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Method for removing Cr(VI) in water

A technology for removing water and microorganisms, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low efficiency of direct reduction of Cr by microorganisms, harsh culture conditions, and complicated separation. Harsh, cheap, easy to domesticate effects

Inactive Publication Date: 2010-09-01
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) The reaction efficiency of microorganisms to directly reduce Cr(VI) is low;
[0009] (2) The microorganisms used are all special microorganisms, which need special domestication and isolation, and need to be cultivated under special conditions, the separation is complicated, and the cultivation conditions are harsh;
[0010] (3) Added Fe(OH) 3 Other chemical substances are prepared in the laboratory, and the price is relatively high;
[0011] (4) The iron ore used for direct removal of natural iron ore can only be used once

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]Obtain a certain amount of anaerobic digested sludge from the urban sewage treatment plant, after settling at room temperature for 1 hour, obtain 200ml of settled sediment from it, and pour it into a 2L three-necked flask. Add 2L of prepared nutrient solution to the flask, then add 10ml of K containing 2mg of Cr(VI) 2 Cr 2 o 7 The solution was blown off with nitrogen gas and cultured statically. After 5 days, the Cr(VI) concentration was 0.512 mg / L. Pour out the supernatant, replace it with a nutrient solution and a Cr(VI)-containing solution equal to the volume of the poured out, blow off with nitrogen, and then culture it statically. After 5 days, the Cr(VI) concentration was 0.052 mg / L.

[0040] The above mixed solution was left to stand for 10 min, the supernatant was poured out, and the sludge was collected in a 2L flask. Add 2L of prepared nutrient solution to it, and then add 10ml of K containing 12mg of Cr(VI) 2 Cr 2 o 7 The solution was blown off with ni...

Embodiment 2

[0047] Obtain a certain amount of anaerobic digested sludge from the urban sewage treatment plant, after settling at room temperature for 2 hours, obtain 200ml of settled sediment from it, and pour it into a 5L plastic bucket. Add 3L of prepared nutrient solution to the bucket, and then add 10ml of K containing 2mg of Cr(VI) 2 Cr 2 o 7 The solution was blown off with nitrogen gas and cultured statically. After 3 days, pour out the supernatant, replace it with a nutrient solution and a Cr(VI)-containing solution equal to the volume of the poured out, blow off with nitrogen, and then culture it statically. After 3 days, repeat the above operation. After another 3 days, the supernatant was poured out, replaced with a nutrient solution equal in volume to that poured out, and then 10ml of K containing 4mg of Cr(VI) was added. 2 Cr 2 o 7 The solution was blown off with nitrogen gas and cultured statically.

[0048] After that, every 6 days, the amount of Cr(VI) added was incr...

Embodiment 3

[0050] Obtain a certain amount of anaerobic digested sludge from the urban sewage treatment plant, after settling at room temperature for 3 hours, obtain 200ml of settled sediment from it, and pour it into a 5L plastic bucket. Add 5L of prepared nutrient solution to the flask, then add 10ml of K containing 10mg of Cr(VI) 2 Cr 2 o 7 The solution was blown off with nitrogen gas and cultured statically. After 3 days, pour out the supernatant, replace it with a nutrient solution and a Cr(VI)-containing solution equal to the volume of the poured out, blow off with nitrogen, and then culture it statically. After 3 days, repeat the above operation. After another 3 days, the supernatant was poured out, replaced with a nutrient solution equal in volume to that poured out, and then 10ml of K containing 15mg of Cr(VI) was added. 2 Cr 2 o 7 The solution was blown off with nitrogen gas and cultured statically.

[0051] After that, every 9 days, the amount of Cr(VI) added was increas...

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Abstract

The invention relates to a method for removing Cr (VI) in the water. Existing microbe removing method and iron ore removing method both have shortages. The method comprises the domestication, treatment and application of the microbe. Firstly, microbe nutrient solution is added in the sewage which is obtained from urban sewage treatment plant and has settled down the anaerobic digesting sludge to form mixed solution; secondly, the solution containing Cr (VI) is added in the mixed solution to carry out the domestication to the microbe. Thirdly, crushed natural iron ore is added after the clear solution in the mixed solution is spilled out, and the micro nutrient solution is added as reactant in the waste water containing Cr (VI). In the invention, iron ions can greatly quicken the removing speed of the microbe to the Cr (VI), and can be recycled as Cr (VI) microbe reductive catalyst. The method has quick reaction of integrative system and low price, and is suitable for effective and quick removing of the Cr (VI) in the waste water containing Cr (VI) and underground water.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for jointly removing Cr(VI) in water by using natural iron ore and microorganisms. Background technique [0002] Various pollutants discharged in the process of production and life enter the environment through various channels, seriously polluting the atmosphere, soil, groundwater and surface water systems, and seriously threatening the healthy life of human beings. Among them, Cr(VI) is one of the priority pollutants ubiquitous in groundwater, soil and surface water, especially in electroplating and tanning industry wastewater containing a large amount of Cr(VI). [0003] Cr(VI) and total chromium are the first category of pollutants in the "Integrated Wastewater Discharge Standard" (GB8978-1996), and their maximum allowable discharge mass concentrations are 0.5mg / L and 1.5mg / L respectively. Cr(VI) is a carcinogen announced by the International Ant...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/62C02F3/28C02F101/22
Inventor 王倩徐新华赵方林刘之浩许吉男
Owner ZHEJIANG UNIV
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