scholarly journals Enhancing nitrate and phosphorus removal from stormwater in fold-flow bioretention system with saturated zones

2021 ◽  
Author(s):  
Yang Ran ◽  
Zheng-rong Fu ◽  
Man-ying Ma ◽  
Xian Liu
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Stormwater Treatment ◽  
Nitrogen And Phosphorus ◽  
Runoff Water ◽  
Nitrogen And Phosphorus Removal ◽  
Bioretention System ◽  
Set Up ◽  
Sludge Particle

Abstract The traditional bioretention systems possess a remarkably low nitrogen and phosphorus removal effect. The removal rate fluctuates greatly, and even appears as negative removal of nitrogen and phosphorus. The four simulated bioretention experimental columns with different bilayer media, packing composition and structure were constructed. Based on the traditional fillers, the modified composite fillers with hydroxy-aluminum and modified vermiculite sludge particle (HAVSP) were added. The traditional filler (C1) and the modified composite filler (C2) were added respectively, moreover the saturated zones were set up to enhance the effect of nitrogen and phosphorus removal. Removal of nutrients from experimental columns by simulated runoff efficiency was evaluated and compared. In addition, the effect of media depth on phosphorus retention and denitrifying enzyme activity in bioretention columns was also evaluated. The experimental column #2 filled with C2 had the optimum removal effect on total phosphorus (93.70%), however, the removal effect of total phosphorus by filling C1 experimental columns was insufficient (57.36%). Designed to remove nitrate (NO3−-N) and total nitrogen (TN), the experimental column #4 showed the best performance (83.54% and 92.15%, respectively). In this study, we propose a fold-flow bioretention system by filling HAVSP in combination with saturated zones. The runoff water quality can be effectively improved, and a new bioretention cell configuration can be provided for efficient stormwater treatment.

Improvment of nitrogen and phosphorus removal in the anaerobic-oxic-anoxic-OXIC (AOAO) process by stepwise feeding

2000 ◽  
Vol 42 (3-4) ◽  
pp. 89-94 ◽  
Author(s):  
H.Y. Chang ◽  
C.F. Ouyang
Keyword(s):  
Carbon Source ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Feeding Strategy ◽  
Synthetic Wastewater ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Kjeldahl Nitrogen ◽  
P Removal

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.

Changes of pH in A2O Process System and its Impact on Nitrogen and Phosphorus Removal

2012 ◽  
Vol 588-589 ◽  
pp. 55-58
Author(s):  
Yong Feng Li ◽  
Jian Yu Yang ◽  
Guo Cai Zhang
Keyword(s):  
Phosphorus Removal ◽  
Ph Value ◽  
Removal Rate ◽  
Phosphorus Release ◽  
Ammonia Nitrogen ◽  
Biological Nutrient Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Process System ◽  
High Level

Simulate sewage were used in an anaerobic-anoxic-aerobic biological nutrient removal system(A2O process), by observing the pHs in different compartments and its reflected changes in nitrogen and phosphorus removal, studied on the effects of different pHs on the removal of pollutants. The experiments indicates that the anaerobic phosphorus release showed the main performance of the decline of pH, denitrification in anoxic zone caused the rise of pH, uptake of phosphate in the aerobic zone mainly caused the continuous rise of pH. There is no evidently changes in COD removal, ammonia nitrogen get the highest removal as the pH value was between 8.0-8.5, when pH was at 6.5-7.5, the TN have the maximum removal rate, TP can keep in a high level when the pH was above 6.0.

Two stage intermittent aeration membrane bioreactor for simultaneous organic, nitrogen and phosphorus removal

2000 ◽  
Vol 41 (10-11) ◽  
pp. 217-225 ◽  
Author(s):  
G.T. Seo ◽  
T.S. Lee ◽  
B.H. Moon ◽  
J.H. Lim ◽  
K.S. Lee
Keyword(s):  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Intermittent Aeration ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Aeration Conditions ◽  
Two Phases ◽  
Filtration Experiment

A submerged membrane bioreactor (SMBR) was operated in 2-stage intermittent aeration for simultaneous removal of organic matter, nitrogen and phosphorus. The system consists of two reactors with a total volume of 0.27 m3 (1st reactor 0.09 m3 and 2nd 0.18 m3). Real domestic wastewater was used as influent to the system. Membrane used for this experiment was hollow fiber polyethylene membrane with pore size of 0.1μm and effective surface area, 4 m2. The membrane was submerged in the 2nd reactor for suction type filtration. Experiment was carried out in two phases varying the time cycles of aeration and non-aeration. SRT was maintained at 25 days and HRT, 16–19 hours. MLSS concentration in the reactors was in the range of 2,700–3,400 mg/l. The MLSS internal recycling ratio was maintained at 100% of influent flow rate. When time cycles of aeration and non-aeration were set at 30/90 min and 60/60 min in reactor 1 and 2, the removal of BOD and COD was 98.3% and 95.6%, respectively. A relatively low nitrogen and phosphorus removal was observed in this condition (73.6% as T–N and 46.6% as T–P). However, with 60/60 min intermittent aeration conditions for both reactors, the removal rate of nitrogen and phosphorus for two weeks steady state were enhanced to 91.6% as TN and 66% as TP, respectively. Further a high organic removal (98% BOD and 96.2% COD) was achieved too. In these conditions, the membrane of flux declined from 0.1 m/d to 0.08 m/d and suction filtration was at 10–12 kPa for a month long operation period.

