Microbiological and Performance Evaluation of Sequencing Batch Reactor for Textile Wastewater Treatment

Abstract

BSTRACT: This study focused on laboratory-scaled and real-scaled treatment plant performances and microbiological investigations for the optimum treatment of textile industry wastewater performed with sequencing batch reactor (SBR). As a result of experimental studies of laboratory-scaled SBR treatment unit, optimum treatment efficiency was taken from 0.5 h filling to 1.5 h. reaction to 1.5 h. settlement to 0.5 h. discharge-idle periods. Average chemical oxygen demand (COD) removal efficiency of SBR of laboratory-scaled textile industry was 75%, whereas average turbidity and color removal (coloration number [RES, m"'] 586 nm) efficiencies were 90% and 75%, respectively. Optimum reaction and settlement periods were used in a real-scaled plant, and plant efficiency was examined for parameters such as COD, phenol, pH, mixed liquor suspended solids (MLSS) and sludge volume index (SVI). In this study, optimum reaction and settlement periods for treatment of textile industry wastewater were determined within a SBR in a laboratory-scaled plant. These reaction and settlement periods were verified with the measurement of COD, color, and turbidity parameters. Floe structure and protozoa-metazoa species of activated sludge in a SBR were also determined. Optimum reaction and settlement times were used in a real-scaled plant, and plant efficiency was examined for COD, Phenol, pH, MLSS, and SVI parameters. The corresponding values were found as appropriate, acceptable, and meaningful because of variance value of statistical analysis.Protozoa and metazoan in the activated sludge in the laboratory-scaled plant were investigated. Peranema sp., Epistylis sp., Didinium sp., Chilodonella sp., Opercularia sp., Vorticella sp. as protozoa species and Habrotrocha sp., Philodina sp. as metazoa species were determined. Water Environ. Res., 84, 346 (2012).

Effect of Environmental and Operational Parameters on Sequential Batch Reactor Systems in Dye Degradation

“…Sludge bulking occurs when the MLSS value is high, rendering the dye treatment system less efficient. In a dye containing wastewater, SBR system efficacy was improved to 75% by increasing MLSS values up to 2000 mg/L with 90 Turbidity and 75% COD removals (Ogleni et al, 2012). Batch experiments showed there was great potential in applying high MLSS for dye degradation.…”

“…Recently, the usage of SBR in dye containing wastewater treatment, has continuously receive attention from scientists because it is an efficient process for wastewater treatment. SBR is widely preferred in dyes containing wastewater treatment (Ogleni et al, 2012). More so, taking advantage of the high SBR versatility, the control parameters can be changed appropriately and the decolorization potential be recovered (Moghaddam & Moghaddam, 2016).…”

“…It makes biological reactions gauging carried out with standard procedures more difficult. Operational difficulties such as COD fluctuations are also common during system operation (Ogleni et al, 2012). In other to curtail the effect of the aforementioned factors, several approaches have been adopted by researchers to address the weak performance of the aerobic biological elimination of dyes.…”

“…SBR as an alternative to conventional suspended growth wastewater treatment system is a sludge activation mechanism that has been tweaked to integrate both aerobic and anaerobic phases in a single unit for enhanced COD and dye degradation (Hakimelahi et al, 2012;Sathian, Rajasimman, Radha, Shanmugapriya, & Karthikeyan, 2014). It solves bulking sludge and low-density bio-sludge problems caused by clarifier large capacity (Ogleni et al, 2012). The traditional SBR is a crucial process for nitrification-denitrification, in which ammonia is initially oxidized to nitrite, followed by the oxidation of nitrite to nitrate and the formation of nitrogen gas (Santos & Boaventura, 2015).…”

“…It has a long history of usage in the treatment of textile waste, particularly for azo dyes elimination because they allow the fungal activity to be maintained over extended duration and may achieve better results in dye decolorization when compared with batch cultivation (Lourenco et al, 2006). A According to (Ogleni et al, 2012), SBRs are extremely effective in textile industrial wastewater degradation for organic matter, nutrients and dying materials (Ng, Wong, Kutty, & Jagaba, 2021).…”