Mitsubishi Electric Corporation

Kabushiki Kaisha Toshiba

Hiromichi Koga

Koichi Tokimori

Hiroyuki Arai

Seiji Yamamoto

Masato Okamura

Nozomu Yasunaga

Osamu Shibasaki

Tetsuo Oosato

Koji Negishi

Shinsuke Goto

A water treatment membrane washing apparatus includes two ozone dissolving tanks for storing filtrate generated by filtering raw water through a water treatment membrane and gas aspirators provided for the respective ozone dissolving tanks, for mixing the filtrate with ozone gas supplied from an ozone supply unit to generate ozone gas containing filtrate, and is configured such that waste ozone gas generated in one of the ozone dissolving tanks is aspirated by the gas aspirator provided for the other ozone dissolving tank. After the filtrate from the raw water is pretreated by being mixed with the waste ozone gas in the aspirator, the pretreated filtrate is mixed with the ozone gas in the other ozone dissolving tank until it reaches a predetermined concentration. The ozone gas containing filtrate is supplied from the secondary side of the water treatment membrane to the primary side thereof to wash the eater treatment membrane.

Water treatment membrane washing apparatus and water treatment membrane washing method

A cleaning device includes: an ozone gas supply portion; an ozone dissolution tank including a gas phase portion in which ozone gas is to be accumulated and a liquid phase portion formed by water in which the ozone gas is to be dissolved; a gas phase portion ozone gas supply pipe for supplying ozone gas from the ozone gas supply portion to the gas phase portion; a liquid phase portion ozone gas supply pipe for supplying ozone gas from the ozone gas supply portion to the liquid phase portion; and an ozone water supply pipe for supplying ozone water generated in the ozone dissolution tank to a filtering secondary side, wherein the ozone water is supplied to the filtering secondary side by the pressure of ozone gas in the gas phase portion.

Device for cleaning and method for cleaning water treatment membrane, and water treatment system

A chemical solution injection systemof an embodiment includes: a chemical solution reservoirthat stores a chemical solution containing a depositing substance to deposit to a member in contact with cooling water for absorbing heat in a plant; a pipethrough which the chemical solution passes; a first heat exchanger and a second heat exchanger that exchange heat between the cooling water and the chemical solution; a cooling water pipewhich connects the heat exchangers in series and in which the cooling water passes; and a pumpthat conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoiris lower than that of the cooling water. The pipesequentially connects the chemical solution reservoir, the first heat exchanger, the second heat exchanger and the plant. The cooling water guided from the inside of the plant passes through the second heat exchanger and subsequently passes through the first heat exchanger. The chemical solution passes through the first heat exchanger and subsequently passes through the second heat exchanger.

Chemical solution injection system and chemical solution injection method

Growing community of inventors

Tokyo, Japan

Hiromichi Koga