Bio-absorption is presented as an alternative to traditional physicochemical means for removing toxic metals from ground water and wastewater. In this research 99 bacterial strains were isolated from three wastewater samples from one of Iran petrochemical industries. Ex More
Bio-absorption is presented as an alternative to traditional physicochemical means for removing toxic metals from ground water and wastewater. In this research 99 bacterial strains were isolated from three wastewater samples from one of Iran petrochemical industries. Examination of these isolated for Pb2+ tolerance were carried out by using PYT agar medium containing different concentrations of Pb (NO3)2 from 4 to 15 mM. The isolated KAH1, KAH2 and KAH3, had tolerance to Pb 15, 6.5 and 6.5 mM respectively. These high tolerant strains were selected and their ability of lead bio-absorption, were investigated by atomic absorption spectrophotometer. The highest ability was observed in the strain KAH1 and this strain decreased Pb concentration from 80 mg/l to 44.4 and 48.2 mg/l after 48 and 96 hours incubation, respectively. The results of the experiments showed that bio-absorption was affected by the initial pH of the medium, initial metal ion and exposure time. According to the morphological, physiological and biochemical characterizations of the strain with that of valid strains, the strain was tentatively identified as Bacillus sp. strain KAH1. The maximum Lead bio-absorption capacity of KAH1 isolate was determined to be 48.25 mg/g (97.67%) at pH 4.0 with 150 mg/l concentration in 4 hours equilibrium time
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Findings the efficient method for removing of terephthalate compounds from industrial wastewaters is considered a big challenge in the world. In this study, an efficient Iranian and worldwide methods to remove terephthalate compounds from petrochemical industrial wastew More
Findings the efficient method for removing of terephthalate compounds from industrial wastewaters is considered a big challenge in the world. In this study, an efficient Iranian and worldwide methods to remove terephthalate compounds from petrochemical industrial wastewaters were investigated. In this regard, no studies with Persian languages were found. To review the studies conducted in the rest of the world, articles were searched with Google engine in databases including springer; science direct; online library Wiley; iwap online and.... 40 articles were included in this study. These articles were categorized and ranked based on the type of contaminant and the selected removal methods. The studies were ranked as fallow; 1: COD removal efficiency industrial wastewater including PTA (41%), 2: removal of soluble materials (14%), 3: removal of suspended solids (11%), 4: removal of heavy metal (9%) and investigation the type of bacterial colonies in the treatment plants (7%). These study showed that the anaerobic process has a good efficiency to treat this type of wastewater, so, has been mostly studied to remove organic matter and a satisfactory result has been obtained in this field. For industrial wastewaters containing terephthalate compounds, the neutralization, initial sedimentation, anaerobic and aerobic processes can be used as a reliable process to treat this type of wastewater.
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In this study, the degradation of 4-nitrophenol in aqueous environments was studied by Electro Fenton and Electro Persulphate in electrochemical batch reactor equipped with four iron electrodes and a direct power source. The results showed that the removal of 4-nitrophe More
In this study, the degradation of 4-nitrophenol in aqueous environments was studied by Electro Fenton and Electro Persulphate in electrochemical batch reactor equipped with four iron electrodes and a direct power source. The results showed that the removal of 4-nitrophenole in Electro-Persulphate and electro Fentone were 99.2% and 94% at optimum operation condition including operational pH at 3, the initial concentration of 4-nitrophenol at 100 mg / l, hydrogen peroxide and persulphate at 0.5 mM, with the density of 0.1 A/dm2 and 60 min of reaction. The research results showed that the processes of electro-persulfate and electro-fenton had the same elimination efficiency in acidic media for 4-nitrophenol removal and, in general the combination of electrochemical with persulfate and hydrogen peroxide for electrical production of iron and activation of persulfate and hydrogen peroxide had more ability compared to separate use. The removal percent of COD in real wastewater samples with the initial COD of 5000 mg/l were 82 and 86% in ElectroFenton and Electro-persulfate processes, respectively.
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