Nitrite production from urine for sulfide control in sewers

Zheng, Min, Zuo, Zhiqiang, Zhang, Yizhen, Cui, Yujia, Dong, Qian, Liu, Yanchen, Huang, Xia and Yuan, Zhiguo (2017) Nitrite production from urine for sulfide control in sewers. Water Research, 122 447-454. doi:10.1016/j.watres.2017.05.048


Author Zheng, Min
Zuo, Zhiqiang
Zhang, Yizhen
Cui, Yujia
Dong, Qian
Liu, Yanchen
Huang, Xia
Yuan, Zhiguo
Title Nitrite production from urine for sulfide control in sewers
Journal name Water Research   Check publisher's open access policy
ISSN 1879-2448
0043-1354
Publication date 2017-10-01
Sub-type Article (original research)
DOI 10.1016/j.watres.2017.05.048
Open Access Status Not yet assessed
Volume 122
Start page 447
End page 454
Total pages 8
Place of publication London, United Kingdom
Publisher I W A Publishing
Language eng
Abstract Most commonly used methods for sewer sulfide control involves dosing chemical agents to wastewater, which incurs high operational costs. Here, we propose and demonstrate a cost-effective and environmentally attractive approach to sewer sulfide control through urine separation and its subsequent conversion to nitrite prior to intermittent dosage to sewers. Urine collected from a male toilet urinal was fed to laboratory-scale sequencing batch reactors. The reactors stably converted roughly 50% of the nitrogen in urine to nitrite, with high abundance (at 17.46%) of known ammonia-oxidizing bacteria (AOB) of the genus Nitrosomonas, and absence (below detection level) of typical nitrite-oxidizing bacteria of the genus Nitrospira, according to 454 pyrosequencing analysis. The stable nitrite production was achieved at both relatively high (1.0-2.0 mg/L) and low (0.2-0.3 mg/L) dissolved oxygen concentrations. Dosing tests in laboratory-scale sewer systems confirmed the sulfide control effectiveness of free nitrous acid generated from urine. Life cycle assessment indicated that, compared with commodity chemicals, nitrite/free nitrous acid (FNA) production from urine for sulfide control in sewers would lower the operational costs by approximately 2/3 and greenhouse gas (GHG) emissions by 1/3 in 20 years.
Keyword Economic analysis
Free nitrous acid (FNA)
Life cycle assessment
Sulfide control
Urine separation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
Advanced Water Management Centre Publications
 
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