Development of adsorbent for the simultaneous removal of organic and inorganic contaminants from aqueous solution

2011 ◽  
Vol 64 (9) ◽  
pp. 1821-1827 ◽  
Author(s):  
J. W. Choi ◽  
S. G. Chung ◽  
S. W. Hong ◽  
D. J. Kim ◽  
S. H. Lee
Keyword(s):  
Industrial Wastewater ◽  
Inorganic Compounds ◽  
Langmuir Equation ◽  
Contaminated Groundwater ◽  
Batch Experiments ◽  
Inorganic Contaminants ◽  
Mixed Contaminants ◽  
Gel Beads ◽  
Synthetic Zeolites ◽  
Benzene Toluene

In this study, a modified adsorbent, alginate complex beads, was prepared and applied to the removal of mixed contaminants from wastewater. The alginate complex beads were generated by the immobilization of powdered activated carbon and synthetic zeolites onto alginate gel beads, which were then dried at 110 °C for 20 h until the diameter had been reduced to 1 mm. This dry technique increased the hardness of the adsorbent to assure its durability and application. The adsorption onto the alginate complex beads of organic and inorganic compounds, as target contaminants, was investigated by performing both equilibrium and kinetic batch experiments. From the adsorption isotherms, according to the Langmuir equation, the alginate complex bead was capable of effectively removing benzene, toluene, zinc and cadmium. From kinetic batch experiments, the removal efficiencies of benzene, toluene, zinc and cadmium were found to be 66.5, 92.4, 74.1 and 76.7%, respectively, for initial solution concentrations of 100 mg L−1. The results indicated that the adsorbent developed in this study has the potential to be a promising material for the removal of mixed pollutants from industrial wastewater or contaminated groundwater.

scholarly journals B-Cyclodextrin Polyurethanes Copolymerised with Beetroot Fibers (Bio-Polymer), for the Removal of Organic and Inorganic Contaminants from Water

2013 ◽  
Vol 2 (1) ◽  
pp. 150 ◽  
Author(s):  
Jamil Rima ◽  
Karine Assaker
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Polycyclic Aromatic Hydrocarbons ◽  
Water Treatment ◽  
Aromatic Hydrocarbons ◽  
Rhodamine B ◽  
Industrial Wastewater ◽  
Contaminated Groundwater ◽  
Inorganic Contaminants ◽  
Polycyclic Aromatic

<p>In this study, B-Cyclodextrinn polymerized with beetroot fibers (Bio-polymer), was prepared and applied to the removal of organic and inorganic contaminants from wastewater. An investigation into the use of cross-linked cyclodextrin polyurethanes copolymerised with beetroot fibers as adsorbents for organic pollutants and heavy metals has yielded very useful results which may have an impact in future water treatment applications.</p> The Biopolymer was tested in water contaminated by dyes, polycyclic aromatic hydrocarbons (PAH) and heavy metals. The effectiveness to eliminate dyes such as methylene blue and Rhodamine B with concentrations around 100 ppm was more than 99%, while the pyrene,which was chosen as an example among PAHs, showed a potential of elimination exceeding the 97% for solutions of 10 ppm. Also, heavy metals, such as Lead, Zn, and Cu, were tested and showed an efficacy exceeding the 99.8%. The results indicated that the biopolymer developed in this study has the potential to be a promising material for the removal of mixed pollutants from industrial wastewater or from contaminated groundwater.

scholarly journals Applying EFDC Explorer model in the Gallinas River, Mexico to estimate its assimilation capacity for water quality protection

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Claudia Villota-López ◽  
Clemente Rodríguez-Cuevas ◽  
Franklin Torres-Bejarano ◽  
Rodolfo Cisneros-Pérez ◽  
Rodolfo Cisneros-Almazán ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Industrial Wastewater ◽  
Socioeconomic Development ◽  
Inorganic Compounds ◽  
Organic Content ◽  
Phosphorus Compounds ◽  
Active Components ◽  
Nitrogenous Substances ◽  
Efficient Recovery ◽  
Assimilation Capacity