A Pilot Study on the Volume Ratio of Anaerobic / Anoxic / Aerobic in A2/O Process Influence on Nitrogen and Phosphorus Removal

2012 ◽  
Vol 518-523 ◽  
pp. 2980-2985
Author(s):  
Qiong Wan ◽  
Qian Feng ◽  
Dang Cong Peng ◽  
Shi Ping Jing
Keyword(s):  
Pilot Study ◽  
Phosphorus Removal ◽  
Pilot Plant ◽  
Removal Rate ◽  
Volume Ratio ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Average Value ◽  
Volume Rate ◽  
Aerobic Zone

The volume ratio of anaerobic/anoxic/aerobic was an important factor for the removal of nitrogen and phosphorus in the A2/O process. A pilot plant of A2/O process was built in Xi’an to do the research about the influence on nitrogen and phosphorus removal when the volume ratio of anaerobic/anoxic/aerobic was changed. When the HRT was 10.1h and the volume rate of anaerobic/anoxic/aerobic was 1/1.7/2.4, the removal rate of COD didn’t raise substantially than that of normal volume ratio A2/O process, the removal rate average value of TN and phosphorus were 61.5% and 85.4% respectively. On this condition, the HRT in aerobic zone shorted to 4.7h, energy was saved about 33.8% in comparing with that of conventional volume ratio A2/O process.

Research on the Fast Start-up of Anaerobic-Aerobic-Anoxic-Aerobic Sequencing Batch Reactor

2011 ◽  
Vol 374-377 ◽  
pp. 1013-1016
Author(s):  
Hui Yang ◽  
Yu Zhang ◽  
Yue Xu
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Start Up ◽  
Fast Start

Abstract. The paper aims to study the fast start-up of anaerobic-aerobic-anoxic-aerobic sequencing batch reactor, with domestic sewage as treating object, to solve the problem of SBR that can be used for denitrification or dephosphorization independently and to realize simultaneous nitrogen and phosphorus removal in a single SBR system. Phosphorus accumulating organisms were enriched at the anaerobic condition for 2h/aerobic for 3h after activated sludge were inoculated. Then denitrifying polyphosphate-accumulating organisms were enriched by inserting an anoxic phase into the aerobic phase. The lengths of anaerobic time, anoxic time and aerobic time were adjusted and the nitrogen and phosphorus removal effect of (AO)2SBR system were observed. The (AO)2SBR system was started successfully with 80d of training and domesticating. The nitrogen and phosphorus removal effect was performed preferably at the condition of anaerobic(2h)-aerobic(1.5h)-anoxic(1.5h)-aerobic(0.5h). The removal rate of COD, NH4+-N, TN and TP reached 90%, 97%, 88% and 92% respectively. And 33% of energy was saved when aerobic time was shortened from 3h to 2h, while the treating effect dropped off rarely. The results show that (AO)2SBR is applicable for simultaneous nitrogen and phosphorus removal, and the effluent water quality meets the first level B criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant(GB 18918-2002). The system can also reach the aim of saving energy and providing theoretical basis for the nitrogen and phosphorus removal in single SBR systems.

scholarly journals INVESTIGATION INTO BIOLOGICAL NUTRIENT REMOVAL FROM WASTEWATER

2005 ◽  
Vol 13 (4) ◽  
pp. 171-181 ◽  
Author(s):  
Giedre Vaboliene ◽  
Algirdas Bronislovas Matuzevičius
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Oxygen Demand ◽  
Biological Phosphorus Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Biological Nitrogen ◽  
Biological Phosphorus ◽  
Total P ◽  
Regressive Analysis

Nitrogen and phosphorus removal is necessary to avoid eutrophication of water bodies when treated wastewater is outlet to slowly flowing water bodies or recycled as technological water. The “BioBalance” technology as the latest way of nitrogen and phosphorus removal was applied at Utena Wastewater Treatment Plant. Composition of wastewater has an impact on biological phosphorus removal, particularly the ratio of biochemical oxygen demand and total phosphorus (BOD7/Total-P) in wastewater after mechanical treatment. Nitrates in the anaerobic zone can have a negative effect on biological phosphorus removal. Consequently, it is necessary to evaluate the impact of the mentioned factors on biological nitrogen and phosphorus removal. Biological nitrogen and phosphorus removal was evaluated and compared by using the “BioBalance” technology for biological nitrogen and phosphorus removal and technology before reconstruction during this investigation. The correlation regressive analysis of the biochemical oxygen demand and total phosphorus (BOD7/Total‐P) after mechanical treatment and the total phosphorus concentration in the effluent was evaluated. The correlation regressive analysis of nitrates in an anaerobic zone on the aeration tank and the efficiency of phosphorus removal was also evaluated.

