No abstract

The current study investigates the influence of the current density (CD) and electrodes gap (EG) on the removal of reactive red 120 dye (RR-120) from drinking water using electrocoagulation (EC) process. The influence of CD was studied by treating the dyed water at three different CDs (2, 4 and 6 mA/cm2). While the influence of EG was investigated at three EGs (5, 10, and 15 mm). The Results obtained showed that increasing the CD enhanced the removal of the dye. However, increasing the EG significantly decreased the dye removal efficiency. It was found that dye removal increased from 87% to 98%, as the CD increased from 2 to 6 mA/cm2, respectively. While increasing the EG from 5 to 15 mm decreased the dye removal from 96% to 80%, respectively.

Providing sufficient quantity of drinking water to the inhabitants of poor countries and rural areas is one of the difficult challenges for water treatment authorities, where it was reported, by the World Health Organisation (WHO), that nowadays there are more than 800 million people in the poor countries and rural areas do not have sufficient quantity of drinking water, which subjected those people for outbreaks of different water-related diseases. Water companies therefore seek to provide affordable and reliable methods of treatment in order to solve this life-threatening issue. In this vein, the goal of the current study is to develop and analyse the effectiveness of affordable eco-friendly coagulants that derived from the seed of Strychnos potatorum. The applicability of this new type of coagulants for water treatment has been validated by treating turbid water sample, which was synthesized using kaolinites. The experimental work was also focused on optimising the effects of coagulants dosage; retention period and pH of water on turbidity removal by applying the Response Surface Methodology (RSM). The final results demonstrated that the new eco-friendly coagulants are suitable for water treatment as they removed about 93% of kaolinite turbidity when the unit was operated at natural pH (7) for 70.0 min with a dosage of the new coagulants of 40.0 mg.L−1.