I D
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chemical Engineering MagazineChementator Briefs
PDH catalyst Last month, Clariant's Catalyst business (Munich, Germany; www.clariant.com)…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILESOLIDS PROCESSINGENGINEERING PRACTICEEQUIPMENT & SERVICESFOCUS
Focus on Pumps
Self-priming, liquid-ring pumps enable hygienic operation The CFS AS/ASH Series…
NEW PRODUCTS + Show More

Comment Water Treatment

Removing harmful metals from wastewater with crab shells

By Paul Grad |

Copper and cadmium exist naturally in the environment, but human activity can increase their concentrations to a point where they become a health hazard. Conventional wastewater treatment to remove those metals includes chemical precipitation, coagulation, flocculation, ion exchange, membrane filtration, activated carbon, and the use of carbon nanotubes. However, naturally occurring biosorbents can clean up contaminated water at the same efficiency, and with little impact on the environment and on human health. Crab shells from Scylla serrata (mud crab) proved to be a good biosorbent for removing copper and cadmium from industrial wastewater by researchers from the Universiti Putra Malaysia (Serdang, Malaysia; www.upm.edu.my). The researchers chose crab shells due to their abundance and ready availability as waste products. The crushed crab shells were able to remove up to 94.7% of copper (5 mg/L initial concentration), and 85.1% of cadmium (1 mg/L initial concentration). The conditions (pH = 6, T = 25°C) closely matched the wastewater effluent characteristics from industrial mining and metal refining. Crab shells consist of calcium carbonate and protein (29.19%), ash (40.60%), lipids (1.35%), and chitin (26.65%) on a dry weight…
Related Content
Removing PFAS from wastewater
A new low-cost, safe and environmentally friendly method for removing polyfluorinated alkyl substances (PFAS) from water has been developed by…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Quadruple Sensor Lifetime with a Retractable Housing
Minimizing Explosion Risk Where Other Solutions Cannot
Minimizing Corrosion with Fast, Robust Gas Analysis
Lower Measurement Point Costs with Automatic pH Sensor Cleaning
Reduce the Risk of Corrosion in Fertilizer Production

View More

Live chat by BoldChat