Textile wastewater treatment and reuse by solar catalysis: results from a pilot plant in Tunisia

Based on results from bench-scale flow-film-reactors (FFR) and aerated cascade photoreactors, a solar catalytic pilot plant has been built at the site of a textile factory. This plant has an illuminated surface area of 50 m2 and is designed for the treatment of 1 m3 h-1 of wastewater. The preliminary results are presented and compared with a bench-scale FFR using textile wastewater and dichloroacetic acid. Equivalent degradation kinetics were obtained and it was demonstrated that the solar catalytic technology is able to remove recalcitrant compounds and color. However, on-site optimization is still necessary for wastewater reuse and for an economic application.

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Pilot-Scale Study of Real Domestic Textile Wastewater Treatment Using Cassia fistula Seed-Derived Coagulant

Journal of Chemistry ◽

10.1155/2021/7608856 ◽

2021 ◽

Vol 2021 ◽

pp. 1-8

Author(s):

Minh-Trung Dao ◽

Vo-Chau-Ngan Nguyen ◽

Thanh-Nha Tran ◽

Xuan-Du Nguyen ◽

Duc-Thuong Vo ◽

...

Keyword(s):

Wastewater Treatment ◽

Textile Wastewater ◽

Pilot Scale ◽

Cassia Fistula ◽

Bench Scale ◽

Carboxylate Groups ◽

Coagulant Dosage ◽

Initial Ph ◽

Seed Gum ◽

Textile Wastewater Treatment

Plant-derived coagulants have exhibited a good potential in wastewater treatment due to their “green” characteristics, high coagulating-flocculating activity, cost-effectiveness, and biodegradability. Nevertheless, research studies have focused mainly on bench-scale experiments; pilot-scale and full-scale simulations are still limited. Herein, we firstly report a pilot-scale study of real domestic textile wastewater treatment using Cassia fistula coagulant. The material characterizations using Fourier-transform infrared spectroscopy (FTIR), scanning electron microscope (SEM), and dynamic light scattering (DLS) revealed that the natural gum extracted from C. fistula seed possessed a rough and irregular surface containing a high molecular weight galactomannan. The bench-scale investigation was initially conducted to determine the optimal pollutant concentration, initial pH, and coagulant dosage in the coagulation-flocculation process. The pilot-scale study revealed that C. fistula coagulant is an effective material for real textile wastewater treatment, showing percentage removal of 93.83% at a volume of 30 L and a coagulant dosage of 1.17 mg·L−1. Coagulation-flocculation using C. fistula seed gum could be an efficient primary wastewater treatment prior to membrane or biological methods to meet Vietnamese environmental standards. The main mechanisms of textile wastewater treatment involve adsorption/bridging interactions via hydrogen bonding and electrostatic attraction between negatively charged carboxylate groups of the coagulant and positively charged pollutants.

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Textile wastewater treatment in a bench-scale anaerobic-biofilm anoxic-aerobic membrane bioreactor combined with nanofiltration

Journal of Environmental Science and Health Part A ◽

10.1080/10978526.2011.609078 ◽

2011 ◽

Vol 46 (13) ◽

pp. 1512-1518 ◽

Cited By ~ 13

Author(s):

Selene Grilli ◽

Daniela Piscitelli ◽

Davide Mattioli ◽

Stefania Casu ◽

Alessandro Spagni

Keyword(s):

Wastewater Treatment ◽

Membrane Bioreactor ◽

Textile Wastewater ◽

Bench Scale ◽

Textile Wastewater Treatment

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Anaerobic Raw Textile Wastewater Treatment in UASB Reactor with Cow Dung Manure and Activated Sludge as Substrate

Journal of Environmental Science Computer Science and Engineering & Technology ◽

10.24214/jecet.a.6.3.23542 ◽

2017 ◽

Vol 6 (3) ◽

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Textile Wastewater ◽

Uasb Reactor ◽

Cow Dung ◽

Textile Wastewater Treatment

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Textile Wastewater Reuse: Ozonation of Membrane Concentrated Secondary Effluent

Water Science & Technology ◽

10.2166/wst.1999.0580 ◽

1999 ◽

Vol 40 (4-5) ◽

pp. 99-105 ◽

Cited By ~ 18

Author(s):

A. Lopez ◽

G. Ricco ◽

R. Ciannarella ◽

A. Rozzi ◽

A. C. Di Pinto ◽

...

Keyword(s):

Wastewater Treatment ◽

Acute Toxicity ◽

Wastewater Treatment Plant ◽

Textile Industry ◽

Nonionic Surfactants ◽

Wastewater Reuse ◽

Treatment Plant ◽

Textile Wastewater ◽

Secondary Effluent ◽

Complete Disappearance

Among the activities appointed by the EC research-project “Integrated water recycling and emission abatement in the textile industry” (Contract: ENV4-CT95-0064), the effectiveness of ozone for improving the biotreatability of recalcitrant effluents as well as for removing from them toxic and/or inhibitory pollutants has been evaluated at lab-scale. Real membrane concentrates (pH=7.9; TOC=190 ppm; CDO=595 ppm; BOD5=0 ppm; Conductivity=5,000 μS/cm; Microtox-EC20=34%) produced at Bulgarograsso (Italy) Wastewater Treatment Plant by nanofiltering biologically treated secondary textile effluents, have been treated with ozonated air (O3conc.=12 ppm) over 120 min. The results have indicated that during ozonation, BOD5 increases from 0 to 75 ppm, whereas COD and TOC both decrease by about 50% and 30 % respectively. As for potentially toxic and/or inhibitory pollutants such as dyes, nonionic surfactants and halogenated organics, all measured as sum parameters, removals higher than 90% were achieved as confirmed by the complete disappearance of acute toxicity in the treated streams. The only ozonation byproducts searched for and found were aldehydes whose total amount continuously increased in the first hour from 1.2 up to 11.8 ppm. Among them, formaldehyde, acetaldehyde, glyoxal, propionaldehyde, and butyraldehyde were identified by HPLC.

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