响应面法优化葵花秸秆酯化改性处理含油废水

Optimization of Sunflower Straw Esterification Modification for Oily Wastewater Treatment by Response Surface Method

石化工业生产过程中产生的大量含油废水,严重威胁着人类的生存和发展。以葵花秸秆为原料,采用丙酮-环己烷、体积分数10%的氨水、甲苯-乙醇预处理方法考察葵花秸秆的对油品吸附特性的影响,采用单因素及响应面法优化甲苯-乙醇预处理后的葵花秸秆酯化改性条件。研究结果表明,甲苯-乙醇预处理后的秸秆吸油性较好,吸油率提高了5.04 g/g,保油率也有显著提高。葵花秸秆酯化改性的最优条件为液固比20 mL/g、反应时间8 h、温度90℃,在吸油过程中,对油品的影响大小顺序为反应时间、反应温度、液固比,在最优条件下吸油率为21.82 g/g,相比原始葵花秸秆材料,吸油率得到明显提高。葵花秸秆酯化改性后,秸秆材料的稳定性降低,表面积和粗糙度增大,吸附位点增加,为葵花秸秆对含油废水的吸附提供了条件。本研究可为葵花秸秆的以废治废资源化利用和含油废水的处理提供一种方法。

The large amount of oily wastewater generated during the production of petrochemical industries is a serious threat to the survival and development of human.The effects of the pretreatment of sunflower straw with acetone-cyclohexane,10%ammonia,and toluene-ethanol on oil adsorption were investigated.The single factor and response surface method were used to optimize the esterification modification conditions of sunflower straw after toluene-ethanol pretreatment.The results show that the straw pretreated with toluene-ethanol has the best oil absorption,the oil absorption rate increased by 5.04 g/g,and the oil retention rate also increases significantly.The optimum modification conditions for the esterification of sunflower straw were a liquid-to-solid ratio of 20 mL/g,a reaction time of 8 h,and a temperature of 90°C.During the oil absorption process,the magnitude of the effect on the oil was in the order of reaction time,reaction temperature,and liquid-to-solid ratio,and the oil absorption rate was 21.82 g/g under the optimum conditions,which was significantly improved compared to the original sunflower straw material.After the esterification modification of sunflower straw,the stability of the straw material is reduced,the surface area and roughness are increased,and the adsorption sites are increased,providing conditions for the adsorption of sunflower straw on oily wastewater.This study can provide a method for the resource utilization of sunflower straw and the treatment of oily wastewater.