Abstract
The paper presents an experimental study regarding the treatment of a real textile wastewater using the spinning disc (SD) technology, either individually or associated with an advanced Fenton oxidation step. The SD efficiency was investigated by studying the color, suspended solids, or turbidity removals, at distinctive feeding flowrates (10–30 L/h) and disc rotating speeds (100–1500 rpm). The data revealed increasing removal trends and allowed to establish the highest removal values. Based on obtained experimental results, the wastewater treatment efficiency by SD technology was reasonably good and thus, the WW indicators can be improved within relatively short periods of time. Additionally, based on supervised learning algorithms, the study includes treatment modeling for turbidity and color removal, followed by turbidity removal optimization relying on the best learned models. Satisfactory results obtained with the modeling and optimization procedures provide useful predictions for the approached treatment processes. Furthermore, within this study, a Fenton oxidation process was applied to SD technology to minimize the color and solids content. The influence of pH, hydrogen peroxide and ferrous ions concentrations was also investigated in order to establish the highest removal efficiencies. Overall, the SD technology applied in textile effluents treatment proved to be an appropriate and efficient alternative to classical mechanical step applied within the primary treatment step and, when associated with an advanced oxidative process in the secondary step, rendered good improvement, namely of 62.84% and 69.46% for color and respectively, suspended solids removal.
Highlights
One of the process intensification technologies often used in recent years for a diversity of applications is the spinning disc (SD) technology
The application of SD technology for a textile effluent treatment has certain advantages associated with the mono-block setup type requiring relatively limited space and which is commonly used for relatively small sized particles (
Higher than 90%, or complete (100%) removals of turbidity and color would be obtained if supplementary wastewater treatment steps will be applied after the Fenton oxidation, e.g., an advanced adsorption step, electro-flotation-coagulation, membrane processes or biological steps, but the main scope of our research is to demonstrate the improvement of textile effluent color and solids contents when the spinning disc reactor (SDR) technology is applied in association with a chemical treatment step based on the Fenton oxidation, at the corresponding working conditions for highest treatment performance
Summary
One of the process intensification technologies often used in recent years for a diversity of applications is the spinning disc (SD) technology. Due to a number of research studies on the spinning disc efficiency in different areas such as polymers production [1], nanoparticle manufacturing [2], biological treatments [3], a number of chemical process industries have adopted the SD technology with significant impacts on final product yield, quality, safety and costs [4]. The WWs from the textile industry are considered to be a significant pollution source of persistent organic pollutants and suspended/colloidal solids which might pose a risk to humans and the environment if are not well separated or eliminated by an efficient WW treatment technology [10,11,12]. The application of SD technology for a textile effluent treatment has certain advantages associated with the mono-block setup type requiring relatively limited space and which is commonly used for relatively small sized particles (
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