A method and plant for the treatment of an organic waste material in liquid form, e.g. liquid manure from livestock, the method comprising filtering fibres and particles from the liquid, subjecting the liquid to anaerobic fermentation in a biogas reactor, separating a substantially sterile and particle-free permeate stream from the biogas reactor, e.g. using ultrafiltration, subjecting the permeate stream to treatment with an ammonia stripper at an elevated temperature and preferably at reduced pressure to remove substantially all ammonia and carbon dioxide and to result in an ammonia fraction and a nutrient salt fraction, and separating the nutrient salt fraction into a fertiliser concentrate fraction and a water fraction, e.g. using reverse osmosis. The end products of the method are clean water, ammonia concentrate, fertiliser concentrate containing salts of P and K, compost and high-quality biogas with a high methane content.

Method and plant for the treatment of liquid organic waste

The invention provides a process for the production of charcoal, fuel gas, and potassium from a biomass gassifier.

Method of production of charcoal, conditioned fuel gas and potassium from biomass

PROBLEM TO BE SOLVED: To obtain high-quality treated water containing a small amount of residual nitrogen from raw water containing ammonia nitrogen and nitrite nitrogen by denitrifying nitrate nitrogen generated in an ANAMMOX denitrification tank by heterotrophic denitrification microorganisms while maintaining activities of ANAMMOX (autotrophic denitrification) microorganisms without requiring strict chemical dosing control and condition control for biological denitrification carried out by the ANAMMOX microorganisms performing a denitrification reaction where ammonia nitrogen acts as an electron donor and nitrite nitrogen acts as an electron acceptor. SOLUTION: In a biological denitrification method, slowly decomposable organic substances are added into the denitrification tank 1, and the nitrate nitrogen generated as a by-product is denitrified by the heterotrophic denitrification microorganisms. COPYRIGHT: (C)2005,JPO&NCIPI

Biological denitrification method

The invention relates to suitable candidate ADH enzymes for production of lower alkyl alcohols including isobutanol. The invention also relates to recombinant host cells that comprise such ADH enzymes and methods for producing lower alkyl alcohols in the same.

Alcohol dehydrogenases (adh) useful for fermentive production of lower alkyl alcohols

(57) [Summary] [PROBLEMS] After contacting raw water containing ammonia nitrogen with ammonia-oxidizing bacteria under aerobic conditions and nitrifying at least a part of the ammonia nitrogen in the raw water to nitrite nitrogen, In a biological nitrogen removal method in which a nitrification liquid is subjected to biological denitrification by the action of a denitrifying bacterium using ammonia nitrogen as an electron donor and nitrite nitrogen as an electron acceptor. Prevents the retention of nitrogen and stably obtains a high nitrogen removal rate. SOLUTION: The ammonia nitrogen concentration in the treated water in the denitrification step is measured, and based on the measured value, the concentration of ammonia in the nitrification step is determined. Adjust the H, DO concentration, liquid temperature, inflow raw water amount or inflow nitrification liquid amount in the denitrification step, or add nitrite nitrogen to the nitrification step or the denitrification step, so that the Maintain nitrogen rate limiting conditions.

Method for biologically removing nitrogen

PROBLEM TO BE SOLVED: To provide the subject method and arrangement intended for biologically and physicochemically treating wastewater containing both ammonia and phosphorus and also recovering both the ammonia and phosphorus thus removed as useful resources. SOLUTION: This method comprises the steps wherein in a 1st phosphorus-removing means 2, a magnesium salt is added to wastewater containing both ammonia and phosphorus to separate and collect the phosphorus and part of the ammonia in a liquid phase in the form of magnesium phosphate; secondly, in a 1st nitrification means 6, the resultant wastewater is contacted with a microorganismal colony in an aerobic condition to oxidize about half of the ammonia in the liquid phase into nitrous acid; subsequently, in an ammonia oxidation means 7, the resultant wastewater is contacted with a microorganismal colony in an anaerobic condition to convert the remaining ammonia and the nitrous acid in the liquid phase to molecular nitrogen, which is expelled out of the system; wherein the ammonia oxidation means 7 is equipped with 2nd and 3rd nitrification means 13, 14 and a 2nd phosphorus-removing means 15 involving aluminum sulfate-deposited activated alumina to intend denitrification efficiency improvement and advanced phosphorus treatment.

