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The combined use of magnetic field and iron-based complex in advanced treatment of pulp and paper wastewater

机译：磁场和铁基复合物在纸浆和造纸废水深度处理中的组合使用

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摘要

A new method for the advanced treatment of pulp and paper wastewater was presented by combining the magnetization with iron-based complex. The iron-based complex was prepared by ferric sulfate and polycarboxylic acid (PA), forming the Fe-PA complex. Effect of magnetization conditions (magnetic intensity and water velocity) on the physical and chemical properties of wastewater were measured. Results indicated that the conductivity and surface tension of wastewater have been greatly changed after the magnetization process, and the optimal magnetizing conditions were determined as magnetic intensity of 750 mT and water velocity of 4.4 m/s. Parameters of the flocs indicated that the properties of flocs formed by Fe-PA complex were enhanced by magnetization. What's more, the pretreatment of wastewater by magnetization accelerated the removal of COD_(Cr) and cut down about 7.7% of the Fe-PA complex dosage. In addition, the pilot scale test (1000m~3/d) was designed and the combined use of magnetization and Fe-PA complex demonstrated the excellent performance for the advanced treatment of pulp and paper wastewater, with the cost only 0.84 RMB/m~3 (0.13 US$/m~3) for the whole pilot scale system.
机译：磁化与铁基配合物相结合，提出了一种纸浆和造纸废水深度处理的新方法。通过硫酸铁和多元羧酸（PA）制备铁基络合物，形成Fe-PA络合物。测量了磁化条件（磁强度和水速度）对废水的物理和化学性质的影响。结果表明，磁化过程后废水的电导率和表面张力发生了很大变化，确定了最佳的磁化条件为磁强度为750 mT，水速为4.4 m / s。絮凝物的参数表明，Fe-PA络合物形成的絮凝物的磁化强度得到增强。此外，通过磁化预处理废水加速了COD_（Cr）的去除，并减少了约7.7％的Fe-PA复合物用量。另外，设计了中试规模试验（1000m〜3 / d），磁化和Fe-PA配合物的组合使用证明了对纸浆和造纸废水的深度处理具有优异的性能，成本仅为0.84元/ m〜 3（0.13美元/平方米〜3）。

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