AbstractSanitary and industrial wastewater discharged into rivers, is a general problem that occurs in most of the world and Mexico is not the exception, the main goal of this research is to determine based on simulations of pollutants concentrations, the assimilation capacity of the Gallinas River against discharges of agricultural and industrial wastewater from the cultivation and processing of sugar cane under two different hypothetical simulation scenarios, based on reproducing two well know scenarios. In sugarcane cultivation, large quantities of fertilizers are used whose main active components are based on nitrogen or phosphorus compounds, therefore, the wastewater resulting from sugarcane processing contains a high organic content from 20 to 40% of inorganic compounds, such as nitrogenous substances, organic acids, and phosphorous sulfates. For this reason, the physical–chemical variables of interest analyzed in this work are the PO$$_4$$ 4 (phosphate), NO$$_3$$ 3 (nitrate), and DO (dissolved oxygen). With the simulation results according to each scenery, it can be determined, that despite the continuous discharge of polluting elements, the Gallinas River has a good assimilation capacity thanks to reaeration processes that permit efficient recovery of the dissolved oxygen in the water column. Gallinas River is located in the region known as the Huasteca Potosina, this investigation is relevant for the region due to the River is of vital importance being the main tributary that allows socioeconomic development activities in this zone. To carry out the simulations, was used the Explorer Modeling System 8.4 (EFCD) model and was performed two samplings campaign along 15 km in the water body to calibrate the numerical model to represent the dry and wet seasons during May and September respectively named as calibration scenarios.

scholarly journals The adsorption of vapours on mercury. I. Non-polar substances

1946 ◽  
Vol 187 (1008) ◽  
pp. 53-73 ◽  
Keyword(s):  
Free Energy ◽  
Total Energy ◽  
Langmuir Equation ◽  
Phase Changes ◽  
Two Dimensional ◽  
Surface Phase ◽  
Standard State ◽  
Spreading Pressure ◽  
Benzene Toluene ◽  
Entropy Of Adsorption

Reversible results for the adsorption of benzene, toluene and n -heptane vapours on mercury have been obtained. The films were found to be gaseous and obeyed the Volmer eqution F ( A - b ) = kT , where F = spreading pressure, A =area per molecule and b = co-area. The possibility that the films might be immobile was considered and the Langmuir equation was applied but found unsatisfactory. A standard state for the surface phase was defined and the free energy, total energy and entropy of adsorption evaluated. The heat of adsorption was shown to increase with the amount on the surface. A number of phase changes were found to occur after the completion of monolayer adsorp­tion, the most striking being interpreted as the change over from ‘flat’ to ‘vertical’ adsorp­tion of the toluene molecules. Others were thought to be either two-dimensional condensation or adsorption of a second layer.

Screening reactive materials as permeable barriers to treat lead and benzene contaminated groundwater

2015 ◽  
Vol 15 (3) ◽  
pp. 632-641 ◽  
Author(s):  
Franklin Obiri-Nyarko ◽  
Jolanta Kwiatkowska-Malina ◽  
Tomasz Kasela
Keyword(s):  
Brown Coal ◽  
Diatomaceous Earth ◽  
Deionized Water ◽  
Contaminated Groundwater ◽  
Contaminant Removal ◽  
Batch Experiments ◽  
Reactive Materials ◽  
Exchangeable Fraction ◽  
Permeable Barriers ◽  
Removal Efficiencies

Laboratory batch experiments were performed to: (i) select two individual and two mixtures of potential reactive materials for permeable barriers to treat groundwater contaminated with benzene and soluble lead (Pb2+); (ii) investigate the involved contaminant removal mechanisms; and (iii) determine the permeability and assess the environmental compatibility of the selected materials. Five individual reactive materials (zeolite, diatomaceous earth, brown coal, compost, and zero-valent iron as control) and four mixtures (compost:brown coal, compost:zeolite, compost:mulch, and mulch:diatomaceous earth) in different ratios were investigated. Benzene and Pb2+ were investigated separately using Pb2+/benzene spiked deionized water. Zeolite and brown coal were selected as individual materials for Pb and benzene based on their removal efficiencies. For the material mixtures, compost:brown coal (1:3) and compost:zeolite mixtures (1:3) were selected for Pb, whereas compost:zeolite (1:1) and compost:brown coal (1:5) were selected for benzene. The sequential extraction of Pb from these selected reactive materials showed that Pb was held mainly in the exchangeable fraction (52%–76%). Benzene was removed by biodegradation and sorption, with the latter contributing most to its removal (60%–99%). The selected materials were compatible with the environment considering the amounts of toxic metals leached from them, and their permeabilities were in the range of 4.2 × 10−5–2.14 × 10−3 m s−1.

scholarly journals STUDI KARAKTERISTIK BIOPOLIMER GRACILARIA VERRUCOSA SEBAGAI BAHAN PENJERAP

2012 ◽  
Vol 10 (2) ◽  
pp. 85
Author(s):  
Dessy Ariyanti ◽  
Intan Nurcahyani
Keyword(s):  
Heavy Metals ◽  
Trace Elements ◽  
Industrial Wastewater ◽  
Langmuir Equation ◽  
Gracilaria Verrucosa ◽  
Adsorption Ability ◽  
Biosorption Capacity ◽  
Biosorption Process ◽  
Alternative Material ◽  
Equilibrium Data

