The effect of some variables on the removal of synthetic bentonite suspension in water by electrocoagulation using turbidity measurcmcnts

摘要

Electrocoagulation can be considered as a simple and an efficient method for treating both wastewater and water.In this work,a synthetic bentonite suspension water was treated using this technique to reduce turbidity caused by solid particles pollutants.This process was carried out in a batch glass reactor of 1000 ml operated with aluminium electrodes with and without agitation.The removal efficiency as a turbidity removal procedure has been examined using bentonite clay as a turbidity source.The effects of some parameters such as contact time,and electrolyte concentration on the removal efficiency were investigated and compared.The mixing effect over the range(0-800 rpm)on the removal efficiency was also evaluated.The process was found to achieve excellent turbidity removal with mild mixing(550 rpm).In addition,the effect of using Ultrasonic as a mixing source has also been studied.The lowest residual turbidity was found to be 1.0 NTU for the samples with initial turbidities of 500 NTU.Similar final turbidity of 1.0 NTU was obtained after 25 min with initial turbidity of 200 NTU.This was obtained at a current of 750 mA,a contact time of 60 min,and a calculated dissolved aluminium concentration of 10 mg/l.