scholarly journals REMOVAL OF COLOR FROM INDUSTRIAL EFFLUENTS BY ADSORPTION USING UNMODIFIED AND SURFACTANT-MODIFIED ZEOLITE FROM CYCLONE ASH

2014 ◽  
Vol 12 (24) ◽  
pp. 7-14
Author(s):  
Denise Alves FUNGARO ◽  
Sueli Ivone BORRELY ◽  
Marcela HIGA
Keyword(s):  
Manufacturing Industry ◽  
Low Cost ◽  
Industrial Effluents ◽  
Textile Wastewater ◽  
Color Removal ◽  
Hexadecyltrimethylammonium Bromide ◽  
Modified Zeolite ◽  
Ph Values ◽  
Brazilian Legislation ◽  
Treated Effluent

Treatment of wastewater is one of the biggest problems faced by textile and dyestuff manufacturers. The purpose of the present study was to investigate the suitability of using zeolitic materials as low cost media for removal of color from dye effluents. Zeolite synthesized from cyclone ash (ZCA) was modified with hexadecyltrimethylammonium bromide and the adsorption efficiencies for unmodified and surfactant-modified zeolite (SMZCA) were studied using a batch equilibration method. SMZCA presented higher color removal efficiency than ZCA, removing 60-100% of color for textile effluents and around 39% for effluent of dyestuff manufacturing industry. The effects of dilution on color removal were evaluated. The pH values of the treated effluent were according to the Brazilian legislation. It can be concluded that surfactant modified-zeolite from cyclone ash is a promising low-cost adsorbent for color removal from textile wastewater.

Removal of Reactive Dyes by Sorption/Complexation with Cucurbituril

1999 ◽  
Vol 40 (4-5) ◽  
pp. 425-433 ◽  
Author(s):  
S. Karcher ◽  
A. Kornmüller ◽  
M. Jekel
Keyword(s):  
Wastewater Treatment ◽  
Ph Effect ◽  
Reactive Dyes ◽  
Textile Wastewater ◽  
Color Removal ◽  
Salt Solutions ◽  
Technical Application ◽  
Ph Values ◽  
Hydrophobic Cavity ◽  
Textile Wastewater Treatment

Color removal is an important task in textile wastewater treatment. Cucurbituril, a cyclic hexamer with internal hydrophobic cavity, has been studied as sorbent for removal of reactive dyes. Loadings as high as 1 g/g and more were obtained, making the method seem interesting for technical application. A minimum of 1 to 5 mmol/L calcium is needed for efficient sorption. However, salt concentrations of 100 mmol/L and above decrease sorption efficiency due to increased solubility of cucurbituril in salt solutions. The pH has little influence between 4 and 7.5, higher pH-values can result in decreased sorption. The salt influences are similar for most of the tested dyes whereas the pH-effect differs from dye to dye.

ON-LINE MONITORING AND CONTROL OF THE TEXTILE WASTEWATER COLOR REMOVAL PROCESS

1994 ◽  
Vol 30 (3) ◽  
pp. 265-274 ◽  
Author(s):  
Cheng-Nan Chang ◽  
Ruey-Fang Yu ◽  
Allen C. Chao ◽  
Seishu Tojo
Keyword(s):  
Oxidation Process ◽  
Textile Wastewater ◽  
Cost Effective ◽  
Color Removal ◽  
Laboratory Studies ◽  
Monitoring And Control ◽  
Solution Ph ◽  
Treated Effluent ◽  
On Line ◽  
Time Required

On-line monitoring of the wastewater color and ORP values is used to carry out laboratory studies for collecting data to assist in formulating model equations that can be used to achieve better control and automation of the oxidation process for color removal from textile finish wastewaters. Laboratory studies show that the ORP value, the solution pH, the chemical dosage applied and the resulting color of the treated samples are well correlated by linear relationships. Additionally, the ORP value of the solution that is highly related to the color or the ADMI value of the sample being oxidized can be used as a control parameter of the oxidation process. Nernst equation is modified to generalize the findings and the reaction kinetics can be delineated by Ct = In (ADMIo/ADMIt). The term Ct is a function of ORP, pH and reaction time while ADMIt and ADMI, are the color of the raw wastewater and the treated effluent, respectively. Using the model, the dosage requirement, the color removal efficiency, and the time required to complete the oxidation reaction can be calculated. On-line monitoring and automatic control of the de-coloring process to achieve a more efficient and better cost-effective color removal can be made practical.

