Use of chitosan in the remediation of water from purification of biodiesel

Abstract This article evaluates the efficiency of the degradation of pollutants present in water from the purification of biodiesel, characterized by high content of chemical oxygen demand (COD), suspended solids (SS), oils and greases, methanol, soap, and glycerol. The treatment process proposed was of the photo-Fenton type using iron immobilized in chitosan. The characterization of the material was performed according to degree of deacetylation (DD) and thermal stability (TG). The results revealed a DD of 66.5% and that the material undergoes decomposition in three temperature stages: 100; 150-350 and above 350 °C. The evaluated parameters were: COD, suspended solids, oils and greases, color and turbidity. After a 180-minutes long treatment, the removal percentage was 94.52, 70, 55, and 60% respectively. These results indicate that the photo-Fenton process can be an alternative for pre-treatment this type of effluent.

摘要 本研究评估了生物柴油纯化废水的污染物降解效能，该废水以高化学需氧量（COD）、悬浮物（SS）、油脂、甲醇、皂类及甘油为典型污染物特征。本研究采用的处理工艺为负载于壳聚糖的铁基光芬顿（photo-Fenton）工艺。对该负载材料的表征采用脱乙酰度（DD）与热稳定性（TG）两项指标开展。结果显示，该材料的脱乙酰度为66.5%，且其热分解过程分为三个温度阶段：100℃、150~350℃以及350℃以上。本次评估的水质参数包括：化学需氧量、悬浮物、油脂、色度与浊度。经过180分钟的处理后，各对应参数的去除率依次为94.52%、70%、55%与60%。上述结果表明，光芬顿（photo-Fenton）工艺可作为该类废水预处理的可行替代方案。