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A method for reducing calcium and magnesium ion content in seawater, microbial scale inhibitor and use

A technology of calcium and magnesium ions and microorganisms, applied in seawater treatment, water pollutants, general water supply conservation, etc., can solve problems such as expensive, chemical methods, adverse effects on natural and human environment, and complexity, achieve dense structure, prevent reverse osmosis membranes, etc. The effect of scaling, reducing production and maintenance costs

Active Publication Date: 2021-10-08
SHANGHAI MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the cost of the reagents used is expensive and complicated, the application of chemical methods will also cause adverse effects on the natural and human environments

Method used

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  • A method for reducing calcium and magnesium ion content in seawater, microbial scale inhibitor and use
  • A method for reducing calcium and magnesium ion content in seawater, microbial scale inhibitor and use
  • A method for reducing calcium and magnesium ion content in seawater, microbial scale inhibitor and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Proceed as follows:

[0029] 1. Expanded culture of water-producing Alkaline bacteria

[0030] 1.1 Take out the strains of Alcalibacterium producing water that are stored in 2216E liquid medium containing 20% ​​glycerol at a storage temperature of -80°C, place them at room temperature, recover their vitality, and then inoculate 100 μl of the strains into 2216E liquid In the culture medium, at 37°C, shake culture at 120r / min for 12 hours to obtain the bacterial liquid; use sterile seawater to adjust the bacterial density in the bacterial liquid to 10 8 CFU / ml to obtain microbial antiscalant.

[0031] 1.2 Add the density-adjusted bacterial solution (ie microbial antiscalant) to seawater. Seawater was collected from the East China Sea, filtered by sedimentation, and sterilized in a sterilizing pot at 121°C for 15 minutes to make sterile seawater. The sterile seawater was put into a sterile Erlenmeyer flask; 1ml of bacteria solution (i.e. microbial scale inhibitor), the ...

Embodiment 2

[0043] After the microbial scale inhibitor was added to the seawater in Example 1, the concentration of viable bacteria in the seawater was detected immediately. Doubling dilution was performed with sterile seawater, and 100 μl of the diluted seawater was spread on 2216E solid medium, cultured at 25°C for 72 hours, and the number of colonies was counted to obtain a bacterial concentration of 100,000 CFU / ml in the seawater of Example 1.

Embodiment 3

[0045]Take out the strains of Alcalibacterium in water that are stored in 2216E liquid medium containing 20% ​​glycerol at a storage temperature of -80°C, place them at room temperature, recover their vitality, and then inoculate 100 μl of the strains into 2216E liquid culture medium, at 30°C, 120r / min shaking culture for 16 hours, the bacterial density was greater than 10 8 CFU / ml microbial antiscalant.

[0046] In summary, Alcaligenes aquatilis can use calcium and magnesium ions in seawater to form stable organic-inorganic composite biodeposits with a calcite structure, which greatly reduces calcium and magnesium ions in seawater and avoids the occurrence of reverse osmosis seawater. The fouling problem of reverse osmosis membrane occurs during the desalination process. This method of reducing the content of calcium and magnesium ions in seawater is simple to operate, less in dosage, non-toxic and non-polluting, and has no special requirements for reverse osmosis seawater d...

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Abstract

The invention discloses a method for reducing the content of calcium and magnesium ions in seawater, a microbial scale inhibitor and its use. The method comprises the following steps: step 1: inoculate water-producing alkali bacteria into a liquid medium for expanded cultivation; step 2: Add the expanded cultured Alkaline bacteria to the seawater whose calcium and magnesium ion content is to be reduced, so that the density of the Alcalibacteria in the seawater is not less than 10 4 CFU / ml; step 3: culture seawater at 10-37°C for more than 24 hours; step 4: centrifuge or stand the seawater to remove sediment and obtain seawater with reduced calcium and magnesium ion content. The method can be used to prevent fouling of reverse osmosis membranes in the seawater desalination process. The microbial scale inhibitor provided by the present invention is the bacteria liquid of the alkali-producing bacteria in water. The method of the invention is simple to operate, non-toxic and pollution-free, has no special requirements on reverse osmosis seawater desalination equipment, can greatly reduce the cost of reverse osmosis desalination and post-treatment costs, and realizes high-efficiency green scale inhibition.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, in particular to a method for reducing the content of calcium and magnesium ions in seawater, a microbial scale inhibitor and its application. Background technique [0002] Without water, there is no life. In recent years, water resources have become increasingly scarce. Various factors such as climate change, drought and population increase contribute to water scarcity. Although the Earth's surface is made up of 70% water, only about 3% is fresh water. Furthermore, a significant portion of freshwater resources resides in ice sheets and glaciers, so only 1% of surface freshwater is available. Water use efficiency can be improved significantly if new or improved technologies are used to improve water use efficiency. In the case of seawater, it can be desalinated and removed of pollutants to turn it into water fit for human consumption or for productive uses such as agriculture and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F9/14C02F101/10
CPCC02F1/38C02F1/441C02F1/52C02F3/34C02F9/00C02F2001/007C02F2101/10C02F2103/08C02F2303/22Y02A20/131
Inventor 郭章伟刘涛郭娜赵倩玉
Owner SHANGHAI MARITIME UNIVERSITY
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