| Title: |
Nitrite-dependent microbial utilization for simultaneous removal of sulfide and methane in sewers |
| Authors: |
Zhiqiang Zuo, Yaxin Xing, Xi Lu, Tao Liu, Min Zheng, Miao Guo, Yanchen Liu, Xia Huang |
| Source: |
Water Research X, Vol 24, Iss , Pp 100231- (2024) |
| Publisher Information: |
Elsevier, 2024. |
| Publication Year: |
2024 |
| Collection: |
LCC:Environmental technology. Sanitary engineering |
| Subject Terms: |
Sewer system, n-DAMO, Sulfide oxidation, Microbial utilization, Nitrite dosing, Integrated urban water management, Environmental technology. Sanitary engineering, TD1-1066 |
| More Details: |
Chemicals are commonly dosed in sewer systems to reduce the emission of hydrogen sulfide (H2S) and methane (CH4), incurring high costs and environmental concerns. Nitrite dosing is a promising approach as nitrite can be produced from urine wastewater, which is a feasible integrated water management strategy. However, nitrite dosing usually requires strict conditions, e.g., relatively high nitrite concentration (e.g., ∼200 mg N/L) and acidic environment, to inhibit microorganisms. In contrast to “microbial inhibition”, this study proposes “microbial utilization” concept, i.e., utilizing nitrite as a substrate for H2S and CH4 consumption in sewer. In a laboratory-scale sewer reactor, nitrite at a relatively low concentrations of 25–48 mg N/L was continuously dosed. Two nitrite-dependent microbial utilization processes, i.e., nitrite-dependent anaerobic methane oxidation (n-DAMO) and microbial sulfide oxidation, successfully occurred in conjunction with nitrite reduction. The occurrence of both processes achieved a 58 % reduction in dissolved methane and over 90 % sulfide removal in the sewer reactor, with microbial activities measured as 15.6 mg CH4/(L·h) and 29.4 mg S/(L·h), respectively. High copy numbers of n-DAMO bacteria and sulfide-oxidizing bacteria (SOB) were detected in both sewer biofilms and sediments. Mechanism analysis confirmed that the dosed nitrite at a relatively low level did not cause the inhibition of sulfidogenic process due to the downward migration of activity zones in sewer sediments. Therefore, the proposed “microbial utilization” concept offers a new alternative for simultaneous removal of sulfide and methane in sewers. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
2589-9147 |
| Relation: |
http://www.sciencedirect.com/science/article/pii/S2589914724000215; https://doaj.org/toc/2589-9147 |
| DOI: |
10.1016/j.wroa.2024.100231 |
| Access URL: |
https://doaj.org/article/7a2576bfc55040368ca6d225ac5577fa |
| Accession Number: |
edsdoj.7a2576bfc55040368ca6d225ac5577fa |
| Database: |
Directory of Open Access Journals |
