The Nitrogen and Phosphorus Removal and Sludge Yield Comparative Study under Anaerobic/Aerobic and Anaerobic/Anoxic Conditions

2012 ◽  
Vol 610-613 ◽  
pp. 2068-2073
Author(s):  
Ya Jing Li ◽  
Li Ping Sun ◽  
Min Ji
Keyword(s):  
Phosphorus Removal ◽  
Aerobic Condition ◽  
Anoxic Condition ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Anoxic Conditions ◽  
Significant Difference ◽  
Aerobic And Anaerobic

The nitrogen and phosphorus removal efficiency and effect of different electron acceptors (O2 and NO3-) on the sludge yield were studied through experiments in two SBRs (Sequencing Batch Reactors ) in this paper. The results showed that two systems both had good decontamination effect; the theory value of sludge yield (It was 0.435gVSS/gCOD and 0.402gVSS/gCOD for anaerobic /aerobic and anaerobic/anoxic condition, respectively) was higher than the actual value (It was 0.335gVSS/gCOD and 0.321g VSS/gCOD for anaerobic/aerobic and anaerobic/anoxic condition, respectively); There was no significant difference for the sludge yield under anaerobic/aerobic and anaerobic/anoxic conditions, because the endogenesis respiration of sludge under anaerobic/aerobic condition was stronger consequently more sludge being attenuated (Attenuation coefficient was 0.0081 and 0.0026 for anaerobic/aerobic and anaerobic/anoxic condition, respectively).

Simultaneous removal of nitrogen and phosphorus in a two-biofilter system

2000 ◽  
Vol 41 (12) ◽  
pp. 101-106 ◽  
Author(s):  
D. Pak ◽  
W. Chang
Keyword(s):  
Retention Time ◽  
Phosphorus Removal ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Aerobic Condition ◽  
Nitrogen Loading ◽  
Simultaneous Removal ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Factors Affecting

A two-biofilter system operated under alternate conditions of anaerobic/aerobic was tested to simultaneously remove nitrogen and phosphorus from sewage. The factors affecting simultaneous removal of nitrogen and phosphorus by the two-biofilter system were investigated. Those factors appeared to be influent COD/T-N and COD/T-P ratio, nitrogen loading rate and hydraulic retention time. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorus removal by the two-biofilter system. The amount of biomass wasted during the backwash procedure also affected total nitrogen and phosphorus removal by the system.

Nitrogen and Phosphorus Removal from Simulated Wastewater with Aquatic Macrophytes

2012 ◽  
Vol 518-523 ◽  
pp. 2597-2603
Author(s):  
Na He ◽  
Zhan Xiang Sun ◽  
Yu Long Zhang ◽  
Ming Da Liu
Keyword(s):  
Aquatic Plants ◽  
Phosphorus Removal ◽  
Aquatic Macrophytes ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Emergent Plants ◽  
N Removal ◽  
Significant Difference ◽  
Simulated Wastewater ◽  
Floating Plants

This study focused on the comparisons between nitrogen and phosphorus removal rates from the simulated wastewater using various kinds of aquatic plants (4 emergent and 3 floating plants). Results showed that aquatic plants has a significant effect on the removal of NO3--N and TP, but has a less effect on NH4+-N. Among the four emergent plants, the order of NO3--N removal capacities was: S. sagittifolia > S. tabernaemontani > T. latifolia > A. calamus. But for TP, the order was: T. latifolia > A. calamus > S. tabernaemontani > S. sagittifolia. To the floating plants, the order of NO3--N and TP removal capacities were: E. crassipes > P. stratiotes. The ANOVA analyses showed that there was a significant difference between planted treatments and unplanted treatment for the removal of NO3--N and TP. The study suggests that the treatment of simulated wastewater using the aquatic macrophytes was effective in the removal of nutrients.

Soft sensors for control of nitrogen and phosphorus removal from wastewaters by neural networks

2002 ◽  
Vol 45 (4-5) ◽  
pp. 101-107 ◽  
Author(s):  
L. Luccarini ◽  
E. Porrà ◽  
A. Spagni ◽  
P. Ratini ◽  
S. Grilli ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Biological Nutrient Removal ◽  
Batch Reactors ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Oxidation Reduction ◽  
Oxidation Reduction Potential ◽  
Removal Processes ◽  
Pollutants Removal ◽  
Biological Nitrogen

In this paper, we describe the results of research aimed to evaluate the possibility of using a neural network (NN) model for predicting biological nitrogen and phosphorus removal processes in activated sludge, utilising oxidation reduction potential (ORP) and pH as NN inputs. Based on N and P concentrations predictions obtained via the NN, a strategy for controlling sequencing batch reactors (SBRs) phases duration, optimising pollutants removal and saving energy, is proposed. The NN model allowed us to reproduce the concentration trends (change in slope, or process end), with satisfactory accuracy. The NN results were generally in good agreement with the experimental data. These results demonstrated that NN models can be used as “soft on-line sensors” for controlling biological processes in SBRs. By monitoring ORP and pH, it is possible to recognise the N and P concentrations during different SBRs phases and, consequently, to identify the end of the biological nutrient removal processes. This information can then be used to design control systems.

