Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 707, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.135648
Keywords
Anammox; Nitritation; Hydroxylamine; Hydrazine; In-situ restoration
Categories
Funding
- National Major Science and Technology Projects of China for Water Pollution Control and Management [2017ZX07102003]
- National Key Research and Development Program [2016YFD0501405]
- National Natural Science Foundation of China [21607167, 41501513]
- Key Research and Development Program of Jiangxi Province [20171ACG70018]
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Nitrate built-up is a serious operational difficulty in one-stage partial nitritation anammox (PN/A) process. To investigate an effective method for in-situ restoration, hydroxylamine (NH2OH) and hydrazine (N2H4) of 2 mgN/L were dosed in PN/A process with nitrate built-up in a comparative study. NH2OH treatment showed better performances on TN removal and nitrate reduction than N2H4 and blank control. Through 104 days' addition of NH2OH, MRNN (mole ratio of NO3--N production to NH4+-N removal) was decreased from 70% to 19.91%; TN removal was increased from 0.01 to 0.18 kgN/(m(3) d). After stopping the chemical addition, nitrate rebounded for N2H4 treatment, but the restoration effect was stable and persistent for NH2OH. NH2OH addition resulted in a low reductive potential (-250 mV) and exerted strong inhibitions on nitrite oxidizing bacteria activities. Additionally, rapid enhancement of ammonia oxidizing bacteria activities, functional gene (hao) and Nitrosomonas gave rise to the restoration of PN/A with NH2OH addition. (C) 2019 Elsevier B.V. All rights reserved.
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