Phu Ho Dai
University of Technology, Vietnam
Title: Research typical application using biological sludge, control and evaluation of heavy metals in fertilizers brewed from biological sludge for rice
Biography
Biography: Phu Ho Dai
Abstract
The study showed that the process of anaerobic decomposition contract by mesophilic composting method for efficiently handling heavy metals very well (over 60%). With the use of compost from bio sludge with 3% for rice, in addition to the ability to support the growth of the rice plant body length in the seedling stage (13.8%), the environment has cumulative expression levels of heavy metals Cu, Zn, Pb, Cd and Ni. Most heavy metals are concentrated in the soil and vegetation does not appear in the aquatic environment. Specifically, the amount of soil to accumulate Cu, Zn is the largest and rise through the service; plant in Cu, Zn, Pn, Ni, order accumulation of heavy metals in rice roots>leaves>body>seed. Especially the presence of heavy metals Ni=0.31 mg/kg, Zn=19.7 mg/kg in grain capable of causing bioaccumulation for users. A different result, as the metal in fertilizer only accumulate in the soil and vegetation to limit the exposure of pathways on the environment fell from 14 to 8 road route of exposure.