Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A chemical solution injection system 30 of an embodiment includes: a chemical solution reservoir 31 that 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 pipe 32 through 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 pipe 49 which connects the heat exchangers in series and in which the cooling water passes; and a pump 34 that conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoir 31 is lower than that of the cooling water. The pipe 32 sequentially connects the chemical solution reservoir 31, 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.

Abstract: A chemical solution injection system 30 of an embodiment includes: a chemical solution reservoir 31 that 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 pipe 32 through 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 pipe 49 which connects the heat exchangers in series and in which the cooling water passes; and a pump 34 that conveys the chemical solution. The temperature of the chemical solution in the chemical solution reservoir 31 is lower than that of the cooling water. The pipe 32 sequentially connects the chemical solution reservoir 31, 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.