Desalination treatment method for high-salt water

A treatment method, high salt water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. In order to alleviate the shortage of drinking water, solve the difficulty of drinking water, and improve the utilization rate of drinking water

Inactive Publication Date: 2014-12-24
东莞市英硫净水服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The usual way to deal with high-salt water is evaporation, but the current evaporation of high-salt water encounters three major technical bottlenecks: first, the evaporated condensed water has high COD, high ammonia nitrogen, high alkalinity, and high salinity, and is often not suitable for direct drinking Or industrial use, which greatly reduces the performance of condensed water; Second: The evaporator is seriously blocked by fouling, and substances such as calcium, magnesium, heavy metals, chlorides, carbonates and sulfates in high-salt water cause fouling and blockage The main substance makes the heat transfer effect of the evaporator poor, and it needs to be shut down frequently to clear, thereby reducing the production capacity
The removal of the above-mentioned individual substances has long been a mature process, but when a variety of these substances and COD exist at the same time to form a special chemical system, the effective removal effect cannot be achieved by conventional softening methods, so the equipment is seriously corroded. running costs are high
Third: Evaporating from the initial water, the total energy consumption is high, and the use of membrane concentration before evaporation can greatly reduce the total energy consumption, but the membrane is often blocked by the above-mentioned scaling substances

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A method for desalination treatment of high brine with a pH value of 7, comprising the following steps in turn:

[0044] Step 1, electric floatation: add a small amount of ferric sulfate as a flocculant, and add sulfuric acid to adjust the pH to 3.5, and connect to direct current electrolysis for 5 minutes;

[0045] Step 2, micro-electrolysis fluidized bed: the high brine treated in step 1 flows through the three-phase circulating fluidized bed with iron-carbon filler for 0.5 hours.

[0046] Step 3, Fenton reaction: add H 2 o 2 , the reaction temperature is 30° C., and the reaction time is 2 hours.

[0047] Step 4, neutralization and softening: add lime and soda ash, control the reaction time at 0.25 hours, and adjust the pH to 9.

[0048] Step five, membrane filtration; impurities are removed through microfiltration membranes.

[0049] Step 6, Membrane Concentration: Concentrate and treat the obtained high brine through reverse osmosis membrane to obtain membrane c...

Embodiment 2

[0052] A method for desalinating high brine with a pH value of 8, comprising the following steps in turn:

[0053] Step 1, electric flotation: reflux 12% micro-electrolysis fluidized bed effluent into the air flotation tank, add sulfuric acid to adjust the pH to 4.5, and pass through direct current electrolysis for 10 minutes;

[0054] Step 2, micro-electrolysis fluidized bed: the high brine treated in step 2 flows through the three-phase circulating fluidized bed with iron-carbon filler for 0.8 hours.

[0055] Step 3, Fenton reaction: add H 2 o 2 , the reaction temperature is 40° C., and the reaction time is 4 hours.

[0056] Step 4, neutralization and softening: add lime and soda ash, control the reaction time at 0.4 hours, and adjust the pH to 11.

[0057] Step five, membrane filtration; impurities are removed through microfiltration membranes.

[0058] Step 6, Membrane Concentration: Concentrate and treat the obtained high brine through reverse osmosis membrane to obta...

Embodiment 3

[0061] A method for desalinating high brine with a pH value of 7.5, comprising the following steps in turn:

[0062] Step 1, electric flotation: reflux 15% of the water from the micro-electrolysis fluidized bed into the air flotation tank, add sulfuric acid to adjust the pH to 4, and pass through direct current electrolysis for 15 minutes;

[0063] Step 2, micro-electrolysis fluidized bed: the high brine treated in step 2 flows through the three-phase circulating fluidized bed with iron-carbon packing for 1 hour.

[0064] Step 3, Fenton reaction: add H 2 o 2 , the reaction temperature is 50° C., and the reaction time is 5 hours.

[0065] Step 4, softening reaction: add lime and soda ash, control the reaction time at 0.5 hour, and adjust the pH to 10.

[0066] Step five, membrane filtration; impurities are removed through microfiltration membranes.

[0067] Step 6, Membrane Concentration: Concentrate and treat the obtained high brine through reverse osmosis membrane to obta...

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Abstract

The invention relates to a desalination treatment technology for high-salt water, in particular to a desalination treatment method for high-salt water. The desalination treatment method sequentially comprises the following steps: step 1, electric floatation; step 2, microelectrolysis fluidized bed; step 3, Fenton reaction; step 4, neutralization softening; step 5, membrane filtering; step 6, membrane concentrating; step 7, evaporating and collecting condensed water, namely purified fresh water. The desalination treatment method has the characteristics that the treatment effect is great, the service life of equipment is effectively prolonged, and the user performance of the obtained condensed water is high.

Description

technical field [0001] The invention relates to a desalination treatment technology for high-salinity water, in particular to a desalination treatment method for high-salinity water. Background technique [0002] High salt water generally refers to natural water or industrial wastewater with high salinity, high COD, high hardness, and possibly heavy metals, such as groundwater, lakes, and rivers in inland China including Inner Mongolia, Xinjiang, Gansu, Shaanxi, Shanxi, and Qinghai . Due to the low annual precipitation and weak water circulation system in these areas, most rivers have been dry for a long time, resulting in very high salt content in groundwater, lakes, etc., which is called "brackish water" and cannot be drunk. High salt water also exists in China's coastal areas, such as sea estuaries, estuaries and other shallow sea areas. It is a classic sea salt water and has generally been seriously polluted. The other type of high-salt water is the concentrated waste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCY02A20/131
Inventor 袁伟光焦伟丽曾庆波赵锐柏潘成黄家乐张卓智
Owner 东莞市英硫净水服务有限公司
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