Advanced treatment of dyeing wastewater towards reuse by the combinedFenton oxidation and membrane bioreactor process
Fei Feng , Zhenliang Xu , Xiaohuan Li , Wenting You , Yang Zhen
DOI:
Received December 04, 2009,Revised April 10, 2010, Accepted , Available online
Volume 22,2010,Pages 1657-1665
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The performance of combined Fenton oxidation and membrane bioreactor (MBR) process for the advanced treatment of an effluent
from an integrated dyeing wastewater treatment plant was evaluated. The experimental results revealed that under the optimum Fenton
oxidation conditions (initial pH 5, H2O2 dosage 17 mmol/L, and Fe2+ 1.7 mmol/L) the average total organic carbon (TOC) and color
removal ratios were 39.3% and 69.5% after 35 min of reaction, respectively. Results from Zahn-Wallens Test also represented that
Fenton process was effective to enhance the biodegradability of the test wastewater. As for the further purification of MBR process,
TOC removal capacity was examined at different hydraulic retention times (HRT) of 10, 18 and 25 hr. Under the optimum HRT of 18
hr, the average TOC concentration and color of the final MBR effluent were 16.8 mg/L and 2 dilution time, respectively. The sludge
yield coefficient was 0.13 g MLSS/g TOC and TOC degradation rate was 0.078 kg TOC/(m3·day). The final effluent of MBR can meet
the reuse criteria of urban recycling water – water quality standard for miscellaneous water consumption GBT18920-2002.
