(CN106477785) 1. A sub sea Bottom Water processing system, which comprises an electrochemical cell, the cell using seawater or oil and gas field production raw or processed water solution of high PH and the low PH creation, during the cleaning cycle, these solutions are prepared by mixing the electrochemical cell through the sub-sea flow line connected to an acid or alkali processing assembly cycle through in situ at least one subsea on-line cleaning the subsea processing assembly processing assembly. 11. An apparatus comprising at least one of water from undersea water introduction (4) port provided in the injection pump (5) to an underwater membrane separation element element the supply line (11-15) Bottom Water processing system of the sea, characterized in, has produced water (17) with sea water or oil and gas field creation high PH and the low PH in electrochemical during a cleaning solution creation unit (16), acids and bases in the film during cleaning cycles, an acid/base creation unit (16) via these cleaning solution with the water injection system of the underwater membrane separation element element connected locally acid or base flow line (18, 19) and valve (20, 21) is circulated through at least one submerged membrane separation element.
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