Hitachi Plant Engineering Construction Co., Ltd.

Hitachi Plant Technologies, Ltd.

Other

Japan Sewage Works Agency

Hiroyoshi Emori

Tatsuo Sumino

Hiroki Nakamura

Kazuhiko Noto

Takako Ogasawara

Masataka Kasai

Nobuko Hashimoto

Masaaki Shirai

Naoki Abe

Koutarou Aoyama

Naomichi Mori

Takayuki Kouno

Takayuki Nakamura

Syuzo Koike

Minoru Kayanoki

Toshio Yamadera

Takashi Kimata

Yuuko Fujii

Masami Hotta

Tamotsu Mizuguchi

Yukio Kawaguchi

Syouji Harada

Minoru Tada

Ryuichi Matsuyama

Tamio Igarashi

Tsutomu Minaki

A large amount of entrapping immobilization pellets with highly stable quality are produced inexpensively by high-speed treatment. There is provided a process for producing entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing agent, the process comprising polymerizing a mixture containing the microorganisms and a solution of the immobilizing agent in a forming frame into a gel to prepare a pellet block.

Apparatus for producing pellets containing entrapped and immobilized microorganisms

Process for producing pellets entrapping and immobilizing microorganisms

A process for storing entrapping immobilization pellets in which microorganisms are entrapped and immobilized in an immobilizing material until the entrapping immobilization pellets are used in a treatment tank, the process comprising:

Process for producing pellets containing entrapped microorganisms

An oligomer is provided having a polyalkylene glycol main structure, a polymeric double bond group arranged at both ends of the main structure, and a sub-structure arranged between the main structure and each polymeric double bond group. The sub-structures lengthen the main structure, and are composed of a urethane bond and an ethyleneoxy, or a urethane bond, an ethyleneoxy and a propyleneoxy. The introduction of urethane bonds causes crystallization (network formation) with the urethane bonds themselves so that a hydrous gel resulting from polymerizing the oligomer has increased flexibility, strength and erosion resistance. As a result, even though the main structure is lengthened to increase capacity to entrap microorganisms, the strength of the hydrous gel is not reduced. The ethyleneoxy weakens hydrophobicity of urethane regions to improve affinity of the gel for microorganisms. Microorganisms can adhere to and grow on the surface of a hydrous gel produced by polymerizing the oligomer. A hydrous gel containing entrapped microorganisms can be formed by mixing microorganisms with the oligomer and polymerizing. Environmental pollutants can be decomposed using the hydrous gel containing microorganisms.

Oligomers for polymerizing to produce hydrous gels entrapping microorganisms

In a method of biologically removing nitrogen and a system therefor according to the present invention, by utilizing the characteristics of AH bacteria as being nitrifying bacteria of nitrous acid type for displaying high activity at the high concentration of ammonium nitrogen and the characteristics of AL bacteria as being nitrifying bacteria of nitrous acid type for displaying high activity at the low concentration of the ammonium nitrogen, in the nitrifying process, operations capable of obtaining the maximum nitrifying speed in accordance with the concentration of the ammonium nitrogen can be performed, and the nitrifying reaction of nitrous acid type for producing nitrous acid as being an intermediate oxide material of the ammonium nitrogen can be performed.

Method of biologically removing nitrogen and system therefor

A system for treating waste water using a particulate body formed by covering and fixing nitrifying bacteria. In the system, the particulate body is inserted in a nitrifying vessel which including therein an air diffusion device for supplying oxygen to the nitrifying bacteria and a particulate body separation device for preventing the outflow of the particulate body. The nitrifying vessel and the particulate body contained therein are used as a nitrifying vessel unit and one or more such nitrifying vessel units are arranged within a treating tank. Waste water is circulated between the nitrifying vessel and the other portions of the treating tank than the nitrifying vessel by means of the air lift effect of the air diffused from the air diffusion device.

System for treating waste water by nitrification

Growing community of inventors

Tokyo, Japan

Hiroyoshi Emori