Chiyoda Chemical Engineering Construction Co., Ltd.

Chiyoda Kako Kensetsu Kabushiki Kaisha

Akinori Kurima

Yoshiharu Tanaka

Hideo Komatsu

Hiroshi Kamata

Yoshinori Yushina

Osamu Mabu

Chiaki Shimodaira

Tadao Kimiwada

Yasuhiro Iwase

An improvement in an apparatus for continuous biological treatment of waste water including a reactor having a feeding pipe and a distribution pipe at the top thereof for introducing waste water into the reactor, and a withdrawing pipe at the bottom thereof for removing treated water, and a particulate carrier having microbes attached thereto disposed within the reactor. The carrier is a particulate material having an apparent specific gravity smaller than the specific gravity of water, making it possible for the particulate material to float on water. A substantially fluidized bed of the carrier is formed by the buoyancy of the particulate material in the downflowing waste water to be treated.

Apparatus for biological treatment of waste water in downflow operation

Apparatus for liquid/solid contact including apparatus for single or multiple fluidized beds provided with one or more trays having a number of inverted frustum-shaped depressions with an opening located therein.

Fluidized bed contact apparatus

This invention relates to biological treatment of waste water using a carrier floatable on water, and more particularly to a novel process for treatment of waste water utilizing a fluidized bed which is formed by supplying waste water in a downflow operation. The process for treatment of waste water of this invention is applicable to both anaerobic and aerobic biological treatment. A good example of the former anaerobic biological treatment to which this invention is applicable is the process wherein the nitrate or nitrite nitrogen which is one of the nitrogen compounds that are at present believed to be one cause of the eutrophication in rivers, lakes, seas, etc. is treated with denitrifying bacteria in an anaerobic condition to be released in the form of nitrogen gas, and the typical of the latter aerobic treatment is the practice in the utilization of the action of the aerobic bacteria which can oxidize organic substances in sewage, industrial waste waters, etc.

Process for biological treatment of waste water in downflow operation

Growing community of inventors

Yokohama, Japan

Akinori Kurima