High performance of nitrogen and phosphorus removal in an electrolysis-integrated biofilter

2016 ◽  
Vol 74 (3) ◽  
pp. 714-721 ◽  
Author(s):  
Y. Gao ◽  
Y. W. Xie ◽  
Q. Zhang ◽  
Y. X. Yu ◽  
L. Y. Yang
Keyword(s):  
Phosphorus Removal ◽  
High Performance ◽  
Removal Rate ◽  
Physical Adsorption ◽  
Chemical Precipitation ◽  
Ammonium Concentration ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Nitrite Removal ◽  
Nitrate And Nitrite

A novel electrolysis-integrated biofilter system was developed in this study to evaluate the intensified removal of nitrogen and phosphorus from contaminated water. Two laboratory-scale biofilter systems were established, one with electrolysis (E-BF) and one without electrolysis (BF) as control. The dynamics of intensified nitrogen and phosphorus removal and the changes of inflow and outflow water qualities were also evaluated. The total nitrogen (TN) removal rate was 94.4% in our newly developed E-BF, but only 74.7% in the control BF. Ammonium removal rate was up to 95% in biofilters with or without electrolysis integration with an influent ammonium concentration of 40 mg/L, and the accumulation of nitrate and nitrite was much lower in the effluent of E-BF than that of BF. Thus electrolysis plays an important role in TN removal especially the nitrate and nitrite removal. Phosphorus removal was significantly enhanced, exceeding 90% in E-BF by chemical precipitation, physical adsorption, and flocculation of phosphorus because of the in situ formation of ferric ions by the anodizing of sacrificial iron anodes. Results from this study indicate that the electrolysis integrated biofilter is a promising solution for intensified nitrogen and phosphorus removal.

Removal of nitrogen and phosphorus using a new biofilm-activated-sludge system

1996 ◽  
Vol 34 (1-2) ◽  
pp. 315-322 ◽  
Author(s):  
J. X. Liu ◽  
J. W. van Groenestijn ◽  
H. J. Doddema ◽  
B. Z. Wang
Keyword(s):  
Activated Sludge ◽  
Total Phosphorus ◽  
Phosphorus Removal ◽  
Domestic Wastewater ◽  
Optimum Conditions ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
The Mean ◽  
Scale Experiment ◽  
Biological Nitrogen

This paper describes a laboratory scale experiment using a combined biofilm and activated sludge process to enhance biological nitrogen and phosphorus removal. In the system, fibrous carriers were packed in an anoxic tank for the attached growth of denitrifying bacteria and the sludge of the clarifier was returned to the anaerobic tank to release phosphate. In this configuration, nitrification, denitrification and phosphorus removal could be performed at their respective optimum conditions. The influent was domestic wastewater; the mean concentrations of COD, NH4-N and total phosphorus in the influent were about 319 mg/l, 60 mg/l and 10 mg/l respectively. At a total HRT of the system of 20-30 hours, based on the influent flow of the system, and a temperature of 10-15°C, the mean concentrations of COD, NH4-N, NO3-N, NO2-N and total phosphorus in the effluent were about 39.4 mg/l, 1.3 mg/l, 13.4 mg/l, 0.6 mg/l, and 0.8 mg/l respectively.

Effect of Dissolved Oxygen on Nitrogen and Phosphorus Removal Rate in Biolak Process

2013 ◽  
Vol 779-780 ◽  
pp. 1629-1633
Author(s):  
Yu Kun Ju ◽  
He Li Wang ◽  
Qiang Zhang ◽  
Jia Le Xing
Keyword(s):  
Dissolved Oxygen ◽  
Removal Efficiency ◽  
Total Nitrogen ◽  
Phosphorus Removal ◽  
Removal Rate ◽  
Domestic Wastewater ◽  
Nitrogen Efficiency ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Oxic Zone

In this research, the domestic wastewater was treated by full-scale Biolak/A2O process. The effects of dissolved oxygen (DO) on nitrogen and phosphorus removal of the system in oxic zone were investigated. Controlling to DO at 0.8-1.5 mg/L, the treatment efficiency of system was near optimal with the total nitrogen efficiency of 69.45%. The simultaneous nitrification and denitrification could be achieved under this condition. Based on the calculation equations and transformation pathways of nutrients, about 23.71% total nitrogen (TN) was removed by multistage A/O system in the oxic tank. When DO was 1.0-3.0mg/L, the total phosphorus (TP) removal efficiency was the highest at 73.97%. DO in the range of 1.0-1.5mg/L was optimal for the nutrient removal in Biolak/A2O process, removal efficiency of TN and TP were 68.87% and 73.68%. TN and TP of the effluent were 12.02mg/L and 0.95mg/L, respectively.

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