Nitrate reduction in a simulated free-water surface wetland system

Misiti, Teresa; Hajaya, Malek G.; Pavlostathis, Spyros G.

doi:10.1016/j.watres.2011.08.019

Cited by 33 publications

(21 citation statements)

References 23 publications

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“…Sirivedhin and Gray (2006) reported that the potential denitrification rate increased more than two orders of magnitude when the temperature rose from 4 • C to 25 • C. Value of 15 • C was usually selected as a bound above which efficient nitrogen removal could be achieved owing to the properly functioned microorganisms and vegetation (Kuschk et al, 2003;Kadlec and Wallace, 2009;Kotti et al, 2010). In this study, k values declined sharply when the temperature decreased from 15 • C to lower than 10 • C in autumn, and almost no nitrogen removal occurred in winter with temperatures consistently below 10 • C. This finding was in agreement with Misiti et al (2011). Inhibited activity of denitrifying bacteria was the primary reason for poor nitrate removal at low temperature alone with plant senescence (Mitsch and Gosselink, 2000;Hernandez and Mitsch, 2007).…”

Section: Crucial Influencing Factors For Nitrogen Removalsupporting

confidence: 88%

“…Moreover, carbon source has been substantially proven to be a crucial limiting factor for nitrate removal (Gersberg et al, 1983;Ingersoll and Baker, 1998;Gagnon et al, 2010;Kozub and Liehr, 1999), especially when the COD:N was below 3:1 (Misiti et al, 2011). The favorable COD:N for denitrification in CWs was reported to be 3:1-7:1 in the references (Ingersoll and Baker, 1998;Lin et al, 2002;Gagnon et al, 2010;Misiti et al, 2011;Narváez et al, 2011).…”

Section: Nitrogen Removal Performancementioning

confidence: 99%

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Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Chang

Dai

et al. 2013

Ecological Engineering

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Section: Crucial Influencing Factors For Nitrogen Removalsupporting

confidence: 88%

Section: Nitrogen Removal Performancementioning

confidence: 99%

Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Chang

Dai

et al. 2013

Ecological Engineering

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“…This failure is strongly proven to be the main limitation in promoting nitrogen removal. Misiti et al (2011) reported the severe impact of a COD/T-N value of below 3 on denitrification. In the current study, the mean COD/T-N values in the two VBFs were 6.6 and 3.6 (Table 4).…”

Section: Nitrogen Speciationmentioning

confidence: 99%

Study of nitrogen removal performance in pilot-scale multi-stage vermi-biofilter: operating conditions impacts and nitrogen speciation transformation

et al. 2015

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The present work investigates pollutant removal and the transformation of nitrogen from sewage wastewater using a pilot-scale multi-stage bio-vermifilter system. Over a study period of 48 weeks, the pollutant removal performance of the system was measured and the effects of hydraulic loading rate (HLR) and dry-wet ratio (D/W) were estimated. The relationship between oxygen transfer rate and load of oxygen necessity was calculated and analysed for system optimisation. The method for diluting the isotope d 15 N-NO 3 -was applied to study nitrogen transfer. Moreover, statistical correlations were analysed to determine the crucial factors which influence nitrogen transfer efficiency. The system removes pollutants efficiently; specifically, the average removal efficiencies are 94.2 % for chemical oxygen demand (COD), 93.3 % for NH 4 ? -N, and 58.2 % for total nitrogen (T-N). Lowering HLR and D/W can enhance nitrogen removal. Nitrogen speciation and transformation were examined under an optimised condition with an HLR of 0.36 m day -1 and a D/W of 3. The results of isotope d 15 N-NO 3 -dilution showed that NO 3 --N was mainly produced in trickling bio-filter and vermibio-filter (VBF)

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“…8). A C/N ratio of less than 5 is believed to be obstructive to the reduction of nitrates (Misiti et al (2011)). However, TN concentrations in the effluent were mostly below 20 mg/L, meeting the category 1B standard of GB 18918-2002.…”

Section: Pilot-scale Experimentsmentioning

confidence: 99%

Tower bio-vermifilter system for rural wastewater treatment: bench-scale, pilot-scale, and engineering applications

Nie

Wang

Yang

et al. 2014

Int. J. Environ. Sci. Technol.

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This paper presents a systematic study of a novel tower bio-vermifilter system for rural wastewater treatment at three scales: bench-scale, pilot-scale, and engineering applications. First, three types of bioreactors were tested in the bench-scale experiments: earthworm bioreactor, soil filter, and one-stage bio-vermifilter. Experiments with the earthworm bioreactor and soil filter determined the optimum earthworm density and soil layer depth to be 12.5 g/L and 40 cm, respectively. The onestage bio-vermifilter's poor performance in removing nitrogen and phosphorous led to several improvements in the design of the pilot tower bio-vermifilter system including the addition of one anaerobic biofilter for pretreatment, the use of two stages of bio-vermifilters, and the replacement of gravel with ceramsite in the media. Second, a pilot tower bio-vermifilter system built in Yixing City of Jiangsu province showed a good performance in the removal of chemical oxygen demand, ammonium nitrogen, and phosphorous. However, the system's removal of total nitrogen showed considerable fluctuations, possibly due to the low ratio of carbon to nitrogen in its stage two biovermifilter. Finally, four operating tower bio-vermifilter systems in three basins of China were evaluated and compared with two other rural sewage treatment technologies in terms of economic costs and pollutant removal performance. Comparison results show that the tower biovermifilter system is a versatile system that can work effectively under a variety of natural and socioeconomic conditions at a reasonable cost.

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Nitrate reduction in a simulated free-water surface wetland system

Cited by 33 publications

References 23 publications

Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Nitrogen removal from nitrate-laden wastewater by integrated vertical-flow constructed wetland systems

Study of nitrogen removal performance in pilot-scale multi-stage vermi-biofilter: operating conditions impacts and nitrogen speciation transformation

Tower bio-vermifilter system for rural wastewater treatment: bench-scale, pilot-scale, and engineering applications

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