Effect of nickel on the comparative performance of inverse fluidized bed and continuously stirred tank reactors for biogenic sulphur-driven autotrophic denitrification

Namburath, Maneesh; Papirio, Stefano; Moscariello, Carlo; Costanzo, Nicola Di; Pirozzi, Francesco; Alappat, Babu J.; Sreekrishnan, T.R.

doi:10.1016/j.jenvman.2020.111301

Cited by 8 publications

(1 citation statement)

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“…The batch denitrification experiments were conducted in 100 mL serum bottles with a medium volume of 50 mL. The test medium composition was as follows: NH 4 Cl 400, KH 2 PO 4 300, K 2 HPO 4 800, MgCl 2 ·6H 2 O 21, NaHCO 3 365 mg·L –1 , and trace element solution 2 mL/L . First, S 0 (bio-S 0 or chem-S 0 ) and NO 3 – (NaNO 3 ) were added into the test medium as electron donors and electron acceptors of S 0 -based autotrophic denitrification, respectively.…”

Section: Methodsmentioning

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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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: Methodsmentioning

confidence: 99%