A process for the preparation of antioxidants from Hibiscus sabdariffa calyces, Jayaprakasha

The present invention relates to a process a process for removing lead from lead containing industrial waste waters or effluents. This invention particularly relates to a process for removal of lead from industrial waste waters or effluents using cheap, easily available, easy to handle solid industrial waste as adsorbent from the solid waste selected from leach residue of manganese ore, sea nodule residue, iron precipitate from the zinc extraction, possessing a very high adsorption capacity for the toxic elements like lead which would cause hazardous effects on the environment if disposed off untreated. The process avoids the problem of solvent handling etc by providing technically simple non-tedious and clean process