Treatment of anaerobic digested effluent in biochar-packed vertical flow constructed wetland columns: Role of media and tidal operation

Kizito, Simon; Lv, Tao; Wu, Shubiao; Ajmal, Zeeshan; Luo, Hongzhen; Dong, Renjie

doi:10.1016/j.scitotenv.2017.03.125

Cited by 183 publications

(53 citation statements)

References 37 publications

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“…The results showed that nitrogen removal was higher in the CW with biochar media. Kizito et al (2017) compared the nitrogen removal efficiency in vertical flow (VF) columns loaded with anaerobic digested effluent. They reported that columns packed with biochar media (from corn cob and wood biochar) performed significantly better than those packed with gravel media.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, biochar may be a suitable amendment to enhance nitrogen removal in CWs. However, the findings reported in the literature are mainly based on laboratory scale experiments under laboratory controlled conditions and in many cases used synthetic wastewater (Kizito et al, 2017;Sarkhot et al, 2012;Yao et al, 2012;Gupta et al, 2015;Zhou et al, 2017). Our study investigated the nitrogen removal efficiency in vertical flow mesocosms using sand media augmented with biochar planted with two plant species (Melaleuca quinquenervia and Cymbopogon citratus) under field environmental conditions and using domestic wastewater from both secondary clarified wastewater (SCW) and septage.…”

Section: Introductionmentioning

confidence: 99%

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Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Rozari

Greenway

Hanandeh

2018

Ecological Engineering

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Biochar has been identified as a media amendment to improve nutrient removal from wastewater, and N retention and plant growth in agroforestry. It therefore has the potential for treating domestic wastewater. The aim of this research was to compare nitrogen removal and plant growth in pure sand and sand amended with biochar, in wetland mesocosms (240 L) receiving sewage. There were seven media treatments based on the proportions of biochar in the sand media (100% sand, sand and coir peat, 5, 10, 15, 20, 25% biochar). The plant species were Paperback tree (Melaleuca quinquenervia) and Lemongrass (Cymbopogon citratus). The mesocosms were continuously loaded for 8 months with secondary clarified wastewater (SCW) (16 L/day). Septage was then intermittently loaded (20 L/2 days) for a further 8 months. Inflow and outflow samples were monitored for TN, NH 4-N, and NO x-N. All treatments showed good nitrogen removal efficiency. Average removal efficiencies of TN, NO x-N and NH 4-N in the mesocosms loaded with SCW ranged from 71 to 87%, 81 to 93% and 65 to 79%, for 100% Sand to 25% Biochar respectively. For septage, the removal efficiencies ranged from 63 to 81%, 69 to 87% and 66 to 81%, for 100% Sand to 25% Biochar respectively. Significant differences of nitrogen outflow concentrations were observed between pure sand and sand amended with biochar. Physical chemical properties of the biochar would have facilitated microbial processes and adsorption. Strong positive correlations were observed between biochar content in the media and nitrogen removal rates. The increased nitrogen removal may be attributed to higher mineralisation of organic nitrogen and NH 4-N, especially in the case of septage where strong correlation was observed between BOD 5 and TN removal. Total N biomass in the plants harvested after 21 months ranged from 13.4-14.0 g N. The addition of biochar did not increase plant N biomass in either species.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Rozari

Greenway

Hanandeh

2018

Ecological Engineering

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“…Biochar provides enough space for microbial growth and reproduction (Sun et al, 2018). Organic molecules can be easily adsorbed via electrostatic attraction and intermolecular hydrogen bonding with p-p bones on biochar surface, which resulted in high COD removal (Kizito et al, 2017). Thus, the addition of biochar-sludge could enhance COD removal for SWISs.…”

Section: Resultsmentioning

confidence: 99%

Nitrogen Removal and N₂O Emission in Biochar‐Sludge Subsurface Wastewater Infiltration Systems

