Seawater treatment method

A treatment method and seawater technology, which are used in the desalination treatment of seawater, the coagulation treatment of seawater and the separation of solids and liquids, which can solve the problems of adding a large amount of inorganic flocculants and increasing the solid content of sludge, preventing pollution and corresponding high sex effect

Inactive Publication Date: 2014-09-03
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the method of Patent Document 1, the addition amount of the inorganic coagulant is large, and as a result, there is a problem that the solid content of the sludge increases due to the chemical agent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0102] Hereinafter, examples and comparative examples will be described. In the following Experiment I (Examples I-1 to I-10, Comparative Examples I-1 to I-9) and Experiment III (Examples III-1 to III-10, Comparative Examples III-1 to III-13) , used relatively clear seawater (hereinafter referred to as "seawater") as the treated water; Experiment II (Example II-1~II-15, Comparative Example II-1~II-8) and Experiment IV (Example IV -1 to IV-8, Comparative Examples IV-1 to IV-16), artificially polluted seawater (hereinafter referred to as "contaminated seawater") was used as the water to be treated.

[0103] The cationic organic coagulants, inorganic coagulants, and phenolic polymers used in Experiments I to IV, and the test methods are as follows.

[0104] [Cationic organic coagulant]

[0105] Cationic organic coagulant 1: a commercially available liquid product of a condensation system of epichlorohydrin and amine (FL2749 manufactured by SNF Corporation). The colloidal equiv...

Embodiment I-1～I-10

[0129] As seawater, the seawater collected in Chatan Town (place name) in Okinawa Prefecture, Japan was adjusted to 24° C., and the cationic organic coagulant and phenolic polymer shown in Table 1 were used to test according to the above test method. Table 1 shows the addition amount of the cationic organic coagulant and the phenolic polymer, the measured value of MFF, and the amount of solid generation. The estimated values ​​of SDI estimated from MFF are also shown in Table 1.

Embodiment II-1～II-15

[0154] Add 3 mg / L acetic acid to the seawater of Experiment I and aerate it for 1 hour. After supplying sufficient oxygen, place it at 20-25°C for 5 days to allow the originally existing marine microorganisms to multiply, thereby preparing polluted seawater. Using this polluted seawater as water to be treated, the same test as Experiment I was performed.

[0155] The types and amounts of cationic organic coagulants and phenolic polymers are shown in Table 2. Table 2 shows the amount of solid generation, MFF measured value, and SDI estimated value.

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Abstract

In a seawater treatment method which comprises subjecting seawater to coagulation with a coagulant and solid-liquid separation and then conducting RO treatment of the resulting seawater, the present invention makes it possible to provide high-quality feed water for the RO treatment, even when the amount of the coagulant added is reduced. The use of this high-quality feed water enables the RO treatment to be stably conducted over a long period. This seawater treatment method is a method for pre-treating seawater prior to membrane separation, said method being characterized by adding a cationic organic flocculant and / or an inorganic coagulant to seawater to conduct reaction, thereafter adding an alkaline solution of a high-molecular compound which has a phenolic hydroxyl group and which is insolubilized under a high salt concentration to the resulting seawater to conduct agglomeration, and then subjecting the thus treated seawater to solid-liquid separation. The treated seawater obtained by the method is thereafter desalinated by membrane separation.

Description

technical field [0001] The invention relates to a pretreatment method for membrane separation treatment of seawater, in particular to a method for coagulation treatment and solid-liquid separation treatment of seawater. In addition, the present invention also relates to a method of performing membrane separation treatment after the treatment, and particularly relates to a method suitable for desalination treatment of seawater. Background technique [0002] Desalination of seawater, which is separated by reverse osmosis (RO) membranes, is widely practiced in the Middle East, where it is difficult to obtain fresh water, and in recent years in China, Australia, and other places. [0003] Before the membrane separation treatment, pretreatment is performed to remove fine clay components in seawater, high molecular organic matter (biopolymers) produced by biological metabolism, and other fouling components that adhere to the RO membrane and reduce the permeation flux (flux) . Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01B01D61/02B01D61/04C02F1/44C02F1/56
CPCC02F1/5236C02F2303/20C02F1/54C02F1/5245B01D2311/04C02F2103/08C02F1/56B01D61/04C02F1/441B01D61/025C02F1/004C02F9/00Y02A20/131B01D2311/2642
Inventor 大井康裕井内智也
Owner KURITA WATER INDUSTRIES LTD
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