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 Supported Zinc Oxide Photocatalyst for Decolorization and Mineralization of Orange G Dye Wastewater under UV365 Irradiation

2013 ◽  
Vol 2013 ◽  
pp. 1-12 ◽  
Author(s):  
Ming-Chin Chang ◽  
Hung-Yee Shu ◽  
Tien-Hsin Tseng ◽  
Hsin-Wen Hsu
Keyword(s):  
Reaction Time ◽  
Azo Dye ◽  
Textile Wastewater ◽  
Color Removal ◽  
Fluorescent Light ◽  
Preparation Temperature ◽  
Steel Mesh ◽  
Toc Removal ◽  
Photocatalytic System ◽  
Orange G

To solve the environmental challenge of textile wastewater, a UV/ZnO photocatalytic system was proposed. The objective of this study was to prepare a photocatalytic system by utilizing both cold cathode fluorescent light (CCFL) UV irradiation and steel mesh supported ZnO nanoparticles in a closed reactor for the degradation of azo dye C.I. Orange G (OG). Various operating parameters such as reaction time, preparation temperature, mixing speed, ZnO dosage, UV intensity, pH, initial dye concentration, and service duration were studied. Results presented efficient color and total organic carbon (TOC) removal of the OG azo dye by the designed photocatalytic system. The optimal ZnO dosage for color removal was 60 g m−2. An alkaline pH of 11.0 was sufficient for photocatalytic decolorization and mineralization. The rate of color removal decreased with the increase in the initial dye concentration. However, the rate of color removal increased with the increase in the UV intensity. The steel mesh supported ZnO can be used repeatedly over 10 times without losing the color removal efficiency for 120 min reaction time. Results of Fourier transform infrared (FTIR) and ion chromatography (IC) indicated the breakage of N=N bonds and formation of sulfate, nitrate, and nitrite as the major and minor products. The observation indicated degradation of dye molecules.

MICROCLEAR: GREEN TECHNOLOGY FOR TREATING AND RECYCLING OF COLOURED WASTEWATER

2015 ◽  
Vol 77 (31) ◽  
Author(s):  
Zaharah Ibrahim ◽  
Adibah Yahya ◽  
Azmi Aris ◽  
Ifnu Hakim ◽  
Mohd Ariff Taib ◽  
...  
Keyword(s):  
Textile Industry ◽  
Large Scale ◽  
Treatment Plant ◽  
Textile Wastewater ◽  
Good Alternative ◽  
Pilot Scale ◽  
Green Technology ◽  
Scale Production ◽  
Continuous Growth ◽  
Set Up

The continuous growth and demand for our textiles and textile products have resulted in the generation of highly polluted and coloured wastewater emanating from the textile industries. These are detrimental to the environment and pose health threats to the human population if not properly treated. The treatment of colour is a great challenge over the last decades and until now, there is no single and economical treatment process.  As effective treatment plant is generally expensive and unaffordable; a good alternative and timely solution is the utilisation of specialised group of microbes called Microclear. These microorganisms have the abilities to decolourise and transform coloured compounds into simpler and non-hazardous compounds without the use of chemicals. Intensive fundamental studies and also the application of the Microclear at the bench and pilot scale (sequential 1000 L and 2000 L) reactors to treat real wastewater were carried out. The microbes can also be applied directly into the existing treatment plant or ponding systems without the use of a commercial reactor. . Under the UTM-MTDC symbiosis program, Microclear Sdn. Bhd. was set up and work is in progress for large scale production of microbes to treat real textile wastewater in a demo plant of 150,000 L capacity located at the textile industry.

scholarly journals Bioefficacies of microbes for mitigation of Azo dyes in textile industry effluent: A review

BioResources ◽  
2020 ◽  
Vol 15 (4) ◽  
pp. 9858-9881
Author(s):  
Ambika Saxena ◽  
Sarika Gupta
Keyword(s):  
Azo Dyes ◽  
Textile Industry ◽  
Dye Degradation ◽  
Complex Structure ◽  
Industrial Effluent ◽  
Chemical Properties ◽  
Textile Wastewater ◽  
Textile Dyeing ◽  
Industry Effluent ◽  
The Impact

