Enhanced nitrogen removal of low C/N wastewater in constructed wetlands with co-immobilizing solid carbon source and denitrifying bacteria

Yu, Guanlong; Peng, Haiyuan; Fu, Yongjiang; Yan, Xiaojiang; Du, Chunyan; Hong, Chen

doi:10.1016/j.biortech.2019.02.043

Cited by 106 publications

(29 citation statements)

References 32 publications

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“…It indicates that an excessive amount of nitrogen would be discharged to the natural waters if additional treatment has not been applied after secondary treatment. In the last decades, excessive nitrogen discharge from the wastewater treatment plant has caused severe eutrophication and destructed the aquatic ecosystems (Yu et al, 2019). Different from other pretreatments, TN concentration in the supernatant was nearly not changed (from 40.50 mg/L to 45.00 mg/L) after acidic pretreatment (Fig.…”

Section: Resultsmentioning

confidence: 92%

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Chen

Zhang

et al. 2020

Preprint

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Background: Converting wastewater sludge to lipid is considered as one of the best strategies of sludge management. The current problem of lipid production from wastewater sludge is the low yield (0.10-0.16 g lipid/g dry sludge) due to the low availability of easily uptaken materials (such as soluble monosaccharide and oligosaccharide) in sludge to oleaginous microorganism (Rhodotorula glutinis, Trichosporon oleaginosus, Lipomyces starkeyi). Pretreatments are efficient methods to improve sludge bioavailability. This study is aimed to achieve high lipid production from sludge and high sludge reduction. Results: In this study, it was observed that the soluble chemical oxygen demand (SCOD) had significantly increased after different pretreatment. The SCOD in the supernatant was increased from 32.64 to 180.25 mg/L, 924.16 mg/L, 1029.89mg/L and 3708.31 mg/L after acidic (pH 2 for 2 h), alkaline (pH 12 for 2 h), microwave irradiation (15 min with 5 min interval), and ultrasonication (30 min at 450 W and 20 kHz frequency with 5 s on and 2 s off mode) pretreatment, respectively. Pretreatments have also increased the release of total nitrogen (TN) and total phosphorus (TP) from solids. The sludge after different pretreatments were used as medium for lipid production, and the highest lipid content (36.67% g/g) was obtained in the fermentation with ultrasonication pretreatment sludge, and the sludge reduction was 63.10%. For other pretreatments, the lipid content and sludge reduction were 18.42% and 32.63% in acid pretreatment case, 21.08% and 36.44% in alkaline pretreatment case, and 26.31% and 43.03% in microwave pretreatment case, respectively.Conclusion: It was found that ultrasonication pretreatment was the most efficient way to increase the sludge biodegradability (SCOD) and to release TN and TP from solid phase to liquid phase. Pretreated sludge for lipid production achieved significant improvement in lipid yield and sludge reduction. Lipids produced from pretreated sludge were transesterified to biodiesel and the analysis showed that the biodiesel had a similar composition as commercial biodiesel. The study reveals that pretreatment on sludge is a promising method for enhancing biological sludge management efficiency.

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Section: Resultsmentioning

confidence: 92%

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Chen

Zhang

et al. 2020

Preprint

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“…It indicates that the nitrogen concentration in the e uent of secondary sedimentation was high and an excessive amount of nitrogen would be discharged to the natural waters if addition treatment has not been applied after secondary treatment. In the last decades, excessive nitrogen discharging from the wastewater treatment plant has caused severe eutrophication and destructed the aquatic ecosystems (Yu et al, 2019). Different from other pretreatments, TN concentration in the supernatant was nearly not changed (from 40.5 mg/L to 45 mg/L) after acidic pretreatment (Fig.…”