Natural clay from Cuba for environmental remediation

Clay Minerals ◽  
2018 ◽  
Vol 53 (2) ◽  
pp. 193-201 ◽  
Author(s):  
S. A. Martín ◽  
L. Valdés ◽  
F. Mérida ◽  
L. C. de Ménorval ◽  
M. Velázquez ◽  
...  
Keyword(s):  
Environmental Remediation ◽  
Low Cost ◽  
Industrial Effluents ◽  
Xrd Analysis ◽  
Natural Clay ◽  
X Ray Diffraction ◽  
Experimental Conditions ◽  
Ph Values ◽  
Natural Clays ◽  
Adsorptive Properties

ABSTRACTThe use of natural clays for the removal of dyes from wastewater, an important part of environmental remediation, is desirable due, not least, to their low cost. Palygorskite (PAL), a rigid-structure clay, is a good candidate for use in the elimination of industrial effluents, based on its exceptional adsorptive properties. Recently, a new palygorskite deposit has been discovered in Cuba and its use in the adsorption of dyes has not yet been explored in detail. In the present study, the use of unmodified natural Cuban palygorskite as a host for dyes was evaluated. Congo red (CR) and methylene blue (MB) were the anionic and cationic dyes tested, respectively, because of their wide use and toxicity to the environment. Several physical-chemical parameters were studied in order to establish the best experimental conditions under which to achieve the greatest dye load per gram of clay. Natural mixtures with different percentages of montmorillonite were also tested to evaluate their effect on the adsorption of the dyes. The results indicated that at pH values of ~7–9 and an initial dye concentration of 0.1 mg mL–1, the process was efficient. X-ray diffraction (XRD) analysis proved the surface adsorption of both dyes on the clays. The main interactions involved in the clay-dye system were electrostatic forces and H-bonds. Adsorption of CR seemed to be controlled fundamentally by the palygorskite phase. Such results support the use of this natural clay as an efficient host for the removal of MB and CR from wastewater.

scholarly journals Low-cost flow photoreactor for degradation of Reactive Black 5 dye by UV/H2O2, Fenton and photo-Fenton processes: a performance comparison

2021 ◽  
Vol 16 (3) ◽  
pp. 1
Author(s):  
Andrea Maria da Silva ◽  
Tainá Natália dos Santos ◽  
Raiane dos Santos ◽  
Thiago Sabino Pessoa ◽  
Luiz Carlos Araújo dos Anjos ◽  
...  
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Textile Wastewater ◽  
Performance Comparison ◽  
Operating Conditions ◽  
Color Removal ◽  
Reactive Black 5 ◽  
Order Kinetic ◽  
Fenton Process ◽  
Degradation Rates

In this work, a flow photoreactor was designed and set up using low-cost and recyclable parts to develop chemical treatments based on advanced oxidation processes (AOP) of highly colored textile wastewater. To evaluate this sustainable system´s efficiency, we investigated and compared the performance of three types of destructive methods (UV/H2O2, Fenton, and photo-Fenton) on the decolorization of aqueous solutions of Reactive Black 5 dye (RB5). We also analyzed the effect of the oxidant and dye concentrations on the rate of color removal in each one of the three methods. The results showed that, regardless of the initial operating conditions, the photo-Fenton process achieved the highest degradation rates, particularly when the highest ratio between the oxidant and dye concentrations was used ([H2O2]: [RB5] = 24.5 mg L-1: 25 mg L-1), leading to complete color removal within only 10 minutes of reaction. With the same initial condition, the Fenton and UV/H2O2 processes were also capable of removing the color entirely, even though they demanded more extended runs of 25 min. and 45 min., respectively. The effect of pH on the decolorization by the photo-Fenton process was also investigated, showing the same high performance at pHs 3 and 4. The degradation profile achieved by the photo-Fenton treatment was appropriately fitted by a pseudo-first-order kinetic. The non-expensive photoreactor proved to be quite useful for the degradation of the RB5, mainly when this azo dye underwent the photo-Fenton process.

scholarly journals Synthesis and Performance Evaluation of Chitosan/zinc Oxide Nanocomposite as a Highly Efficient Adsorbent in the Removal of Reactive Red 198 From Water

2021 ◽  
Author(s):  
Najmeh Amirmahani ◽  
Hakimeh Mahdizadeh ◽  
Neda Seyedi ◽  
Alireza Nasiri ◽  
Ghazal Yazdanpanah
Keyword(s):  
Zinc Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Low Cost ◽  
Industrial Effluents ◽  
Textile Wastewater ◽  
Secondary Compounds ◽  
High Adsorption ◽  
Reactive Red 198 ◽  
High Adsorption Capacity

