Thiosulfate as external electron donor accelerating denitrification at low temperature condition in S0–based autotrophic denitrification biofilter

Zhang, Xuening; Zhu, Lin; Li, Zhuoran; Sun, Yaru; Qian, Zhi-Min; Li, Shuangyan; Cheng, Hao-Yi; Wang, Aijie

doi:10.1016/j.envres.2022.113009

Cited by 29 publications

(7 citation statements)

References 35 publications

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“…With an average influent nitrate concentration of 14.4 mg-N/L, a stable effluent nitrate below 8.0 mg-N/L, which is 20% lower than the local standard (DB 13/2795, 10.0 mg-N/L of TN), could be achieved by operating only a single subunit with an EBCT of 0.5 h and a nitrate loading of 0.69 kg-N/m 3 /d. The performance was slightly lower than that of lab-scale S 2 PBs but remained compared to findings from previous pilot-scale studies, as compared in Table S5. ,,− To adhere to a more stringent TN standard, such as the Dian Lake standard (DB5301/T62, 5.0 mg-N/L of TN), two subunits were utilized to attain an average effluent nitrate concentration of 2.4 mg-N/L. During these two periods, no dissolved sulfide was produced.…”

Section: Resultsmentioning

confidence: 78%

“…Nitrate loading fluctuations and annual temperature variations are common in practical wastewater treatment, significantly affecting the biological redox reactions. , To investigate the combined effects of nitrate loading and temperature on the S 0 DP process, three S 2 PBs were operated with a gradual decline in nitrate loading at the temperatures of 30, 20, and 10 °C, respectively (Figure A). The results demonstrated more effective nitrate removal at higher temperatures, with maximum nitrate removals of 13.9 mg-N/L (30 °C), 7.8 mg-N/L (20 °C), and 2.9 mg-N/L (10 °C), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Given the critical nature of the annual TN standardized discharge, many biological treatment facilities in WWTPs are conservatively designed based on cold temperature growth kinetics . For S 2 PB, the initially overpacked volume of sulfur-siderite medium, designed conservatively for cold temperature, results in excessive removal of SHEAs in high-temperature conditions. , Consequently, annual temperature fluctuations in practical engineering may deplete SHEAs, further inducing the S 0 DP process (e.g., operating 3 subunits, Figure ). This study addressed the gap in understanding the S 0 DP performance by considering both temperature and nitrate loading effects, identifying varying boundary values (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…5 As a result, this approach offers significant advantages, including independence from organic carbon, lower operational costs, and zero carbon dioxide emissions, while demonstrating impressive nitrate removal capabilities. 7,8 Although the S 0 AD process is becoming increasingly accepted in the wastewater treatment industry, another S 0associated process named sulfur disproportionation (S 0 DP) has also gained significant attention. 9 S 0 DP plays a crucial role in the natural sulfur cycle, especially in marine ecosystems, and contributes to the isotopic signatures of sulfidic minerals in diverse sediments.…”

Section: ■ Introductionmentioning

confidence: 99%

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Thermodynamic Inhibition of Microbial Sulfur Disproportionation in a Multisubunit Designed Sulfur-Siderite Packed Bioreactor

Sun,

Zhu,

Zheng

et al. 2024

Environ. Sci. Technol.

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Sulfur disproportionation (S 0 DP) poses a challenge to the robust application of sulfur autotrophic denitrification due to unpredictable sulfide production, which risks the safety of downstream ecosystems. This study explored the S 0 DP occurrence boundaries with nitrate loading and temperature effects. The boundary values increased with the increase in temperature, exhibiting below 0.15 and 0.53 kg-N/m 3 /d of nitrate loading at 20 and 30 °C, respectively. A pilot-scale sulfur-siderite packed bioreactor (150 m 3 /d treatment capacity) was optimally designed with multiple subunits to dynamically distribute the loading of sulfur-heterologous electron acceptors. Operating two active and one standby subunit achieved an effective denitrification rate of 0.31 kg-N/m 3 /d at 20 °C. For the standby subunit, involving oxygen by aeration effectively transformed the facultative S 0 DP functional community from S 0 DP metabolism to aerobic respiration, but with enormous sulfur consumption resulting in ongoing sulfate production of over 3000 mg/L. Meanwhile, acidification by the sulfur oxidation process could reduce the pH to as low as 2.5, which evaluated the Gibbs free energy (ΔG) of the S 0 DP reaction to +2.56 kJ, thermodynamically suppressing the S 0 DP occurrence. Therefore, a multisubunit design along with S 0 DP inhibition strategies of short-term aeration and long-term acidification is suggested for managing S 0 DP in various practical sulfur-packed bioreactors.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermodynamic Inhibition of Microbial Sulfur Disproportionation in a Multisubunit Designed Sulfur-Siderite Packed Bioreactor

Sun,

Zhu,

Zheng

et al. 2024

Environ. Sci. Technol.

