Tiyasha Kanjilal

Application of mango seed integuments as bio-adsorbent in lead removal from industrial effluent

AbstractUtilization of biological waste in treatment of industrial effluents is an emerging field of research. In present context of waste management, bio-adsorbent-based techniques are wellestablished as inexpensive and eco-friendly approach for cleaning up contaminated effluents from various industries and as a part of sustainable process developments. Mango seed integuments have been used in this study as biological waste. The main objective of this study was based on the removal of heavy metal lead (Pb) (II) from paint industry effluent using the mango seed integuments. Efficiency of the process was optimized with variation of the process parameters such as adsorbent dosage, contact time, initial [Pb(II)] concentration, and adsorbent nature. The nature of adsorption was also assessed using standard isotherms. This work showed the potential of the mango seed integuments as bio-adsorbent for removal of lead ions from paint industry effluent.

Assessing treatment of lead (Pb II) from industrial wastewater on dried bulbs of water hyacinth: adsorption capacity, isotherm and kinetic study

Remediation through aquatic macrophytes treatment system for the removal of noxious contaminants from wastewater is an emerging environmental protection technique. The dried and acid-alkali treated bulbs of water hyacinth (WHB) having high porosity and O2-filled functional groups were utilised to treat Pb(II) from industrial wastewater. Characterisation of WHB with FESEM, XRD and FTIR exhibited the presence of several carboxyls, hydroxyl, ketonic, aldehydes and other O2-filled functional groups showing WHB adsorption with highest monolayer capacity of (Qm) 38.614 mg/g. WHB adsorption directed towards the pseudo-second order kinetics and Langmuir isotherm mechanism. The study also emphasised effective regeneration of WHB using HNO3, NaOH and vacuum dry. The bio-sorption mechanism was observed to be endothermic spontaneous reaction process, with ΔG decreased from -0.71 to -8.53 with increasing temperature. With optimised and controlled process conditions, only 5.0 g L−1 of WHB bio-sorbent could significantly treat about 85.3% of 100 mg L−1 of Pb(II) within 120 minutes at pH 7.0 and 30°C. Also a comparative optimisation study of ANN and RSM were used to predict the WHB bio-sorption bioprocess. Therefore, WHB have efficient potential to be commercially applicable as an environmental-friendly and economical bio-sorbent for treatment of Pb(II) from solutions and effluent from paint industry.