Zhao

Wang

et al. 2018

Water Environment Research

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Nitrogen removal and N2O emission of biochar-sludge amended subsurface wastewater infiltration systems (SWISs) with/without intermittent aeration under different organic surface loading rates (OSLRs) were investigated. Under OSLR, between 8.5 and 54.6 g COD/(m2 d), average chemical oxygen demand (COD), , and total nitrogen (TN) removal rates decreased with OSLR increasing in non-aerated SWISs amended with/without biochar-sludge; increasing OSLR hardly affected COD and removal in biochar-sludge amended SWIS with intermittent aeration; N2O emission rate decreased with influent OSLR increasing in the SWISs. Biochar-sludge amended SWIS with intermittent aeration obtained higher removal rates for COD (94.9 to 95.5%), (90.5 to 93.7%), TN (86.5 to 89.9%) and lower N2O emission rates [13.4 to 14.7 mg/(m2 d)] under high influent OSLR of 36.2 and 54.6 g COD/(m2 d) were compared with non-aerated SWISs with/without biochar-sludge. Furthermore, the abundances of amoA, nxrA, napA, narG, nirS, nirK, qnorB, and nosZ genes involved in nitrogen removal were enhanced under high influent OSLR in biochar-sludge amended SWIS with intermittent aeration.

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“…The tidal flow has a positive effect and refreshes the wetland with fresh air and enhances the dissolved oxygen (DO) in the system. Such intermittent aeration is more effective than continuous aeration, as it facilitates the establishment of aerobic and anaerobic conditions suitable for nitrification and denitrification [34,35]. The different nutrients in these four kinds of water treatment methods behaved differently.…”

Section: Discussionmentioning

confidence: 99%

Using a Backpropagation Artificial Neural Network to Predict Nutrient Removal in Tidal Flow Constructed Wetlands

Zhang

Cai

et al. 2018

Water

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Nutrient removal in tidal flow constructed wetlands (TF-CW) is a complex series of nonlinear multi-parameter interactions. We simulated three tidal flow systems and a continuous vertical flow system filled with synthetic wastewater and compared the influent and effluent concentrations to examine (1) nutrient removal in artificial TF-CWs, and (2) the ability of a backpropagation (BP) artificial neural network to predict nutrient removal. The nutrient removal rates were higher under tidal flow when the idle/reaction time was two, and reached 90 ± 3%, 99 ± 1%, and 58 ± 13% for total nitrogen (TN), ammonium nitrogen (NH 4 + -N), and total phosphorus (TP), respectively. The main influences on nutrient removal for each scenario were identified by redundancy analysis and were input into the model to train and verify the pollutant effluent concentrations. Comparison of the actual and model-predicted effluent concentrations showed that the model predictions were good. The predicted and actual values were correlated and the margin of error was small. The BP neural network fitted best to TP, with an R 2 of 0.90. The R 2 values of TN, NH 4 + -N, and nitrate nitrogen (NO 3 − -N) were 0.67, 0.73, and 0.69, respectively.

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Treatment of anaerobic digested effluent in biochar-packed vertical flow constructed wetland columns: Role of media and tidal operation

Cited by 183 publications

References 37 publications

Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Nitrogen Removal and N₂O Emission in Biochar‐Sludge Subsurface Wastewater Infiltration Systems

Using a Backpropagation Artificial Neural Network to Predict Nutrient Removal in Tidal Flow Constructed Wetlands

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Treatment of anaerobic digested effluent in biochar-packed vertical flow constructed wetland columns: Role of media and tidal operation

Cited by 183 publications

References 37 publications

Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Nitrogen removal from sewage and septage in constructed wetland mesocosms using sand media amended with biochar

Nitrogen Removal and N2O Emission in Biochar‐Sludge Subsurface Wastewater Infiltration Systems

Using a Backpropagation Artificial Neural Network to Predict Nutrient Removal in Tidal Flow Constructed Wetlands

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Nitrogen Removal and N₂O Emission in Biochar‐Sludge Subsurface Wastewater Infiltration Systems