Research Regarding the Accumulation in Soybeans of Heavy Metals from Anaerobic Composted Sewage Sludge Used as Organic Fertilizer

Benoni Lixandru, Viorel Pătroescu, Elisabeta Pena Leonte, Neculai Dragomir, Anca Pricop, Smaranda Mâşu, Florica Morariu, Dumitru Popescu

Abstract


In sewage sludge from urban wastewater treatment stations can often be find high levels of Ni, Pb, Cu, Zn, Mn andCd. Aerobic or anaerobic composting of this sewage sludge does not eliminate the possibility of bioaccumulation ofthese metals in plants through metabolic processes of phytoextraction type. Researches regarding the accumulationdegree of heavy metals through phytoextraction processes were performed on soybean plants (Glycine max), Condorvariety. Plants were fertilized with anaerobic composted sludge in amounts of 25 t of / ha, 50 t / ha and 100 t / ha.The chemical analysis was done on an average sample of three repetitions. Metal concentration in soybeans wasanalyzed by reporting to the maximum allowance level for sheep, considered one of the most sensitive farm speciesto heavy metal toxicity. Our results showed a higher level than normal with 5.8 mg / kg only in the case of copperions. Zn, Pb, Mn and Cd concentration in soybeans was below the maximum allowance limits set by the rules offeeding farm animals. Also, heavy metal content of soybeans was not affected by the amount of composted sludgeused as fertilizer.

Keywords


anaerobic composted sludge; bioaccumulation; heavy metals; soybean

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LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Bioengineering Faculty of Animal Resources
300645, Timişoara, Calea Aradului 119, Romania

E-mail: spasb [at] animalsci-tm.ro
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