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Purification and removal of arsenic by biological filter column based on adding iron and manganese salts to generate adsorbent in situ

An in-situ generation and biological filtration technology, applied in chemical instruments and methods, biological water/sewage treatment, water pollutants, etc., can solve the problems of exhausted adsorption capacity, inconvenient replacement process, etc., and achieve cost reduction and simple method. , the effect of good economic benefits

Active Publication Date: 2019-08-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And there are also some commercial adsorbents based on metal oxides, but such finished adsorbents are easy to run out of adsorption capacity, and the replacement process is very inconvenient

Method used

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  • Purification and removal of arsenic by biological filter column based on adding iron and manganese salts to generate adsorbent in situ

Examples

Experimental program
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Embodiment 1

[0031] Embodiment 1: Fill the filter column with quartz sand filter material, the filter material is 1.0m thick, and the particle size distribution is 0.8-1.2mm. The supporting layer is made of pebbles with a thickness of 0.5m and a particle size distribution of 1.2-0.32mm. The mature filter material with a large number of dominant strains of iron, manganese and arsenic oxidizing bacteria attached to the surface of the biological filter for removing iron and manganese is used to insert into the new filter column, and the volume ratio of the mature filter material accounts for 15%. The measured raw water quality conditions are as follows: arsenic concentration 125ug / L (including trivalent arsenic 96ug / L, pentavalent arsenic 29ug / L), pH: 6.8, dissolved oxygen: 8.0mg / L, temperature: 20°C, total hardness (CaCO 3 Count): 200mg / L. Inorganic anions such as phosphate and silicate are negligible. As the iron and manganese salts, ferrous sulfate and manganese sulfate were used. In th...

Embodiment 2

[0032]Embodiment 2: Manganese sand filter material is filled in the filter column, the filter material is 1.2m thick, and the particle size distribution is 0.8-1.2mm. The supporting layer is made of gravel with a thickness of 0.3m and a particle size distribution of 1.2-0.3mm. The mature filter material with a large amount of dominant strains of iron, manganese and arsenic oxidizing bacteria attached to the surface of the biological filter for removing iron and manganese is used to insert into the new filter column, and the volume ratio of the mature filter material accounts for 10%. The measured raw water quality conditions are as follows: arsenic concentration 278ug / L (including trivalent arsenic 65ug / L, pentavalent arsenic 213ug / L), pH: 7.2, dissolved oxygen: 7.5mg / L, temperature: 19°C, total hardness (CaCO 3 Total): 260mg / L, phosphate: 0.3mg / L, silicate: 1.5mg / L, no other impurities. Ferrous chloride and manganese sulfate were used as iron and manganese salts, respectivel...

Embodiment 3

[0033] Embodiment 3: Anthracite filter material is filled in the filter column, the filter material is 1.1 m thick, and the particle size distribution is 0.8-1.2 mm. The supporting layer is made of pebbles with a thickness of 0.4m and a particle size distribution of 1.2-0.3mm. Inoculate by soaking. With a concentration of 4.0 x 10 6 The CFU / ml iron manganese arsenic oxidizing bacteria mixed bacteria solution is soaked in a new biofiltration column for 24 hours, and then enters water. The measured raw water quality conditions are as follows: arsenic concentration 458ug / L (including trivalent arsenic 426ug / L, pentavalent arsenic 32ug / L), pH: 7.8, dissolved oxygen: 8.3mg / L, temperature: 23°C, total hardness (CaCO 3 Count): 250mg / L. Phosphate: 1mg / L, Silicate: 0.5mg / L. As the iron and manganese salts, ferrous sulfate and manganese chloride were used. In the early stage of cultivation, the pumping speed of the peristaltic pump was used to adjust the dosage of the reagents, and...

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Abstract

A biological filtering column purifying and arsenic-removing method based on an adsorbent generated in situ by adding iron-manganese salt is suitable for removing arsenic in underground water and overground water low in iron-manganese concentration. Arsenic-containing water is purified by means of adding a proper amount of the iron-manganese salt into a filtering column and culturing a biological filtering layer. Culturing of the biological filtering layer needs time, so that the method is mainly divided into two stages including a biological filtering column culture early stage and a biological filtering column mature stage; the early stage mainly includes that by adding excessive ferrite, a self-catalyzed oxidation intermediate product of the ferrite can partly pre-oxidize trivalent arsenic, and arsenic in raw water is adsorbed by iron oxide generated in situ to realize up-to-standard removal of arsenic; in the mature stage, oxidation of trivalent arsenic is realized by mainly utilizing oxidation effect of biologically-oxidized manganese oxide and arsenic oxidation bacteria, and adding amount of iron salt is lowered at the moment, so that the objective of saving chemical agents can be achieved, and efficient removal of arsenic can be realized.

Description

[0001] Technical field: [0002] The invention relates to a method for removing arsenic, in particular to a method for removing arsenic by purifying a biological filter column based on adding iron and manganese salts to generate an adsorbent in situ. [0003] Background technique: [0004] Arsenic is a typical carcinogen. Long-term excessive intake can lead to acute and chronic poisoning and even cancer, causing serious damage to human health. Under certain hydrogeological conditions, arsenic-containing minerals undergo geochemical processes such as reductive dissolution, desorption, and release, which lead to varying degrees of arsenic pollution in groundwater in many areas. Arsenic pollution in groundwater has received more and more attention in recent years, and many regions in my country, such as Inner Mongolia, Xinjiang, Shanxi, and Taiwan, are also facing serious problems of arsenic pollution in groundwater. In my country's "Drinking Water Sanitation Standard" GB5749-200...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30C02F9/14
CPCB01J20/0222B01J20/0229C02F1/281C02F1/725C02F3/34C02F9/00C02F2101/103C02F2201/007C02F2301/08
Inventor 曾辉平尹灿李冬张杰
Owner BEIJING UNIV OF TECH