles partly immobilize the bacteria and retain the precipitated metal species, treated waste water is separated from the precipitated metal species and the precipitated metal species are subsequently separated from the sand particles. Metals like selenium and uranium can be precipitated without sulphur components, whereas metals like antimony, cadmium, copper, zinc and the like are precipitated as sulphides.
摘要:
The invention provides a process for removing polyamine chelating agents from aqueous solutions comprising oxidising the chelating agents with oxygen in the presence of an equivalent amount of a transition metal such as iron, followed by biologically reducing the chelates in the presence of an electron donor, and optionally by membrane filtration. The biological reduction is carried out with denitrifying and/or sulphate-reducing bacteria.
摘要:
A device includes a first electrode compartment, the anode compartment, and a second electrode compartment, the cathode compartment, with a quantity of an anode fluid including an electrochemically oxidizable substrate and optional further compounds in the anode compartment, a quantity of a cathode fluid including an electrochemically reducible substrate and optional further compounds in the cathode compartment, and further an anode at least partially in contact with the anode fluid in the anode compartment and a cathode at least partially in contact with the cathode fluid in the cathode compartment. In at least one embodiment, the anode and cathode are electrically connected and on the surface of the anode and the cathode a catalyst is present for respective catalysis of the electrochemical conversion of the electrochemically oxidizable substrate via an electrochemical oxidation reaction and for catalysis of the electrochemical conversion of the electrochemically reducible substrate via an electrochemical reduction reaction, the catalyst including electrochemically active micro-organisms on at least one of the anode or cathode.
摘要:
The invention relates to a method for the enzymatic production of C6-C18 fatty alcohol and/or C8-C18 fatty acid, by carbon chain elongation, comprising the steps of: i) providing organic C2-C6 compounds; ii) subjecting the organic C2-C6 compounds to enzymatic carbon chain elongation in the presence of an electron donor; and iii) separating the formed C6-C18 fatty alcohol and/or C8-C18 fatty acid.
摘要:
A process for producing hydrogen from bio-oxidisable material is disclosed herein. The process comprises the steps of—introducing the bio-oxidisable material into a reactor provided with an anode and a cathode optionally separated by a cation exchange membrane and containing anodophilic bacteria in an aqueous medium;—applying a potential between the anode and cathode 0.05 and 1.5 volt, while maintaining a pH of between 3 and 9 in the aqueous medium; —collecting hydrogen gas at the cathode. The hydrogen production process can be intermittently switched to an electric power generation stage (biofuel cell) by adding oxygen to the cathode and separating the anode and cathode spaces by means of a cation exchange membrane.