Abstract
The untreated wastewater from the dye industry having high ammoniacal nitrogen and chemical oxygen demand (COD) significantly pollutes the receiving water, such as a river, having major ill implications on the aquatic environment. The present study is undertaken to address this problem. It investigates the effectiveness of Fenton reagent in simultaneous treatment (removal) of ammoniacal nitrogen and COD present in the wastewater by varying the parameters like pH, concentration of Fe 2+ and H2O2 and their molar ratio. The reaction time for all the experiments was kept 60 min. The experimental analysis in terms of calculating the residual % of ammoniacal nitrogen and COD revealed that the maximum reduction occurred at pH 3. At this pH, further set of experiments were performed by varying the molar doses of Fe2+/H2O2 as 1:1, 3:3 and 5:5, and the results reveal that the maximum reduction in both ammoniacal nitrogen and COD happens at molar dose of 3:3. To understand the effect of the concentration of Fe2+ and H2O2 on the respective removal efficiency, set of experiments were performed by taking the molar ratio of Fe2+/H2O2 as 2:1, 3:1, 5:1, 1:2, 1:3 and 1:5. The experimental analysis reveals that the maximum reduction happened at molar ratio 1:3. Fenton process can mineralize the pollutants up to 75.8% and 78.6% for ammoniacal nitrogen and COD removal. The findings of the study would be of great use for planning and optimizing the wastewater treatment facility for the dye intermediate industry.
Highlights
In India, the production of dyestuff and pigments is more than 80,000 tonnes per annum (Nidheesh et al 2018)
The wastewaters from the dye intermediate industry are highly acidic and contain nitrogenous pollutants, carbonaceous pollutants and other toxic compounds which are hazardous to the human health and to the aquatic environment (Bhatia et al 2018; Markandeya et al 2018; Kaur et al 2019)
Ammoniacal nitrogen when converted to nitrate nitrogen causes high nitrogenous oxygen demand (NOD) which leads to methemoglobinemia
Summary
In India, the production of dyestuff and pigments is more than 80,000 tonnes per annum (Nidheesh et al 2018). Gujarat is textile hub of India with more than 1500 textile industries (Bhatia et al 2018; Paździor et al 2018). These industries contribute more than 40% of the Indian dyestuff production and more than 60% of Indian exports of dyestuff. The wastewaters from the dye intermediate industry are highly acidic and contain nitrogenous pollutants (various compounds of nitrate, nitrite and ammoniacal nitrogen), carbonaceous pollutants and other toxic compounds which are hazardous to the human health and to the aquatic environment (Bhatia et al 2018; Markandeya et al 2018; Kaur et al 2019). Exposure to such toxins causes high health risks like liver damage, skin irritation
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
