scholarly journals Rapid decolorization of textile wastewater by green synthesized iron nanoparticles

2017 ◽  
Vol 77 (2) ◽  
pp. 511-517 ◽  
Author(s):  
Z. Y. Ozkan ◽  
M. Cakirgoz ◽  
E. S. Kaymak ◽  
E. Erdim
Keyword(s):  
Green Tea ◽  
Textile Industry ◽  
Iron Nanoparticles ◽  
Textile Wastewater ◽  
Punica Granatum ◽  
Color Removal ◽  
Wastewater Sample ◽  
Polyphenolic Content ◽  
Tea Extract ◽  
A Minor

Abstract The effectiveness of green tea (Camellia sinensis) and pomegranate (Punica granatum) extracts for the production of iron nanoparticles and their application for color removal from a textile industry wastewater was investigated. Polyphenols in extracts act as reducing agents for iron ions in aqueous solutions, forming iron nanoparticles. Pomegranate extract was found to have almost a 10-fold higher polyphenolic content than the same amount of green tea extract on a mass basis. However, the size of the synthesized nanoparticles did not show a correlation with the polyphenolic content. 100 ppm and 300 ppm of iron nanoparticles were evaluated in terms of color removal efficiency from a real textile wastewater sample. 300 ppm of pomegranate nanoscale zero-valent iron particles showed more than 95% color removal and almost 80% dissolved organic carbon removal. The degradation mechanisms are is considered to be adsorption and precipitation to a major extent, and mineralization to a minor extent.

scholarly journals Engineered Iron Nanoparticles via Green Routes and Their Applications for Textile Wastewater Treatment

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 658
Author(s):  
Zeynep Yücesoy-Özkan ◽  
Funda Sağırkaya ◽  
Melis Terzi ◽  
M. Mohib Rezayee ◽  
Esra Erdim
Keyword(s):  
Wastewater Treatment ◽  
Green Tea ◽  
Plant Extracts ◽  
Iron Nanoparticles ◽  
Textile Wastewater ◽  
Color Removal ◽  
Tea Leaves ◽  
Toc Removal ◽  
Green Tea Leaves ◽  
Textile Wastewater Treatment

Textile wastewaters are characterized by high chemical oxygen demand (COD) concentration, strong color, high pH and temperature, and low biodegradability. Conventional treatment methods are considered to be inefficient to comply with the discharge limits. Recently, nano zero-valent iron (nZVI) technology has received increasing attention of the scientific community as an emerging technology for treatment of polluted streams. Due to smaller particle size, larger surface area and higher surface reactivity of iron nanoparticles, the removal of pollutants occur very rapidly. In this work, we synthesized nZVI employing green chemistry principles in a chemical reduction reaction. Iron precursor solution (FeSO4) was reduced by plant extracts that contain polyphenols. Plant polyphenols are known to possess strong reducing agent properties and act as effective metal chelators. The objective of this study was to characterize the green synthesized iron nanoparticles in terms of size and zeta potential parameters under various synthesis conditions (pH, precursor concentration and precursor/extract volume ratio) and compare the reactivity of the engineered nanoparticles for textile wastewater treatment. Green tea leaves-GT and Rose leaves-R were selected as the plant sources. Plant extracts were examined in terms of their Total Phenolic Content (TPC) expressed as Gallic Acid Equivalent (GAE). Rose leaves were found to possess 2062 mg/L TPC whereas, Green Tea leaves were found to have 1882 mg/L in grinded powder form. Results showed that 74% color removal along with 18% TOC removal could be achieved with 5 ppm of GT-ZVI nanoparticles synthesized at a 2/1 ratio (v/v) of precursor to extract. With the same concentration of R-ZVI nanoparticles, 78% color removal and 40% of TOC removal were observed.

scholarly journals Performances of Anoxic- Aerobic Membrane Bioreactors for The Treatment of Real Textile Wastewater

2019 ◽  
Keyword(s):  
Bacterial Communities ◽  
Textile Industry ◽  
Textile Wastewater ◽  
Pilot Scale ◽  
Membrane Bioreactors ◽  
Color Removal ◽  
Toc Removal ◽  
Recycle Ratio ◽  
Operation Period ◽  
The Impact

