Nitrogen and Phosphorus Removal by GAOs and PAOs Using Nitrate and Limited Oxygen as Electron Acceptors Simultaneously and the Impact of External Carbon Source in The Anoxic Phase

This investigation incorporated a stepwise feeding strategy into the biological process containing anaerobic/oxide/anoxic/oxide (AOAO) stages to enhance nitrogen and phosphorus removal efficiencies. Synthetic wastewater was fed into the experimental reactors during the anaerobic and anoxic stages and the substrates/nutrients were successfully consumed without recycling either nitrified effluent or external carbon source. An intrinsic sufficient carbon source developed during the anoxic stage and caused the NOx (NO2-N+NO3-N) concentration to be reduced from 11.85mg/l to 5.65mg/l. The total Kjeldahl nitrogen (TKN) removal rate was between 81.81%∼93.96% and the PO4-P removal ratio ranged from 93%∼100%. The substrate fed into the anaerobic with a Q1 flow rate and a Q2 into the anoxic reactor. The three difference experiments contained within this study produced Q1/Q2 that varied from 7/3, 8/2, and 9/1. The AOAO process saved nearly one-third of the energy compared with typical biological nutrient removal (BNR) system A2O processes.

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The impact of wastewater characteristics, algal species selection and immobilisation on simultaneous nitrogen and phosphorus removal

Algal Research ◽

10.1016/j.algal.2018.01.009 ◽

2018 ◽

Vol 31 ◽

pp. 478-488 ◽

Cited By ~ 21

Author(s):

Matthew Kube ◽

Bruce Jefferson ◽

Linhua Fan ◽

Felicity Roddick

Keyword(s):

Phosphorus Removal ◽

Algal Species ◽

Species Selection ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

The Impact

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Co-optimisation of phosphorus and nitrogen removal in stormwater biofilters: the role of filter media, vegetation and saturated zone

Water Science & Technology ◽

10.2166/wst.2014.117 ◽

2014 ◽

Vol 69 (9) ◽

pp. 1961-1969 ◽

Cited By ~ 23

Author(s):

Bonnie J. Glaister ◽

Tim D. Fletcher ◽

Perran L. M. Cook ◽

Belinda E. Hatt

Keyword(s):

Water Quality ◽

Nutrient Removal ◽

Phosphorus Removal ◽

Saturated Zone ◽

Filter Media ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Quality Guidelines ◽

The Impact

Biofilters have been shown to effectively treat stormwater and achieve nutrient load reduction targets. However, effluent concentrations of nitrogen and phosphorus typically exceed environmental targets for receiving water protection. This study investigates the role of filter media, vegetation and a saturated zone (SZ) in achieving co-optimised nitrogen and phosphorus removal in biofilters. Twenty biofilter columns were monitored over a 12-month period of dosing with semi-synthetic stormwater. The frequency of dosing was altered seasonally to examine the impact of hydrologic variability. Very good nutrient removal (90% total phosphorus, 89% total nitrogen) could be achieved by incorporating vegetation, an SZ and Skye sand, a naturally occurring iron-rich filter medium. This design maintained nutrient removal at or below water quality guideline concentrations throughout the experiment, demonstrating resilience to wetting–drying fluctuations. The results also highlighted the benefit of including an SZ to maintain treatment performance over extended dry periods. These findings represent progress towards designing biofilters which co-optimise nitrogen and phosphorus removal and comply with water quality guidelines.

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Enhancing nitrogen and phosphorus removal in the BUCT–IFAS process by bypass flow strategy

Water Science & Technology ◽

10.2166/wst.2015.242 ◽

2015 ◽

Vol 72 (4) ◽

pp. 528-534 ◽

Cited By ~ 5

Author(s):

Yang Bai ◽

Xie Quan ◽

Yaobin Zhang ◽

Shuo Chen

Keyword(s):

Carbon Source ◽

Removal Efficiency ◽

Phosphorus Removal ◽

P Uptake ◽

Flow Mode ◽

Bypass Flow ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

University Of Cape Town ◽

P Removal

A University of Cape Town process coupled with integrated fixed biofilm and activated sludge system was modified by bypass flow strategy (BUCT–IFAS) to enhance nitrogen and phosphorus removal from the wastewater containing insufficient carbon source. This process was operated under different bypass flow ratios (λ were 0, 0.4, 0.5, 0.6 and 0.7, respectively) to investigate the effect of different operational modes on the nitrogen (N) and phosphorus (P) removal efficiency (λ = 0 was noted as common mode, other λ were noted as bypass flow mode), and optimizing the N and P removal efficiency by altering the λ. Results showed that the best total nitrogen (TN) and total phosphorus (TP) removal performances were achieved at λ of 0.6, the effluent TN and TP averaged 14.0 and 0.4 mg/L meeting discharge standard (TN < 15 mg/L, TP < 0.5 mg/L). Correspondingly, the TN and TP removal efficiencies were 70% and 94%, respectively, which were 24 and 41% higher than those at λ of 0. In addition, the denitrification and anoxic P-uptake rates were increased by 23% and 23%, respectively, compared with those at λ of 0. These results demonstrated that the BUCT–IFAS process was an attractive method for enhancing nitrogen and phosphorus removal from wastewater containing insufficient carbon source.