Use of a new anaerobic-aerobic sequencing batch reactor system to enhance biological phosphorus removal

1997 ◽  
Vol 35 (1) ◽  
pp. 137-144 ◽  
Author(s):  
Shahnaz Danesh ◽  
Jan A. Oleszkiewicz
Keyword(s):  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Significant Difference ◽  
Acid Fermenter ◽  
Biological Phosphorus ◽  
Enhance Biological Phosphorus Removal

A two-stage anaerobic-aerobic sequencing batch reactor (SBR) system (PAF-SBR) was developed to enhance biological phosphorus removal in the sequencing batch reactors. The system performance was evaluated against a conventional SBR system in parallel lab-scale reactors at room temperature, using the degritted raw wastewater as the feed. The SRT for the anaerobic SBR which is named PAF (Primary Acid Fermenter) was 12 days, and for both the BNR reactors was 10 days. All reactors were run at 3 cycles per day. A significant difference (P=0.01) was observed between the performances of the two systems. The Ortho-P concentration in the effluent from the PAF-SBR was mostly below 0.5 mg/L while in the conventional SBR was generally above 1.5 mg/L. Lack of availability of carbon (mean VFA/PSol.=1.1) and long anoxic/anaerobic period were the major causes of inefficient removal of phosphorus in the conventional SBR system. The use of anaerobic stage however increased the mean VFA/PSol. to 11.3 which enhanced Bio-P removal in the PAF-SBR system. Prefermentation also improved the sludge consistency and settleability in the following SBR unit. The results indicated that by using the perfermentation step, the anoxic/anaerobic period in the BNR-SBR could be controlled and reduced to less than 50 minutes, which would reduce the total cycle time from 8 hr to 6 hr.

Comparison between UCT type and DPAO biomass phosphorus removal efficiency under aerobic and anoxic conditions

2009 ◽  
Vol 60 (10) ◽  
pp. 2695-2703 ◽  
Author(s):  
A. G. Kapagiannidis ◽  
I. Zafiriadis ◽  
A. Aivasidis
Keyword(s):  
Removal Efficiency ◽  
Phosphorus Removal ◽  
P Uptake ◽  
Batch Reactors ◽  
Biological Phosphorus Removal ◽  
Anoxic Conditions ◽  
Uptake Rates ◽  
Significant Difference ◽  
University Of Cape Town ◽  
Biological Phosphorus

Two different types of biomass, capable for Enhanced Biological Phosphorus Removal (EBPR), a UCT (University of Cape Town) type and a sludge enriched with DPAOs (Denitrifying Phosphorus Accumulating Organisms) were tested in batch reactors under specific operational and environmental conditions, in order to achieve a direct comparison of their phosphorus removal capability. Three types of batch reactors were operated, Anaerobic/Oxic (AO), Anaerobic/Anoxic (A2) and Anaerobic/Anoxic/Oxic (A2O), under controlled temperature and pH conditions. Maximum anaerobic specific phosphate release, substrate utilization, as well as denitrification and phosphate uptake rates under aerobic and anoxic conditions were determined and compared for the two different microbial populations. Experimental results indicated no significant difference between the anoxic and the aerobic phosphorus (P) uptake rates, respectively for DPAO and UCT sludge. The UCT sludge was also found to achieve anoxic P uptake, however to much less extend compared to the DPAO sludge. It has also been proved that anoxic P uptake seems to negatively affect the total P removal efficiency of this type of sludge, even under following aerobic conditions. Based on these findings, denitrifying phosphorus removal systems are proved comparable to conventional EBPR configurations (UCT), concerning phosphorus removal efficiency, while their operation is accompanied by potential advantages.

Nitrogen and Phosphorus Removal by Activated Sludge Process: A Review

2017 ◽  
Vol 14 (2) ◽  
pp. 99-106 ◽  
Author(s):  
Zhengan Zhang ◽  
Shulin Pan ◽  
Fei Huang ◽  
Xiang Li ◽  
Juanfang Shang ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Activated Sludge Process ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal

Nitrogen and Phosphorus Removal by Submerged Membrane Bioreactor

2004 ◽  
Vol 31 (4) ◽  
pp. 349-356
Author(s):  
Li Na ◽  
Li Zhidong ◽  
Li Guode ◽  
Wang Yan ◽  
Wu Shiwei ◽  
...  
Keyword(s):  
Phosphorus Removal ◽  
Membrane Bioreactor ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Submerged Membrane Bioreactor

New German design guideline for single stage activated sludge plants

2000 ◽  
Vol 41 (9) ◽  
pp. 139-145
Author(s):  
R. Kayser
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Design Procedure ◽  
Single Stage ◽  
Nitrogen And Phosphorus ◽  
Nitrogen And Phosphorus Removal ◽  
Design Guideline

The German design guideline A 131 “Design of single stage activated sludge plants” was amended in 1999. The main changes of the guideline from 1991 are outlined. The design procedure for plants with nitrogen and phosphorus removal is presented.

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