Elemental sulfur-driven autotrophic denitrification for advanced nitrogen removal from mature landfill leachate after PN/A pretreatment

Zeng, Can-Guang; Su, Qingxian; Peng, Limin; Sun, Lianpeng; Zhao, Qing; Diao, Xingxing; Lü, Hui

doi:10.1016/j.cej.2020.128256

Cited by 44 publications

(8 citation statements)

References 75 publications

(101 reference statements)

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“…In this regard, membrane bioreactors were recommended to be integrated with bio-S 0 -based technology to achieve good performance with efficient substrate retention. , On the other hand, chem-S 0 also has a place in application based on its unique properties. For instance, being nearly insoluble and hydrophobic with larger particle size (mm), chem-S 0 could be effectively used as a biomass carrier in biofilm bioreactors, such as packed bed columns and fluidized beds. , To sum up, bio-S 0 and chem-S 0 should be regarded as good complements to each other and could play important roles in different scenarios. Future research could focus on these aspects to develop more efficient S 0 -based biological technologies for environmental protection.…”

Section: Resultsmentioning

confidence: 99%

“…7 Currently, the S 0 supplied for biological processes is mainly produced by chemical reactions (chem-S 0 ). 8,9 Due to the hydrophobicity and low aqueous solubility (0.16 μM in pure water at 25 °C) of chem-S 0 , low particle dispersibility and poor sulfur mass transfer become its main drawbacks and limit the engineering application of chem-S 0 . 1,10 Biogenic sulfur (bio-S 0 ) refers to the S 0 produced by microbial metabolism, which is often observed in the biological desulfurization of H 2 S-rich biogas, natural gas, and sulfidecontaining wastewater.…”

Section: Introductionmentioning

confidence: 99%

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Insights into the Superior Bioavailability of Biogenic Sulfur from the View of Its Unique Properties: The Key Role of Trace Organic Substances

Zhu

Pan

et al. 2023

Environ. Sci. Technol.

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Elemental sulfur (S0) is widely utilized in environmental pollution control, while its low bioavailability has become a bottleneck for S0-based biotechnologies. Biogenic sulfur (bio-S0) has been demonstrated to have superior bioavailability, while little is known about its mechanisms thus far. This study investigated the bioavailability and relevant properties of bio-S0 based on the denitrifying activity of Thiobacillus denitrificans with chemical sulfur (chem-S0) as the control. It was found that the conversion rate and removal efficiency of nitrate in the bio-S0 system were 2.23 and 2.04 times those of the chem-S0 system. Bio-S0 was not pure orthorhombic sulfur [S: 96.88 ± 0.25% (w/w)]. Trace organic substances detected on the bio-S0 surface were revealed to contribute to its hydrophilicity, resulting in better dispersibility in the aqueous liquid. In addition, the adhesion force of T. denitrificans on bio-S0 was 1.54 times that of chem-S0, endowing a higher bacterial adhesion efficiency on the sulfur particle. The weaker intermolecular binding force due to the low crystallinity of bio-S0 led to enhanced cellular uptake by attached bacteria. The mechanisms for the superior bioavailability of bio-S0 were further proposed. This study provides a comprehensive view of the superior bioavailability of bio-S0 and is beneficial to developing high-quality sulfur resources.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Insights into the Superior Bioavailability of Biogenic Sulfur from the View of Its Unique Properties: The Key Role of Trace Organic Substances

Zhu

Pan

et al. 2023

Environ. Sci. Technol.