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“…Many scholars have also confirmed the significant importance of temperature to the degree of mixotrophic denitrification. Demir et al [21] conducted an autotrophic denitrification treatment experiment with actual nitrate contaminated groundwater and found a halving of denitrification efficiency when the temperature was reduced from 30℃ to 20℃; Zhang et al [22] found a logarithmic decrease in nitrate removal when the temperature was reduced from 30℃ to 10℃ in an experiment with S 0based autotrophic denitrification filters. The HRT extension contributes to increasing denitrification efficiency at low water temperatures, but it's also necessary to design and apply other operating conditions for seasonal temperature changes.…”

Section: Fa=4-1=3mentioning

confidence: 99%

Experiments on Mixotrophic Denitrification under Different Hydraulic Loads and Water Temperatures

Zhang¹,

Liu²,

Ma³

2023

IJHT

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Currently most wastewater treatment plants are faced with upgrading and reconstruction to further improve the effect of deep denitrification. To this end, this paper conducts an experimental study on deep denitrification in the sulfur mixotrophic nitrification filter process using sulfur as filler. During the experiments, when the water temperature of the mixed pool was around 15℃, the influent nitrogen load was 7.3×10-3kg/m3• d, and hydraulic retention time (HRT) was 3.5 h, the average effluent TN concentration was 4.22 mg/L and the TN removal rate reached 43.42%, stably reaching the requirements of the core control area stipulated in the Daqing River Basin Water Pollutants Discharge Standard (DB13/2795-2018); under the conditions of HRT = 3.5 h and water temperatures of 15℃, 22℃, 27℃, 35℃ and 40℃, the average TN removal rate of the mixotrophic denitrification filter reached the highest at 35℃, up to 63%; two-factor analysis of variance (ANOVA) was applied to illustrate the influence of the two factors (water temperature and HRT) on the TN removal rate, and to conclude that the influence of each factor on its TN removal rate is ranked in a descending order: B (water temperature) > A (HRT) > A × B (interaction), all of which were important conditions to be considered, and water temperature was the most influential. These results show that the sulfur mixotrophic denitrification filter has the ability to deeply degrade the TN in the secondary effluent. This study provides a theoretical basis for the sulfur mixotrophic denitrification filter to be used as a deep treatment unit. Also, in the actual application, other operating conditions should be designed and considered to adapt to the uncertain seasonal temperature changes.

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Research progress and prospect of low-carbon biological technology for nitrate removal in wastewater treatment

Zheng,

Zhang,

Kong

et al. 2024

Front. Environ. Sci. Eng.

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Wastewater treatment plants are the major energy consumers and significant sources of greenhouse gas emissions, among which biological nitrogen removal of wastewater is an important contributor to carbon emissions. However, traditional heterotrophic denitrification still has the problems of excessive residual sludge and the requirement of external carbon sources. Consequently, the development of innovative low-carbon nitrate removal technologies is necessary. This review outlines the key roles of sulfur autotrophic denitrification and hydrogen autotrophic denitrification in low-carbon wastewater treatment. The discovered nitrate/nitrite dependent anaerobic methane oxidation enables sustainable methane emission reduction and nitrogen removal by utilizing available methane in situ. Photosynthetic microorganisms exhibited a promising potential to achieve carbon-negative nitrate removal. Specifically, the algal-bacterial symbiosis system and photogranules offer effective and prospective low-carbon options for nitrogen removal. Then, the emerging nitrate removal technology of photoelectrotrophic denitrification and the underlying photoelectron transfer mechanisms are discussed. Finally, we summarize and prospect these technologies, highlighting that solar-driven biological nitrogen removal technology is a promising area for future sustainable wastewater treatment. This review has important guiding significance for the design of low-carbon wastewater treatment systems.

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Thiosulfate as external electron donor accelerating denitrification at low temperature condition in S0–based autotrophic denitrification biofilter

Cited by 29 publications

References 35 publications

Thermodynamic Inhibition of Microbial Sulfur Disproportionation in a Multisubunit Designed Sulfur-Siderite Packed Bioreactor

Thermodynamic Inhibition of Microbial Sulfur Disproportionation in a Multisubunit Designed Sulfur-Siderite Packed Bioreactor

Experiments on Mixotrophic Denitrification under Different Hydraulic Loads and Water Temperatures

Research progress and prospect of low-carbon biological technology for nitrate removal in wastewater treatment

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