Abstract Disposal of textile industrial effluents causes many environmental problems. The presence of chemical dyes in textile wastewater lead to the primary environmental pollution as well as the production of hazardous secondary compounds that are toxic and carcinogenic. In this study, Chitosan and Chitosan-zinc oxide (ZnO) nanocomposite were prepared and selected as a low-cost adsorbent with high adsorption capacity for removing reactive red 198 (RR 198) dye from contaminated. After preparation, it was characterized using Fourier-transform infrared spectroscopy [FT-IR], X-ray diffraction spectrophotometer [XRD], and scanning electron microscopy [SEM]. The effect of pH, temperature, time, adsorbent amount, and initial dye concentration were investigated in the removal efficiency of reactive red 198 (RR 198) dyes. The results showed that the maximum adsorption capacity (qm) obtained from the Langmuir equation was 172.41 mg/g in adsorbent dose of 0.1 g/L, pH: 4, temperature of 25°C, adsorption time of 40 min. The thermodynamic parameters demonstrated the spontaneous and endothermic nature of the adsorption process. Due to the high efficiency of chitosan/ZnO nanocomposite in removal of RR 198 from water and advantages such as high adsorption capacity, simple synthesis, and easy application, it can be used as an effective method in removal of RR 198 from water.

scholarly journals Color removal from textile wastewater using date seeds activated carbon

2017 ◽  
Vol 52 (1) ◽  
pp. 31-42
Author(s):  
MA Rahman ◽  
T Ahmed ◽  
IN Salehin ◽  
MD Hossain
Keyword(s):  
Activated Carbon ◽  
Adsorption Process ◽  
Dominant Role ◽  
Low Cost ◽  
Diffusion Mechanism ◽  
Textile Wastewater ◽  
Color Removal ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Removal Mechanism

Powdered Activated carbon (PAC) developed from date seeds was used as an adsorbent for the removal of color from textile wastewater. Batch adsorption experiments were performed in the laboratory with varying process parameters (temperature, pH, agitation, adsorbent dosage, particle size) over a range of contact periods and wastewater pollutant (color) levels. It was found that the removal mechanism could be better characterized by the Freundlich adsorption isotherm model compared to the Langmuir model. Also, The Lagergren's pseudo 2nd order kinetic model fitted relatively well ( = 0.99) over the selected range of contact times (5-60 minutes) and initial color concentrations (800-1200 Pt-Co unit) compared to the pseudo-first order model indicating that chemisorption may be playing a dominant role in the adsorption process. Both external film and intra-particle pore diffusion mechanism were involved in the adsorption process but film diffusion was found to be rate limiting. While analyzing the thermodynamics, the negative value of free energy (-1.83 to -3.4 KJ/mole), positive value of enthalpy (0.26 to 0.28 KJ/mole) and entropy (0.97 to 1.01 J/K/Mole) associated with the color removal mechanism indicated that adsorption was spontaneous and endothermic with increased disorder and randomness at the solid-liquid interface of the date seeds PAC. These experiments suggests that date seeds PAC is a very effective adsorbent, capable of removing a significant amount of color from industrial wastewater if process variables can be optimized and can be explored as a potential low-cost alternative to expensive tertiary treatment options.Bangladesh J. Sci. Ind. Res. 52(1), 31-42, 2017

Treatment of textile industry effluents using orange waste: a proposal to reduce color and chemical oxygen demand

2016 ◽  
Vol 74 (4) ◽  
pp. 994-1004 ◽  
Author(s):  
Carlos Eduardo de Farias Silva ◽  
Andreza Heloiza da Silva Gonçalves ◽  
Ana Karla de Souza Abud
Keyword(s):  
Chemical Oxygen Demand ◽  
Textile Industry ◽  
Adsorption Process ◽  
Low Cost ◽  
High Surface ◽  
High Surface Area ◽  
Dye Adsorption ◽  
Oxygen Demand ◽  
Textile Wastewater ◽  
Color Removal

Various agricultural residues have been tested as biosorbents due to their low cost, high surface area, and favorable surface chemistry. In this work, a sweet orange albedo was tested as a biosorbent for treatment of real textile effluents. The orange albedo powder was prepared by drying the residue at 50 °C and milling to 30 mesh, and then used for dye adsorption from a alkaline (pH = 10.71) effluent. The adsorption process was studied in batch experiments at 30 °C by measuring color removal and chemical oxygen demand (COD). The color removal was found not to be significantly altered when the effluent was used in its raw state, while COD increased probably due to albedo degradation. For the effluent diluted to 60% (Veffluent VH2O−1), color and COD removal percentages of approximately 89% were obtained. It was found that pH played a very significant role on the adsorption process, as the treated albedo displayed a relative pHPZC* of 4.61, and the highest dye removal efficiencies were reached at pH lower than 2. The COD was strongly influenced by the effluent dilution. The effectiveness in eliminating color and COD shows that orange albedo can be potentially used as a biosorbent to treat textile wastewater.