<p>Wastewater from textile industry is considered one of the major environmental challenges due to the large volume of highly colored, polluted and toxic effluent. This study investigated the treatability of real textile wastewater by pilot-scale anoxic-aerobic Membrane Bioreactor (MBR) system without sludge wasting for operation period of 100 days. The proposed system was investigated under different Internal Recycle (IR) ratios and the impact of IR ratio on Total Organic Carbon (TOC), Total Nitrogen (TN) and Color removals were examined. Under IR ratios between anoxic and aerobic tanks of 0.0, 0.5 and 2.0, the respective average removal efficiency of TN was 20.9%,53.4% and 71.7%, whereas average color removal of 81%, 85% and 88%, respectively was noted. The results indicated that increase of recycle ratio from 0.5 to 2.0 enhanced TN removal to about 71% and color removal to above 85%. The IR between anoxic and aerobic tanks has a significant role in TN and color removal due its effect on the development of bacterial communities. On the other hand, the results indicate over 93% TOC removal, which was independent of IR ratio.</p>

Ozonation application in activated sludge systems for a textile mill effluent

2002 ◽  
Vol 45 (12) ◽  
pp. 305-313 ◽  
Author(s):  
D. Orhon ◽  
H. Dulkadiroğlu ◽  
S. Doğruel ◽  
I. Kabdaşli ◽  
S. Sozen ◽  
...  
Keyword(s):  
Textile Industry ◽  
Contact Time ◽  
Biological Treatment ◽  
Textile Wastewater ◽  
Color Removal ◽  
Flux Rate ◽  
Textile Mill ◽  
Treatment Results ◽  
Cod Reduction ◽  
Activated Sludge Systems

The study investigates the effect of partial ozonation of textile wastewater, both at the inlet (pre-ozonation) and the outlet (post-ozonation) of biological treatment, for the optimization of COD and color removals, both typical polluting parameters associated with the textile industry. Pre-ozonation provides at optimum contact time of 15 minutes 85% color removal, but only 19% COD reduction. Removal of the soluble inert COD fraction remains at 7%, indicating selective preference of ozone for simpler compounds. Post-ozonation is much more effective on the breakdown of refractory organic compounds and on color removal efficiency. Ozonation after biological treatment results in almost complete color removal and a 14% soluble inert COD reduction. The polishing effect of post-ozonation also proves quite attractive from an economical standpoint, involving approximately 50% of the ozone utilization at the same ozone flux rate and contact time, yet providing a lower soluble residual COD level.

scholarly journals Textile Wastewater Treatment for Water Reuse: A Case Study

Processes ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 34 ◽  
Author(s):  
Hua Yin ◽  
Peiwen Qiu ◽  
Yuange Qian ◽  
Zhuwen Kong ◽  
Xiaolong Zheng ◽  
...  
Keyword(s):  
Textile Industry ◽  
Water Reuse ◽  
Natural Waters ◽  
Removal Rate ◽  
Operating Cost ◽  
Textile Wastewater ◽  
Color Removal ◽  
Combined Processes ◽  
Sand Filtration ◽  
Drinking Water Standard

The reduced natural waters and the large amount of wastewater produced by textile industry necessitate an effective water reuse treatment. In this study, a combined two-stage water reuse treatment was established to enhance the quality and recovery rate of reused water. The primary treatment incorporated a flocculation and sedimentation system, two sand filtration units, an ozonation unit, an ultrafiltration (UF) system, and a reverse osmosis (RO) system. The second treatment included an ozonation unit, a sand filtration unit, and UF and RO systems. The color removal rate increased with the increasing ozone dosage, and the relational expression between the ozone dosage and color removal rate was fitted. Ozonation greatly reduced the color by 92.59 and 97.27 times during the primary and second ozonation stages, respectively. RO had the highest removal rate. The combined processes showed good performance in water reuse treatment. The treated, reused water satisfied the reuse standard and surpassed the drinking water standard rates for chemical oxygen consumption (CODcr), color, NH3-N, hardness, Cl−, SO42−, turbidity, Fe3+, and Cu2+. The operating cost of reuse water treatment was approximately 0.44 USD·m−3.

scholarly journals INVESTIGATION of COLOR REMOVAL in REAL TEXTILE INDUSTRY WASTEWATER with MEMBRANE BIOREACTOR-ACTIVE CARBON SYSTEM

2021 ◽  
pp. 18-21
Author(s):  
Nurtaç Öz ◽  
Meryem Yılmaz ◽  
Ahmet Çelebi
Keyword(s):  
Activated Carbon ◽  
Active Carbon ◽  
Textile Industry ◽  
Membrane Bioreactor ◽  
High Efficiency ◽  
Textile Wastewater ◽  
Color Removal ◽  
Color Measurement ◽  
Pollution Level ◽  
Carbon System