ABSTRAK Keberadaan logam berat Cu dalam limbah industri dapat berakibat buruk bagi lingkungan. Gracilaria verrucosa ditujukan sebagai bahan alternatif yang ramah lingkungan pengganti polimer sintetis untuk proses biosorpsi logam berat Cu. Pada penelitian ini dipelajari karakteristik kemampuan penjerapan dari biopolimer Gracilaria verrucosa terhadap logam berat Cu. Pada proses biosorpsi Cu2+ kapasitas biosorpsi maksimum sekitar 38.34 mg/gr. Kapasitas biosorpsi dicapai pada t=15 menit dan pH larutan= 4. Data kesetimbangan proses biosorpsi ini dapat dimodelkan dengan persamaan Langmuir. Keberadaan NH4+ dalam larutan tidak terlalu berpengaruh terhadap proses biosorpsi logam berat Cu. Hasil penelitian disimpulkan bahwa biopolimer Gracilaria verrucosa memiliki potensi sebagai bahan alternatif dalam proses pemisahan trace element dengan kapasitas biosorpsi yang tinggi. Kata kunci : Gracilaria verrucosa, alga merah, biosorpsi  logam berat ABSTRACT The presence of heavy metals such as Cu in industrial wastewater can lead to the environment contamination. The algae Gracilaria verrucosa is intended to be the environmentally friendly polymer used in biosorption process of heavy metals Cu. In this research, the characteristics and adsorption ability of biopolymers Gracilaria verrucosa against heavy metals Cu was studied respectively. Results shown that the maximum biosorption capacity of Gracilaria verrucosa in adsorbing Cu2+ was 38.34 mg/gr at t = 15 min and pH = 4. Equilibrium data of biosorption process can be modeled by Langmuir equation. The presence of NH4 + in solution does not significantly affected the biosorption process of heavy metals Cu. It can be concluded that biopolymer Gracilaria verrucosa has potential as an alternative material with high biosorption capacity in removing trace elements. Keywords: Gracilaria verrucosa, red algae, heavy metals biosorption

scholarly journals Isolation and characterization of hydrocarbon-degrading bacteria from gas station leaking-contaminated groundwater in the Southern Amazon, Brazil

2020 ◽  
Vol 80 (2) ◽  
pp. 354-361 ◽  
Author(s):  
S. D. Lima ◽  
A. F. Oliveira ◽  
R. Golin ◽  
V. C. P. Lopes ◽  
D. S. Caixeta ◽  
...  
Keyword(s):  
Contaminated Groundwater ◽  
Rrna Gene ◽  
Bacillus Sp ◽  
Alkane Hydroxylase ◽  
Gene Group ◽  
Group Iii ◽  
Isolation And Characterization ◽  
Degrading Bacteria ◽  
Benzene Toluene ◽  
Gas Station

Abstract Twenty-three hydrocarbon-degrading bacteria strains were isolated from gas station leaking-contaminated groundwater located in the Southern Amazon, Brazil. Based on hydrocarbon (diesel, hexadecane, benzene, toluene and xylene) degradation ability, two strains were selected for further study. The amplification and sequencing of the 16S rRNA gene showed that these two strains belonged to the genus Bacillus (Bacillus sp. L26 and Bacillus sp. L30). GC-MS analysis showed that strain L30 was the most effective in degrading n-alkane (C10-C27) from diesel after 7 days of cultivation in mineral medium. Both strains produced biosurfactants and showed emulsification activity, specially the strain L30. Alkane hydroxylase gene (group III), which is important for alkane biodegradation, was present in strains. As a result, this study indicated that these bacteria could have promising applications in hydrocarbon bioremediation.

Microbial degradation of benzene, toluene, ethylbenzene and xylene isomers (BTEX) contaminated groundwater in Korea

2001 ◽  
Vol 44 (7) ◽  
pp. 165-171 ◽  
Author(s):  
S. W. Chang ◽  
H. J. La ◽  
S. J. Lee
Keyword(s):  
Potent Inhibitor ◽  
Inhibitory Effect ◽  
Contaminated Groundwater ◽  
Interaction Patterns ◽  
Contaminated Aquifer ◽  
Substrate Interaction ◽  
Substrate Degradation ◽  
Benzene Toluene ◽  
Xylene Isomers ◽  
Btex Compounds

