Remediation of nitrate–nitrogen contaminated groundwater using a pilot-scale two-layer heterotrophic–autotrophic denitrification permeable reactive barrier with spongy iron/pine bark

Huang, Guoxin; Yi, Huang; Hu, Hai; Liu, Fei; Zhang, Ying; Deng, Renwei

doi:10.1016/j.chemosphere.2015.02.029

Cited by 54 publications

(17 citation statements)

References 44 publications

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“…Previous studies have obtained favorable denitrification performance by applying combined heterotrophic and autotrophic denitrification (HAD) process in the treatment of drinking water [17][18][19], hydroponic wastewater [20], groundwater [21,22], simulated wastewater [23][24][25][26][27][28][29][30][31], etc. A woodchip-sulfur combined mixotrophic process was recently developed to eliminate nitrate from groundwater [31], whose denitrification performance was better than that of the sulfur-based autotrophic denitrification systems.…”

Section: Introductionmentioning

confidence: 99%

Hydrilla verticillata–Sulfur-Based Heterotrophic and Autotrophic Denitrification Process for Nitrate-Rich Agricultural Runoff Treatment

Hang

Wang

et al. 2020

IJERPH

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Hydrilla verticillata-sulfur-based heterotrophic and autotrophic denitrification (HSHAD) process was developed in free water surface constructed wetland mesocosms for the treatment of nitrate-rich agricultural runoff with low chemical oxygen demand/total nitrogen (C/N) ratio, whose feasibility and mechanism were extensively studied and compared with those of H. verticillata heterotrophic denitrification (HHD) mesocosms through a 273-day operation. The results showed that the heterotrophic and autotrophic denitrification can be combined successfully in HSHAD mesocosms, and achieve satisfactory nitrate removal performance. The average NO 3 − -N removal efficiency and denitrification rate of HSHAD were 94.4% and 1.3 g NO 3 − -N m −3 ·d −1 in steady phase II (7-118 d). Most nitrate was reduced by heterotrophic denitrification with sufficient organic carbon in phase I (0-6 d) and II, i.e., the C/N ratio exceeded 4.0, and no significant difference of nitrate removal capacity was observed between HSHAD and HHD mesocosms. During phase III (119-273 d), sulfur autotrophic denitrification gradually dominated the HSHAD process with the C/N ratio less than 4.0, and HSHAD mesocosms obtained higher NO 3 − -N removal efficiency and denitrification rate (79.1% and 1.1 g NO 3 − -N m −3 ·d −1 ) than HHD mesocosms (65.3% and 1.0 g NO 3 − -N m −3 ·d −1 ). As a whole, HSHAD mesocosms removed 58.8 mg NO 3 − -N more than HHD mesocosms. pH fluctuated between 6.9-9.0 without any pH buffer. In general, HSHAD mesocosms were more stable and efficient than HHD mesocosms for NO 3 − -N removal from agricultural runoff during long-term operation.The denitrificans containing narG (1.67 × 10 8 ± 1.28 × 10 7 copies g −1 mixture-soil −1 ), nirS (8.25 × 10 7 ± 8.95 × 10 6 copies g −1 mixture-soil −1 ), and nosZ (1.56 × 10 6 ± 1.60 × 10 5 copies g −1 mixture-soil −1 ) of litter bags and bottoms in HSHAD were higher than those in HHD, which indicated that the combined heterotrophic and autotrophic denitrification can increase the abundance of denitrificans containing narG, nirS, and nosZ, thus leading to better denitrification performance.

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Section: Introductionmentioning

confidence: 99%

Hydrilla verticillata–Sulfur-Based Heterotrophic and Autotrophic Denitrification Process for Nitrate-Rich Agricultural Runoff Treatment

Hang

Wang

et al. 2020

IJERPH

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“…To solve these problems, many researchers have turned the spotlight on the in situ production of hydrogen by anaerobic corrosion of metallic iron. 17,25,[27][28][29] Among various forms of metallic iron, nanoscale iron has received much attention because nanoscale zero-valent iron has a fast removal efficiency due to its large specic surface area. [30][31][32] However, the relatively expensive cost hinders the large-scale application.…”

Section: Introductionmentioning

confidence: 99%

Bacteria-supported iron scraps for the removal of nitrate from low carbon-to-nitrogen ratio wastewater

Liu

Huang

et al. 2019

RSC Adv.

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“…Inorganic nitrogen compounds, such as nitrite, nitrate, and ammonium, are abundant contaminants in ground and surface water. High NO 3 -N concentrations (>10 mg/L) have been recorded in numerous aquifers in many countries (1). Nitrate that is used mainly in inorganic fertilizers leaks into the aquifer and surface waters (2,3).…”

Section: Introductionmentioning

confidence: 99%

“…In livestock, nitrate contamination can cause reduced weight gain rates. Among different physical, chemical, and biological nitrate removal processes, biological denitrification is an efficient microbial process that changes nitrate to N 2 under anoxic conditions (1,10,11). In this process, four enzymatic steps produce intermediates such as nitrite (NO 2 -), nitric oxide (NO), and nitrous oxide (N 2 O) (12).…”

Section: Introductionmentioning

confidence: 99%

Autotrophic denitrification of synthetic nitrate-contaminated groundwater in up-flow fixed-bed bioreactor by pumice as porous media

Tourang

Aminzadeh

Torabian

2018

Environ Health Eng Manag

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Background: Background: Increasing nitrate concentrations in groundwater resources is considered a common environmental and public health problem worldwide. In this research, an autotrophic up-flow bioreactor with pumice as media was used to study the effects of the sulfur-to-nitrogen (S/N) ratio and empty bed contact time (EBCT) on nitrate removal efficiency and byproducts. Methods: Experiments were carried out in a 3.47 L up-flow, fixed-bed reactor with 3 sampling ports. To evaluate the overall impact of S/N ratio and EBCT on the performance of the bioreactor, several phases with different S/N ratios and EBCTs were applied. Results: At a constant S/N ratio of 3.85 g/g, as EBCT decreased from 24 hours to 2 hours, the nitrate removal efficiency decreased from 98% to 64%. On the other hand, at the desired EBCT of 4 hr, as S/N ratio decreased from 3.85 to 1.51 g/g, nitrate removal efficiency was reduced from 85% to 32%. Changing the EBCT and S/N ratio also affected the effluent nitrite and sulfate concentrations as byproducts. At the S/N ratio of 3.85 g/g and EBCT of 24 hours, effluent nitrite and sulfate concentrations were 0.1 mg NO 2-N/L and 463 mg SO 4 2-/L, respectively. Decreasing the S/N ratio to 1.51 g/g and the EBCT to 4 hours caused drastic changes in effluent nitrite and sulfate concentrations. Conclusion: The results indicated that the autotrophic denitrification with thiosulfate as electron donor and pumice as media was feasible and applicable for nitrate contaminated groundwater.

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Remediation of nitrate–nitrogen contaminated groundwater using a pilot-scale two-layer heterotrophic–autotrophic denitrification permeable reactive barrier with spongy iron/pine bark

Cited by 54 publications

References 44 publications

Hydrilla verticillata–Sulfur-Based Heterotrophic and Autotrophic Denitrification Process for Nitrate-Rich Agricultural Runoff Treatment

Hydrilla verticillata–Sulfur-Based Heterotrophic and Autotrophic Denitrification Process for Nitrate-Rich Agricultural Runoff Treatment

Bacteria-supported iron scraps for the removal of nitrate from low carbon-to-nitrogen ratio wastewater

Autotrophic denitrification of synthetic nitrate-contaminated groundwater in up-flow fixed-bed bioreactor by pumice as porous media

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