Triarylmethane Dye Decolorization by Pellets ofPycnoporus sanguineus: Statistical Optimization and Effects of Novel Impeller Geometry

Abstract

A study was carried out to optimize selected parameters for decolorization of a triarylmethane dye, such as crystal violet by white rot fungus, Pycnoporus sanguineus, pellets. The parameters studied were initial dye concentration (ppm), agitation speed (rpm), and process time (days) and were optimized using response surface methodology (RSM). It is shown that process time, agitation speed, and their interactions have significant effects on the decolorization process. Following the optimization, the decolorization study was extended to a stirred tank reactor (STR) process. Effects of different geometry of impellers on the decolorization process and power consumption were studied. Novel impeller geometries, such as 180 • curved blade and 60 • angled blade impellers, were used in the STR. The application of 180 • curved blade impeller resulted in higher percentage of decolorization at a relatively less power consumption as compared with 60 • angled blade impeller.

Fungal pelleted reactors in wastewater treatment: Applications and perspectives

“…As an example, Sulaiman et al [82] developed a STR with novel impeller geometry (60 o and 180 o curved blade impellers) for decolourization of triarylmethane dye by pellets of Pycnoporus sanguineus. High removal efficiency (>80%), at a relatively less power consumption, was achieved when using the 180 o curved blade impeller along with low agitation speed compared to a traditional STR.…”

“…STR has been used for the removal of pharmaceuticals [42], dyes [81,82] and metals [83]. For example, Rodarte-Morales et al [42] used Phanerochaete chrysosporium pellets in a STR for the removal of pharmaceutical compounds, viz., diclofenac, ibuprofen, naproxen, carbamazepine and diazepam.…”

Bioreduction of selenite and tellurite by Phanerochaete chrysosporium

“…shaving the fungal biomass when the desired thickness has been exceeded (Lema et al, 2001)  Proper fluidization by continuous supply of air, allowing gas-liquid-pellet separation (Moreira et al, 2003)  Pellet aggregation may lead to bumping, spouting and slugging of the bed (Kunii and Levenspiel, 1968) Stirred tanks are the largest group of reactors for culturing fungal pellets and their use has also been well-documented in wastewater treatment. STR has been used for the removal of pharmaceuticals , dyes Sulaiman et al, 2013) and metals . For example, Rodarte-Morales et al ( 2012) used Phanerochaete chrysosporium pellets in a STR for the removal of pharmaceutical compounds, viz., diclofenac, ibuprofen, naproxen, carbamazepine and diazepam.…”

“…The next generation of STR should consider the implementation of novel mechanical systems that allow improving operational conditions in the system and therefore the removal efficiency of pollutants. As an example, Sulaiman et al (2013) developed a STR with novel impeller geometry (60 o and 180 o curved blade impellers) for decolourization of triarylmethane dye by pellets of Pycnoporus sanguineus. High removal efficiency (>80%), at a relatively less power consumption, was achieved when using the 180 o curved blade impeller along with low agitation speed compared to a traditional STR.…”