絮凝沉淀-吸附两步法预处理松节油加工废水

采用絮凝沉淀-吸附两步法预处理松节油加工废水。筛选了絮凝剂和树脂类吸附材料,研究了吸附温度、时间、流量对吸附过程的影响,脱附剂及脱附液体积对解吸过程的影响。结果表明:常温下,pH值为7时,PAM为最佳的絮凝剂,废水中CODCr的去除率达36.1%;温度为30℃,pH值为7时,吸附流量为1 BV/h,聚氨酯为最佳的吸附材料,废水中CODCr的去除率可达35.7%;室温下依次以3 BV质量分数为6%的H2SO4溶液和2BV的水作为脱附剂,脱附流量为1 BV/h,脱附液体积为5 BV,脱附率可以达到92.3%;聚氨酯经过5次吸附-脱附后仍保持良好的吸附性能。

Pretreatment of turpentine processing wastewater by flocculation sedimentation-adsorption process

Flocculation sedimentation-adsorption process was used to pretreat turpentine processing wastewater.The research mainly focused on the screening of flocculant and resin,the effects of temperature,reaction time and flow rate on the adsorption,and the effects of desorbent and de-adsorbed liquid on desorption.The results showed that:PAM was the best flocculant,the removal rate of CODCr reached 36.1% at room temperature when the pH value was 7;polyurethane was the best adsorption material,the removal rate of CODCr reached 35.7% when the adsorption temperature was 30 ℃,the pH value was 7 and the adsorption flow rate was 1 BV/h;3 BV NaOH solution with mass fraction of 6% and 2 BV water showed a good desorption performance at room temperature when the desorption flow rate was 1 BV/h,and the volume of de-adsorbed liquid was 5 BV,the desorption rate could reach 92.3%.Polyurethane still kept high adsorptive capability after 5 times of adsorption-desorption cycles.