Abstract
Laundry wastewater contains a large number of surfactants, suspended solids and other pollutants, and the COD value is high. If the wastewater is discharged into the water without harmless treatment, it will cause serious environmental pollution. The electrocoagulation process was selected as a promising environmentally friendly technology for treating domestic laundry wastewater. In this paper, the contribution of the liquid and powder detergents to the composition of domestic laundry wastewater was investigated. Combination of stainless steel and aluminum anode electrodes were compared. The effect of electrolysis time and current density on the removal of COD, LAS and turbidity of liquid detergent and powder detergent laundry wastewater were evaluated. The experimental results showed the electrocoagulation process has significant removal. It was found that the electrolysis time in 25 minute, current density in 5 mA/cm2 had optimum efficiency when considering efficient removal and economic energy consumption. For Liquid detergent laundry wastewater, COD, LAS and turbidity removal rates were 84%, 93% and 96%. For powder detergent laundry wastewater, COD, LAS and turbidity removal efficiency were 80%, 83% and 91%, respectively. Energy consumption in the optimum conditions for liquid detergent and powder detergent laundry wastewater by electrocoagulation were 7.324KWh/m3, 3.642KWh/m3, respectively, while using combination of stainless steel and aluminum anode electrodes equals 1 to 1.
Highlights
Detergents are frequently applied in many fields, such as personal and household cleaner, fuel additives and biological reagents[1]
Laundry detergents are commonly commercially available as powder detergent and liquid detergent which are composed of various kind of mixture detergent, and anionic detergents account for majority
It was found that powder detergent laundry wastewater has significantly higher electrical conductivity and more LAS and less COD in comparison with liquid detergent under the same detergent dosage
Summary
Detergents are frequently applied in many fields, such as personal and household cleaner, fuel additives and biological reagents[1]. Domestic laundry wastewater is one of the major contributions of detergents. The generated laundry wastewater contains a large number of pollutants such as surfactants, phosphates and oil stains. If the laundry wastewater is discharged into the water at will, the excessively high content of nitrogen and phosphorus will cause eutrophication of the water, and LAS will have a toxic effect on aquatic animals and plants, and will increase the solubility of some micro-pollutants in the water. Domestic laundry wastewater is discharged directly into rivers without proper treatment, causing serious damage to aquatic animals, plants and ecological environment. It is of great significance to study the technology of laundry wastewater treatment to reduce the discharge of sewage, improve the ecological environment and produce ecological and economic benefits
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