Hitachi Plant Technologies, Ltd.

Hitachi Plant Engineering Construction Co., Ltd.

Hitachi, Ltd.

Organo Corporation

Taisei Corporation

Kazuichi Isaka

Tatsuo Sumino

Yuya Kimura

Naoki Abe

Shinichi Yoshikawa

Satoshi Tsuneda

Yutaka Tsuda

Norifumi Yamamoto

Masahiro Eguchi

Tasuo Sumino

Jun Kusaka

Atsushi Itagaki

An object is to provide a degrading bacteria-immobilized carrier on which a 1,4-dioxane-degrading bacterium is supported, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier. As a means for achieving the object, a degrading bacteria-immobilized carrier comprising a porous carrier and a 1,4-dioxane-degrading bacterium supported on the porous carrier, as well as a biodegradation treatment method for organic compounds, and a biodegradation treatment apparatus, both using this carrier, are provided.

Dioxane-degrading bacteria-immobilized carrier, biodegradation treatment method, and biodegradation treatment apparatus

Provided are an immobilization carrier, a polyether compound used for production thereof and a method for producing the carrier. The immobilization carrier have both excellent strength and toughness while a content of a polymer forming hydrous gel is suppressed, The immobilization carrier includes a polymer having a repeated unit provided with a bisphenol group and a polyoxyalkylene group bonded to the bisphenol group. The polyoxyalkylene group is formed via copolymerization between an oxyethylene group and an oxyalkylene group with 3 or more carbon atoms and optionally having a substituent. A method for producing the immobilization carrier includes the step of preparing hydrous gel via polymerizing a polyether compound in an aqueous solution. The polyether compound includes a bisphenol group, a polyoxyalkylene group and a polymerizable group. The immobilization carrier may be applied to a microorganism immobilization carrier used for treating wastewater.

Immobilizing carrier, polyether compound used for producing same and method for producing immobilization carrier

An aspect of the present invention provides a wastewater treatment method for treating wastewater containing ammonium nitrogen, including the steps of: oxidizing the ammonium nitrogen in the wastewater to nitrite with nitrifying bacteria in a treatment tank in which the nitrifying bacteria and anaerobic ammonium-oxidizing bacteria having a half-saturation constant of 6.1 mgN/L or more with respect to nitrite coexist; and denitrifying the nitrite formed through the oxidation of the ammonium nitrogen, with the anaerobic ammonium-oxidizing bacteria in the treatment tank, while using the ammonium nitrogen contained in the wastewater as a hydrogen donor. The method employs the anaerobic ammonium-oxidizing bacteria that can maintain the denitrification activity even under a condition in which the amount of dissolved oxygen is large, consequently can easily maintain the activities of both of the nitrifying bacteria and the anaerobic ammonium-oxidizing bacteria which coexist in the same treatment tank, and can rapidly perform wastewater treatment.

Wastewater treatment method and wastewater treatment apparatus

A nitrification carrier having made nitrifying bacteria dominant therein and a denitrification carrier having made anaerobic ammonium-oxidizing bacteria dominant therein are mixed in a treatment tank. Both of a nitrification reaction with the nitrification carrier and a denitrification reaction with denitrification carrier are allowed to proceed in the treatment tank to decompose ammonium nitrogen in wastewater to nitrogen gas. The ratio of the bacterial loads of the nitrifying bacteria and the anaerobic ammonium-oxidizing bacteria can be easily controlled by immobilizing the nitrifying bacteria and the anaerobic ammonium-oxidizing bacteria on different carriers from each other (nitrification carrier and denitrification carrier) and by controlling the volume ratio (ratio of the feeding amounts) of the nitrification carrier and the denitrification carrier.

A wastewater treatment method for treating wastewater containing ammonium nitrogen, includes the steps of: charging an unacclimated denitrification carrier containing anaerobic ammonium-oxidizing bacteria into a treatment tank; charging an unacclimated nitrification carrier containing nitrifying bacteria into the treatment tank; acclimating the unacclimated denitrification carrier in the treatment tank under an anaerobic condition; acclimating the unacclimated nitrification carrier in the treatment tank under an aerobic condition, after having acclimated the denitrification carrier; nitriting the ammonium nitrogen in the wastewater to generate nitrite with the acclimated nitrification carrier; and denitrifying the nitrite generated by nitriting the ammonium nitrogen with the acclimated denitrification carrier, while using the ammonium nitrogen in the wastewater as a hydrogen donor.

