Hitachi Plant Engineering Construction Co., Ltd.

Masataka Kasai

Hiroki Nakamura

Tatsuo Sumino

Kazuhiko Noto

Hiroyoshi Emori

Takako Ogasawara

Nobuko Hashimoto

Masaaki Shirai

Masayuki Kojima

Toshiyuki Hishinuma

Hiroshi Asakura

Hiroyuki Ichikawa

In an electrolytic bath, an extraction part extracts heavy metal in the internal organs of scallops into an acid solution. A direct current voltage is applied between electrodes, which are provided in the acid solution, to deposit the heavy metal in the acid solution on the electrodes. If the deposit efficiency deteriorates, the polarity applied between the electrodes is reversed from the polarity in the deposition of the heavy metal in a neutral or alkali electrolytic solution. Consequently, the heavy metal is removed from the electrodes. Since arsenic is dissolved in the acid solution, an alkali liquid and a flocculant are added to the acid solution to sediment arsenic.

Method and apparatus for removing toxic substances from waste marine products

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

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Tokyo, Japan

Masataka Kasai