Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives
Deammonification for nitrogen removal in municipal wastewater in temperate and cold climate zones is currently limited to the side stream of municipal wastewater treatment plants (MWWTP). This study developed a conceptual model of a mainstream deammonification plant, designed for 30,000 P.E., consid...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-04-01
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| Series: | Frontiers in Microbiology |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmicb.2023.1155235/full |
| _version_ | 1827969608372453376 |
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| author | Dheeraja Cheenakula Kai Griebel David Montag Markus Grömping |
| author_facet | Dheeraja Cheenakula Kai Griebel David Montag Markus Grömping |
| author_sort | Dheeraja Cheenakula |
| collection | DOAJ |
| description | Deammonification for nitrogen removal in municipal wastewater in temperate and cold climate zones is currently limited to the side stream of municipal wastewater treatment plants (MWWTP). This study developed a conceptual model of a mainstream deammonification plant, designed for 30,000 P.E., considering possible solutions corresponding to the challenging mainstream conditions in Germany. In addition, the energy-saving potential, nitrogen elimination performance and construction-related costs of mainstream deammonification were compared to a conventional plant model, having a single-stage activated sludge process with upstream denitrification. The results revealed that an additional treatment step by combining chemical precipitation and ultra-fine screening is advantageous prior the mainstream deammonification. Hereby chemical oxygen demand (COD) can be reduced by 80% so that the COD:N ratio can be reduced from 12 to 2.5. Laboratory experiments testing mainstream conditions of temperature (8–20°C), pH (6–9) and COD:N ratio (1–6) showed an achievable volumetric nitrogen removal rate (VNRR) of at least 50 gN/(m3∙d) for various deammonifying sludges from side stream deammonification systems in the state of North Rhine-Westphalia, Germany, where m3 denotes reactor volume. Assuming a retained Norganic content of 0.0035 kgNorg./(P.E.∙d) from the daily loads of N at carbon removal stage and a VNRR of 50 gN/(m3∙d) under mainstream conditions, a resident-specific reactor volume of 0.115 m3/(P.E.) is required for mainstream deammonification. This is in the same order of magnitude as the conventional activated sludge process, i.e., 0.173 m3/(P.E.) for an MWWTP of size class of 4. The conventional plant model yielded a total specific electricity demand of 35 kWh/(P.E.∙a) for the operation of the whole MWWTP and an energy recovery potential of 15.8 kWh/(P.E.∙a) through anaerobic digestion. In contrast, the developed mainstream deammonification model plant would require only a 21.5 kWh/(P.E.∙a) energy demand and result in 24 kWh/(P.E.∙a) energy recovery potential, enabling the mainstream deammonification model plant to be self-sufficient. The retrofitting costs for the implementation of mainstream deammonification in existing conventional MWWTPs are nearly negligible as the existing units like activated sludge reactors, aerators and monitoring technology are reusable. However, the mainstream deammonification must meet the performance requirement of VNRR of about 50 gN/(m3∙d) in this case. |
| first_indexed | 2024-04-09T18:40:17Z |
| format | Article |
| id | doaj.art-12a5719a806d4d51a808b7b2feada14e |
| institution | Directory Open Access Journal |
| issn | 1664-302X |
| language | English |
| last_indexed | 2024-04-09T18:40:17Z |
| publishDate | 2023-04-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Microbiology |
| spelling | doaj.art-12a5719a806d4d51a808b7b2feada14e2023-04-11T05:34:50ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2023-04-011410.3389/fmicb.2023.11552351155235Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectivesDheeraja Cheenakula0Kai Griebel1David Montag2Markus Grömping3Institute NOWUM-Energy, FH Aachen, University of Applied Sciences, Jülich, GermanyInstitute of Environmental Engineering, RWTH Aachen, Aachen, GermanyInstitute of Environmental Engineering, RWTH Aachen, Aachen, GermanyInstitute NOWUM-Energy, FH Aachen, University of Applied Sciences, Jülich, GermanyDeammonification for nitrogen removal in municipal wastewater in temperate and cold climate zones is currently limited to the side stream of municipal wastewater treatment plants (MWWTP). This study developed a conceptual model of a mainstream deammonification plant, designed for 30,000 P.E., considering possible solutions corresponding to the challenging mainstream conditions in Germany. In addition, the energy-saving potential, nitrogen elimination performance and construction-related costs of mainstream deammonification were compared to a conventional plant model, having a single-stage activated sludge process with upstream denitrification. The results revealed that an additional treatment step by combining chemical precipitation and ultra-fine screening is advantageous prior the mainstream deammonification. Hereby chemical oxygen demand (COD) can be reduced by 80% so that the COD:N ratio can be reduced from 12 to 2.5. Laboratory experiments testing mainstream conditions of temperature (8–20°C), pH (6–9) and COD:N ratio (1–6) showed an achievable volumetric nitrogen removal rate (VNRR) of at least 50 gN/(m3∙d) for various deammonifying sludges from side stream deammonification systems in the state of North Rhine-Westphalia, Germany, where m3 denotes reactor volume. Assuming a retained Norganic content of 0.0035 kgNorg./(P.E.∙d) from the daily loads of N at carbon removal stage and a VNRR of 50 gN/(m3∙d) under mainstream conditions, a resident-specific reactor volume of 0.115 m3/(P.E.) is required for mainstream deammonification. This is in the same order of magnitude as the conventional activated sludge process, i.e., 0.173 m3/(P.E.) for an MWWTP of size class of 4. The conventional plant model yielded a total specific electricity demand of 35 kWh/(P.E.∙a) for the operation of the whole MWWTP and an energy recovery potential of 15.8 kWh/(P.E.∙a) through anaerobic digestion. In contrast, the developed mainstream deammonification model plant would require only a 21.5 kWh/(P.E.∙a) energy demand and result in 24 kWh/(P.E.∙a) energy recovery potential, enabling the mainstream deammonification model plant to be self-sufficient. The retrofitting costs for the implementation of mainstream deammonification in existing conventional MWWTPs are nearly negligible as the existing units like activated sludge reactors, aerators and monitoring technology are reusable. However, the mainstream deammonification must meet the performance requirement of VNRR of about 50 gN/(m3∙d) in this case.https://www.frontiersin.org/articles/10.3389/fmicb.2023.1155235/fullanammoxenergy efficiencymainstream deammonificationnitrogen eliminationwastewater |
| spellingShingle | Dheeraja Cheenakula Kai Griebel David Montag Markus Grömping Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives Frontiers in Microbiology anammox energy efficiency mainstream deammonification nitrogen elimination wastewater |
| title | Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives |
| title_full | Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives |
| title_fullStr | Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives |
| title_full_unstemmed | Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives |
| title_short | Concept development of a mainstream deammonification and comparison with conventional process in terms of energy, performance and economical construction perspectives |
| title_sort | concept development of a mainstream deammonification and comparison with conventional process in terms of energy performance and economical construction perspectives |
| topic | anammox energy efficiency mainstream deammonification nitrogen elimination wastewater |
| url | https://www.frontiersin.org/articles/10.3389/fmicb.2023.1155235/full |
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