Next Article in Journal
Contours of a Resilient Global Future
Previous Article in Journal
Persea schiedeana: A High Oil “Cinderella Species” Fruit with Potential for Tropical Agroforestry Systems
Sustainability 2014, 6(1), 112-122; doi:10.3390/su6010112
Article

Pilot Experimentation with Complete Mixing Anoxic Reactors to Improve Sewage Denitrification in Treatment Plants in Small Communities

1
,
1,* , 2
 and
1
Received: 31 October 2013 / Revised: 10 December 2013 / Accepted: 13 December 2013 / Published: 23 December 2013
View Full-Text   |   Download PDF [1063 KB, uploaded 24 February 2015]   |   Browse Figures

Abstract

This paper reports the results of two sewage treatment tests in a community of 15,000 inhabitants. The sewage treatment plant is subject to strong fluctuations in load (BOD5, COD, TKN), and in particular in the BOD5/TKN ratio. These fluctuations adversely affect the biological denitrification, as demonstrated by many pilot and real-scale plants. The plants we tested were subjected to two treatment types: anoxic-aerobic and simultaneous denitrification. Both processes are designed for complete mixing conditions in the reactors in order to level the fluctuations in the load and thus improve the denitrification efficiency. The results prove that an average denitrification efficiency of up to 80% can be achieved with the sludge loading close to 0.1 kg BOD5 (d∙kgMLVSS)−1. The effect of the sludge loading and dissolved oxygen on the denitrification efficiency is highlighted.
Keywords: denitrification; dissolved oxygen; load fluctuation; pilot plant denitrification; dissolved oxygen; load fluctuation; pilot plant
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote
MDPI and ACS Style

Raboni, M.; Torretta, V.; Viotti, P.; Urbini, G. Pilot Experimentation with Complete Mixing Anoxic Reactors to Improve Sewage Denitrification in Treatment Plants in Small Communities. Sustainability 2014, 6, 112-122.

View more citation formats

Article Metrics

Comments

Citing Articles

[Return to top]
Sustainability EISSN 2071-1050 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert