Interaction of denitrification and P removal in anoxic P removal systems

Patel, Jignesh; Nakhla, George

doi:10.1016/j.desal.2006.03.522

Cited by 21 publications

(6 citation statements)

References 36 publications

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“…Most COD was soluble (71%), regarding the values of COD and COD S at the pipe inlet, and no variation in the percentage of soluble organic matter was observed during transportation. In order to estimate the amount of COD consumed in denitrification an average stoichiometric consumption ratio of 7 g COD/g NO 3 -N has been used [28], which is within the range of data found in literature (8.7 g COD/g NO 3 -N [18], 6 g soluble COD/g NO 3 -N [29], 7.7 g COD/g NO 3 -N [30]). On the other hand, for the estimation of the COD consumed in the nitrite reduction it has been taken into account that the denitrification via nitrite leads to a 40% reduction in the demand of carbon source [31].…”

Section: Anoxic Organic Matter Reductionmentioning

confidence: 99%

Nitrogen transformation of reclaimed wastewater in a pipeline by oxygen injection

Rodríguez-Gómez

Alvarez

Rodríguez‐Sevilla

et al. 2009

Environmental Technology

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A study of oxygen injection was performed in a completely filled gravity pipe, which is part of the South Tenerife reclaimed wastewater reuse scheme (Spain), in order to inhibit the appearance of anaerobic conditions by a nitrification-denitrification process. The pipe was 0.6 m in diameter and 62 km long and made of cast iron with a concrete inner coating, A high-pressure oxygen injection system was installed at 16 km from the pipe inlet, where severe anaerobic conditions appear. Experiments on oxygen injection were carried out with three different concentrations (7, 15 and 30 mg l(-1) O2). In all experiments, oxygen dissolved properly after injection, and no gas escapes were detected during water transportation. Most oxygen was consumed in the nitrification process, due to the low COD/NH4-N ratio, leading to a maximum production of oxidized nitrogen compounds of 7.5 mg l(-1) NO(x)-N with the 30 mg l(-1) O2 dose. Nitrification occured with nitrite accumulation, attributed to the presence of free ammonia within the range 1.2-1.4 mg l(-). Once the oxygen had been consumed, an apparent half-order denitrification took place, with limitation of biodegradable organic matter. The anoxic conditions led to a complete inhibition of sulphide generation.

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Section: Anoxic Organic Matter Reductionmentioning

confidence: 99%

Nitrogen transformation of reclaimed wastewater in a pipeline by oxygen injection

Rodríguez-Gómez

Alvarez

Rodríguez‐Sevilla

et al. 2009

Environmental Technology

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“…4b). According to Patel and Nakhla (2006), the effective P removal selectively requires the existence of short chain fatty acids and hence the nature of the organic substance plays a key role in P removal.…”

Section: Denitrification and Organic Matter Removalmentioning

confidence: 99%

Nutrient Biological Removal in an Up-flow Sludge Bed Reactor under Intermittent Aeration using Glycerol as the Sole Carbon Source

Carneiro

Foresti

2017

Braz. J. Chem. Eng.

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This work evaluated the feasibility of glycerol as the sole carbon source for nutrient biological removal in an intermittently aerated bioreactor. The reactor operation was divided into two phases: the first one aimed only at removing nitrogen; and the second one aimed at removing nitrogen and phosphorus. In the first operational phase, three C/N (Carbon / Nitrogen) ratios were tested: 1.2, 1.5 and 1.8. For a C/N ratio of 1.8, higher denitrification efficiency was achieved (91 ± 8%). During the second phase, the reactor was subjected to periods of aeration and non-aeration of 2 h and 4 h, respectively, for a C/P (Carbon / Phosphorus) ratio of 10. The biological phosphorus removal in this phase was not significant (12 ± 9%), indicating that there was no development of PAO (Phosphorus Accumulating Organisms), since phosphate release did not occur during the anaerobic phase. This can be explained by the lack of VFA (Volatile Fatty Acids), which should come from the anaerobic degradation of the remaining amount of glycerol after denitrification was completed. The optical microscopy analysis indicated the presence of filamentous bacteria similar to the genus Beggiatoa, which could also have consumed part of the substrates from the glycerol fermentation.

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“…[8][9][10] The main restraint of this technology, however, is the low efficiency of nitrogen and phosphorus compounds removal that results mainly from the insufficient quantity of available carbon. [11][12][13] Hence, a tangible need emerges for solutions that would improve the technological and economic effectiveness of typical SBRs. An alternative solution presented in this work involves the integration of an SBR with a hydrophyte system (HS).…”

Section: Introductionmentioning

confidence: 99%

“…(1) AST, (2) HST, (3) plant-supporting grid, (4) stirrer, (5) aerating pump in tight case, (6) aerator, (7) ventilation valve, (8) gas sampling ports, (9) discharge of treated wastewaters, (10) tank with crude wastewaters,(11) stems and leaves of tested aquatic plants and(12) roots of tested aquatic plants.…”

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confidence: 99%

Effectiveness of dairy wastewater treatment in a bioreactor based on the integrated technology of activated sludge and hydrophyte system

Dębowski

Zieliński

Krzemieniewski

et al. 2014

Environmental Technology

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The aim of this study was to determine the effectiveness of dairy wastewater treatment in the integrated technology based on the simultaneous use of the activated sludge method (AS) and a hydrophyte system (HS) (AS-HS), in this case, common reed (Phragmites australis) or common cattail (Typha latifolia). Experiments were conducted in an innovative reactor exploited in the fractional-technical scale at the loads of 0.05 mg BOD5/mg.d.m. d (biochemical oxygen demand) and 0.10 mg BOD5/mg.d.m d. The AS--HS enabled improving the removal effectiveness ofbiogenes characterized by concentrations of Ntot., N-NH4 and Ptot. In contrast, the integrated system had no significant reducing effect either on concentrations of organic compounds characterized by BOD5 and chemical oxygen demand parameters or on the structure of AS in the sequencing batch-type reactors.

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Interaction of denitrification and P removal in anoxic P removal systems

Cited by 21 publications

References 36 publications

Nitrogen transformation of reclaimed wastewater in a pipeline by oxygen injection

Nitrogen transformation of reclaimed wastewater in a pipeline by oxygen injection

Nutrient Biological Removal in an Up-flow Sludge Bed Reactor under Intermittent Aeration using Glycerol as the Sole Carbon Source

Effectiveness of dairy wastewater treatment in a bioreactor based on the integrated technology of activated sludge and hydrophyte system

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