电絮凝法去除合并净化槽出水中的磷

Phosphorus Removal from Effluent of Johkaso by Electro-coagulation

对于下水道未普及地区合并净化槽去除氮化合物是有效的,但除磷效果并不理想。为了找出合并净化槽出水深度处理技术,研究采用电化学絮凝法处理合并净化槽出水,实验测定了电流密度、极板间距、通电时间以及电极材料等主要参数对合并净化槽出水中磷的去除率的影响,并确定了采用铝板为电极材料时的最佳除磷条件。结果表明:电流密度、极板间距和通电时间三个作用参数均能影响除磷效果,对合并净化槽出水中磷的去除率最高可以达到100%。在实验范围内,得到以铝板为极板去除合并净化槽出水中磷的最优操作条件为:极板间距2cm,电流密度4mA/cm2,通电时间10min左右。并且根据反应动力学实验证明了电絮凝除磷反应为一级反应,其反应速率常数k=0.2103。因此,电絮凝法能够有效地去除合并净化槽出水中的磷,并且具有实际的推广应用价值。

Effluent from a Johkaso, an on-site sewage treatment installation using Japanese Johkaso technology, is further treated by a bench-scale electrolytic cell with aluminum electrodes to remove phosphorus by means of electro-coagulation. Experiments were conducted to study the optimum condition under which 100% removal of phosphorus can be obtained, including current density, plate spacing and reaction time.