Abstract

Selection of biocarrier type is an essential element for successful bacterial cells immobilization. The present investigation aimed to evaluate a novel application of Cress and Chia seeds as biocarriers for immobilization of mixed bacterial cells. Being an environmentally friendly, non-polluting, inexpensive, and non-toxic substances makes them promising biocarriers. On the other hand, there is an increasing concern about contamination by surfactants, sodium dodecyl sulfate (SDS) is among the most commonly used surfactant. The Cress and Chia seeds were cross-linked with PVA to prepare two types of beads; CrE-PVA and ChE-PVA, respectively. The beads were utilized for the SDS biodegradation in four kinds of actual SDS-bearing wastewaters originated from; carwash garage (CWW), laundry facility (LWW), and household detergent industry (HWW), in addition to domestic wastewater (DWW). The results revealed that maximum efficiencies of SDS elimination in DWW, LWW, HWW, and CWW were 98.12, 94.32, 93.04, and 99.08%, respectively, using CrE-PVA and 99.04, 94.96, 94.71, and 99.27%, respectively using ChE-PVA. Finally, both types of beads were recycled for five times without losing their stability and efficiency for SDS biodegradation. Four kinetic models were adopted which were Blackman, Monod, Haldane, and Teissier. Results revealed that Teissier model well fitted the experimental data.

摘要

生物载体类型的选择是成功固定细菌细胞的重要因素。本研究旨在评估水芹和奇亚籽作为固定混合细菌细胞的生物载体的新应用。作为一种环境友好、无污染、廉价且无毒的物质，使其成为有前途的生物载体。另一方面，人们越来越担心表面活性剂的污染，十二烷基硫酸钠（SDS）是最常用的表面活性剂之一。将水芹和奇亚籽与 PVA 交联，制备两种类型的珠子；分别为 CrE-PVA 和 ChE-PVA。该珠子用于四种实际含有 SDS 的废水的 SDS 生物降解：洗车场 (CWW)、洗衣设施 (LWW) 和家用洗涤剂行业 (HWW)，以及生活废水 (DWW)。结果表明，使用 CrE-PVA 时 DWW、LWW、HWW 和 CWW 中 SDS 的最大消除效率分别为 98.12、94.32、93.04 和 99.08%，使用 ChE- 时分别为 99.04、94.96、94.71 和 99.27%。聚乙烯醇。最后，两种类型的珠子都循环使用了五次，而没有失去其稳定性和 SDS 生物降解效率。采用四种动力学模型：Blackman、Monod、Haldane 和 Teissier。结果表明Teissier模型与实验数据拟合良好。