Sellami Mohamed, Zarai Zied, Khadhraoui Moncef, Jdidi Nidal, Leduc Roland, Ben Rebah Faouzi
Laboratoire de Biochimie et de Génie Enzymatique des Lipases, ENIS, Sfax, Tunisia E-mail:
Laboratoire 3E (Eau, Energie, Environnement), ENIS, Sfax, Tunisia.
Water Sci Technol. 2014;70(7):1175-81. doi: 10.2166/wst.2014.328.
Most industries in the world treat their wastewaters with a conventional coagulation-flocculation process using alum as coagulant, polyacrylamide (PAM) as flocculant and lime as coagulant aid. To reduce the use of chemical products in the process, experiments were conducted to substitute the PAM with cactus juice (CJ) as flocculant. From the obtained data, it was concluded that the substitution of PAM with CJ in the coagulation-flocculation process was very effective, compared with PAM. Depending on the wastewater's origin, the bioflocculant showed removal efficiencies of 83.3-88.7% for suspended solids (SS) and 59.1-69.1% for chemical oxygen demand (COD). Lime addition enhanced the coagulation-flocculation process in the presence of CJ similarly to the PAM with efficiencies greater than 90% for both SS and COD. The CJ powder's infrared (IR) spectrum showed the main functional groups present in PAM. It was concluded that CJ as a flocculant fits well with the definition of sustainability and it is appropriate for countries that have regions where cactuses grow naturally.
世界上大多数行业都采用传统的混凝-絮凝工艺处理废水，使用明矾作为混凝剂，聚丙烯酰胺（PAM）作为絮凝剂，石灰作为助凝剂。为了减少该工艺中化学产品的使用，进行了实验，用仙人掌汁（CJ）替代PAM作为絮凝剂。从获得的数据得出结论，在混凝-絮凝过程中用CJ替代PAM非常有效，与PAM相比，根据废水来源不同，这种生物絮凝剂对悬浮固体（SS）的去除效率为83.3-88.7%，对化学需氧量（COD）的去除效率为59.1-69.1%。添加石灰在CJ存在的情况下增强了混凝-絮凝过程，类似于在PAM存在的情况，对SS和COD的去除效率均大于90%。CJ粉末的红外（IR）光谱显示了PAM中存在的主要官能团。得出的结论是，CJ作为絮凝剂非常符合可持续性的定义，适用于有仙人掌自然生长地区的国家。
