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Biosynthesis of obligate adsorbent and its usage in adsorbing to eliminate As and Cr from water

A technology of microorganisms and deionized water, applied in the field of environmental engineering, can solve the problem that the adsorption capacity and selective adsorption capacity cannot be combined, and achieve the effect of small particles, large specific surface area and mild reaction

Active Publication Date: 2006-05-17
南京贝克特环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This synthetic method overcomes the previous use of H 2 o 2 or KMnO 4 As a chemical oxidant, the product obtained after synthesis avoids the problem that the adsorption capacity and selective adsorption capacity of other adsorbents cannot be combined.

Method used

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  • Biosynthesis of obligate adsorbent and its usage in adsorbing to eliminate As and Cr from water
  • Biosynthesis of obligate adsorbent and its usage in adsorbing to eliminate As and Cr from water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The biosynthesis of embodiment 1Schwertmannite:

[0030] Add 6.95kg FeSO to the reactor 4 ·7H 2 O and 250L deionized water, stirring to dissolve the iron salt and adjusting the pH to 2.5 with sulfuric acid, inoculated with Thiobacillus ferrooxidans LX 5 ), so that its number reaches 10 7 ~10 8 per ml, under normal temperature and pressure (28±2°C and one standard atmospheric pressure), ventilate and stir for 1-3 days. The precipitate was collected by filtration, washed with deionized water acidified with sulfuric acid (pH1.0-2.5) for 2-3 times, and then rinsed with deionized water for 2-3 times until there was no SO in the filtered filtrate. 4 2- until. Bake at 55-80° C. for 2-3 hours to obtain 1.29 kg of dry product (the product is reddish-brown amorphous solid particles), with a yield of 54%.

[0031] The present invention relates to the microorganisms used to catalyze the oxidation synthesis of Schwertmannite is Thiobacillus ferrooxidans LX 5 ), which is a st...

Embodiment 2

[0033] Example 2 Schwertmannite Adsorption Removal of Cr(VI) in Wastewater

[0034] (1) Operation steps: add the adsorbent Schwertmannite to 5-1000mgCr(VI) / L wastewater according to 0.5% of the treated water, and use 0.2-1.0mol / L dilute HNO 3 or NaOH to adjust the pH value of the above-mentioned Cr(VI) wastewater containing adsorbent Schwertmannite to 7.0, oscillate (180r / min) or stir at constant temperature and pressure (28±2°C and 1 standard atmospheric pressure) or stir for 3h, take a sample and centrifuge, filter, and measure Filtrate pH value and Cr (VI) concentration.

[0035] (2) Analysis of results: The pH value was measured with a precision digital pH meter [PHS-2TC (0.01)], and the Cr(VI) was measured with a diphenylcarbazide colorimetric method. According to the change of Cr(VI) concentration in the solution before and after the experiment, the removal rate and maximum adsorption capacity of Cr(VI) were calculated. After analysis and calculation, the maximum capaci...

Embodiment 3

[0037] Example 3 Schwertmannite adsorption removes Cr(VI) in wastewater where multiple ions coexist

[0038] (1) The influence of coexisting heavy metal ions on the adsorption and removal of Cr(VI):

[0039] Add the adsorbent Schwertmannite to the Zn containing 50mg / L according to 0.5% of the treated water 2+ 、Cu 2+ 、Cd 2+ And in electroplating wastewater with a concentration of 10-200mg / L Cr(VI), the main anion is SO 4 2- . Use 0.2~1.0mol / L dilute HNO 3 or NaOH to adjust the pH value of the wastewater containing the adsorbent Schwertmannite to 5.0, oscillate (rotate at 180r / min) or stir for 3h at constant temperature and pressure (28±2°C and 1 standard atmospheric pressure), sample and centrifugally filter, and use PE3100 atomic absorption spectrometry Photometric determination of Zn 2+ 、Cu 2+ 、Cd 2+ The Cr(VI) content was determined by the diphenylcarbazide colorimetric method, and the adsorption removal rate and adsorption amount of heavy metals were calculated.

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Abstract

The present invention provides the biosynthesis of Schwertmannite as high efficiency adsorbent and its usage in adsorbing to eliminate Cr(VI) and As from waste water and underground water. Schwertmannite is prepared with ferrous sulfate as reactant, deionized water as reaction medium and Thiobacillus ferrooxidans LX5 as catalytic oxidant, and through stirring for 1-3 days, filtering to collect precipitate, washing with sulfuric acid acidified deionized water, washing with deionized water and stoving. Schwertmannite is added into water to be treated in the amount of 0.5 wt% or 0.02 wt%, dilute nitric acid is added into Cr(VI) containing system to regulate the pH value to 5.0-7.0 or sodium hydroxide is added into As containing system to regulate the pH value to 6.0-10.0, and the system is stirred for 3 hr and filtered to eliminate Cr(VI) and As. Schwertmannite has maximum adsorption amount on Cr(VI) and As of 55 mg / g and 65 mg / g separately.

Description

1. Technical field [0001] The invention relates to biosynthesis of ferric hydroxysulfate (Schwertmannite) and a method for adsorbing and removing heavy metal chromium and metalloid arsenic in water, belonging to the technical field of environmental engineering. 2. Technical Background [0002] A significant difference between toxic heavy metals and organic pollutants is their non-degradability, and their potential toxicity mainly depends on the chemical form. Chromium has a wide range of industrial uses (such as tanning, electroplating, metal polishing, alloy industry, and wood corrosion inhibitor, etc.), and irregular operations have caused a large amount of Cr to enter the ecological environment through wastewater, as well as As pollution, the main source of which is Used in non-ferrous metal mines and common pesticide or fertilizer factories. In nature, Cr and As mainly exist in two forms of Cr(III) and Cr(VI) (the latter is 100 times more toxic than the former) and As(I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C02F1/28C02F1/58C12P1/04
Inventor 周立祥陈福星
Owner 南京贝克特环保科技有限公司
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