Abstract

ABSTRACT The leather industry produces a large amount of tannery sewage sludge every year, which is a dangerous solid waste, but also a secondary resource. In the present research, the extraction of chromium from the tannery sewage sludge was investigated through the process of blank roasting-sodium carbonate roasting-water leaching and the process of sulfuric acid curing-water leaching, respectively. The process of sulfuric acid curing-water leaching was characterised by high extraction of chromium, a simple process as well as low cost of mineral decomposition, which made it the better option. For the process of sulfuric acid curing-water leaching, the leaching of chromium reached up to 99.5% under the optimum conditions of sulfuric acid curing (raw tannery sewage sludge cured at room temperature for 5 min with 42 wt% sulfuric acid addition), followed by water leached at 100°C for 30 min with a liquid/solid ratio of 2 mL/g.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.