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Method for restoring high-arsenic-content underground water through iron-modified biochar

A biochar and groundwater technology, applied in the treatment of polluted groundwater/leachate, chemical instruments and methods, water pollutants, etc., can solve the problems of membrane separation method prone to embolism, long biological method, polluted ion resin and other problems , to achieve the effect of improving curing ability and repairing effect, simple steps and improved removal efficiency

Inactive Publication Date: 2019-04-16
CHINA UNIV OF GEOSCIENCES (WUHAN)
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Problems solved by technology

[0003] At present, the common purification methods of high-arsenic groundwater include: redox method, precipitation-flocculation method, biological method, ion exchange method, lime softening method, membrane separation method, adsorption method, etc.; however, the above methods all have their own disadvantages: (1 ) redox method will produce toxic and carcinogenic by-products, (2) precipitation-flocculation method will produce unstable sludge, (3) biological method will take a long time, (4) ion exchange method will generate new waste (5) Lime softening method requires secondary treatment to adjust pH, (6) Membrane separation method is prone to embolism, requires regular maintenance, and the later operation cost is very high, (7) ) adsorption method requires regeneration and regular replacement, high operating costs

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  • Method for restoring high-arsenic-content underground water through iron-modified biochar
  • Method for restoring high-arsenic-content underground water through iron-modified biochar
  • Method for restoring high-arsenic-content underground water through iron-modified biochar

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Embodiment 1

[0048] An iron-modified biochar material for repairing high-arsenic groundwater, the preparation process is as follows:

[0049] S1, preparation of Fe(NO 3 ) 3 Modified biomass;

[0050] The steps are specifically:

[0051] S1.1, weigh 202g Fe(NO 3 ) 3 9H 2 O powder, dissolved in 1L of deionized water, stirred until fully dissolved, made into 0.5mol / L concentration of Fe(NO 3 ) 3 solution;

[0052] S1.2. Weigh the dried poplar biomass and cut it into cubes of the same size, with the side length of the cubes <2mm;

[0053] S1.3, the poplar biomass processed through step S1.2 and the Fe(NO 3 ) 3 The solution was mixed, and the added poplar biomass and Fe(NO 3 ) 3 The solution was mixed according to the mass ratio of poplar wood biomass and element Fe 5:1; then soaked for 48 hours, stirring irregularly during the soaking process to ensure full soaking and full absorption of Fe(NO 3 ) 3 poplar biomass in solution;

[0054] S1.4, drying the fully absorbed Fe(NO) obta...

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Abstract

The invention discloses a method for restoring high-arsenic-content underground water through iron-modified biochar, and belongs to the technical field of underground water restoring. The method comprises the following steps of S1, preparing iron-modified biomass; S2, conducting high-temperature thermal cracking on the iron-modified biomass to obtain an iron-modified biochar material; S3, puttingthe iron-modified biochar material obtained in S2 into the high-arsenic-content underground water to remove arsenic in the underground water; S4, separating the iron-modified biochar material to whicharsenic is fixed out of the water. By means of the method, through the combined effect of iron and biochar, firstly, trivalent arsenic in the high-arsenic-content underground water is oxidized into pentavalent arsenic with lower toxicity and poorer mobility, then arsenic in the underground water is removed through adsorption, complexation, coprecipitation and other modes, the removal efficiency is high, the procedure is simple, the work amount is small, and the method is convenient and easy to operate.

Description

technical field [0001] The invention relates to the technical field of groundwater restoration, in particular to a method for iron-modified biochar to restore high-arsenic groundwater. Background technique [0002] In the natural environment, arsenic mainly exists in the form of inorganic trivalent arsenic As(III) and pentavalent arsenic As(V); among them, the toxicity and mobility of trivalent arsenic As(III) is much greater than that of pentavalent arsenic As(V ). Over the years, groundwater with high concentration of arsenic has seriously threatened human health; chronic ingestion of arsenic-containing groundwater can cause endemic arsenic poisoning, causing skin, bladder, kidney cancer and vascular diseases. As the drinking water source for most of the population in my country, the quality of groundwater is related to the life and health of the residents who use it as a water source. Therefore, it is imminent to find an efficient and low-cost method for remediating high...

Claims

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Application Information

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IPC IPC(8): C02F1/28C02F1/52C02F1/72C02F101/10C02F103/06
CPCC02F1/281C02F1/283C02F1/5236C02F1/72C02F2101/103C02F2103/06
Inventor 刘鹏徐勇冯宇杨雁媛谢先军王焰新
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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