Abstract
Spinning disc (SD) technology has been successfully applied, for the first time, in real textile wastewater treatment with no other additional processing. The SD efficiency was investigated using real textile effluents to study the color and suspended solids removals at different effluent-supplying flowrates (10–30 L/h) and different disc rotational speeds (100–1500 rpm) with good experimental results; thus, it can minimize the polluting loads within a short time period. Furthermore, within this study, process modeling and its classical optimization were applied to SD technology for wastewater treatment. The experiments were organized according to an active central composite rotatable 23 order design, considering as independent variables the wastewater flowrate, rotational speed, and operating time and, as optimization criteria, the suspended solids removal and discoloration degree. Overall, this novel study proved that the SD technology applied in textile effluent treatment is a suitable alternative to a primary mechanical step.
Highlights
The working principle of the Spinning disc (SD) relies on centrifugal force acting on the liquid fed at the center of a spinning disc [6], resulting in a rippled thin liquid film characterized by an advanced turbulence and a high mixing intensity, which enables increased transport phenomena such as heat and mass transfers
After each studied variable variation field was established, an experimental design respecting the active central composite rotatable 23 design was applied in the laboratory spinning disc setup for textile wastewater treatment
The studied textile wastewaters were produced in a NE Romanian textile company that manufactures cotton fabrics colored from yellow to red during the period time of this study
Summary
The role of new techniques applied in environmental treatments and the necessity of environmental system analysis have been outlined in recent years [1,2]. The spinning disc with a nanostructured thin film of ZnO and TiO2 photocatalysts has been used for the degradation of some pollutants, such as methyl orange and rhodamine B dye or 4-chlorobenzoic acid [14,15,16]. Given the enhanced spinning disc reactor (SDR) flow characteristics, the current study has as its primary objective the investigation of the SD technology’s efficiency in the treatment of a textile effluent without the initiation of any other mechanical-physical, chemical, or biochemical process, mainly regarding the suspended solids, turbidity, and color removal. No other investigation regarding wastewater treatment using spinning disc technology, as is described below, has been performed before. After each studied variable variation field was established, an experimental design respecting the active central composite rotatable 23 design was applied in the laboratory spinning disc setup for textile wastewater treatment. Rigorous empirical modeling and monitoring methods are becoming very important in each industrial wastewater treatment system, as reported in several studies [27,28,29,30,31]
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