An anammox reactor capable of improving nitrogen removal efficiency by maintaining activity of microorganisms, and a water treatment method using the anammox reactor are provided. The anammox reactor includes a raw water feed pipe through which raw water is supplied, a raw water discharge pipe through which raw water is discharged to an outside, and a first chamber configured to accommodate ammonium oxidizing bacteria (AOB) and anammox bacteria for performing an anammox process, wherein the raw water feed pipe and the raw water discharge pipe are configured to communicate with the first chamber.

A water treatment apparatus for removing nitrogen in raw water and a water treatment method using the same are provided. The water treatment apparatus includes a denitrification reactor configured to remove nitrogen contained in raw water supplied thereto, a phosphorus treatment tank configured to remove phosphorus (P) contained in the raw water supplied from the denitrification reactor, an anammox reactor configured to remove nitrogen contained in the raw water supplied from the phosphorus treatment tank through an anammox reaction, a partial nitritation tank configured to convert ammonium ions (NH.sub.4.sup.+) remaining untreated in the anammox reaction into nitrite ions (NO.sub.2.sup.), and a sedimentation tank configured to cause settling of suspended matter contained in the raw water supplied from the partial nitritation tank so that sludge forms and discharge the raw water through a raw water discharge pipe.

Processes are disclosed for the microbial nitritation of ammonia that attenuate the production of at least one of nitrate anion and nitrous oxide. The processes use an ME biocatalyst having a highly porous, hydrophilic polymeric structure with ammonia-oxidizing microorganisms substantially irreversibly retained therein. The processes are particularly useful for integration with anammox processes.

Disclosed is a bioreactor for treating sewage comprising an aerobic tank including a mixing cell for receiving sewage to be supplied from an inlet and mixing the sewage with activated sludge and an aerobic reactor tank in which the activated sludge adsorbs organic substance existing in the sewage; a backwashing cartridge filter for removing floc resulting from growth of the activated sludge adsorbing the organic substance; and an anaerobic tank for carrying out a denitrification process for denitrifying treated water flowed through the backwashing cartridge filter using anaerobic ammonium oxidation (anammox) bacteria wherein the backwashing cartridge filter allows the sewage discharged from the aerobic tank to pass through the cartridge filter and separates the floc and the treated water using difference in size between the floc contained in the sewage and pores in the cartridge filter, and wherein foreign matter adsorbed on the cartridge filter is easily removed by means of washing water to be injected into the cartridge filter.

A method for the treatment of water, the method comprising the steps of anaerobic uptake and storage of at least a portion of the organic components in the water by a heterotrophic denitrifying biomass absorption of ammonium ions with an ammonium ion absorbent; and aerobic oxidation of the absorbed ammonium by a nitrifying biomass comprising ammonium oxidizing microorganisms, wherein the step of aerobic oxidation of the absorbed ammonium is preceded by the step of exposing at least a portion of the nitrifying biomass to atmospheric oxygen.

A waste water treatment includes a biological filtration tank, a nitritation tank, and an anammox tank. The biological filtration tank performs biological filtration as a pretreatment process with regard to influent waste water and removes solids and organic matters. The nitritation tank performs a nitritation process with regard to waste water flowing from the biological filtration tank and supplies an electron acceptor needed for removing the organic matter in the biological filtration tank by returning some of the waste water back to the biological filtration tank. The anammox tank performs an anaerobic ammonium oxidizing process with regard to the waste water received from the biological filtration tank and the nitritation tank.

The present invention relates to a wastewater treatment apparatus for shortcut nitrogen removal using anaerobic ammonium oxidation (ANAMMOX) and partial nitritation using ammonium oxidizing bacteria (AOB) granules. High-purity AOB granules are formed by means of AOB predominance using a side stream generated during a sludge treatment process. Moreover, the formed AOB granules are supplied to a partial nitritation tank (130) of a main treatment process and thus the partial nitritation is efficiently performed and nitrogen is quickly removed, and thus oxygen and an organic material is reduced compared to an existing method.

A septic tank system includes a multiple compartmented (or chambered) supplemental tank. The supplemental tank has a cover/lid with a plurality of strategically situated access holes (both small and large ports) for servicing the various chambers from above ground.

A system for biological nitrogen removal and negative carbon discharge from wastewater with low carbon-to-nitrogen ratio may include a water intake pump, a carbon capture apparatus, a carbon recovery sedimentation tank, an integrated ammonium apparatus, an autotrophic denitrification apparatus and a denitrification sedimentation tank that are connected in sequence by pipes. The carbon capture apparatus may include an anode chamber communicated with the water intake pump via a water inlet pipe and a cathode chamber communicated with the carbon recovery sedimentation tank via a first water outlet pipe. The anode and cathode chambers may be spaced apart by an ion exchange resin membrane. The anode and cathode chambers may be provided with an anode plate and a cathode plate electrically connected to positive and negative electrodes of a power source, respectively. A bottom of the cathode chamber may be provided with aerators connected to a first air compressor by a pipe.

The present invention relates to a biological filtration process for water loaded with nitrogenous pollutants in order to reduce the global nitrogen content of said water, characterised in that it comprises a first step of nitritation and filtration carried out in a first aerated biological reactor, a second step of deammonification, denitrification and filtration carried out in a second non-aerated biological reactor, and a step of evaluation of the ratio of the nitrite content to the ammoniacal nitrogen content of the water at the outlet of the first reactor. When this ratio is greater than a predetermined stoichiometry value, the process according to the invention comprises a step of addition of water to be treated to the water originating from the first reactor so as to obtain, at the inlet of the second reactor, a mixture having a ratio of the nitrite content to the ammoniacal nitrogen content that is close to the stoichiometric ratio of the Anammox reaction.