نتایج جستجو برای: removal of chromium
تعداد نتایج: 21173331 فیلتر نتایج به سال:
duckweeds are of special interest, as they are naturally growing weeds that have the capacity to tolerate and remove toxic pollutants, including heavy metals from the environment. studies have revealed that duckweed (lemna minor) can tolerate and remove heavy metals from aqueous solutions. in the present study, the efficiency of l. minor in the removal of ni and cr individually from aqueous sol...
Background and purpose:As the usage of chromium in chemical industries, electroplating, leather tanning and paint processes will increase, so the chromium pollution in water has become a considerable problem. Hexavalent chromium (Cr (VI)) has been reported toxic to aquatic organisms, animals and humans. It has been known to be carcinogenic. Thus, it should be removed from wastewater before disc...
abstract background: heavy metals in industrial wastewater especially chromium (vi) are considered as the main environmental pollutants. methods: electrochemical cell made of plexiglass with a volume of 1.95 lit was used. iron and graphite electrodes, electricity conductor, each with dimensions of 0.1×3×10 cm (width×length×height) were designed and built. tests were carried out in various condi...
Background and Objectives: Because of toxical and hazardous properties of hexavalent chromium (Cr(VI)), its removal by an economical and efficient method is necessary. The use of activated carbon, as an adsorbent, is a common and effective method for hexavalent chromium removal. Thus the aim of this study was to produce granular and powdered activated carbon form Peganum Harmala and compare the...
Volume Seven 1-1 ABSTRACT The removal of chromium, a highly toxic metal causing environmental pollution from dilute aqueous solution, was studied in the present work using growing and washed cells of a mutant strain of Bacillus cereus (M16) isolated from tannery waste. Particularly, the effects of pH, temperature, metal ion concentration and contact time on removal of chromium were studied. Abo...
Background and Aim: Hexavalent chromium is a metal, which causes harmful effects in surface and ground water, Its removal from contaminated water and waste water has received a great deal of interest in recent years. Thus, theaim of the presentstudy was a comparative analysis of the application of green almond hull and its resultant ash inremovingchromium from aqueous solutions. Materials and M...
This study illustrates the process of removal of chromium from chrome tanning waste-water by fly ash which was drive from chrome shaving dust. This experiment was carried out in a batch process with laboratory prepared adsorbent samples and chrome tanning water collected from local tanneries. The influence of various factors likes adsorbent doses, contact time, and initial concentration of chro...
Background and purpose: Presence of heavy metals in water resources is of great concerns due to adverse effects on human health. The aims of this study were to evaluate the efficiency of coagulation process using Polyaluminum Silicate Chloride (PASiC) in removal of hexavalent chromium and Cadmium from aqueous solutions and comparing that to the standards. Materials and methods: Experiments w...
the research aimed to apply the taguchi method for techno-economical evaluation of cr+6 removal using the electro-coagulation process with the aid of two different coagulants (fecl3 and pac). taguchi orthogonal array l27 (313) was applied for analyzing the effect of four variables including initial ph, reaction time, current density and coagulant types in an attempt to improve the chromium remo...
The research aimed to apply the Taguchi method for techno-economical evaluation of Cr+6 removal using the electro-coagulation process with the aid of two different coagulants (FeCl3 and PAC). Taguchi orthogonal array L27 (313) was applied for analyzing the effect of four variables including initial pH, reaction time, current density and coagulant types in an attempt to improve the chromium remo...
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