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Textile dyeing wastewater treatment in a sequencing batch reactor system
M T Vives1, M D Balaguer, S García
1Laboratori d'Enginyeria Química i Ambiental, Department EQATA, Universitat de Girona, Campus Montilivi, Girona, Spain. teia.vives@lequia.udg.es
Summary
This study shows a lab-scale Sequencing Batch Reactor (SBR) can effectively treat textile wastewater for organic carbon removal. A step-feed strategy optimized the process, reducing biodegradable matter in the effluent.
Area of Science:
- Environmental Engineering
- Wastewater Treatment Technologies
- Bioreactor Design
Background:
- Textile industry wastewater presents complex treatment challenges due to variable characteristics.
- Organic carbon removal is crucial for mitigating environmental pollution from textile effluents.
- Biological treatment methods, like those using activated sludge, are vital for sustainable wastewater management.
Purpose of the Study:
- To investigate the feasibility of biological treatment for textile wastewater focusing on organic carbon removal.
- To evaluate the performance of a lab-scale Sequencing Batch Reactor (SBR) for this purpose.
- To optimize the SBR operation using a step-feed strategy for enhanced effluent quality.
Main Methods:
- A lab-scale Sequencing Batch Reactor (SBR) was utilized for treating textile wastewater.
- Data acquisition and control software enabled online monitoring of dissolved oxygen and Oxygen Uptake Rate (OUR).
- Wastewater characterization included pH, conductivity, solids, Chemical Oxygen Demand (COD), ammonia, and Total Kjeldahl Nitrogen (TKN).
- A step-feed strategy was implemented, adjusting SBR water change ratio and feeding patterns after sludge adaptation.
Main Results:
- Online Oxygen Uptake Rate (OUR) profiles were successfully obtained during aerobic reaction periods.
- Periodical analyses confirmed the high variability of textile wastewater characteristics.
- The SBR demonstrated effectiveness in removing organic carbon from the treated wastewater.
- The step-feed strategy, combined with SBR water change ratio modification, contributed to reducing effluent biodegradable matter.
Conclusions:
- The lab-scale SBR is a feasible technology for biologically treating textile wastewater and removing organic carbon.
- Online OUR monitoring provides valuable insights into the biological treatment process.
- Optimized feeding strategies, such as step-feeding, are effective in enhancing the removal of biodegradable matter in SBRs treating textile wastewater.