Abstract：
:Side-stream sludge treatment using free nitrous acid (FNA) is a novel strategy to achieve nitritation in mainstream of wastewater treatment plants (WWTPs). To optimize nitritation, the effect of starvation on this strategy was investigated in this study. The results showed that pre-starvation, which is the starvation before FNA treatment, enhanced the resistance of sludge to FNA. This led to a decrease in the nitrite accumulation rate (NAR), which dropped from 70% to 27% after aerobic pre-starvation. This was further confirmed in the FNA treatment using the sludge collected from the secondary settling tank (anoxic pre-starvation) and the aerobic zone (without starvation) of an Anaerobic-Anoxic-Oxic system. The post-starvation, which was the starvation after FNA treatment, decreased NAR from 63% to 14%. To obtain a higher NAR, the sludge used for FNA treatment should be collected from aerobic zone, and be returned to aerobic zone after treatment to avoid pre-starvation and post-starvation.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Nan X,Ma B,Qian W,Zhu H,Li X,Zhang Q,Peng Ydoi
10.1016/j.biortech.2018.09.113subject
Has Abstractpub_date
2019-01-01 00:00:00pages
159-165eissn
0960-8524issn
1873-2976pii
S0960-8524(18)31366-Xjournal_volume
271pub_type
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