A method for removing arsenic from calcium-rich and high-arsenic groundwater by using biochar
A groundwater and biochar technology, applied in the treatment of polluted groundwater/leachate, chemical instruments and methods, water pollutants, etc., can solve the problems of low efficiency, high operation cost, complicated operation, etc., and achieve lasting treatment effect. , The effect of reducing secondary pollution and simple operation
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Embodiment 1
[0036] In the present invention, the rice husks of the prepared biochar are all taken from an agricultural 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 30g of rice husk into the silicon carbide reactor and cover it (isolate oxygen), place it in a muffle furnace at 400°C for 1h 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 the obtained solid is again washed in the same way as above The step of washing 12h and filtering. The finally obtained so...
Embodiment 2
[0039] Take 100mL of calcium-rich, high-arsenic and alkaline groundwater (calcium ion concentration is 0.05mol / L, trivalent arsenic concentration is 7.5mg / L, pH=9.0), add 0.2g biochar, and place the reaction bottle in a water bath Medium seal (although a water bath is used, the water bath is only used to provide a sealed reaction vessel without heat treatment; the water temperature can be kept at the initial state temperature, such as 27 ° C), the stirring rate is 600r / min, continuous stirring, respectively Samples were taken at 0, 0.5, 1, 2, 3, 4, 6, 8, 12 and 24 hours of reaction, and the arsenic was analyzed by HPLC-AFS to obtain the removal efficiency of arsenic.
[0040] Such as Figure 5 Shown, the removal efficiency of arsenic can reach 80% within 24h.
Embodiment 3
[0042] In Example 2, when the groundwater pH=11.0 is selected, the removal efficiency of arsenic by biochar.
[0043] Such as Image 6 As shown, the removal efficiency of arsenic can reach 100% within 24 hours, and the removal effect of arsenic is enhanced with the increase of pH.
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