A New Alternative and Efficient Low-Cost Process for the Removal of Reactive Dyes in Textile Wastewater by Using Soybean Hull as Adsorbent

2021 ◽  
Vol 232 (5) ◽  
Author(s):  
Enrique David Victor Giordano ◽  
Maria Emilia Brassesco ◽  
Paola Camiscia ◽  
Guillermo Alfredo Picó ◽  
Nadia Woitovich Valetti
Keyword(s):  
Low Cost ◽  
Reactive Dyes ◽  
Textile Wastewater ◽  
Soybean Hull

scholarly journals Enhanced Oil Removal by a Non-Toxic Biosurfactant Formulation

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 467
Author(s):  
Emília Mendes da Silva Santos ◽  
Isabela Regina Alvares da Silva Lira ◽  
Hugo Moraes Meira ◽  
Jaciana dos Santos Aguiar ◽  
Raquel Diniz Rufino ◽  
...  
Keyword(s):  
Room Temperature ◽  
Low Cost ◽  
Aeration Rate ◽  
Oil Removal ◽  
Central Composite Rotatable Design ◽  
Chemical Methods ◽  
Ph Values ◽  
Spectroscopic Analyses ◽  
New Formulation ◽  
Central Composite

In this study, a new formulation of low-cost, biodegradable, and non-toxic biosurfactant by Candida sphaerica UCP 0995 was investigated. The study was conducted in a bioreactor on an industrial waste-based medium, and a central composite rotatable design was used for optimization. The best results, namely a 25.22 mN/m reduction in surface tension, a biosurfactant yield of 10.0 g/L, and a critical micelle concentration of 0.2 g/L, were achieved in 132 h at an agitation speed of 175 rpm and an aeration rate of 1.5 vvm. Compositional and spectroscopic analyses of the purified biosurfactant by chemical methods, Fourier transform infrared spectroscopy, and nuclear magnetic resonance suggested that it is a glycolipid-type biosurfactant, and it showed no cytotoxicity in the MTT assay. The biosurfactant, submitted to different formulation methods as a commercial additive, remained stable for 120 days at room temperature. Tensioactive properties and stability were evaluated at different pH values, temperatures, and salt concentrations. The biosurfactant obtained with all formulation methods demonstrated good stability, with tolerance to wide ranges of pH, temperature and salinity, enabling application under extreme environmental conditions. Bioremediation tests were performed to check the efficacy of the isolated biosurfactant and the selected microbial species in removing oil from soil. The results demonstrated that the biosurfactant produced has promising properties as an agent for the bioremediation of contaminated soil.

scholarly journals Mechanisms and adsorption capacities of biochar for the removal of organic and inorganic pollutants from industrial wastewater

2020 ◽  
Author(s):  
T. G. Ambaye ◽  
M. Vaccari ◽  
E. D. van Hullebusch ◽  
A. Amrane ◽  
S. Rtimi
Keyword(s):  
Organic Contaminants ◽  
Pyrolysis Temperature ◽  
Low Cost ◽  
Industrial Effluents ◽  
Economic Benefits ◽  
Inorganic Pollutants ◽  
Solution Ph ◽  
Adsorption Mechanisms ◽  
Adsorption Capacities ◽  
Temperature Solution

AbstractCurrently, due to the rapid growth of urbanization and industrialization in developing countries, a large volume of wastewater is produced from industries that contain chemicals generating high environmental risks affecting human health and the economy if not treated properly. Consequently, the development of a sustainable low-cost wastewater treatment approach has attracted more attention of policymakers and scientists. The present review highlights the recent applications of biochar in removing organic and inorganic pollutants present in industrial effluents. The recent modes of preparation, physicochemical properties and adsorption mechanisms of biochar in removing organic and inorganic industrial pollutants are also reviewed comprehensively. Biochar showed high adsorption of industrial dyes up to 80%. It also discusses the recent application and mechanism of biochar-supported photocatalytic materials for the degradation of organic contaminants in wastewater. We reviewed also the possible optimizations (such as the pyrolysis temperature, solution pH) allowing the increase of the adsorption capabilities of biochar leading to organic contaminants removal. Besides, increasing the pyrolysis temperature of the biochar was seen to lead to an increase in its surface area, while it decreases their amount of oxygen-containing functional groups, consequently leading to a decrease in the adsorption of metal (loid) ions present in the medium. Finally, the review suggests that more research should be carried out to optimize the main parameters involved in biochar production and its regeneration methods. Future efforts should be also carried out towards process engineering to improve its adsorption capacity to increase the economic benefits of its implementation.

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