Woodchip-sulfur based heterotrophic and autotrophic denitrification (WSHAD) process for nitrate contaminated water remediation

Li, Rui; Feng, Chuanping; Hu, Weiwu; Xi, Beidou; Zhao, Baowei; Liu, Ying; Hao, Chunbo; Pu, Jian

doi:10.1016/j.watres.2015.11.044

Cited by 126 publications

(19 citation statements)

References 39 publications

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“…In fact, corresponding to the extra 58.8 mg NO3 − -N reduction in HSHAD mesocosms, 443.6 mg SO4 2− should be produced, based on Equation (5), which was lower than the measured value of 680.2 In fact, corresponding to the extra 58.8 mg NO 3 − -N reduction in HSHAD mesocosms, 443.6 mg SO 4 2− should be produced, based on Equation (5), which was lower than the measured value of 680.2 mg. This phenomenon suggests that SO 4 2− generation did not completely obey the stoichiometric relationship due to sulfite and thiosulfate formation by some intermediate reaction processes [31,62]. Concentrations of NH 4 + -N, NO 2 − -N and TP during different phases were also analyzed.…”

Section: Dom Analysismentioning

confidence: 99%

“…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. However, it was only operated in serum bottles for less than two weeks with limited experimental data.…”

Section: Introductionmentioning

confidence: 99%

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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: Dom Analysismentioning

confidence: 99%

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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“…These observations can explain the difference between the fitted kinetic models at different nitrate concentrations (Schipper et al 2010) and the decreased nitrate removal rate. However, the kinetic rate constant at NO 3 − -N concentration of 5 mg L −1 (2.09 days −1 ) was still higher than that (0.95 day −1 ) obtained in the PAD process (Li et al 2016c). Thus, it showed a remarkable advantage of POMD system that more nitrate could be reduced from the same secondary effluent without external carbon source in a favorable denitrification rate compared with single heterotrophic or pyrite-based autotrophic denitrification system.…”

Section: Effect Of Nitrate Concentrationmentioning

confidence: 57%

“…The nutrient medium was replaced every week until the nitrate removal efficiency was stable in a cycle. Before the inoculation, the seed sludge was washed thrice with physiological saline to remove the residual nitrate and sulfate (Li et al 2016c), and then stood overnight.…”

Section: Pyrite Preparation and Characterizationmentioning

confidence: 99%

“…Considering the explosive nature of hydrogen, autotrophic denitrification using elemental sulfur or sulfide as electron donors is more feasible and cost-effective (Sahinkaya and Dursun 2012). Although sulfur-based autotrophic denitrification has been extensively reported (Hashimoto et al 1987;Huang et al 2019;Moon et al 2004;Sun and Nemati 2012;Zhou et al 2016), large amounts of alkalinity consumption and sulfate production have limited its practical application (Di Capua et al 2019;Li et al 2016c;Sahinkaya and Dursun 2012). Pyrite, an abundant sulfide mineral in the Earth's crust (Chandra and Gerson 2010;Ogbughalu et al 2020), which is insoluble and stable in anoxic conditions, may serve as an ideal electron donor due to its low procurement cost and potential of P removal.…”

Section: Introductionmentioning

confidence: 99%

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Performance and mechanism of synchronous nitrate and phosphorus removal in constructed pyrite-based mixotrophic denitrification system from secondary effluent

Zhang

Huang

2020

Environ Sci Pollut Res

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The performance and process of the constructed pyrite-based mixotrophic denitrification (POMD) system using pyrite and residual organic matters as the co-electron donors were investigated for simultaneous removal of N and P from secondary effluent. After the batch experiments, 61.80 ± 3.26% of phosphate and 99.99 ± 0.01% of nitrate were removed, and the obtained nitrate removal rate constant can reach 2.09 days −1 in POMD system, which was significantly superior to that reported (0.95 day −1 ) in pyrite-based autotrophic denitrification (PAD) system. PO 4 3− -P removal was mainly achieved via chemical precipitation as FePO 4 with iron, and it was irrelevant with the initial nitrate and ammonium concentrations. High-throughput 16S rRNA gene sequencing analysis showed the coexistence of heterotrophic and autotrophic denitrifiers in the mixotrophic environment. The denitrification process could be divided into two stages according to the carbon balance and calculation of sulfate accumulation: (a) nitrate was mainly reduced heterotrophically during 12-36 h and (b) nitrate was reduced autotrophically after 36 h. The calculated proportion of heterotrophic denitrification was 58.17 ± 3.78%, which was promoted by a higher ammonium concentration. These findings are likely to be useful in understanding the mixotrophic denitrification process and developing a cost-effective technology to simultaneously remove N and P from secondary effluent.

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Mathematical Modeling of Reactor for Water Remediation

Bagheri¹,

Mohebbi²,

Mirzaie³

et al. 2021

Applied Water Science

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Woodchip-sulfur based heterotrophic and autotrophic denitrification (WSHAD) process for nitrate contaminated water remediation

Cited by 126 publications

References 39 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

Performance and mechanism of synchronous nitrate and phosphorus removal in constructed pyrite-based mixotrophic denitrification system from secondary effluent

Mathematical Modeling of Reactor for Water Remediation

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