秸秆生物炭处理含砷废水的研究

Study on the Treatment of Arsenic-Containing Wastewater with Straw Biochar

摘要: 面对日益严重的水污染问题，本文以生物质秸秆为原材料对含砷废水进行处理。在300℃、400℃、500℃进行热解制备生物炭，探讨生物炭在含砷废水中的吸附机理。实验结果表明，在pH = 5时，生物炭对As (V)的去除率达到74.7%，随着pH的继续增大，去除效率逐渐变差；随着温度的不断上升，去除效率不断增大，在65℃的时候对As (V)的去除率达到69.7%。表明温度的变化和去除效率基本成正比；随着投加量的不断变大，去除率随之不断增大，BC400在投加量为1.5 g/L的条件下，去除率为96.3%。表明投加量的变大和吸附效率也是成正比。

Abstract: Facing the increasingly serious water pollution problem, this article uses biomass straw As (V) raw material to treat arsenic-containing wastewater and discusses the removal mechanism of arsenic in arsenic-containing wastewater with preparation of biochar by pyrolysis at 300˚C, 400˚C, 500˚C. The results show that the adsorption capacity of biochar to arsenic reaches the maximum at pH = 5 and the removal rate of As (V) by biochar reached 74.7%. As the pH continues to increase, the removal efficiency gradually deteriorates. As the temperature continues to rise, the removal efficiency continues to increase, and the removal rate of As (V) reaches 69.7% at 65˚C. That shows the temperature change is basically proportional to the removal efficiency. As the dosage increases, the removal rate increases accordingly. When the dosage of BC400 is 1.5g/L, the removal rate is 96.3%, indicating that the increase in dosage is directly proportional to the adsorption efficiency.