In recent years, India has emerged as a promising industrial hub. It has a cluster of textile, dyeing, and printing industries. The adjoining rivers/water bodies receive mostly untreated discharge from these industries. Textile industrial effluent contains various contaminants (dyes, heavy metals, toxicants, and other organic/inorganic dissolved solids) that alter the physico-chemical properties of adjoining land and waterbodies in which it is discharged, thereby degrading the water quality and subsequently affecting the landscapes in the vicinity. This ultimately affects the flora and fauna of the locale and has adverse effects on human health. Out of the total dyes (approximately 10,000 dyes) exploited in the textile dyeing and printing units, azo dyes possess a complex structure and are synthetic in origin. They contribute nearly 70% to the total effluent discharge. Biological processes are based on the ability of inhabiting indigenous microorganisms in these contaminated environments to tolerate, resist, decolorize/degrade, and mitigate the recalcitrant compounds. Exploring microbes with higher efficacy of azo dye degradation can reduce the amount of chemical discharged from the process. The present review explores the potential of microbial diversity for the development of an effective bioremediation approach. The review also includes the impact of azo dyes on the flora and fauna, as well as conventional and microbe-assisted nanoparticle technology for treatment of the textile wastewater targeting the degradation of dye contaminants.

scholarly journals Portrayal of Textile Based Pollutants and its Impact on Soil, Plants and Fisheries

2021 ◽  
Vol 20 (3) ◽  
Author(s):  
M. Riza ◽  
M. N. Ehsan ◽  
S. Hoque
Keyword(s):  
Textile Industry ◽  
Global Economy ◽  
Negative Impact ◽  
Aquatic Organisms ◽  
Textile Wastewater ◽  
Biochemical Properties ◽  
Textile Processing ◽  
Textile Effluents ◽  
Positive Effects ◽  
The Impact

The textile industry occupies a significant hold on the global economy. This substantial industry often generates a large volume of effluents exceeding the permissible limit of discharge in the different regions of the world. Therefore, textile effluents act as pollutants altering the natural composition of various components of the environment. This paper discusses the impact of textile-based pollutants on agriculture including plants, soil, water and fisheries. The observed result is significant because textile effluents exert a widespread negative impact on the respective respondents, though plants show few positive effects. Prior treatment of textile wastewater is necessary before applying it to the soil, as there is a possibility of affecting the plant ecosystem via soil media. Plants are benefitted in terms of germination and growth, due to irrigation by textile effluents with proper dilution. The physical and biochemical properties of water streams along with aquatic organisms are impacted by these specific discharges, leading to even severe deterioration of particular living creatures. Pollutants released from various steps of textile processing have adverse effects on the environment, disturbing the food chain, ecosystem, and overall ecological balance.

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.

Treatment of Textile Wastewater Using Facultative Contact Reactor-Biological Contact Oxidation and Ozone Biological Aerated Filter

2013 ◽  
Vol 777 ◽  
pp. 318-325 ◽  
Author(s):  
Jia Qi Cui ◽  
Xiao Jun Wang ◽  
Xu Long Lin
Keyword(s):  
Textile Industry ◽  
Textile Wastewater ◽  
Pilot Scale ◽  
Operating Conditions ◽  
Biological Aerated Filter ◽  
Combined Process ◽  
Contact Oxidation ◽  
Aerated Filter ◽  
Textile Wastewater Treatment ◽  
Biological Contact Oxidation

The performance of a pilot scale combined process of facultative contact reactor-biological contact oxidation and ozone biological aerated filter (FCR-BCO-O3-BAF) treating real textile wastewater was investigated in this study. During the operating period, the average influent and effluent COD concentrations were 737.0mg/L and 15.6mg/L, the influent and effluent color were 750 times and 10 times, with the total HRT being 43.3h. The average COD and color removal efficiency were 97.9% and 98.7%, respectively. And the effluent COD and color satisfied the discharge standards (grade-1) of water pollutants for dyeing and finishing of textile industry (China). In the operating conditions, HRT of O3-BAF was decreased, leading to an increase of the effluent COD concentration. In addition, under the facultative circumstance by micro aeration in the FCR, where the dissolved oxygen (DO) was maintained in the range of 0.1-0.3mg/L, the growth of sulfate reducing bacteria (SRB) was inhibited. This study is a significant attempt to apply the combined process of FCR-BCO-O3-BAF to textile wastewater treatment.

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 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 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.

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