An up‐flow fixed column study was conducted to remediate Remazol Brilliant Orange 3R (RBO3R) from contaminated solutions using biochar derived from Ulva lactuca biomass. The influences of column parameters on dye sorption were studied in detail, which include initial RBO3R concentration, bed depth, and flow rate. Optimization experiments indicated that maximum RBO3R column uptake of 0.114 mmol/g was observed at 0.25 mmol/L (initial RBO3R concentration), 0.3 L/hr (flow rate), and 25 cm (U. lactuca bed depth). Modeling of column sorption data was performed using the Yoon–Nelson, modified dose–response and Thomas models. The spent biochar was desorbed and rejuvenated using 0.01 M NaOH. The elutant (0.01 M NaOH) exhibited 99.7% efficiency, and the process was completed in 115 min with high overall concentration factor of 8.4.Practitioner points
This study explores the impact of column parameters on the dye removal potential of U. lactuca‐derived biochar.
At optimized condition, the biochar bed exhibited highest Remazol Brilliant Orange 3R uptake capacity of 0.114 mmol/g.
The regeneration and desorption of U. lactuca‐derived biochar bed was possible with NaOH (0.01 M) as elutant.
Tannery effluent was collected from Common Effluent Treatment Plant, Dindigul, Tamil Nadu and used for analysis for physico-chemical, heavy metals and biological properties. Soil samples were collected from the field and Aspergillus sp. and Pseudomonas sp. were isolated and pure cultured. The pH of the tannery waste water was around 8.50 and electrical conductivity was 2.89 dS/m indicating the alkalinity of the effluent. Total dissolved solids(TSS) was found to be 1460 mg/L and BOD showed 2346 mg/l. The AAS reading of chromium in the effluent indicated 205 mg/L which means the effluent can not be released into the environment without proper treatment. The metal tolerance capacity of the organisms was tested at different concentrations of chromium salts dissolved in tannery effluent viz., 25 to 200 ppm with 25 ppm of increment for each of the treatment. Pseudomonas sp.tested tolerated upto 100 ppm,while the Aspergillus sp could resist upto 75 ppm of chromium concentration. It was also found that the Pseudomonas sp. had potentially removed chromium from aqueous spiked solution with effluent, hence it could be a good biosorbent for the removal of chromium from tannery effluent contaminated agricultural fields.
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