Page 413 - AWSAR 2.0

of textile wastewater was generated. Tirupur is located in the upper hydrological basin of the Cauvery River. In the first stage, Tirupur real textile wastewater was completely analysed for all the parameters COD, BOD, TOC, TSS, nitrates, chlorides, etc. Two different classes of dyes were selected based on their abundance of usage and were mostly found in Tirupur textile wastewater samples. The dyes were Methylene Blue cationic basic dye and Congo Red anionic azo dye with each initial concentration of 50 mg/L. Among all the dyes, these dyes are well-known for their toxicity.
Initially, some part of the treatment was given in Electrocoagulation-Flotation (EC-F) process for both the dyes separately. In the case of the conventional EC-F process, a higher electrolysis time results in high power consumption and frequent replacement of electrodes. Usually, cationic dyes require a relatively long time in EC-F because of cationic metals generated in the
process. Interestingly, it was
found that both anionic and
cationic dyes were effectively
decolourized in less treatment
time (4–6 min) provided in the
EC-F process. Also, by giving
only 4–6 min of treatment
time in the EC-F process, the
electrode passivation was
highly reduced. The same
electrodes were again used for
a couple of experiments, which
produced fruitful results. Later,
the partially treated coloured
wastewater in EC-F was treated
in the pulsed power plasma
reactor. This worked on the principle of generation of highly reactive oxygen species (ROS). This particular treatment technology is well-known for its high potential in the complete degradation of any pollutant. But, in PPT, high energy consumption is required to treat
Ms. Nippatlapalli Narasamma || 389
complex structure pollutants as they demand more treatment time. Using our proposed hybrid system, both cationic and anionic dyes were completely degraded without sludge production.OurLC-MSanalysishasconfirmed the complete degradation of both anionic and cationic dyes with hybrid treatment.
Our interpretation of partial treatment in the EC-F process immensely reduced the overall cost of about 41.2% and 30.7% with complete degradation of cationic and anionic dyes, respectively. From our experimental output, we recommend reducing the strength of wastewater before treating it in pulsed plasma instead of direct raw wastewater. It highly helps for a strong utilization of generated ROS species and a reduction in energy consumption.
Next, our curiosity was broadened, and we evaluated the performance of the proposed hybrid treatment system for the treatment of
real textile wastewater, which was collected from Tirupur. The initial organic (TOC mg/L) concentration was 312.6 mg/L. This organic content is generally a mixture of several dyes and chemicals used in the textile industry. Surprisingly, notable results of 97.8% removal were obtained for such higher initial concentration (312.6 mg/L) within 16 min (8 min EC-F + 8 min PPT) of the hybrid treatment. In any treatment process, TOC removal indicates the complete degradation of pollutants. It is not easy to achieve
complete degradation of high concentration wastewater in much less time. Therefore, the proposed hybrid system confirms its brilliant performance for the complete removal of highly concentrated toxic dyes in real textile wastewater. This completely cleaned textile
A simple electrolytic reactor setup (Electrocoagulation- Flotation) along with pulsed power plasma is coupled in our proposed research. The main advantage of Electrocoagulation- Flotation is the faster removal of colour and pollutant degradation by direct oxidation.