Navigation Links
Earthworms soak up heavy metal
Date:8/16/2012

Earthworms could be used to extract toxic heavy metals, including cadmium and lead, from solid waste from domestic refuse collection and waste from vegetable and flower markets, according to researchers writing in the International Journal of Environment and Waste Management.

Swati Pattnaik and M. Vikram Reddy of the Department of Ecology and Environmental Sciences, at Pondicherry University, in Puducherry, India, explain how three species of earthworm, Eudrilus eugeniae, Eisenia fetida and Perionyx excavates can be used to assist in the composting of urban waste and to extract heavy metals, cadmium, copper, lead, manganese, zinc, prior to subsequent processing.

With rapid increases in urban populations particularly in the developing world, there is a growing problem of how to manage organic waste and to find alternatives to landfill disposal particularly for domestic food waste and that from vegetable markets. According to the research team, it is an unfortunate fact of life that much of this waste is currently dumped on the outskirts of many towns and cities and is causing serious pollution, disease risk and general ecological harm. It also represents a considerable wasted resource, whereas the organic matter might be exploited usefully in growing food crops.

The process of vermicomposting in this way allows such waste materials to be remediated and the compost used subsequently for use in growing human food without the risk of accumulating heavy metals in crops. The team says that up to about three-quarters of the various heavy metals can be removed by the worms from solid waste. The E. eugeniae species was the most effective worm at remediating solid waste and producing rich compost. The team's tests on vermicomposting reveal that the heavy metal content of such waste can be reduced to levels significantly below the permissible safe limits.

The worms' digestive system is apparently capable of detaching heavy metal ions from the complex aggregates between these ions and humic substances in the waste as it rots. Various enzyme-driven process then seem to lead to assimilation of the metal ions by the worms so that they are locked up in the organism's tissues rather than being released back into the compost as worm casts. The separation of dead worms from compost is a relatively straightforward process allowing the heavy metal to be removed from the organic waste.


'/>"/>

Contact: Vikram Reddy
venkateshsrinivas1@gmail.com
Inderscience Publishers
Source:Eurekalert

Related biology news :

1. Handful of heavyweight trees per acre are forest champs
2. Kinesiology team gets $975,000 Defense grant to study effects of heavy loads on soldiers
3. A new avenue to better medicines: Metal-peptide complexes
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... , April 11, 2017 NXT-ID, ... security technology company, announces the appointment of independent Directors Mr. ... to its Board of Directors, furthering the company,s corporate ... ... NXT-ID, we look forward to their guidance and benefiting from ...
(Date:4/4/2017)... 4, 2017   EyeLock LLC , a leader ... United States Patent and Trademark Office (USPTO) has issued ... linking of an iris image with a face image ... the company,s 45 th issued patent. ... timely given the multi-modal biometric capabilities that have recently ...
Breaking Biology News(10 mins):
(Date:8/22/2017)... ... August 22, 2017 , ... KBioBox ... patented KBioBox technology, the extended GUIDE-Seq ananlysis. KBioBox has adapted their core technology ... be provide scientists with easy to understand reports, extended indel analysis, and translocation ...
(Date:8/21/2017)... ... August 21, 2017 , ... Baltimore biotech firm, PathSensors, ... to bring its proprietary CANARY pathogen detection technology and high throughput testing solutions ... has purchased an undisclosed number of PathSensors’ Zephyr pathogen detection instruments and will ...
(Date:8/18/2017)... ... 18, 2017 , ... Producers of the award winning American ... an upcoming episode, scheduled to broadcast fourth quarter 2017. American Farmer airs Tuesdays ... independent, family-owned seed company. Educating audiences about its broad portfolio of products to ...
(Date:8/16/2017)... ... August 16, 2017 , ... Tunnell Consulting announced today that ... ISPE Annual Meeting and Expo , to be held October 29 through November ... is “Driving innovation to advance patient therapies.” , The ISPE Annual Meeting and Expo ...
Breaking Biology Technology: