Desalination system and desalination method

A desalination and fluid technology, applied in the field of desalination system, can solve problems such as precipitation or scaling, damaged membrane, unfavorable membrane separation device, etc.

Active Publication Date: 2015-04-22
BL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high concentration of insoluble or partially soluble substances in the fluid and the limitation of the antiscalant effect, in some cases, even with the use of antiscalants, insoluble or partially soluble substances still precipitate or Fouling to damage the membrane
This is not good for membrane separation devices used for water recovery

Method used

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  • Desalination system and desalination method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0034] In this illustrative experiment, the concentrated fluid 16 comprised approximately 200 ml of a calcium sulfate solution with a supersaturation of 600%. The calcium sulfate solution contains approximately 3 ppm of antiscalant (MDC151 antiscalant from General Electric Water Treatment Business Group) to prevent precipitation of the calcium sulfate solution at this supersaturation. In this state, the conductivity of calcium sulfate solution is about 19.23mS / cm; its pH value is about 6.5; its turbidity is about 0.113NTU.

[0035] Subsequently, 1 mol / l hydrochloric acid solution was added to the calcium sulfate solution to adjust its pH value to about 1.3 to adjust the scale inhibitor. In this state, when the pH is adjusted, the calcium sulfate solution starts to become cloudy, and calcium sulfate particles can be found to precipitate in the solution. After pH adjustment, the conductivity of the calcium sulfate solution at this time is about 15.37mS / cm; its pH value is about...

example 2

[0037] In this illustrative experiment, the concentrated fluid 16 comprised approximately 200 ml of a calcium sulfate solution with a supersaturation of 600%. The calcium sulfate solution contains approximately 3 ppm of antiscalant (MDC151 antiscalant from General Electric Water Treatment Business Group) to prevent precipitation of the calcium sulfate solution at this supersaturation. In this state, the conductivity of calcium sulfate solution is about 19.23mS / cm; its pH value is about 6.5; its turbidity is about 0.113NTU.

[0038] Subsequently, the calcium sulfate solution was heated to 100° C. to adjust the antiscalant in it, and then cooled to room temperature (Room Temperature). During heating, the calcium sulphate solution becomes cloudy initially, and calcium sulphate particles can be found to precipitate in the solution. After being cooled to room temperature, in this state, the conductivity of calcium sulfate solution is about 15.61mS / cm; its turbidity is about 3175NT...

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Abstract

[0042] A desalination system comprises a membrane separation device (12) and an adjustment unit (14). The membrane separation device (12) is configured to receive a feed stream (11) including one or more antiscalants and produce a permeate stream (15) and a concentrated stream (16). The adjustment unit (14) is configured to adjust at least a portion of the one or more antiscalants in the concentrated stream (16) from the membrane separation device (12)by decreasing pH of the concentrated stream or by increasing the temperature of the concentrated stream, thereby releasing ions of sparsely soluble salts from their complexes with the antiscalants. The precipitated is separated in a concentration device (13). The concentrated stream is returned to the feed side of the membrane separation device (12), the pH being increased in stream (17) by means of an activation device (18). A desalination method is also presented.

Description

technical field [0001] The present invention relates to a desalination system and method for water recovery (Water Recovery), in particular to a desalination system and method for water recovery using membrane separation devices (Membrane Separation Devices). Background technique [0002] In industrial fields, large volumes of waste water, such as saline aqueous solutions, are produced. Usually, such waste water is not suitable for direct domestic or industrial use. In view of the limited availability of water resources, it is particularly important to recover acceptable usable water from fluids such as wastewater, seawater or other saline solutions. [0003] Membrane separation devices, such as reverse osmosis (Reverse Osmosis, RO) membrane devices, are often used to treat fluids, such as purify water. Usually, the fluid may contain poorly soluble or partially soluble substances, such as calcium sulfate, silicon dioxide, etc. Due to the limitation of the solubility of th...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C02F9/04
CPCC02F1/66C02F9/00C02F1/02C02F5/10C02F1/44C02F2209/06C02F2103/08C02F1/4693C02F2001/007Y02A20/124Y02A20/131
Inventor张呈乾熊日华蔡巍夏子君
OwnerBL TECH INC