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“…These microorganisms can make use of ions in mature landfill leachate as an electron acceptor. Some researchers have verified the feasibility of these coupling processes [106][107][108][109][110]. S-anammox coupled with anammox technology has been successfully applied to treat landfill leachate in some cases, but most of them are applied in multistage [107].…”

Section: Future Perspectivementioning

confidence: 99%

Nitrogen Removal from Mature Landfill Leachate via Anammox Based Processes: A Review

et al. 2022

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Mature landfill leachate is a complex and highly polluted effluent with a large amount of ammonia nitrogen, toxic components and low biodegradability. Its COD/N and BOD5/COD ratios are low, which is not suitable for traditional nitrification and denitrification processes. Anaerobic ammonia oxidation (anammox) is an innovative biological denitrification process, relying on anammox bacteria to form stable biofilms or granules. It has been extensively used in nitrogen removal of mature landfill leachate due to its high efficiency, low cost and sludge yield. This paper reviewed recent advances of anammox based processes for mature landfill leachate treatment. The state of the art anammox process for mature landfill leachate is systematically described, mainly including partial nitrification–anammox, partial nitrification–anammox coupled denitrification. At the same time, the microbiological analysis of the process operation was given. Anaerobic ammonium oxidation (anammox) has the merit of saving the carbon source and aeration energy, while its practical application is mainly limited by an unstable influent condition, operational control and seasonal temperature variation. To improve process efficiency, it is suggested to develop some novel denitrification processes coupled with anammox to reduce the inhibition of anammox bacteria by mature landfill leachate, and to find cheap new carbon sources (methane, waste fruits) to improve the biological denitrification efficiency of the anammox system.

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“…Also, Qiu et al 17 and Oh et al 18 highlighted the possibility to add various organic compounds to a denitrifying autotrophic microbial consortium aiming to improve the process efficiency and to reduce the sulfate output without modifying the optimal working parameters. The favorable effects of organic supplementation on the performance of SdAD has not been attributed to the role of SRB but rather to the activity of HD, which considerably reduce the nitrate loading on autotrophic denitrifiers 18 , 19 . SMP represent an alternative source of organic matter which could contribute to the heterotrophic-associated process refinement of SdAD with regards to nitrate removal and sulfate reduction by minimizing the external carbon addition.…”

Section: Introductionmentioning

confidence: 99%

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

Guerriero¹,

Mattei²,

Papirio

et al. 2022

Sci Rep

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The aim of this study was to develop a mathematical model to assess the effect of soluble microbial products production and external carbon source addition on the performance of a sulfur-driven autotrophic denitrification (SdAD) process. During SdAD, the growth of autotrophic biomass (AUT) was accompanied by the proliferation of heterotrophic biomass mainly consisting of heterotrophic denitrifiers (HD) and sulfate-reducing bacteria (SRB), which are able to grow on both the SMP derived from the microbial activities and on an external carbon source. The process was supposed to occur in a sequencing batch reactor to investigate the effects of the COD injection on both heterotrophic species and to enhance the production and consumption of SMP. The mathematical model was built on mass balance considerations and consists of a system of nonlinear impulsive differential equations, which have been solved numerically. Different simulation scenarios have been investigated by varying the main operational parameters: cycle duration, day of COD injection and quantity of COD injected. For cycle durations of more than 15 days and a COD injection after the half-cycle duration, SdAD represents the prevailing process and the SRB represent the main heterotrophic family. For shorter cycle duration and COD injections earlier than the middle of the cycle, the same performance can be achieved increasing the quantity of COD added, which results in an increased activity of HD. In all the performed simulation even in the case of COD addition, AUT remain the prevailing microbial family in the reactor.

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Elemental sulfur-driven autotrophic denitrification for advanced nitrogen removal from mature landfill leachate after PN/A pretreatment

Cited by 44 publications

References 75 publications

Insights into the Superior Bioavailability of Biogenic Sulfur from the View of Its Unique Properties: The Key Role of Trace Organic Substances

Insights into the Superior Bioavailability of Biogenic Sulfur from the View of Its Unique Properties: The Key Role of Trace Organic Substances

Nitrogen Removal from Mature Landfill Leachate via Anammox Based Processes: A Review

Modelling the effect of SMP production and external carbon addition on S-driven autotrophic denitrification

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