Section: Resultsmentioning

confidence: 92%

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Chen

Zhang

et al. 2020

Preprint

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Background: Converting wastewater sludge for lipid is considered as one of the best strategies of sludge management. The current problem of lipid production from sludge is the low yield due to the low availability of easily uptaken materials in sludge. Pretreatments are efficient methods to improve sludge bioavailability. Results: In this study, it was observed that the soluable chemical oxygen demand (SCOD) had significantly increased after different pretreatment.The SCOD in the supernatant was increased from 32.64±5.19 to 180±13 mg/L, 924±17 mg/L, 1030±6 mg/L and 3708±22 mg/L after acidic, alkaline, microwave irradiation and ultrasonication pretreatment, respectively. Pretreatments have also increased the release in total nitrogen (TN) and total phosphorus (TP) from solids. The sludge after different pretreatments were used as medium for lipid production, thighest lipid content (36.67% g/g) was obtained in the fermentation with ultrasonication pretreatment sludge, and the sludge reduction was 63.10%.Conclusion: It was found that ultrasonication pretreatment was the most efficient way to increase the sludge biodegradability (SCOD), to release TN and TP from solid phase to liquid phase. Pretreated sludge for lipid production achieved significant improvement lipid yield and sludge reduction. Lipids produced from pretreated sludge was transesterified to biodiesel and the analysis showed that the biodiesel had similar composition as commercial biodiesel. The study reveals that pretreatment on sludge is a promising method for enhancing biological sludge management efficiency.

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“…Comparison of performance between C/N = 4 and C/N = 2 at 1000 Ω The unique advantage and limitation of Cupriavidus sp. S1 are effective nitrogen removal at high C/N ratios (12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25)(26)(27)(28) and the substantial restriction of denitrification at low C/N ratios (≤ 4), respectively. Therefore, the low C/N ratio in the cathode chamber at first was controlled at two values (4 and 2) at the R ext of 1000 Ω. Nitrogen in the synthetic wastewater was in the form of NO − 3 -N at the beginning of each cycle.…”

Section: Resultsmentioning

confidence: 99%

“…However, the application was restricted because of huge purchasing costs, additional resource consumption and complex operation. Also, the amount of addition was ambiguous, which could cause in‐complete or overdosing of the denitrification, which had a great influence on nitrogen and organic removal . Therefore, it is of great significance for HNADB to seek economical and effective treatment technology for low C/N wastewater.…”

Section: Introductionmentioning

confidence: 99%

Enhanced nitrogen removal of low C/N wastewater using a novel microbial fuel cell (MFC) with Cupriavidus sp. S1 as a biocathode catalyst (BCS1)

Liu

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND An innovative microbial fuel cell (MFC) using Cupriavidus sp. S1 as the biocathode catalyst was developed to improve nitrogen removal from low carbon/nitrogen (C/N) wastewater. RESULTS The desirable external resistance was 100 Ω in this study, with an optimal total nitrogen (TN) removal efficiency of 95.71%, and a maximum current density and power density of 7583.89 ± 318.11 mA m−3 and 932 mW m−3 at C/N = 2, respectively, which initially confirmed the ability of Cupriavidus sp. S1 to obtain electrons from the electrode. The maximum tolerance of the system at Rext of 100 Ω was C/N = 1, with a TN removal efficiency of 90.87%. Compared with the open circuit, the TN removal increased by approximately 21.60% and 52.02% at C/N = 2 and 1, respectively, which expanded the application area for the dominant denitrifying bacteria S1. Additionally, the system exhibits the obvious merits of less sludge production, low energy consumption and the recovery of some energy. CONCLUSION Based on these results, domesticated Cupriavidus sp. S1 possesses electrochemical activity. Thus, the system has great potential for efficient and cost‐effective nitrogen removal from nitrate‐containing low C/N wastewater and energy recovery. © 2019 Society of Chemical Industry

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Enhanced nitrogen removal of low C/N wastewater in constructed wetlands with co-immobilizing solid carbon source and denitrifying bacteria

Cited by 106 publications

References 32 publications

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Pretreatments for enhancing sewage sludge reduction and reuse in lipid production

Pretreatments for Enhancing Sewage Sludge Reduction and Reuse in Lipid Production

Enhanced nitrogen removal of low C/N wastewater using a novel microbial fuel cell (MFC) with Cupriavidus sp. S1 as a biocathode catalyst (BCS1)

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