Method and arrangement for treating wastewater containing both ammonia and phosphorus

PROBLEM TO BE SOLVED: To efficiently remove the ammonia included in waste water. SOLUTION: Ammonia-containing waste water introduced into a first stage reaction chamber 1 from outside the system is brought into contact with microorganism groups under an aerobic state to oxidize the ammonia component included in a liquid phase to nitrous acid. The treated water in the first stage reaction chamber 1 is brought into contact with the microorganism groups under an anaerobic state to convert the ammonia component and nitrous acid component included in the liquid phase to gaseous nitrogen in a second stage reaction chamber 2. A seed sludge supply means 11 which supplies the seed sludge containing the ammonia oxidation bacterium groups acclimatized by activated sludge 111, ammonia oxidation bacterium media 112 and nitrous acid oxidation bacterium inhibitor 113 to the first stage reaction chamber 1 is annexed to the chamber 1. The nitrous acid oxidation bacterium inhibitor 113 are intermittently supplied to the chamber 1, by which nitrous acid formation type nitrification is maintained.

Ammonia-containing waste water treatment method and device therefor

PROBLEM TO BE SOLVED: To effectively utilize gas produced by pyrolysis of biomass by subjecting the gas to biological treatment. SOLUTION: A gas consisting essentially of hydrogen and carbon monoxide obtained by pyrolyzing finely ground biomass in a pyrolizer 1 is fed to a heat recovering apparatus 3 to recover heat and then, fed to a methane fermentation tank 9 in which methane producing bacterium exists as preferential seed and methane is produced by methane fermentation. A gas containing carbon dioxide and unreacted carbon monoxide is stored in a gas holder 5. Gas stored in the gas holder 5 is re-fed to the methane fermentation tank 9 to convert the gas to methane. The gas holder 5 feeds gas stored in order to utilize for heat source for producing steam and power generation to a steam generator 25 and gas engine 15. COPYRIGHT: (C)2000,JPO

Treatment of gas produced by pyrolysis of biomass and apparatus therefor

PROBLEM TO BE SOLVED: To efficiently remove organic matter, a nitrogen component (ammonia, nitrous acid and nitric acid), sulfuric acid and a phosphorus component (phosphoric acid) in sewage. SOLUTION: In an ammonoxidation tank 2, ammonia in a liquid phase is oxidized to nitric acid by bringing water to be treated into contact with ozone gas under an alkaline condition and, in a denitrification/desulfurization tank 6, the treated water is brought into contact with an alkali-phile nitrate reducing bacterial group to convert ammonia, nitrous acid, nitric acid and sulfuric acid in a liquid phase to molecular nitrogen and molecular sulfur. A first phosphorus removing means for adding slaked lime to water to be treated to separate phosphorus in a liquid phase as hydroxyapatite is provided to the ammonoxidation tank 2, and a second phosphorus removing means using a chelating resin having copper (divalent) ions supported thereon or aluminum sulfate added active alumina as an adsorbent is provided to the denitrification/ desulfurization tank 6 to highly remove a phosphorus component to use the same as resources.

Method and apparatus for treating sewage

PURPOSE: To provide a treatment process for dehydrated filtrate which can remove nitrogen and phosphorus from dehydrated filtrate of digested sludge, solidify carbon dioxide in combustion exhaust gas of digesting gas and make nitrogen oxide (NO x ) harmless. CONSTITUTION: Slaked lime 20 is added to dehydrated infiltrate of digested sludge discharged out of a digestion tank 1 and pH is adjusted, agitated and mixed, and phosphorus is precipitation separated in a precipitation tank 7 as hydroxyapatite 21. Alkali 23 is injected into supernatant in an ammonia stripping tank 8, and based on the principle that air is bubbled under a strong alkali condition to diffuse ammonia in the dehydrated infiltrate to a gas phase and remove therefrom, gas containing ammonia is further fed into a denitrifying catalyst reaction column 9. On the other hand, methane gas produced in the digestion tank 1 is burnt, and comustion exhaust gas containing CO 2 and NO x is fed into the denitrifying catalyst column 9 to reduce and decompose NO x in the presense of the catalyst while mixing the exhaust gas with gas containing ammonia. COPYRIGHT: (C)1994,JPO

Akira Matsunaga

Papers

Method and arrangement for treating wastewater containing both ammonia and phosphorus

Ammonia-containing waste water treatment method and device therefor

Treatment of gas produced by pyrolysis of biomass and apparatus therefor

Method and apparatus for treating sewage

Treatment process for digested sludge dehydrated filtrate