Abstract
Orthogonal experiment optimization of adsorption conditions with the factors of pH value, adsorption time, adsorbent amount of Cr(VI) wastewater by amine surfactant Modified Brewer's Grains (MBSG) in food industry were studied. The results showed that optimum adsorption conditions were as follows: 100 mL Cr(VI) ions solution of 250 mg/L, adding 2.0 g/L brewer's grains of 60~80 mesh and adsorbed for 1.0 h, adsorbent temperature 30°C, pH 3.0. Under the optimal conditions, the maximal absorption rate got 90.18% and adsorption capacity was 111.95 mg/g. The modified MBSG is a promising, cheap, efficient, new biological materials of adsorption for Cr(VI) in wastewater.
Highlights
Chromium is one of the most toxic elements and is widely present in the form of chromium (VI) in wastewater (Wang et al, 2008)
Orthogonal experiment optimization of adsorption conditions: With less test times, high efficiency, simple calculation and other advantages, the orthogonal test design has been widely applied in many research fields of medical, industrial production etc (Taguchi, 1987; Ma et al, 2000)
Adsorption experiment: 100 mL 250 mg/L Cr(VI) solution were placed in 250 mL conical flask and adjusted the pH to 2.0, added the Modified Brewer's Grains (MBSG) of 2.0 g/L, the bottles were settled in constant warm water shaker of 30°C and shaken for 2 h, the grains and solution were separated by a filter, the solution were centrifuged at 5000 r/min to separated the particles and the residual Cr(VI) concentration in the filtrate was determined
Summary
Chromium is one of the most toxic elements and is widely present in the form of chromium (VI) in wastewater (Wang et al, 2008). The conventional methods for treatment of chromium (VI) wastes include: chemical precipitation, electrolysis, activated carbon adsorption, reverse osmosis, ion exchange, etc (Liu, 2012). These techniques have limitations, often are neither effective nor economical especially for the removal of heavy metals at low concentrations and often generate chemical sludge, whose disposal is problematic. Many researchers have been actively seeking cost-effective materials to adsorb Cr(VI) ions for wastewater purification (Shen and Xu, 2010). Brewer's Grains (BSG) is the main by-product of beer industry. It is produced in large quantities yet lacks effective utilization. For utilizing the BSG as the low cost material for Cr(VI) wastewater purification, the adsorption conditions was studied using orthogonal test of the adsorption rate and adsorption amount as index, the results would be the theoretical basis for the comprehensive utilization of the material
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
