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Concentrated seawater treatment method

A treatment method and technology for concentrated seawater, which are applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., which can solve problems such as increased operating costs, equipment hazards, and extraction difficulties. , to achieve the effect of increasing operating cost, simple operation and flexible process

Active Publication Date: 2014-02-26
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to provide a concentrated seawater treatment method, which is a concentrated seawater treatment method based on nanofiltration technology, to obtain softened seawater products, that is, permeated side brine with low divalent ion concentration, and then Through various comprehensive utilization of side brine, it overcomes the fact that during the direct utilization of concentrated seawater, precipitation is easily formed due to the high content of divalent ions, which causes harm to equipment and increases operating costs. At the same time, the existence of impurity ions also It brings difficulties to the extraction of other high-use value chemical elements and reduces many shortcomings of production efficiency and economy

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  • Concentrated seawater treatment method

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Experimental program
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Effect test

Embodiment 1

[0025] The first step, chemical pretreatment of raw material concentrated seawater

[0026] Using concentrated seawater produced by reverse osmosis seawater desalination with a recovery rate of 50% as raw material, first use 5m 3 / h speed input raw material concentrated seawater into the pipeline, add dilute hydrochloric acid with a mass percentage concentration of 1% online, adjust the pH of the raw material concentrated seawater to 6.85, and then add scale inhibitor 3 with an amount of 1mg / per liter of concentrated seawater Sodium polyphosphate, for mixing;

[0027] In the second step, the particulate matter in the concentrated seawater is removed

[0028] Send the concentrated seawater pretreated with chemicals in the first step into a precision filter with a precision of 5 μm to remove particulate matter in the concentrated seawater;

[0029] The third step, nanofiltration separation

[0030] The concentrated seawater from which the particulate matter is removed in th...

Embodiment 2

[0035] The first step, chemical pretreatment of raw material concentrated seawater

[0036] Using concentrated seawater produced by reverse osmosis seawater desalination with a recovery rate of 50% as raw material, first use 400m 3 / h speed into the delivery pipeline of the raw material concentrated seawater, add dilute hydrochloric acid with a mass percentage concentration of 1% online, and adjust the pH of the raw material concentrated seawater to 7;

[0037] In the second step, the particulate matter in the concentrated seawater is removed

[0038] Send the concentrated seawater pretreated with chemicals in the first step into a precision filter with a precision of 0.1 μm to remove particulate matter in the concentrated seawater;

[0039] The third step, nanofiltration separation

[0040] The concentrated seawater from which particulate matter is removed in the second step is pressurized by a high-pressure pump to an operating pressure of 1.2 MPa, and then enters a na...

Embodiment 3

[0046] The first step, chemical pretreatment of raw material concentrated seawater

[0047] Using concentrated seawater with a salinity of 87.5‰ discharged after seawater cooling treatment as the raw material, firstly use 25m 3 / h speed input raw material concentrated seawater into the pipeline, add dilute hydrochloric acid with a mass percentage concentration of 1% online, adjust the pH=5 of the raw material concentrated seawater, and then add scale inhibitor with an amount of 2mg / liter concentrated seawater for hydrolysis polymaleic anhydride, for mixing;

[0048] In the second step, the particulate matter in the concentrated seawater is removed

[0049]Send the concentrated seawater pretreated with chemicals in the first step into a precision filter with a precision of 10 μm to remove particulate matter in the concentrated seawater;

[0050] The third step, nanofiltration separation

[0051] The concentrated seawater from which particulate matter is removed in the se...

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Abstract

The invention discloses a concentrated seawater treatment method, relates to water treatment, and particularly provides a concentrated seawater treatment method based on a nanofiltration technology. The concentrated seawater treatment method comprises the following steps: pretreating raw concentrated seawater by using dilute hydrochloric acid with the mass percentage concentration of 1% and an antiscalant with a using amount of 0-2 mg per liter of the concentrated seawater; removing particulate matters in the concentrated seawater with a 0.1-10 Mum precision filter; pressurizing the concentrated seawater to an operating pressure of 0.4-2.0 MPa by a high-pressure pump, and entering a nanofiltration assembly pile; and separating the concentrated seawater after nanofiltration to obtain permeable side brine with a low divalent ion concentration on a permeable side of a membrane element and retentate side brine with a high divalent ion concentration on a retentate side of the membrane element. Multiple defects that in the conventional direct utilization process of the concentrated seawater, precipitates are easily caused by the high content of divalent ions, thus causing damage to a device and increasing the running cost are overcome; and the method is simple in operation and flexible in process and can be easily combined with other seawater utilization processes.

Description

technical field [0001] The technical proposal of the present invention relates to the treatment of water, specifically the treatment method of concentrated seawater. Background technique [0002] Seawater desalination technology has become an important means to solve the global water shortage, and has been widely used in the world and has broad application prospects. [0003] At present, the main seawater desalination methods are reverse osmosis method and thermal method, and their general recovery rate does not exceed 50%, so a large amount of concentrated seawater is also produced while fresh water is produced. Concentrated seawater has high salinity, so direct discharge may have an impact on the environment. Concentrated seawater is rich in Na, K, Mg, Li and other chemical resources, and its concentration is nearly double that of seawater, so its comprehensive utilization has become an important research and development direction. CN200810007576.5 discloses a comprehens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/44
Inventor 袁俊生刘杰纪志永刘燕兰郭小甫谢英惠
Owner HEBEI UNIV OF TECH