Potential of Rice Husk Biosorption in Reduction of Heavy Metals from Oryza Sativa Rice

Fraimah Alidoost Saharkhiz Lahiji¹, Parisa Ziarati^2* and Afshin Jafarpour³

¹Pharmaceutical Sciences Research Center, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran-Iran (IAUPS).

²Department of Medicinal Chemistry, Pharmacy Faculty, Pharmaceutical Sciences Branch, Islamic Azad University (IAUPS), Tehran, Iran.

³Department of Food Sciences and Technology, Pharmaceutical Sciences Branch, Islamic Azad University, Tehran -Iran (IAUPS).

Corresponding Author E- mail: ziarati.p@iaups.ac.ir.

DOI : http://dx.doi.org/10.13005/bbra/2388

ABSTRACT: In Iran and some countries the major uses of agricultural waste are animal feed and as fuel in factories. In many cases, farmers attempted to burn these additional appearance materials which Leads to environmental pollution and in other hand reduce the fertility of the ground. To manage waste agricultural biomass and to convert it into a material resource this research was carried out. Two field experiments were carried out to evaluate rice (Oryza sativa) productivity in silt loam to which 50 Mg ha(-1) of rice husk were added as a control. The field experiment in Guilan province in the north of Iran was conducted to investigate the effect of dry rice husk on the bioavailability of heavy metals: Lead, Nickel and Cadmium in soil and their accumulation into rice plants and final rice grain product. Phytoavailability of Cd was most dramatically influenced by bio-sorbent addition. Rice husk addition in paddies 10 days before the transplanting rice stems significantly decreased Cd concentrations in rice grain (72.13 %). Following bio-sorption addition, lead and Nickel concentrations decreased by 59.53 % and 50.44% respectively and increase Potassium , Zinc , and copper  in crop yield significantly( p≤ 0.03), which approve the effect of the uptake of some nutrients in the presence of rice husk. In conclusion, these results highlight the potential for dry rice husk to alleviate the phyto-accumulation of heavy and toxic metal (loid)s and to thereby reduce the toxicity and   exposure associated with rice consumption.

KEYWORDS: Rice (Oryza sativa L.) ;Rice Husk;  Soil contamination ; Biosorption; Agricultural waste

[ HTML Full Text]