Method for removing silicon dioxide in water

A silicon dioxide and aluminum hydroxide technology, which is applied in the fields of chemical instruments and methods, water pollutants, water/sewage treatment, etc. Unsatisfactory silicon oxide removal effect and other problems, to achieve good industrial application prospects, improve recycling application value, and remove silicon dioxide thoroughly

Pending Publication Date: 2018-08-24
CHENGDU FILTRASCALE TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, for this kind of wastewater treatment, there are no examples of resource utilization at home and abroad. The existing methods include coagulation, chemical flocculation, ion exchange membrane and other single removal methods.
Among them, the traditional chemical flocculation method is easy to cause secondary pollution, and cannot achieve the purpose of deep removal of silica. Ion exchange mem

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  • Method for removing silicon dioxide in water

Examples

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Example Embodiment

[0027] Example 1

[0028] Such as figure 1 As shown, the 0.5m 3 The reverse osmosis concentrated water is pretreated with alkali. The specific method is to add sodium hydroxide solution to the reverse osmosis concentrated water, and control the pH of the aqueous solution after adding alkali to be 8-10, and then lift it to the electro-flocculation reactor by a pump for electrolysis. , The area of ​​a single piece is 100cm 2 The five groups of cathode and anode plates are inserted into the wastewater tank to be treated together, keeping the anode and cathode facing each other, and controlling the distance between each group of cathode and anode plates as 10mm, passing 48V / 29A current, electrolysis reaction for 10min , And then enter the air flotation device to separate suspended solids, and control the aeration flow rate of the air flotation device to 30m 3 / h. Finally, the aqueous solution treated by the air flotation device enters the membrane filtration system for deep filtratio...

Example Embodiment

[0033] Example 2

[0034] Take 1m of wastewater from the catalyst plant of a chemical enterprise 3 For alkali pretreatment, the specific method is to add calcium hydroxide solution to the wastewater, and control the pH of the aqueous solution after alkali addition to 10-12, and then lift it to the electro-flocculation reactor by a pump for electrolytic reaction. 100cm 2 The five groups of anode and cathode plates are inserted into the waste water tank to be treated together, keeping the anode and cathode facing each other, and controlling the distance between each group of cathode and anode plates as 10mm, passing 50V / 35A current, electrolysis reaction for 12min , And then enter the air flotation device to separate the suspended matter, and control the aeration flow rate of the air flotation device to 45m 3 / h. Finally, the aqueous solution treated by the air flotation device enters the membrane filtration system for deep filtration at a flow rate of 5-7m / h, and then effluent.

[...

Example Embodiment

[0039] Example 3

[0040] Take 1.5m of wastewater from a catalyst plant of a chemical enterprise 3 , Carry out alkali pretreatment, specifically add calcium hydroxide to the wastewater, and control the pH of the aqueous solution after alkali addition to 12-14, and then lift it into the electro-flocculation reactor by a pump for electrolytic reaction, with a single sheet area of ​​100cm 2 The five groups of anode and cathode plates are inserted into the waste water tank to be treated together, keeping the anode and cathode facing each other, and controlling the distance between each group of cathode and anode plates to be 10mm, passing 60V / 40A current and electrolysis reaction for 30min , And then enter the air flotation device to separate the suspended matter, and control the aeration flow rate of the air flotation device to 30-40m 3 / h. Finally, the aqueous solution treated by the air flotation device enters the membrane filtration system for deep filtration at a flow rate of 7-9...

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Abstract

The invention discloses a method for removing silicon dioxide in water. The method mainly comprises the following steps: (1) adding alkali for pretreatment to colloidize silicon dioxide, calcium and magnesium impurities in water; (2) electro-flocculation reaction precipitation: using an aluminum plate, an iron plate or an aluminum-iron mixed plate as a positive plate for electrolysis to generate an aluminum hydroxide or ferric hydroxide flocculant, after adsorption and alkali treatment, forming silica and calcium, and the magnesium impurities colloid particles, and performing co-deposition; 3)air flotation and impurity removal: floating waste water processed in the step 2) to remove impurities, and removing silica particles and other impurities which are difficult to precipitate in the water; and 4) membrane filtration: filtering the waste water processed by the step 3) by a membrane filtration apparatus, and realizing deep filtering treatment on the silica impurities in water. The whole process removes silicon dioxide thoroughly and maturely, and the process design is reasonable and coherent, also effectively removes calcium and magnesium impurities in the water, improves the quality of the processed clear water, and improves the recovery and application value of the processed water, has strong resistance to shock loading, and has good industrial application prospects.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a method for removing silica in water. Background technique [0002] With social progress, industrial development and population surge, the problem of environmental pollution is increasing, especially the pollution of water resources, which makes the fresh water resources available to human beings very small. Scientists predict that by 2025, two-thirds of the world's population will face severe water shortages, and may even be threatened by insufficient domestic water supply. In order to solve the shortage of water resources, all countries in the world have turned to the all-round and sustainable use of water resources for the overall strategy of water resources. How to improve the primary use efficiency of water and the reuse efficiency of water has become an important task in all walks of life. [0003] In industrial water, many industries are limited by silica in water, from t...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/10
CPCC02F9/00C02F1/00C02F1/24C02F2101/10C02F1/44C02F1/463
Inventor 欧群飞徐建洪
Owner CHENGDU FILTRASCALE TECH
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