Wastewater treatment method

Equipment for treating wastewater by anaerobic ammonium oxidation includes an anaerobic ammonium oxidation vessel to receive water to be treated containing ammonium and nitrite and to denitrify ammonium and nitrite in the water by anaerobic ammonium oxidizing bacteria, forming denitrified treated water, an acclimatization vessel downstream from the anaerobic ammonium oxidation vessel to receive the denitrified treated water from the anaerobic ammonium oxidation vessel, the acclimization vessel containing an immobilizing material that collects the anaerobic ammonium oxidizing bacteria in the denitrified treated water as immobilized microorganisms attached to the immobilizing material, wherein the acclimatization vessel has a structure such that the immobilizing material is prevented from flowing out of the acclimatization vessel, and a pipe connecting the acclimatization vessel to the anaerobic ammonium oxidation vessel.

Equipment for wastewater treatment comprising anaerobic ammonium oxidation vessel and acclimatization vessel

The present invention can feed substrates without waste to generate seed sludge with high bacterial cell concentrations and can start up operation within a short time, in cultivating anaerobic ammonium oxidizing bacteria with ammonium and nitrite as substrates. Equipment for cultivating anaerobic ammonium-oxidizing bacteria, which cultivates, in a cultivation tank, novel anaerobic ammonium-oxidizing bacteria that anaerobically denitrify nitrite and ammonium used as substrates, comprises an ammonium feed device which feeds ammonium at a given concentration into the cultivation tank, a nitrite feed device which feeds nitrite at a given concentration into the cultivation tank, and a control device which controls a feed rate Y of the substrate.

Method and equipment for cultivating anaerobic ammonium-oxidizing bacteria

Entrapping immobilization pellets for purifying breeding water in an aquarium to breed aquatic animals, wherein the entrapping immobilization pellets have a phosphorus content of 0.05 mass % or less.

Entrapping immobilization pellets for purifying breeding water, process and apparatus for purifying breeding water, and aquarium set

A method for collecting bacterial cells includes feeding water containing ammonium and nitrite to an anaerobic ammonium oxidation vessel to denitrify ammonium and nitrite by anaerobic ammonium oxidizing bacteria provided in the anaerobic ammonium oxidation vessel to form denitrified water containing an amount of the anaerobic ammonium oxidizing bacteria and a sludge containing an amount of the anaerobic ammonium oxidizing bacteria; and feeding the denitrified water containing an amount of the anaerobic ammonium oxidizing bacteria and the sludge containing an amount of the anaerobic ammonium oxidizing bacteria to a precipitation vessel, in which an acclimatization container is stored, to cause the anaerobic ammonium oxidizing bacteria in the denitrified water to be attached to an immobilizing material in the acclimatization container, so that the anaerobic ammonium oxidizing bacteria in the denitrified water are collected, and, at the same time, to collect the anaerobic ammonium oxidizing bacteria of the sludge in a separated sludge by solid-liquid separation in the precipitation vessel.

Method and apparatus for collecting and acclimatizing anaerobic ammonium oxidizing bacteria, and denitrifying water

Entrapping immobilization pellets for purifying breeding water in an aquarium to breed aquatic animals,

Provided are a nitrite-type nitrification carrier and a method for producing the same and a method and an apparatus for removing nitrogen using the same, in which the quantity of organic matter to be added can be substantially reduced to reduce running cost. A method for producing a nitrite-type nitrification carrier in which ammonia-oxidizing bacteria for nitrifying ammonium to nitrite is preferentially accumulated comprises the steps of: entrapping and immobilizing any sludge selected from sediment from a lake, a river or the sea, soil from the surface of the earth, or activated sludge from a sewage-treatment plant into a monomer or a prepolymer for immobilizing microorganisms; and then subjecting the entrapped and immobilized sludge to heat treatment at 30 to 80&#xb0; C.

Nitrogen removing apparatus comprising nitrification carrier containing ammonia-oxidizing bacteria

Method of producing a nitrification carrier containing ammonia-oxidizing bacteria for removing nitrogen

The process for treating an ammonium containing liquid by denitrification treatment of an ammonium containing liquid containing at least ammonium comprises carrying out nitrate reduction treatment of reducing nitrate contained in or added to the ammonium containing liquid to nitrite, and carrying out anaerobic ammonium oxidation treatment of simultaneously anaerobically denitrifying nitrite produced in the nitrate reduction treatment and ammonium contained in the ammonium containing liquid by anaerobic ammonium oxidizing bacteria.

Process and equipment for treating ammonium containing liquid

A method for collecting bacterial cells comprising the steps of:

Growing community of inventors

Tokyo, Japan

Kazuichi Isaka