de Souza Maísa Tatiane Ferreira, Ambrosio Elizangela, de Almeida Cibele Andrade, de Souza Freitas Thábata Karoliny Formicoli, Santos Lídia Brizola, de Cinque Almeida Vitor, Garcia Juliana Carla
Departamento de Pós-graduação em Química, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá, Brazil.
Environ Monit Assess. 2014 Aug;186(8):5261-71. doi: 10.1007/s10661-014-3775-9. Epub 2014 May 2.
The goal of this study was to investigate the activity of the coagulant extracted from the cactus Opuntia ficus-indica (OFI) in the process of coagulation/flocculation of textile effluents. Preliminary tests of a kaolinite suspension achieved maximum turbidity removal of 95 % using an NaCl extraction solution. Optimization assays were conducted with actual effluents using the response surface methodology (RSM) based on the Box-Behnken experimental design. The responses of the variables FeCl3, dosage, cactus dosage, and pH in the removal of COD and turbidity from both effluents were investigated. The optimum conditions determined for jeans washing laundry effluent were the following: FeCl3 160 mg L(-1), cactus dosage 2.60 mg L(-1), and pH 5.0. For the fabric dyeing effluent, the optimum conditions were the following: FeCl3 640 mg L(-1), cactus dosage 160 mg L(-1), and pH 6.0. Investigation of the effects of the storage time and temperature of the cactus O. ficus-indica showed that coagulation efficiency was not significantly affected for storage at room temperature for up to 4 days.
本研究的目的是调查从仙人掌（仙人掌属）中提取的凝结剂在纺织废水混凝/絮凝过程中的活性。使用NaCl提取溶液对高岭土悬浮液进行的初步测试实现了95%的最大浊度去除率。基于Box-Behnken实验设计，采用响应面法（RSM）对实际废水进行了优化分析。研究了FeCl3、用量、仙人掌用量和pH值等变量对两种废水化学需氧量（COD）和浊度去除率的影响。确定的牛仔布洗涤废水的最佳条件如下：FeCl3 160 mg L(-1)、仙人掌用量2.60 mg L(-1)、pH值5.0。对于织物染色废水，最佳条件如下：FeCl3 640 mg L(-1)、仙人掌用量160 mg L(-1)、pH值6.0。对仙人掌的储存时间和温度影响的研究表明，在室温下储存长达4天，凝结效率没有受到显著影响。
