Organics removal, nitrogen removal and N2O emission in subsurface wastewater infiltration systems amended with/without biochar and sludge

Sun, Yuchun; Qi, Shiyue; Zheng, Fanping; Huang, Linli; Pan, Jing; Jiang, Yingying; Hou, Wanyuan; Xiao, Li

doi:10.1016/j.biortech.2017.10.004

Cited by 82 publications

(36 citation statements)

References 27 publications

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“…Average COD removal rates were 90.9, 86.5, 73.9, and 68.2% for biochar-sludge amended SWIS B, which were higher than that of SWIS C without biochar-sludge under the same OSLR. Former studies demonstrated matrix amended with biochar and sludge could improve COD removal in SWISs (Sun et al, 2018;Zhou et al, 2017). Sludge has a high biomass concentration.…”

Section: Resultsmentioning

confidence: 99%

“…Conventional SWISs have good organic matter and phosphor removal performances. However, total nitrogen (TN) removal rate is merely around 50% and NH þ 4 À N removal rate is typically 60 to 80%, which remains as a main challenge for conventional SWISs (Li et al, 2011b;Sun et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, many researches have chosen biochar or sludge as external carbon sources to boost the denitrification for wastewater treatment Li et College of Life Science, Shenyang Normal University, Shenyang 110034, China. al., 2013;Sun et al, 2018;Zhou et al, 2017;. Biochar, a carbon-rich solid product of pyrolysis of agricultural biomass waste, has high porosity, large surface area, and cation exchange capacity.…”

Section: Introductionmentioning

confidence: 99%

“…Biochar, a carbon-rich solid product of pyrolysis of agricultural biomass waste, has high porosity, large surface area, and cation exchange capacity. It is increasingly being recognized as a multifunctional material for environmental applications, such as removal of organic and inorganic contaminants from wastewater and polluted soils (Sun et al, 2018;Xu et al, 2014;Zhou et al, 2017). Furthermore, the addition of biochar to wastewater treatment could reduce CO 2 , CH 4 , and N 2 O emissions (Zhou et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…Kadam et al (2008) and Jiang et al (2017) have demonstrated sludge would produce high biomass concentration, which significantly enhanced organic matter and nitrogen removal. Sun et al (2018) showed that adding biochar and sludge into SWISs was an effective measure for reducing N 2 O emission and improving pollutants removal.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhao

Wang

et al. 2018

Water Environment Research

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Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Shahraki

Mao

2022

J of Env Quality

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Although conventional on‐site wastewater treatment systems (OWTSs) provide only primary treatment of domestic wastewater, removal of a limited level of nutrients (N, P), pathogens, and pharmaceuticals and personal care products (PPCPs) could be achieved by such a treatment process. Biochar has the capacity to remove various contaminants and has been widely used as an ideal soil amendment in agriculture due to its persistence, superior nutrient‐retention properties, low cost, and ready availability. However, few applications on the use of biochar in onsite wastewater treatment have been explored. In this review, we systematically reviewed the applications of biochar in filtration‐based OWTSs for nutrient (N, P) removal and recovery as well as pathogen and PPCP removal. Although adsorption was the main mechanism for P, pathogen, and PPCP removal, biochar can also serve as the growth media for enhanced biological degradation, improves available alkalinity, and increases water holding capacity in the OWTSs. The biochar source, surface modification methods, and preparation procedures (e.g., pyrolysis temperature change) have significant effects on contaminant removal performance in biochar‐amended OWTSs. Specifically, contradictory results have been reported on the effect of pyrolysis temperature change on biochar removal performance (i.e., increased, decreased, or no change) of N, P, and PPCPs. Wastewater composition and environmental pH also play important roles in the removal of nutrients, pathogens, and PPCPs. Overall, biochar holds great potential to serve as an alternative filtration material or to be amended to the current OWTS to improve system performance in removing a variety of contaminants at low cost.

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Nitrogen removal mechanisms in biochar‐amended sand filters treating onsite wastewater

et al. 2023

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The performance of biochar‐amended sand filters treating septic tank effluent (STE) was investigated in bench‐scale columns. Softwood biochar showed higher NH4+–N adsorption capacity (1.3 mg N g−1), and its water holding capacity (0.57 g ml−1) was significantly higher than sand (0.26 g ml−1). Two biochar amendment ratios (10% and 30%) were selected for STE treatment in short‐term (20 days) and long‐term (8 months) studies. During the short‐term experiment, the overall total nitrogen removal efficiency was greater in biochar‐amended sand columns (94.7%–95.6%) than in 100% sand columns (71.2%) due to the additional NH4+–N adsorption by biochar. Greater nitrification performance was also observed in biochar‐amended columns (87.1%–96.3%) than in 100% sand columns (61.4%) during long‐term operation when alkalinity was insufficient. The nitrification performance in biochar‐amended columns resumed more quickly (<7 days) after sufficient alkalinity was amended. The density of total biomass and nitrifying bacteria in biochar‐amended columns (30%) were significantly higher at all experimental stages, suggesting biochar served as a growth media for enhanced biomass growth. The alkalinity changes and STE composition fluctuation had little impact on the nitrification performance of the 30% biochar‐amended sand columns. In addition, biochar surface functional groups and zeta potential changed little after long‐term STE filtration. Collectively, the results demonstrated proper biochar amendment ratio (30%) could enhance the nitrification performance of sand filters treating STE by increasing the system hydraulic retention time, providing additional alkalinity for nitrification, and serving as a growth media for enhanced biomass growth.

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Organics removal, nitrogen removal and N2O emission in subsurface wastewater infiltration systems amended with/without biochar and sludge

Cited by 82 publications

References 27 publications

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

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

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Nitrogen removal mechanisms in biochar‐amended sand filters treating onsite wastewater

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Organics removal, nitrogen removal and N2O emission in subsurface wastewater infiltration systems amended with/without biochar and sludge

Cited by 82 publications

References 27 publications

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

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

Biochar application in biofiltration systems to remove nutrients, pathogens, and pharmaceutical and personal care products from wastewater

Nitrogen removal mechanisms in biochar‐amended sand filters treating onsite wastewater

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Product

Resources

About

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

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