Toray Industries, Inc.

Chiyoda Corporation

Masahide Taniguchi

Kazunori Tomioka

Hiroo Takabatake

Tomohiro Maeda

Wakako Ogiwara

Atsushi Kitanaka

Hiroshi Hamada

Hiromi Satoh

Toshinobu Imahama

Masayo Shinohara

Kazuhige Kawamura

Kenji Saito

The present invention provides a method for preparing a water quality profile that has (1) a step 1 for supplying water to be treated to a separation membrane module with a supply port for the water being treated and multiple permeate outlets and obtaining permeate, (2) a step 2 for varying the ratio of the flow rates of the respective permeates flowing out of the multiple permeate outlets, (3) a step 3 after step 2 for measuring the respective water qualities of the permeates, and (4) a step 4 for plotting the relationship between the ratio of the respective permeate flow rates varied in step 2 and the respective water qualities of the permeates measured in step 3 as a scatter diagram, steps 2-4 being repeated multiple times.

Method for preparing water quality profile, method for inspecting separation membrane module, and water treatment apparatus

A membrane separation device includes a separation membrane unit A that has a separation membrane unit component, feed stream side lines F1 and F2, and a permeate stream line P, and a unit for feeding a stream-to-be-treated, wherein a stream-to-be-treated sealing material is provided in the perimeter of an anti-telescoping plate of the separation membrane element, wherein the separation membrane elements can be moved within a cylindrical pressure vessel substantially in either direction, wherein the separation membrane unit is configured to feed the stream-to-be-treated through one of the feed stream side lines F1 and F2 and to discharge the concentrate stream through the other of the feed stream side lines, and wherein the separation membrane unit includes a mechanism that can switch the flow between the feed stream side lines.

Membrane separation device and operation method for membrane separation device

A fresh water generation method by which product water satisfying target water quality can be stably and efficiently obtained even when raw water quality fluctuates, is provided by branching at least a part of a water flow line through which raw waterflows into a plurality of branch lines including a branch line A1 and a branch line A2 and differentiating retention times from branching to joining together between the branch line A1 and the branch line A2, in a fresh water generation method for obtaining product water by treating raw water

Fresh water generation method

Provided is a fresh water production method applying a combined water-treatment technology employing a plurality of semi-permeable membrane units, the method enabling prevention of problems caused by growth of a biofilm and allowing effective use of an injected chemical agent and an injected neutralizing agent. The fresh-water production method produces fresh water by treatment of source water by a semi-permeable membrane treatment device, the concentrated water resulting from the treatment by the semi-permeable membrane treatment device is mixed with other source water, and the water mixture is treated by a second semi-permeable membrane treatment device. A first chemical agent is injected continuously or intermittently into the source water and a second chemical agent is injected continuously or intermittently into the source water.

Fresh water production method

A water producing system which is provided with a semi-permeable membrane treatment process Ato produce membrane permeate Aand concentrate A, a semi-permeable membrane treatment processBwhich is equipped with a treatment target water B branching means for branching treatment target water Binto two or more to produce a membrane Band concentrate B, and a semi-permeable membrane treatment process Cwhich is equipped with a first water mixing means for mixing one of the treatment target water B with at least part of the concentrate A, and subjects the mixed water to the semi-permeable membrane treatment to produce membrane permeate Cand concentrate C, thereby producing fresh water from a plurality of kinds of raw water which differ in osmotic pressure.

Water producing system and operation method therefor

A method of treating wastewater containing an organic compound includes feeding wastewater to an anoxic tank, adding compounds containing nitrogen and phosphorus components to wastewater, performing anaerobic treatment on wastewater, and discharging treated wastewater as pre-treated water; introducing pre-treated water into an anaerobic treatment tank, performing anaerobic treatment on pre-treated water, thereby decomposing the organic compound into organic compounds of smaller molecular size and a mixture gas containing methane and carbon dioxide, and discharging treated water as primary water; introducing primary water into an aerobic treatment tank, performing aerobic treatment on primary water, and discharging treated water through a solid-liquid separator as secondary water; and introducing at least a part of secondary water into a reverse osmosis membrane separation unit, and separating part of secondary water into RO permeated water and RO concentrated brine, wherein at least a part of RO concentrated brine is recycled to the anoxic tank.

Growing community of inventors

Otsu, Japan

Masahide Taniguchi