Method of using biochar for oxidizing trivalent arsenic in underground water
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A trivalent arsenic and groundwater technology, applied in chemical instruments and methods, oxidized water/sewage treatment, contaminated groundwater/leachate treatment, etc., can solve problems such as high operating cost, complicated operation, and secondary pollution, and achieve Difficult to manage effects
Active Publication Date: 2019-09-06
HUAZHONG UNIV OF SCI & TECH
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[0005] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide a method for utilizing biochar to oxidize trivalent arsenic in groundwater, wherein through the cooperation of biochar and oxygen-containing gas, the heat of the key biochar is Compared with the existing technology, it can effectively solve the problems of easily causing secondary pollution, high operating cost, complicated operation, or the need to add exogenous minerals, and low efficiency. The present invention utilizes biochar in-situ oxidation As in groundwater III method for As in groundwater III Oxidation provides a cost-effective, green and environmentally friendly treatment method
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Embodiment 1
[0036] In the present invention, the rice husks of the prepared biochar are all taken from a breeding base in Hubei. The retrieved rice husks were washed several times with deionized water to remove impurities, and then placed in an electric blast drying oven for 12 hours (80°C). And seal it in a ziplock bag for later use. Then weigh 40g of rice husk into the silicon carbide reactor and cover it (isolation of oxygen), place it in a muffle furnace at 400°C for 1 hour with limited oxygen pyrolysis (no gas is introduced during the pyrolysis process), wait to cool to room temperature, The biochar was washed twice with deionized water.
[0037] The specific cleaning procedure is as follows: put in a 2L beaker, add 2L of deionized water, put it on a magnetic stirrer and stir at a speed of 600r / min for 12h, filter (medium-speed filter paper, 30-50μm), and put the obtained solid into 2L In the beaker, add 2L deionized water, stir at the same speed for 12h, and filter. The finally o...
Embodiment 2
[0039] The biochar raw material in Example 1 is corn stalks.
Embodiment 3
[0041] Measure 250mL containing As III Groundwater (0.01mM concentration, 750μg L –1 , pH=4) in a brown glass bottle, add 0.5g of biochar (prepared at 400°C) to it, pass 250mL of air into the reactor and seal it and place it on a magnetic stirrer at 700r min -1 The reaction was stirred at a certain speed, samples were taken at preset time points (0, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 12 and 24h), and As III for analysis.
[0042] Such as Figure 6 As shown in (b), when the pH of the groundwater is 4.0, when the treated biochar is added and air is introduced at the same time, the As III The oxidation rate can reach 87.6%.
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Abstract
The invention belongs to the field of remediation of underground water and discloses a method of using biochar for oxidizing trivalent arsenic in underground water. The method includes the steps of adding the biochar into the underground water containing the trivalent arsenic (AsIII), introducing oxygen-containing gas at the same time, and carrying out stirring for a reaction for 1-3 days so thatthe AsIII in the underground water can be oxidized into pentavalent arsenic (AsV), wherein the biochar is obtained by adopting agricultural and forestry waste as a raw material for pyrolysis for 30-150 minutes at 400-500 DEG C under an oxygen isolation condition and then washing an obtained solid with deionized water. Through the cooperative effect of the biochar and the oxygen-containing gas andthe improvement of a pyrolysis preparation process and the like of the key biochar, the problems can be effectively solved that secondary pollution is likely to be caused, the operation cost is high,the operation is complicated, external minerals need to be added, and the efficiency is low. According to the method of using the biochar for oxidizing the AsIII in the underground water in site, an economical, efficient and environment-friendly treatment method is provided for oxidizing the AsIII in the underground water.
Description
technical field [0001] The invention belongs to the field of groundwater restoration, and in particular relates to the treatment of arsenic pollution in groundwater, and more specifically relates to a method for oxidizing trivalent arsenic in groundwater by utilizing biochar. Background technique [0002] Arsenic in high-arsenic groundwater usually comes from the release of biogeochemical processes such as arsenic-containing minerals (or sediments) and the discharge of human mining and smelting arsenic-containing minerals. Arsenic is the first class of carcinogen identified by the International Agency for Research on Cancer. Long-term drinking of arsenic-containing groundwater will cause serious damage to the skin, nerves, hematopoietic and immune systems. Nearly 100 million people in the world live in high-arsenic groundwater hazard areas, according to my country's groundwater standards (>10μg L –1 ), at least 14.7 million people are affected by arsenic-contaminated gro...
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