Kurita Water Industries Ltd.

Mitsubishi Electric Corporation

Keiji Uemura

Hirotake Shigemi

Kazuhiko Yamada

Kiyoyasu Maruyama

A video information reproduction system includes first and second video information reproduction devices. A first synchronization signal processor of the video information reproduction device as a master device generates a phase synchronization signal including a first vertical synchronization signal and a first counter value and sends it to the second video information reproduction device. A second synchronization signal processor of the second video information reproduction device as a slave device compares the phase synchronization signal with a second vertical synchronization signal on the basis of a second video clock signal, and a second clock generator changes the frequency of a second decode reference clock signal on the basis of a result of the comparison.

Video information reproduction system and video information reproduction device

A spiral wound type membrane module is formed of a plurality of membranes wound about an axis of the module to form a roll of the membranes and to form feed water channels between the membranes into which feed water flows via a front end of the roll and from which nonpermeated water flows out via a rear end of the roll, wherein the module is operated such that a differential pressure between the feed water flowing into the channels and the nonpermeated water flowing out from the channels is 0.3 kg/cm,or less. The pressure of the feed water is kept at P,or an approximate value of P,which brings a maximum permeate flux at the moment when a predetermined period has passed after starting to supply the feed water into the membrane module continuously at a constant pressure.

Method of operating spiral wound type membrane module

A membrane separation device includes a washing apparatus and a membrane module. The washing apparatus is formed of a vessel for accommodating the membrane module therein, a first tank and a second tank for accommodating washing liquid for washing the membrane module in the vessel and connected to the vessel, a compressed gas feeding device connected to the first and second tanks for selectively feeding compressed gas into the first and second tanks to flow out the liquid therefrom, and conduits connected among the vessel, first and second tanks, and compressed gas feeding device. A conduit selecting device is attached to the conduits for feeding the washing liquid in one of first and second paths. In the first path, the compressed gas in the compressed gas feeding device is fed into the first tank, and the liquid in the first tank is fed into the vessel through the liquid inlet to wash the membrane module accommodated therein and is led to the second tank. In the second path, the compressed gas in the compressed gas feeding device is fed into the second tank, and the liquid in the second tank is fed into the vessel through the liquid inlet to wash the membrane module and is led to the first tank.

Membrane separation device with membrane module and washing apparatus

A spiral wound type membrane module is formed by winding membranes onto a shaft by way of outer spacers. An inner spacer is inserted into the membrane. Raw water is fed from one end of a membrane roll into channels between the membranes. The raw water flows in a direction substantially parallel to the axis of the roll and is taken out from the other end of the roll as nonpermeated water. Water permeated through the membranes flows in the membranes spirally in the winding direction and is taken out from the opening formed on the circumference of the roll.

Spiral wound type membrane module

A module of membranes for permeatingly treating fluid to be treated is housed in a pressure vessel, and, in this pressure vessel, a device for feeding the fluid to be treated is integrally connected to this pressure vessel. The pressure vessel has devices for taking the permeated fluid and the thickened fluid out of the module, respectively.

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Tokyo, Japan

Keiji Uemura