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Method for synchronously removing heavy metal and nitrate from drinking water and device thereof

A heavy metal and nitrate technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low hydrogen utilization rate and low hydrogen solubility, and achieve low ammonia nitrogen and organic carbon content, which is beneficial to ozone. The effect of rapid disinfection

Inactive Publication Date: 2012-04-18
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the solubility of hydrogen in water is small, and the utilization rate of hydrogen is low

Method used

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  • Method for synchronously removing heavy metal and nitrate from drinking water and device thereof
  • Method for synchronously removing heavy metal and nitrate from drinking water and device thereof
  • Method for synchronously removing heavy metal and nitrate from drinking water and device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029]The metal removal column 5 has a diameter of 10cm and a height of 100cm, and its filler layer is laid five times in the order of quartz sand and iron oxide layer, quartz sand layer, activated carbon and ferrous sulfide layer and quartz sand layer; Layer, quartz sand layer, activated carbon, ferrous sulfide layer and quartz sand layer have a volume ratio of 4:1:4:1; in the quartz sand and iron oxide layer, the volume ratio of quartz sand and iron oxide is 5:1; In the activated carbon and ferrous sulfide layer, the volume ratio of activated carbon to ferrous sulfide is 10:1. The particle size of quartz sand and iron oxide is <1mm, and the particle size of ferrous sulfide and activated carbon is 1-4mm.

[0030] The diameter of denitrification reaction column 6 is 15cm, high 1m, and the filler of its upper half is activated carbon and ferrous sulfide, and volume ratio is 10: 1; The filler of denitrification reaction column lower half is activated carbon and iron oxide, and v...

Embodiment 2

[0040] The difference from Example 1 is:

[0041] According to treatment 56mg NO 3 - -80% of the required carbon source in N / L Add formic acid (10mM) and acetic acid (1.5mM) in distribution tank 2, and the effluent from distribution tank 2 and distribution tank 3 will flow into the mixing tank at a ratio of 1:1. The pH of the post water was 4.0. Three kinds of raw water (as shown in Table 2) with nitrate content in the middle and high concentration range were treated sequentially, and other operating conditions were consistent with Example 1. The treatment results are shown in Table 2. For raw water with nitrate content in the range of 46-66mg N / L, the carbon source supply and treatment conditions are the same, but the treatment system can effectively remove NO 3 - , arsenic and cadmium, and NO in the effluent 2 - Compliant with TOC.

[0042] Table 2. Water quality changes before and after treatment of drinking water contaminated by heavy metals and nitrates

[0043] ...

Embodiment 3

[0045] The difference from Example 1 is:

[0046] According to treatment 28mg NO 3 - -80% of the required carbon source amount of N / L is added to the distribution tank 2 with 8mM formic acid, and the outlet water from the distribution tank 2 and the distribution tank 3 flows into the mixing tank at a ratio of 1:1, and the pH of the water after flowing into the mixing tank is 4.9. The three kinds of raw water (as shown in Table 3) with nitrate content in the middle and low concentration range were treated sequentially. The flow rate of the raw water passing through the heavy metal removal column and the denitrification reaction column was 3.6 L / h, and other operating conditions were consistent with those in Example 1. The treatment results are shown in Table 3. For raw water with nitrate content in the range of 18-38mg N / L, the carbon source supply and treatment conditions are the same, but the treatment system can effectively remove NO 3 - , arsenic and cadmium, and NO in ...

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Abstract

The invention relates to environmental protection, in particular to a method for synchronously removing heavy metal and nitrate from drinking water and a device thereof. The method comprises the following steps of: adding small molecular organic carbon mainly comprising formic acid and secondarily comprising acetic acid or ethanol into raw water to be treated to perform acidification and adjust the pH of the raw water to between 5 and 3.9, feeding the acidified raw water to a metal removal column under aerobic condition, and removing the heavy metal by using the filler in the metal removal column; feeding the heavy metal removed raw water to a denitrification reaction column, removing the nitrate from the raw water under synergetic effect of heterotrophic denitrification and autotrophic denitrification by using the small molecular organic carbon which is not superfluous during acidification as a carbon source and using the filler in the denitrification reaction column as an electron donor source, and removing residual substances from the raw water by aerobic circular filtration so as to obtain the heavy metal and nitrate removed drinking water. The method and the device can automatically adjust the relative action strength of the heterotrophic denitrification and the autotrophic denitrification, and effectively remove the nitrate from the raw water; and meanwhile, the discharged water is weak alkali, the concentration of sulfate radicals is not obviously raised, and the contents of heavy metal, nitrite, ammonia nitrogen and organic carbon do not exceed standards.

Description

technical field [0001] The invention relates to environmental protection, in particular to a method and device for synchronously removing heavy metals and nitrates in drinking water. Background technique [0002] Due to geological causes or mining activities, drinking water in some areas of China, especially underground drinking water, often contains heavy metals such as arsenic and cadmium that exceed the standard. In these areas, excessive nitrogen application in agricultural production, insufficient treatment of livestock and poultry breeding wastewater and urban domestic sewage will lead to serious excess of nitrate in underground drinking water. As a result, heavy metals and nitrates in drinking water exceed the standard, seriously endangering people's health. [0003] Activated carbon has a certain physical adsorption capacity for heavy metals. Iron-manganese sand and gravel containing iron oxides and manganese oxides can also adsorb and precipitate heavy metals such...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/20C02F101/16
CPCC02F1/66C02F3/06C02F1/78C02F1/28C02F9/00C02F2101/163C02F1/001C02F1/283C02F2101/20C02F3/305Y02W10/10
Inventor 黄斌史奕陈欣
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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