Diagnosis of the anaerobic reject water effects on WWTP operational characteristics as a precursor of bulking and foaming

Water Science and Technology : a Journal of the International Association on Water Pollution Research
Dilek Erdirençelebi, Murat Küçükhemek

Abstract

This study investigates the effects observed on operational parameters in a large and full-scale wastewater treatment plant subjected to anaerobic reject water (ARW) diversion off the main line for a 3-month period and further monitoring for a 2-year period. The plant's secondary unit consists of a two-stage plug-flow-modified Bardenpho process receiving wastewater from both municipal and industrial origins. As a result, ARW was found to have a direct effect on bulking in secondary clarifiers and foaming in anaerobic digesters (AD) despite its relatively small flow rate. During the cut-off period a highly stable sludge volume index at 80 mL g(-1) level was obtained in the secondary clarifiers, effluent suspended solids concentration was reduced and continuous feeding to AD was recovered. Sludge density increased in the thickeners during hot season. Secondary clarifiers showed good and stable settleability despite low dissolved oxygen, food/microorganism ratio and high sludge retention time and ammonium levels in the biological unit. The bulking and foaming effect was presented on the plant's internal flow balance. ARW needs serious consideration for elimination by appropriate technologies because of its high potential as a mult...Continue Reading

References

Feb 11, 2004·Water Research·António M P MartinsMark C M van Loosdrecht
Aug 28, 2009·Environmental Science & Technology·Adriano JossHansruedi Siegrist
Oct 20, 2009·Bioresource Technology·Jian-Hua GuoZhi-Rong Sun

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Citations

Mar 10, 2015·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Akintunde BabatundeGuoren Xu

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