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The Recovery and Synthesis of Polyhydroxyalkanoates in the Process of Nitrogen and Phosphorus Removal in Low-Carbon Sewage Based on pH and Nitrogen and Phosphorus Restriction Under Anaerobic-Oxygen Limited Process

10.21203/rs.3.rs-974170/v1 ◽

2021 ◽

Author(s):

Kequan Zhang ◽

Qian Fang ◽

Yihan Xie ◽

Yujia Chen ◽

Tong Wei ◽

...

Keyword(s):

Carbon Source ◽

Phosphorus Removal ◽

Ph Value ◽

Source Control ◽

Low Carbon ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Urban Sewage ◽

Dry Cell Weight ◽

Limited Process

Abstract Polyhydroxyalkanoate (PHA) is a new type of bio-polyester which is expected to replace traditional petroleum-based plastics. It is also a critical transformation hub of carbon source in nitrogen and phosphorus removal in sewage. Based on the anaerobic-oxygen limited process, the experiment took organic solid waste fermentation liquid as carbon source control hub and realized PHA synthesis and recovery in denitrification and phosphorus removal from low carbon sewage the SBR reactor by regulating pH value and nitrogen and phosphorus restriction. The experimental results showed that when the ratio of C/N and C/P was 150, the content of PHA accounted for 50.39% and 36.07 of the dry cell weight, respectively. Besides, it was found that increasing the C/N ratio was beneficial to increasing the proportion of PHV in PHA. This study proved the feasibility of using an anaerobic-oxygen limited process to recover PHA in nitrogen and phosphorus removal from low-carbon sewage, which saves gas and reduces energy consumption. At the same time, it also provides some help for the follow-up study of low-carbon urban sewage nitrogen and phosphorus removal coupled with resource recovery of PHA to guide the water industry economy to develop in a circular and sustainable direction

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Effect of Carbon Source on Biological Nitrogen and Phosphorus Removal in an Anaerobic-Anoxic-Oxic (A2O) Process

Journal of Environmental Engineering ◽

10.1061/(asce)ee.1943-7870.0000262 ◽

2010 ◽

Vol 136 (11) ◽

pp. 1248-1254 ◽

Cited By ~ 9

Author(s):

Chang-Yong Wu ◽

Yong-Zhen Peng ◽

Xiao-Ling Li ◽

Shu-Ying Wang

Keyword(s):

Carbon Source ◽

Phosphorus Removal ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Biological Nitrogen ◽

A2o Process

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Enhance biological nitrogen and phosphorus removal in wastewater treatment process by adding food waste fermentation liquid as external carbon source

Biochemical Engineering Journal ◽

10.1016/j.bej.2020.107811 ◽

2021 ◽

Vol 165 ◽

pp. 107811 ◽

Cited By ~ 1

Author(s):

Xiao-Chi Feng ◽

Xian Bao ◽

Lin Che ◽

Qing-Lian Wu

Keyword(s):

Wastewater Treatment ◽

Carbon Source ◽

Food Waste ◽

Phosphorus Removal ◽

Treatment Process ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Wastewater Treatment Process ◽

Fermentation Liquid ◽

Biological Nitrogen

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Another carbon source for BNR system

Water Science & Technology ◽

10.2166/wst.1996.0392 ◽

1996 ◽

Vol 34 (1-2) ◽

pp. 363-369 ◽

Cited By ~ 2

Author(s):

E. Choi ◽

H. S. Lee ◽

J. W. Lee ◽

S. W. Oa

Keyword(s):

Carbon Source ◽

Activated Sludge ◽

Phosphorus Removal ◽

Organic Loading ◽

Nitrogen And Phosphorus ◽

Nitrogen And Phosphorus Removal ◽

Loading Rates ◽

Study Results ◽

Removal Efficiencies ◽

Low Strength

It has been known wastewater with low COD/TKN ratio produces higher effluent NO3-N and adversely affects poly P microbes returning it to an anaerobic stage in BNR systems. Nightsoil applicability to return activated sludge line to minimize NO3-N effect to poly P microbes in anaerobic stage was examined with laboratory BNR systems operated at 20°C. The study results indicated nightsoil application could improve nitrogen and phosphorus removal efficiencies both with low strength settled municipal and piggery wastes presenting low COD/TKN ratios of 6 and 2.2, respectively. Even organic loading rates increased to 20 to 60% due to nightsoil application, the effluent COD increased only 10 to 20%. This would suggest nightsoil can be used as another carbon source and nightsoil application to return activated sludge line can be another alternative modification to improve BNR systems.

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