Kabushiki Kaisha Toshiba

Takashi Menju

Atsushi Yukawa

Nobuyuki Ashikaga

Hirofumi Noguchi

Yasushi Yamamoto

Kazuyoshi Aoki

Ryoichi Arimura

Hiromi Tsukui

Shinji Oono

Mii Fukuda

Katsuya Yamamoto

Norimitsu Abe

Takeshi Matsushiro

Futoshi Kurokawa

Masahiko Tsutsumi

Yasuhiko Nagamori

Tokusuke Hayami

Takumi Obara

A solid-liquid separator that separates raw water containing suspended solids into suspended solids (solid) and treated water (liquid) in easy and a short time is provided. A solid-liquid separator includes a separation tub, an inflow pipe configured to rotate raw water which flowed from the outlet of the inflow pipe in the separation tub, a froth discharge pipe configured to discharge the suspended solids surfaced in the separation tub and a treated water discharge pipe configured to discharge treated water by which the suspended solids were removed from raw water from the separation tub.

Solid-liquid separator

A liquid cyclone is configured for inflowing raw water containing impurities as targets of collection to be forced to swirl inside to spin down impurities contained in raw water, an inflow pipe is connected with an upper portion of the liquid cyclone to supply the liquid cyclone with raw water, and configured for supplied raw water to be forced to swirl inside the liquid cyclone, a connecting portion is connected with a lower portion of the liquid cyclone, and configured with a discharge port to discharge spun down impurities from the liquid cyclone, an impurity collector is connected to the liquid cyclone with the connecting portion in between, and configured to collect impurities discharged from the liquid cyclone, an obstacle is disposed in or near the discharge port, , and configured to prevent impurities collected in the impurity collector from backing up into the liquid cyclone, and an outflow pipe is connected with a top portion of the liquid cyclone, and configured for raw water having got rid of impurities to outflow as treated water from the liquid cyclone, whereby impurities separated from raw water is prevented from being re-mixed in raw water, allowing for an enhanced separation performance.

An activated carbon adder adds activated carbon to raw water before flocculating sedimentation, to adsorb suspended matter contained in raw water, a liquid cyclone is adapted to separate activated carbon with suspended matter adsorbed thereon, from raw water containing activated carbon, an inflow line is connected with the liquid cyclone so as to cause raw water containing activated carbon before flocculating sedimentation to flow into the liquid cyclone and swirl therein, an activated carbon discharge line discharges activated carbon spun down out of raw water containing activated carbon in the liquid cyclone, from the liquid cyclone, and a pretreated water discharge line discharges raw water having got rid of activated carbon as pretreated water from the liquid cyclone, allowing for a reduced amount of chemicals to be used, with production of a reduced amount of sludge.

A former () works, when supplied with wastewater containing heavy metals and hydrogen sulfide, to react heavy metals contained in wastewater with hydrogen sulfide to form sulfide salts, an acquirer () works, when supplied with sulfide salts and acid, to acquire hydrogen sulfide and heavy metal ions produced by reactions between sulfide salts and acid, a hydrogen sulfide supply line () supplies hydrogen sulfide acquired by the acquirer to the former, and a collection line () collects heavy metal ions.

Heavy metal collection system

An aeration-less water treatment system includes an anaerobic treatment tank which subjects sewage supplied by a pump to anaerobic treatment by causing the sewage to upflow, and an aerobic treatment tank which subjects anaerobically treated water to aerobic treatment by letting the anaerobically treated water to downflow by natural downflow. The aerobic treatment tank includes an aerobic filter bed section in which carriers to which aerobic microorganisms are adhered are arranged. The aerobic filter bed section subjects the anaerobically treated water to decomposition treatment by putting the anaerobic treatment water in contact with the aerobic microorganisms adhered to surfaces of the carriers. The aerobic filter bed section is provided with an air port which takes in air into under normal pressure, thereby activating the aerobic microorganisms.

Water treatment system

Growing community of inventors

Kawasaki, Japan

Takashi Menju