Pilot plant demonstration of stable and efficient high rate biological nutrient removal with low dissolved oxygen conditions

Water Research
Natalie A KeeneDaniel R Noguera

Abstract

Aeration in biological nutrient removal (BNR) processes accounts for nearly half of the total electricity costs at many wastewater treatment plants. Even though conventional BNR processes are usually operated to have aerated zones with high dissolved oxygen (DO) concentrations, recent research has shown that nitrification can be maintained using very low-DO concentrations (e.g., below 0.2 mg O2/L), and therefore, it may be possible to reduce energy use and costs in BNR facilities by decreasing aeration. However, the effect of reduced aeration on enhanced biological phosphorus removal (EBPR) is not understood. In this study, we investigated, at the pilot-scale level, the effect of using minimal aeration on the performance of an EBPR process. Over a 16-month operational period, we performed stepwise decreases in aeration, reaching an average DO concentration of 0.33 mg O2/L with stable operation and nearly 90% phosphorus removal. Under these low-DO conditions, nitrification efficiency was maintained, and nearly 70% of the nitrogen was denitrified, without the need for internal recycling of high nitrate aeration basin effluent to the anoxic zone. At the lowest DO conditions used, we estimate a 25% reduction in energy use for aerat...Continue Reading

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Citations

Feb 6, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Jose JimenezPeter Dold
May 14, 2020·Water Environment Research : a Research Publication of the Water Environment Federation·Stephanie Klaus, Charles B Bott
Feb 16, 2019·Frontiers in Microbiology·Natalie K Beach, Daniel R Noguera
Apr 26, 2020·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jianfeng WenWendong Tao
Dec 1, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·François-René BourgeoisDaniel G Cyr
May 15, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·S W HowA S M Chua
Jan 11, 2019·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Erika VargaImre Takács
May 24, 2021·Environmental Science and Pollution Research International·Qian ShaoJiajie He
Sep 26, 2020·Ecotoxicology and Environmental Safety·Jiaxing LuJian Zhang
May 27, 2021·Water Environment Research : a Research Publication of the Water Environment Federation·Quan YuanHulin Cai
Nov 21, 2018·Biochemistry·Xinyun CaoOphelia S Venturelli
Sep 12, 2021·Applied Microbiology and Biotechnology·Eva SpieckSabine Keuter

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