Dual purpose recovered coagulant from drinking water treatment residuals for adjustment of initial pH and coagulation aid in electrocogulation process
- Dual purpose recovered coagulant from drinking water treatment residuals for adjustment of initial pH and coagulation aid in electrocogulation process
- Textile wastewater; Electrocoagulation; Dual purpose recovered coagulant; Coagulation aid; Response surface methodology
- Issue Date
- Environmental technology
- The present study is focused on the application of recovered coagulant (RC) by acidification from
drinking water treatment residuals for both adjusting the initial pH and aiding coagulant in
electrocoagulation. To do this, real cotton textile wastewater was used as a target pollutant, and
decolorization and chemical oxygen demand (COD) removal efficiency were monitored. A
preliminary test indicated that a stainless steel electrode combined with RC significantly
accelerated decolorization and COD removal efficiencies, by about 52% and 56%, respectively,
even at an operating time of 5 min. A single electrocoagulation system meanwhile requires at
least 40 min to attain the similar removal performances. Subsequently, the interactive effect of
three independent variables (applied voltage, initial pH, and reaction time) on the response
variables (decolorization and COD removal) was evaluated, and these parameters were
statistically optimized using the response surface methodology. Analysis of variance showed a
high coefficient of determination values (decolorization, R2 = 0.9925 and COD removal, R2 =
0.9973) and satisfactory prediction second-order polynomial quadratic regression models.
Average decolorization and COD removal of 89.52% and 94.14%, respectively, were achieved,
corresponding to 97.8% and 98.1% of the predicted values under statistically optimized
conditions. The results suggest that the RC effectively played a dual role of both adjusting the
initial pH and aiding coagulant in the electrocoagulation process.
- Appears in Collections:
- KIST Publication > Article
- Files in This Item:
There are no files associated with this item.
- RIS (EndNote)
- XLS (Excel)
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.