Effect of carbon source on the denitrification in constructed wetlands

Lü, Sihua; Hu, Hong-Ying; Sun, Yingxue; Yang, Jia

doi:10.1016/s1001-0742(08)62379-7

Cited by 157 publications

(67 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the present experiment, mean value of COD/ NO À 3 -N in the fed wastewater was only 2.0, and a significant fraction of the organic matter would be biodegraded within the upper layer of the down-flow chamber [38,39]. Therefore, limited carbon source for denitrification and accumulations of NO À 3 -N and NO À 2 -N in the wetland beds could be expected, which was in accordance with other references [20,36,40,41].…”

Section: Insufficient Carbon Sourcesupporting

confidence: 88%

“…Biological denitrification is highly depended on temperature [1,25,31,36,43], and it was reported to slow down below 15˚C and nearly cease below 5˚C due to the drastically dropped activities of denitrifying bacteria [11]. In our experiment, the sharp decrease of NO À 3 -N removal rate observed in January ( Fig.…”

Section: Low Temperaturementioning

confidence: 46%

“…It was reported that removal efficiencies for NO À 3 -N and NO À 2 -N increased with C/N ratio [8,20,35]. A significant effect of carbon addition on the nitrate removal was informed for the treatment of nitrate-contaminated wastewater using CWs [8,36,37]. Gagnon et al [37] reported that mean nitrate removal efficiency was just 7% in HSSF CW mesocosms treating hydroponics wastewater without carbon addition, but achieved about 70% in those with sucrose addition at a COD/NO À 3 -N ratio of 3.5:1.…”

Section: Insufficient Carbon Sourcementioning

confidence: 99%

See 2 more Smart Citations

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

View full text Add to dashboard Cite

A B S T R A C TNitrate removal rates of two pilot-scale integrated vertical-flow constructed wetlands (IVCWs) treating tail water, under a hydraulic loading rate (HLR) of 250 mm/d with a mean influent NO À 3 -N concentration of 24.4 mg·L À1 , were evaluated. Mean NO À 3 -N removal efficiencies of 15.5 and 18.5% with mass removal rates of 1.01 g·m À2 ·d À1 and 1.16 g·m À2 ·d À1 for IVCW 1 (planted with Canna indica and Pontederia cordata) and 2 (planted with Typha orientalis and Arundo donax var. versicolor), respectively, were achieved. The removal rate constants as fitted by the first-order area-based model averaged 0.046 and 0.055 m·d À1 , respectively. Since NO À 3 -N was the dominant nitrogen form in the effluent, denitrification was the limiting step in nitrogen removal despite of favorable pH and anaerobic conditions in the wetland beds. Low availability of carbon source, high HLR, and low temperature could be the probable influencing factors for the observed low NO À 3 -N removal efficiencies. However, IVCW could be used to treat tail water for nitrate removal at a comparable high loading rate.

show abstract

Section: Insufficient Carbon Sourcesupporting

confidence: 88%

Section: Low Temperaturementioning

confidence: 46%

Section: Insufficient Carbon Sourcementioning

confidence: 99%

See 1 more Smart Citation

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Chang¹,

Wu²,

Dai³

et al. 2013

Desalination and Water Treatment

View full text Add to dashboard Cite

show abstract

“…This is different from the report of Im et al (2014), in which study the ammonia-oxidising bacteria played a crucial role. DO values and carbon sources were two crucial factors in denitrification (Ingersoll and Baker 1998;Lu et al 2009). The DO level of VBF inflow is satisfactory; however, the removal rate of carbon sources fails to reach the standard.…”

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

View full text Add to dashboard Cite

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)

show abstract

“…MRRs show a positive response to increasing the HLR for both the VSSF and HSSF wetland units with all pollutants, except for NO3 − -N in the VSSF unit. This negative response for NO3 − -N MRRs in the VSSF unit is believed to be a result of the enhanced nitrification and incomplete denitrification under an oxic environment and lack of a suitable carbon source [30]. The regression analysis confirmed these observations, with a strong linear correlation between MLRs and MRRs for BOD5, TSS, FC, TC, and NH4 + -N, of over 0.9 in both wetland units; a moderate correlation for NO3 − -N (R 2 = 0.743) in the HSSF wetland unit; and a weak relationship for NO3 − -N in the VSSF wetland unit (R 2 = 0.25).…”

Section: Drainage Stream Water Characteristicsmentioning

confidence: 99%

Applicability of Constructed Wetlands for Water Quality Improvement in a Tea Estate Catchment: The Pussellawa Case Study

Weerakoon

Jinadasa

Herath

et al. 2018

Water

View full text Add to dashboard Cite

Abstract:Water in agricultural catchments is prone to pollution from agricultural runoff containing nutrients and pesticides, and contamination from the human population working and residing therein. This study examined the quality of water in a drainage stream which runs through a congested network of 'line houses' (low-income housing, typically found arranged in straight 'lines' on estates) in the tea estate catchment area of Pussellawa in central Sri Lanka. The study evaluated the applicability of vertical subsurface flow (VSSF) and horizontal subsurface flow (HSSF) constructed wetlands for water polishing, as the residents use the stream water for various domestic purposes with no treatment other than possibly boiling. Water flow in the stream can vary significantly over time, and so investigations were conducted at various flow conditions to identify the hydraulic loading rate (HLR) bandwidth for wetland polishing applications. Two wetland models of 8 m × 1 m × 0.6 m (length × width × depth) were constructed and arranged as VSSF and HSSF units. Stream water was diverted to these units at HLRs of 3.3, 4, 5, 10, 20, and 40 cm/day. Results showed that both VSSF and HSSF wetland units were capable of substantially reducing five-day biochemical oxygen demand (BOD 5 ), total suspended solids (TSS), fecal coliform (FC), total coliform (TC), ammonia nitrogen (NH 4 + -N), and nitrate nitrogen (NO 3 − -N) up to 20 cm/day HLR, with removal efficiencies of more than 64%, 60%, 90%, 93%, 70%, and 59% for BOD 5 , TSS, FC, TC, NH 4 + -N, and NO 3 − -N, respectively, in the VSSF wetland unit; and more than 66%, 62%, 91%, 90%, 53%, and 77% for BOD 5 , TSS, FC, TC, NH 4 + -N, and NO 3 − -N, respectively, in the HSSF wetland unit.

show abstract

Effect of carbon source on the denitrification in constructed wetlands

Cited by 157 publications

References 35 publications

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

Nitrate removal from tail water by integrated vertical-flow constructed wetlands at a high hydraulic loading rate

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

Applicability of Constructed Wetlands for Water Quality Improvement in a Tea Estate Catchment: The Pussellawa Case Study

Contact Info

Product

Resources

About