本研究的目的是研究先进的电凝聚(EC)工艺处理橄榄厂废水的性能。在EC过程中,铁板被用作电极,加入过氧二硫酸盐(PS)和过氧单硫酸盐(PMS)作为氧化剂。初始pH值的影响,电流密度,氧化剂剂量,优化了电解时间,通过EC-PS和EC-PMS工艺去除橄榄厂废水中的污染物。对照实验表明,向常规EC工艺中添加氧化剂可以提高污染物的去除效率。经典优化方法用于确定最佳条件,初始pH为4,电流密度为40mA/cm2,氧化剂剂量5g/L,和电解时间30分钟,这两个过程。在这些条件下,EC-PS和EC-PMS工艺实现了50.5%和48.9%的化学需氧量(COD),总酚93.8%和89.3%,87.7%和83%UV254,总悬浮固体去除率分别为74.5%和64.1%。进行了淬火实验以确定参与该过程的主要自由基种类。观察到羟基和硫酸根自由基参与这两个过程,但羟基自由基更具活性。EC工艺的比能耗计算为5.90kWh/kgCOD,EC-PS工艺4.95kWh/kgCOD,EC-PMS工艺的COD为5.20kWh/kg。发现EC-PS工艺的有机物去除/污泥比更高,为17.5g/L。尽管仅应用EC-PS和EC-PMS工艺不足以满足排放限制,已发现它们在橄榄厂废水处理中有效。实践要点:基于过氧二硫酸盐(PS)和过氧单硫酸盐(PMS)的高级电凝聚(EC)用于橄榄厂废水处理。50.5%化学需氧量(COD),93.8%TP,87.7%UV254,EC-PS实现了74.5%的TSS去除。48.9%COD,TP89.3%,83%UV254,通过EC-PMS获得64.1%的TSS去除量。这两个过程都涉及羟基和硫酸根。
The aim of this study is to investigate the performance of advanced electrocoagulation (EC) process for the treatment of olive mill wastewater. In EC process, iron plates were used as electrodes, and peroxydisulfate (PS) and peroxymonosulfate (PMS) were added as oxidants. The effects of the initial pH value, current density, oxidant dose, and electrolysis time were optimized for pollutant removal from olive mill wastewater by EC-PS and EC-PMS processes. Control experiments showed that addition of oxidants to the conventional EC process increased the pollutant removal efficiency. Classical optimization method was used to determine optimum conditions, which were initial pH 4, current density 40 mA/cm2 , oxidant dose 5 g/L, and electrolysis time 30 min for both processes. Under these conditions, EC-PS and EC-PMS processes achieved 50.5% and 48.9% chemical oxygen demand (COD), 93.8% and 89.3% total phenol, 87.7% and 83% UV254 , and 74.5% and 64.1% total suspended solid removal efficiencies. Quenching experiments were performed to determine the dominant radical species participating in the processes. It was observed that hydroxyl and sulfate radicals were involved in both processes but hydroxyl radicals were more active. Specific energy consumption was calculated as 5.90 kWh/kg COD for EC process, 4.95 kWh/kg COD for EC-PS process, and 5.20 kWh/kg COD for EC-PMS process. The organic removal/sludge ratio of EC-PS process was found to be higher with 17.5 g/L value. Although the application of EC-PS and EC-PMS processes alone is insufficient to meet the discharge limits, they have been found to be effective in olive mill wastewater treatment. PRACTITIONER POINTS: Peroxydisulfate (PS) and peroxymonosulfate (PMS)-based advanced electrocoagulation (EC) was used in olive mill wastewater treatment. 50.5% chemical oxygen demand (COD), 93.8% TP, 87.7% UV254 , and 74.5% TSS removals were achieved by EC-PS. 48.9% COD, 89.3% TP, 83% UV254 , and 64.1% TSS removals were obtained by EC-PMS. Hydroxyl and sulfate radicals were involved in both processes.