The effect of surfactants on the treatment of chemical mechanical polishing (CMP) wastewater by electro-coagulation-flotation (ECF) process was studied. Two surfactants, cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS) were employed in this study to compare the effect of cationic (CTAB) and anodic (SDS) surfactants on ECF. The cationic surfactant can enhance the removal of ...

Abstract In this work, a commercially available water treatment polymer poly(N,N-diallyl-N,N-dimethylammonium chloride) (PDADMAC) and hydrophobically modified (HMP) designed to adhere bubble surfaces were applied for the first time in novel Posi-dissolved air flotation process (PosiDAF) that uses polymer-modified bubbles, at pilot-scale of waste stabilisation pond samples rich algae. It was fou...

Flotation wastewater treatment is widely used in various systems. The choice of aeration system plays a considerable role the development highly efficient flotation tanks. objective this work to point out factors that influence flotator type, and offer recommendations based on literature review data analysis. In paper, types systems tanks are considered: mechanical, pneumatic, pneumohydraulic e...

Presence of microplastics in waste streams and the environment is a challenge much recent concern. Bubbles are used for solid–liquid separation froth flotation dissolved air (DAF). Bubble-particle interactions key understanding removal efficiency particulates. Limited studies provide in-situ characterization particle size distribution, shape concentration before after flotation. The use microbu...

Dissolved air flotation (DAF), an effective treatment method for clarifying algae/cyanobacteria-laden water, is highly dependent on coagulation-flocculation. Treatment of algae can be problematic due to unpredictable coagulant demand during blooms. To eliminate the need for coagulation-flocculation, the use of commercial polymers or surfactants to alter bubble charge in DAF has shown potential,...

The Barapullah drain crosses through New Delhi, India, and transports millions of cubic meters stormwater, municipal sewage industrial to the Yamuna River. Seasonal variations ambiguous annual discharges cause 20-fold fluctuations in hydraulic flows, pollutants type concentration. Furthermore, Delhi is among most densely populated areas on planet, with limited surface area high water stress. Di...

Effluents with high silica content can exceed the discharge limits and/or limit the application of reuse treatments based on reverse osmosis membranes. In these cases, silica removal is usually carried out in the effluent by coagulation. In this work, silica is removed from process waters in dissolved air flotation (DAF) units used as internal treatments. It is hypothesized that the presence of...