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Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer

A technology for acidic wastewater and seawater depth, applied in seawater treatment, adsorption water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problem of strong corrosion of inorganic flocculants, affecting seawater desalination seawater utilization cost, water quality turbidity index difficult to meet the requirements

Inactive Publication Date: 2007-06-20
TIANJIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some also use inorganic flocculants alone for flocculation pretreatment, and the traditional inorganic flocculants are extremely corrosive, causing serious corrosion to the device, and the turbidity index of the treated water is still difficult to meet the requirements, which increases the burden of post-treatment , which directly affects seawater desalination and other seawater utilization costs

Method used

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  • Method for removing cloud point of sea water drasticlly and producing acid waste-water neutralizer

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] In order to investigate the turbidity removal effect of adding sodium hydroxide to adjust the pH value of seawater, measure 600ml seawater and stir it at a speed of 250r / min. At room temperature, add 4mol / L sodium hydroxide solution to adjust the pH value of seawater. After stirring for 10min, add 0.15ppm polyacrylamide (PAM), adjust the stirring speed, stir at 120r / min for 1min, let it stand for 10h, and measure its turbidity. Raw seawater turbidity: 49.30NTU, pH value: 8.01, water temperature: 14°C, treatment results are shown in the table below.

[0015] Table 1 Effect of different pH values ​​on seawater turbidity removal

[0016] Test number

[0017] It can be seen from Table 1 that the turbidity removal effect of seawater is better when the pH value is adjusted to 10.59-11.51 with sodium hydroxide, and the effect is the best when the pH is 10.66.

example 2

[0019] In order to investigate the turbidity removal effect of adding trace amounts of polyferric chloride to seawater at the same pH value, measure 600ml seawater at a stirring speed of about 250r / min, and add 4mol / L sodium hydroxide solution at room temperature to adjust the pH value to 10.59, add a small amount of polyferric chloride (PFC), stir for 10 minutes, add 0.15ppm of 0.2% polyacrylamide (PAM), stir at 120r / min for 1min, let it stand for 10h, and measure its turbidity. Raw seawater turbidity: 49.30NTU, pH value: 8.01, water temperature: 14°C, treatment results are shown in the table below.

[0020] Table 2 The turbidity removal effect of seawater with the same amount of PFC added

[0021] Test serial number

[0022] It can be seen from Table 2 that when the pH value of seawater is adjusted to 10.59 with sodium hydroxide, the effect of removing turbidity on seawater is better when the addition amount of PFC is 0.110ppm.

example 3

[0024] In order to investigate the turbidity removal effect of calcium hydroxide on seawater at different pH values, take 600ml of seawater and stir at a speed of 250r / min. At room temperature, add 0.023mol / L calcium hydroxide solution to adjust the pH value. After stirring for 10min, Add 0.15ppm of polyacrylamide (PAM), stir at 120r / min for 1min, let it stand for 10h, and measure its turbidity. Raw seawater turbidity: 49.30NTU, pH value: 8.01, water temperature: 14°C, treatment results are shown in the table below.

[0025] Table 3 Effects of different pH values ​​on seawater turbidity removal

[0026]

[0027] It can be seen from Table 3 that adjusting the pH value to 10.06 with calcium hydroxide has a better effect of removing turbidity.

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Abstract

Alkali treatment for sea water with sodium hydrate as basifier is carried out by regulating sea-water pH value by basifier addition, reacting magnesium salt with alkali to generate magnesium hydrate with strong adsorptive function, and adsorbing rapidly electric colloid, suspended substance, microbe, bacterial and algae. It has faster flocculation depositing speed, gentle reactive condition, simple process and less investment. It can be used as acid waster-water neutralizer and magnesium hydrate slurry.

Description

technical field [0001] The present invention uses sodium hydroxide etc. as an alkalizing agent to directly alkalize seawater, and the seawater after alkalization can achieve the purpose of deep turbidity removal, and the co-production of magnesium hydroxide slurry can be used as acid Wastewater neutralizer. Background technique [0002] At present, my country's water resources are seriously in short supply. Most of the existing water systems have caused pollution and damage to varying degrees. It is imminent to develop new fresh water resources. Seawater is the most abundant and stable water source among water resources, and the amount of water is not affected by climate and other factors. It is imperative to carry out research on seawater purification technology and develop and utilize seawater. At present, there are many industries that require deep turbidity removal pretreatment of seawater, mainly including seawater utilization (including seawater desalination and dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/28C02F103/08C02F1/66
Inventor 衣守志钟素红
Owner TIANJIN UNIV OF SCI & TECH
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