Journal
SEPARATIONS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/separations10010061
Keywords
restaurant wastewater; oil and grease; electrocoagulation; ultrasound; passive film; response surface methodology; environmental pollution
Categories
Ask authors/readers for more resources
This study evaluated the efficiency of EC combined with US methods for O&G removal in restaurant wastewater, determined the optimum condition for COD degradation using EC treatment, and observed the morphological surface of the aluminium electrode before and after EC treatment. The results showed that the US-EC combined technique is highly recommended for O&G removal from the food industry's wastewater.
Restaurant wastewater contains a high concentration of O&G, up to 3434 mg/L. This study aims to (a) assess the efficiency of EC combined with US methods for O&G removal in restaurant wastewater, (b) identify the optimum condition for COD degradation using EC treatment via response surface methodology (RSM), and (c) determine the morphological surface of the aluminium (Al) electrode before and after EC treatment. The wastewater samples were collected from the Lembaran cafeteria at the Universiti Sains Malaysia (USM). The efficiency of EC, US, and US-EC, combined methods for O&G removal, was investigated using a batch reactor (pH 7). The interelectrode distance (ID, 2-6 cm), electrolysis time (T, 15-35 min), and current density (CD, 40-80 A/m(2)) were analysed, followed by RSM. The response variables were O&G (1000 mg/L) and chemical oxygen demand (COD low range, 1000 mg/L). The central composite design (CCD) with a quadratic model was used to appraise the effects and interactions of these parameters. The morphological surface of the electrode used was observed via scanning electron microscopy (SEM). The optimum removal efficiencies obtained were 95.4% (O&G) and 75.9% (COD) (ID: 2.4 cm, T: 30.5 min, and CD: 53.2 A/m(2)). The regression line fitted the data (R-2 O&G: 0.9838, and R-2 COD: 0.9558). The SEM images revealed that the use of US was useful in minimising cavitation on the electrode surface, which could lower the EC treatment efficacy. The US-EC combined technique is highly recommended for O&G removal from the food industry's wastewater.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available