A mixed culture derived from a gasoline-contaminated aquifer in Korea was enriched on toluene at 25°C. A study was conducted to characterize the substrate interaction of BTEX by toluene-enriched consortia and determine the effects of initial BTEX concentration on BTEX degradation. Substrate degradation patterns in individual aromatics were found to differ significantly from patterns for aromatics in mixtures. In the experiment of a single substrate, toluene was degraded fastest, followed by benzene, ethylbenzene, and the xylenes. In BTEX mixtures, degradation followed the order of toluene, ethylbenzene, benzene, and the xylenes. The studies conducting with toluene-enriched consortia evaluated substrate interactions by the concurrent presence of multiple BTEX compounds and revealed a range of substrate interaction patterns including no interaction, stimulation, inhibition, and cometabolism. The simultaneous presence of benzene and toluene were degraded with a slight inhibitory effect on each other. Ethylbenzene was shown to be the most potent inhibitor of BTEX degradation. p-xylene also inhibited the degradation of benzene, toluene, and ethylbenzene, whereas the presence of either benzene or toluene enhanced the degradation of ethylbenzene and the xylenes.

Plant-endophyte synergism in constructed wetlands enhances the remediation of tannery effluent

2018 ◽  
Vol 77 (5) ◽  
pp. 1262-1270 ◽  
Author(s):  
Sobia Ashraf ◽  
Muhammad Afzal ◽  
Khadeeja Rehman ◽  
Muhammad Naveed ◽  
Zahir Ahmad Zahir
Keyword(s):  
Industrial Wastewater ◽  
Bacterial Population ◽  
Ecological Engineering ◽  
Tannery Effluent ◽  
Inorganic Contaminants ◽  
Bacterial Strains ◽  
Severe Damage ◽  
Similar Reduction ◽  
Combined Action ◽  
Brachiaria Mutica

Abstract Liquid effluent produced from tanning industries is loaded with organic and inorganic contaminants, particularly heavy metals, which may cause severe damage to the ecosystem. Constructed wetland (CW) is a promising product of the research in the field of ecological engineering which helps to overcome aquatic pollution. This investigation aims to develop a plant–endophyte synergism in CW for the efficient remediation of tannery effluent. In a vertical flow CW, Brachiaria mutica was vegetated and augmented with three endophytic bacterial strains. Results showed a reduction of 82% in COD, 94% in BOD5, and 95% in Cr by plant–endophyte synergism in CWs and it was significantly higher than the use of plants alone. Similarly, nutrients (N and P), lipids, ion content, SO42−, and Cl− showed similar reduction by the combined action of endophytes and B. mutica in CWs. The endophytes inoculation enhanced bacterial population in different compartments of the plants vegetated in CWs and the maximum was observed in the roots. This study revealed that plant–endophyte synergism in CWs can enhance the remediation of industrial wastewater.

scholarly journals High performance activated carbon for benzene/toluene adsorption from industrial wastewater

2011 ◽  
Vol 192 (3) ◽  
pp. 1525-1532 ◽  
Author(s):  
Natalia G. Asenjo ◽  
Patricia Álvarez ◽  
Marcos Granda ◽  
Clara Blanco ◽  
Ricardo Santamaría ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Industrial Wastewater ◽  
High Performance ◽  
Benzene Toluene

scholarly journals Natural Zeolites of Eastern Transbaikalia in Technologies for Mining Enterprises Wastewater Treatment

2020 ◽  
Vol 76 (3) ◽  
pp. 62-70
Author(s):  
Konstantin Razmakhnin ◽  
Vitaliy Vitalievich Milyutin ◽  
Alisa Nikolaevna Khatkova ◽  
Nataliya Anatolevna Nekrasova
Keyword(s):  
Exchange Rate ◽  
Industrial Wastewater ◽  
Natural Waters ◽  
Natural Zeolites ◽  
Adsorption Interaction ◽  
Cesium Radionuclides ◽  
Eastern Transbaikalia ◽  
Synthetic Zeolites ◽  
The Impact ◽  
Sorption Characteristics

The possibilities of conditioning acidified wastewater from mining enterprises by natural zeolites of deposits in East Transbaikalia were studied. Sorption characteristics of various natural and synthetic zeolites in relation to strontium and cesium radionuclides were determined to evaluate the possibility of their application for the purification of radioactively contaminated technogenic and natural waters. The ability of natural zeolites to selectively adsorb the heavy metal ions was investigated. An experimental study was made on the possibility of neutralizing acidic media with zeolites. The kinetic dependencies were obtained to evaluate the ion exchange rate on the natural zeolites. The impact of exchanging cations and the defining mineral’s structure on the exchange rate was studied. The instantaneous adsorption interaction rate values were determined. The possibility of 90Sr and Ca2+ ions sorption from the simulated solutions of industrial wastewater was investigated.

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