The textile industry is an industry that consumes large amounts of water during production, contains various chemicals in its wastewater, conventional treatment methods are insufficient to reduce the wastewater pollution level, and has colloidal substances and color problems. Membrane bioreactor systems provide high efficiency in the treatment of textile wastewater and dyestuff removal. Removal of dyestuffs and turbidity in real textile wastewater by using a laboratory-scale membrane bioreactor system was studied. Chemical precipitation was not applied before the biological treatment for the removal of color and other pollutant parameters. A hollow fiber microfiltration membrane module was used in the system. Then a combination with an active carbon filter was created to take the color removal to a higher level. The development of the microorganism composition adapted to the textile industry was observed in the biological reactor. The system was operated with an endless sludge age and a hydraulic retention time of 24 hours. Color measurement transparency index parameter DFZ (DurchsichtsFarbZahl) was measured in a spectrophotometer at wavelengths of 436, 525, and 620 nm (nanometers) according to EN ISO 7887 standards. In the microfiltration permeate water, the color removal were found in 436 nm: 91-95%, 525 nm: 94-98%, 620 nm: 96-99%, and in activated carbon permeate water, the color removal in 436 nm: 96-99% at 525 nm: 95-99%, 620 nm: 96-99%, respectively. Due to the physical separation of the membrane, which is the simplest definition, high efficiencies in color removal have been achieved in the system. The activated carbon system combined with the membrane was found higher efficiency in color removal than the microfiltration output.

scholarly journals Comparison of naturally prepared coagulants for removal of COD and color from textile wastewater

2013 ◽  
Vol 15 (4) ◽  
pp. 522-528 ◽  
Keyword(s):  
Textile Industry ◽  
Textile Wastewater ◽  
Color Removal ◽  
Volume Index ◽  
Percentage Reduction ◽  
Maize Seed ◽  
Sludge Volume Index ◽  
Maximum Percentage ◽  
Industrial Sectors ◽  
Flocculation Time

<p>The wastewater generated by the textile industry is rated as the most polluting among all industrial sectors considering both volumes discharged and effluent composition. Present investigation intended for COD and color removal from textile wastewater using naturally prepared coagulants i.e. Surjana Seed Powder (SSP), Maize Seed Powder (MSP) and Chitosan. Effect of coagulant dose, flocculation time and temperature has been studied. The Sludge Volume Index (SVI) and turbidity were examined for various effects. SSP was more effective than Chitosan and MSP for the removal of COD and color and also, Chitosan was more efficient than SSP and MSP considering SVI and turbidity. Maximum percentage reduction corresponds to 75.6 and 62.8 was obtained for removal of COD and color respectively using SSP.</p>

Eco-friendly synthesis of iron nanoparticles by green tea extract and cytotoxicity effects on tumoral and non-tumoral cell lines

2019 ◽  
Vol 4 (6) ◽  
pp. 261-270 ◽  
Author(s):  
Isabella M. Lourenço ◽  
Joana C. Pieretti ◽  
Mônica Helena M. Nascimento ◽  
Christiane B. Lombello ◽  
Amedea B. Seabra
Keyword(s):  
Cell Lines ◽  
Green Tea ◽  
Iron Nanoparticles ◽  
Green Tea Extract ◽  
Tumoral Cell ◽  
Tea Extract ◽  
Cytotoxicity Effects

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.

scholarly journals Green Synthesis of Iron Nanoparticles Using Green Tea and Its Removal of Hexavalent Chromium

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 650
Author(s):  
Runqin Hao ◽  
Dong Li ◽  
Jie Zhang ◽  
Tifeng Jiao
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Green Tea ◽  
Specific Surface Area ◽  
Iron Nanoparticles ◽  
Average Particle Size ◽  
Green Tea Extract ◽  
Average Particle ◽  
Chromium Vi ◽  
Tea Extract

Chromium (VI) is a ubiquitous groundwater contaminant and it is dangerous to both ecological and human health. Iron nanoparticles (nFe) have a large specific surface area and they are highly efficient in removing chromium (VI) from aqueous solution. However, since the traditional reductive synthesis of nFe is relatively expensive and often causes secondary pollution, it is necessary to develop a low-cost green synthetic method using plant extracts. Synthetic conditions are important for obtaining highly active chromium-removing nanomaterials. In this paper, a green tea extract was used to prepare nFe and the effects of synthetic conditions on subsequent remediation performance were investigated. The optimal conditions included a green tea extract/Fe2+ ratio of 1:2 (91.6%), a green tea extract temperature of 353 K (88.3%) and a synthetic temperature of 298 K (88.1%). Advanced material characterization techniques, including XPS, SEM-EDS, TEM, and Brunauer–Emmett–Teller (BET) confirmed that the average particle size was between 50–80 nm, with a specific surface area of 42.25 m2·g−1. Furthermore nFe had a core-shell structure, where Fe (0) constituted the core and a shell was composed of iron oxide. Finally, a mechanism for synthesizing nFe by green tea extract was proposed, providing a theoretical basis for optimized synthetic conditions for preparing nFe when using green tea extract.

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