One way to clean up hazardous heavy metals like arsenic, lead and mercury in contaminated materials could be to use waste from the processing and canning of onions (Allium cepa L.) and garlic (Allium sativum L.)

Biotechnologists Rahul Negi, Gouri Satpathy, Yogesh Tyagi and Rajinder Gupta of the GGS Indraprastha University in Delhi studied the influence of acidity or alkalinity, contact time, temperature and concentration of the different materials present to optimize conditions for making a biological heavy metal filter for industrial-scale decontamination.

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