Obtaining a bioadsorbent from orange peel suitable for batch and continous treatment

One form of chemical contamination involves the contribution of heavy metals to the ecosystem mainly from industrial spills and mining operations. The most toxic heavy metals are cadmium, copper, chromium, mercury, nickel, lead and zinc. The importance of this type of toxic lies in the tendency to be accumulated and concentrated by the different species, being more dangerous as it ascends the evolutionary chain towards man.Chemical precipitation is the most widely used technique for metal recovery. This process is conditioned by the pH, metal concentration and anions present in the water to be treated.Bioadsorption is considered a viable alternative to the physico-chemical methods currently used for the recovery or removal of heavy metals dissolved in liquid effluents. Its main attractiveness, from an industrial point of view, is its low cost dueto the great abundance, easy obtaining and low price of the bioadsorbent material. Bioadsorption is very effective in the treatment of metal concentrations below 100 mg/L, where the application of physical-chemical methods is not technically and economically feasible.One of these materials of interest is orange peelsbecause, due to their abundance as a waste product of the food industries, they have problems for their disposal and currently have little economic value. However, this residue has a low adsorption capacity, so both physical and chemical modifications arerequired to increase its adsorption properties.The objective of this work has been to optimize the treatment of orange peel intended to obtain a bioadsorbent that allows the removal of heavy metals both in a discontinuous process (Batch) and in an ongoing process. The verification of the characteristics of the bioadsorbent obtained has been carried out with a series of synthetic solutions of Cu (II).The particle size and consistency of the final bioadsorbent has been optimized. In addition, to achieve a homogeneous elution in the continuous process, additional heat treatment has been necessary to prevent the development of microorganisms in a period of time less than one week.Peer ReviewedPostprint (published version

Zinc, nickel,andcobaltionsremovalfrom aqueoussolutionandplatingplantwastewater bymodified Aspergillus flavus biomass: Adataset

The biomassof Aspergillus flavus wasmodified bycalciumchloride to achieveabioadsorbentfortreatingnickel,cobalt,andzincions from aqueoussolutions.TheinformationofpH,bioadsorbentdose, contact time,andtemperatureeffectontheremovalefficiency are presented.ThedataofFreundlichandLangmuirisothermand pseudo-first-orderandpseudo-second-orderkineticmodelsare also depicted.Thedatashowedthatthemaximumbioadsorption capacity ofnickel,cobalt,andzincionsis32.26,31.06and 27.86mg/g,respectively.Thesuitabilityofthebioadsorbentin heavymetalsremovalat field conditionwastestedwithareal wastewatersamplecollectedfromaplatingplantinthe final part of thisdataset.Basedonthe findings, thebioadsorbentwasshown to beanaffordablealternativefortheremovalofmetalsinthe wastewater

Application of citrus bioadsorbents as wine clarifiers

In recent years, reuse and recycling has taken on an increasingly important role in our society. As a result, there has been an increase in research and development of sustainable technologies. The experience acquired by the CRESCA team in the study of the revaluation of orange peels and lemon have allowed him to have a vision of this by-product as a raw material that, with the opportune treatments, can be origin of products of high added value. In this sense, very satisfactory results have been achieved for different fields of application such as: a) Agricultural: As water adsorbents, obtaining better results than conventional products (silica gel). b) Wine: As an alternative wine clarifier to products currently used (gelatin, potato protein, egg albumin, etc.) c) Treatment of wastewater with high metallic load: As heavy metal adsorbents (Ni, Cu, Pb, etc.) d) Wastewater Treatment of textile industry: as adsorbent of organic dyes. This paper proposes the use of orange peel and lemon, after being subjected to a process physicochemical, as clarifiers of wine and compared the results with those obtained with vegetable protein, gelatin and bentonitePostprint (published version

Adsorption of Heavy Metal Cr (VI) Using BioSorbent of Tea Dregs: Experimental and Modeling

Tea plants have been generally known by most of Indonesian as a refreshing drink. Tea leavesusually contain caffeine of 1-4%, tannins of 7-20% and a little essential oil. Powder of tea dregs has the ability to absorb heavy metal of chromium. The research objective was to study the adsorption kinetics of heavy metal ions of Cr (VI) using powder of tea dregs and to study factors that affect adsorption process of chromium metal. The analysis of sample solution concentration of Cr (VI) in this study was using Atomic Absorption Spectrophotometer (AAS). The effect of various process variables such as initial concentration of the metal solution, stirrer speed and concentration of modifying agent of sulphuric acid has been investigated. The results showed that the optimum adsorption process was obtained at adsorbate concentration of 125 ppm with activation process at sulphuric acid concentration of 0.8 M. The highest efficiency of heavy metal adsorption reached 83.24% with adsorption capacity of 5.202925 mg/g bio-sorbent. This adsorption was in accordance with the Langmuir Isotherm models with R2 value of 0.909. This study was also in accordance with kinetics of a second pseudo order with a R2 value of 0.997 and K of 0.752 g/mg. Minut

Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution

How to effectively remove toxic dyes from the industrial wastewater using a green low-cost lignocellulose-based adsorbent, such as lignin, has become a topic of great interest but remains quite challenging. In this study, cosolvent-enhanced lignocellulosic fractionation (CELF) pretreatment and Mannich reaction were combined to generate an aminated CELF lignin which is subsequently applied for removal of methylene blue and direct blue (DB) 1 dye from aqueous solution. 31P NMR was used to track the degree of amination, and an orthogonal design was applied to determine the relationship between the extent of amination and reaction parameters. The physicochemical, morphological, and thermal properties of the aminated CELF lignin were characterized to confirm the successful grafting of diethylenetriamine onto the lignin. The aminated CELF lignin proved to be an effective azo dye-adsorbent, demonstrating considerably enhanced dye decolorization, especially toward DB 1 dye (>90%). It had a maximum adsorption capacity of DB 1 dye of 502.7 mg/g, and the kinetic study suggested the adsorption process conformed to a pseudo-second-order kinetic model. The isotherm results also showed that the modified lignin-based adsorbent exhibited monolayer adsorption. The adsorbent properties were mainly attributed to the incorporated amine functionalities as well as the increased specific surface area of the aminated CELF lignin

Dyes adsorption from aqueous solutions by Chitosan

In this study the ability of chitosan to remove acid, basic, reactive and direct dyestuffs by adsorption was studied. The effect of several factors influencing dye adsorption such as dye concentration, grain size, pH and temperature were investigated. Desorption of dyes at different pH was also examined. It was shown that the adsorption capacities of chitosan were comparatively high for acid and direct dyes and that the adsorption was controlled by the acidity of the solution. The kinetics of adsorption were found to be of pseudo second order. Batch isotherm studies showed that adsorption of dyes from aqueous solution by chitosan was described by the Langmuir equation

Reduction of 4-ethylphenol concentration using lyophilized yeast biomasses as bioadsorbent: influence on the anthocyanin contents and chromatic parameters

A new investigation trend, based on the parietal adsorption activity showed by yeast cellwalls, opens up the possibility to use yeast lees or derived products like inactive dry yeast preparations to reduce 4-ethylphenol concentrations in wines. These type of natural products entails an interesting eco-friendly alternative to common physical treatments. In this work the bioadsorption capacity of 4-ethylphenol of different wine yeast biomasses have been studied -Saccharomyces cerevisiae G37 and Schizosaccharomyces pombe 936-, in order to diminish the negative impact on the sensorial profile of this type of compound (Figure 1). the repercussions of this palliative treatment over the chromatic properties and anthocyanin concentration have also been studied by means of UV-Vis and HPLC-PDAD/ESI-MS analysi

GENERATION OF BACILLUS SUBTILIS CLONE DISPLAYING METAL-BINDING POLYHISTIDYL PEPTIDE

Joint Research on Environmental Science and Technology for the Eart

BIOSORPTION OF TECHNICAL DIRECT DYES BY ACTIVATED SLUDGE

This study aimed to determine the effect of adsorbent mass, adsorption time and concentration of dye on adsorption efficiency of activated sludge toward technical direct dyes and to know the effect of the adsorption process of the COD (Chemical Oxygen Demand) value in technical direct dyes solution. The subject of this study was activated sludge. The object of this study was the activated sludge adsorption efficiency on technical direct dyes. Adsorption process was done by conditioning the variation of the mass of adsorbent, adsorption time and concentration of technical direct dyes. Technical direct dyes solution before and after adsorption were quantitatively analyzed with a COD reactor. Technical direct black dyes solution after adsorption were analyzed quantitatively by UV-Vis spectrophotometer. Adsorption efficiency expressed in terms of concentration of adsorbed dyes divided by the initial concentration of dye solution and multiplied by 100%. The results showed that: the greater the mass of adsorbent, the higher the adsorption efficiency of activated sludge to technical direct dyes, the longer the time given to the process of adsorption, the higher the adsorption efficiency of activated sludge to technical direct dyes, adsorption efficiency decreases with increasing concentration of technical direct dyes, chemical Oxygen Demand (COD) value technical direct were decrease after adsorption process by activated sludge

Вопросы оптимизации процесса удаления ионов тяжелых металлов с использованием модифицированных биоадсорбентов

Одним из широко распространенных методов очистки среды от ионов тяжелых металлов является использование биоадсорбентов. Проведена оптимизация технологического цикла биоадсорбции ионов тяжелых металлов. Показано, что физико – химические особенности процесса биоадсорбции позволяет выбрать такую рабочую точку технологического процесса при котором могут быть достигнуты минимальные расходы, затрачиваемые на приобретение адсорбента и модификатора. Осуществлена оптимизация серии процессов биоадсорбции тяжелых металлов с помощью в различной степени модифицированных биоадсорбентов. Найдено условие при выполнении которого общий процент удаленных ионов тяжелых металлов достигает максимума. Проведенные экспериментальные исследования подтвердили общие закономерности зависимости основных характеристик процесса биоадсорбции от концентрации адсорбента, которые легли в основу предложенной процедуры оптимизации процесса очистки ионов тяжелых металлов с помощью модифицированных биоадсорбенто