JPS6480491A - Production of pure water by reverse-osmosis membrane - Google Patents

Production of pure water by reverse-osmosis membrane

Info

Publication number
JPS6480491A
JPS6480491A JP23703387A JP23703387A JPS6480491A JP S6480491 A JPS6480491 A JP S6480491A JP 23703387 A JP23703387 A JP 23703387A JP 23703387 A JP23703387 A JP 23703387A JP S6480491 A JPS6480491 A JP S6480491A
Authority
JP
Japan
Prior art keywords
reverse
membrane
raw water
osmosis membrane
removal efficiency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP23703387A
Other languages
Japanese (ja)
Inventor
Yoshitaka Yamaki
Yoshiharu Ota
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nomura Micro Science Co Ltd
Original Assignee
Nomura Micro Science Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nomura Micro Science Co Ltd filed Critical Nomura Micro Science Co Ltd
Priority to JP23703387A priority Critical patent/JPS6480491A/en
Publication of JPS6480491A publication Critical patent/JPS6480491A/en
Pending legal-status Critical Current

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  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

PURPOSE:To eliminate the generation of scales on a reverse-osmosis membrane by keeping raw water with an acid or an alkali in the vicinity of the pH at which the maximum salt removal efficiency is exhibited in the allowable pH range of the reverse-osmosis membrane consisting of a polyether composite membrane, etc. CONSTITUTION:The reverse-osmosis membrane 1 such as a polyether composite membrane and a polyvinyl alcohol membrane exhibiting >=95% salt removal efficiency in the allowable pH range is used. The salt removal efficiency of the membrane 1 changes with the pH of the raw water, and the raw water is kept at the pH where the maximum salt removal efficiency is exhibited. The pH of the raw water is controlled by a tank 2 contg. an acid or an alkali and an injection pump 3, and the output of a pH detector 4 is fed back to the injection pump 3 through a pH meter 11. An acrylic polymer is used as an inorg. ion deposition preventing agent, and a strongly alkaline substance is used as a silica deposition preventing agent.
JP23703387A 1987-09-21 1987-09-21 Production of pure water by reverse-osmosis membrane Pending JPS6480491A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP23703387A JPS6480491A (en) 1987-09-21 1987-09-21 Production of pure water by reverse-osmosis membrane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP23703387A JPS6480491A (en) 1987-09-21 1987-09-21 Production of pure water by reverse-osmosis membrane

Publications (1)

Publication Number Publication Date
JPS6480491A true JPS6480491A (en) 1989-03-27

Family

ID=17009400

Family Applications (1)

Application Number Title Priority Date Filing Date
JP23703387A Pending JPS6480491A (en) 1987-09-21 1987-09-21 Production of pure water by reverse-osmosis membrane

Country Status (1)

Country Link
JP (1) JPS6480491A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1106711A2 (en) * 1999-12-09 2001-06-13 Nippon Paint Co., Ltd. Method for recovery of aqueous wash in phosphate chemical conversion and apparatus for metal surface treatment
JP2013156130A (en) * 2012-01-30 2013-08-15 Hitachi-Ge Nuclear Energy Ltd Radioactive waste liquid treatment method and radioactive waste liquid treatment apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1106711A2 (en) * 1999-12-09 2001-06-13 Nippon Paint Co., Ltd. Method for recovery of aqueous wash in phosphate chemical conversion and apparatus for metal surface treatment
JP2013156130A (en) * 2012-01-30 2013-08-15 Hitachi-Ge Nuclear Energy Ltd Radioactive waste liquid treatment method and radioactive waste liquid treatment apparatus

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