Process for producing freshwater
A manufacturing method and fresh water technology, which can be used in chemical instruments and methods, seawater treatment, water pollutants, etc., and can solve the problems of rising water production costs and low efficiency.
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[0184] The total salinity concentration (TDS concentration) of permeated water and feed water is obtained by measuring the conductivity of each liquid with a conductivity meter (Yokokawa Electric Co., Ltd. SC82), and obtaining it from the relationship between the simulated seawater concentration and conductivity measured in advance with simulated seawater. of. In addition, the pH measurement used Yokokawa Denki PH82.
[0185] constitute Figure 7 The evaluation apparatus (hereinafter referred to as apparatus X) of the flow shown. It should be noted, Figure 7 The meanings of the symbols in are also the same as above.
[0186] The device X is composed of a water supply tank 38, a high-pressure pump 7, a first semi-permeable membrane unit 8, a booster pump 14, a second semi-permeable membrane unit 15, and the like. The power of the high-pressure pump 8 is controlled by a transformer, the power of the booster pump 14 is not adjusted, and the pressure of the supply water appli...
reference example 1
[0188] As a normal operation, the seawater near Toray Co., Ltd.'s Ehime factory was pretreated by sand filtration using device X, with a flow rate of 80m 3 / day The pretreatment seawater (TDS concentration 3.4 weight%, water temperature 22 degreeC, pH=7.5) which removed suspended matter was processed. As the membrane element for the first semi-permeable membrane unit, SU-810 manufactured by Toray Co., Ltd. was used, and as the membrane element used for the second semi-permeable membrane unit, SU-710 manufactured by Toray Co., Ltd. was used. The recovery rate of the permeable membrane unit was 30%, and the recovery rate of the second semi-permeable membrane unit was 75%. It should be noted that the operation of adding the anti-fouling agent by using the first anti-scaling agent adding device 3, adding alkali by using the first alkali adding device 4, and adding acid by using the acid adding device 6 is not carried out, but in order to improve the second semi-permeable membrane ...
reference example 2
[0190] As a washing operation, sulfuric acid is added by the acid addition device 6 before the first semi-permeable membrane unit 8, so that the pH of the feed water in the first semi-permeable membrane unit 8 is 3.0, and the use of the second semi-permeable membrane unit 15 is not performed. Operation was carried out under the same conditions as in Reference Example 1 except for the steps of adding the scale inhibitor by the second antiscalant agent adding device 12 and adding alkali by the second alkali adding device 13 . As a result, at a permeate flow rate of 18m 3 Under the condition of per day, the TDS concentration of the permeated water is 1.5 mg / l, the boron concentration is 0.25 mg / l, and the pH of the permeated water is 4.5. In addition, at this time, the addition amount of sulfuric acid in the acid addition device 6 was 530 g / hour, and the addition amount of NaOH in the second alkali addition device was 0 g / day.
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