Simultaneous reduction of perchlorate and nitrate in a combined heterotrophic-sulfur-autotrophic system: Secondary pollution control, pH balance and microbial community analysis

Wan, Dongjin; Li, Qi; Liu, Yongde; Xiao, Shuhu; Wang, Hongjie

doi:10.1016/j.watres.2019.115004

Cited by 57 publications

(14 citation statements)

References 77 publications

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“…The genera Ferritrophicum, Simplicispira, and Thermomonas were found to be dominant in the bio-samples S 1 -S 4 (Figure 5B). Ferritrophicum was reported as the denitrifying bacteria in the sulfur-based autotrophic system (Wan et al, 2019), and in this study, the abundance of Ferritrophicum increased in all the reactors. Thiobacillus, the typical denitrifying bacteria in SAD processes (Zhang et al, 2020;Dominika et al, 2021), was present at low abundances in S 1 -S 4 , and its abundance significantly increased in S 5 -S 8 .…”

Section: Comparative Analysis Of Microbial Communitysupporting

confidence: 62%

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Wang

Liang²,

Kang³

et al. 2022

Front. Microbiol.

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To avoid nitrate pollution in water bodies, two low-cost and abundant natural organic carbon sources were added to make up the solid-phase denitrification filters. This study compared four novel solid-phase carbon-sulfur-based composite filters, and their denitrification abilities were investigated in laboratory-scale bioreactors. The filter F4 (mixture of elemental sulfur powder, shell powder, and peanut hull powder with a mass ratio of 6:2.5:1.5) achieved the highest denitrification ability, with an optimal nitrate removal rate (NRR) of 723 ± 14.2 mg NO3–-N⋅L–1⋅d–1 when the hydraulic retention time (HRT) was 1 h. The HRT considerably impacted effluent quality after coupling of anaerobic ammonium oxidation (ANAMMOX) and solid-phase-based mixotrophic denitrification process (SMDP). The concentration of suspended solids (SS) of the ANAMMOX effluent may affect the performance of the coupled system. Autotrophs and heterotrophs were abundant and co-existed in all reactors; over time, the abundance of heterotrophs decreased while that of autotrophs increased. Overall, the SMDP process showed good denitrification performance and reduced the sulfate productivity in effluent compared to the sulfur-based autotrophic denitrification (SAD) process.

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Section: Comparative Analysis Of Microbial Communitysupporting

confidence: 62%

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Wang

Liang²,

Kang³

et al. 2022

Front. Microbiol.

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“…Previous studies reported that sulfide was present in SADN systems. ,, It is speculated that the biogenic sulfide could be attributed to the dissimilatory sulfate/sulfur reduction with the soluble microbial products and cell lysis products as the electron donors, , or autotrophic sulfur disproportionation (SD) mediated by sulfur-disproportionating bacteria (SDB) (eq ). This offers the possibility of a self-driven PiSADN process without the addition of sulfide chemicals and/or organics.…”

Section: Introductionmentioning

confidence: 99%

Achieving a Novel Polysulfide-Involved Sulfur-Based Autotrophic DenitrificationProcess for High-Rate Nitrogen Removal in Elemental Sulfur-Packed Bed Reactors

et al. 2022

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Elemental sulfur-driven autotrophic denitrification (SADN) process is becoming a promising and cost-effective process for treating low C/N ratio wastewaters. However, the low bioavailability of sulfur particles is a key technical barrier of the SADN process, resulting in a low-nitrogen removal rate and restricting process upscaling. Given that polysulfuration from the abiotic reaction between sulfur and sulfide can significantly improve sulfur bioavailability, we proposed a novel polysulfide-involved SADN (PiSADN) process to achieve high-rate autotrophic nitrate removal. In the two sulfur-packed bed reactors (S0-PBRs) operated in parallel, we realized the PiSADN process to accelerate nitrate removal without the addition of exogenous chemicals (i.e., sulfide and organics). The results showed that high nitrate removal rates (1.46–1.65 kg N/m3-d) were obtained in the S0-PBRs during the long-term trials, which were substantially higher than those previously reported in SADN systems under similar conditions. Sulfur disproportionation (SD) was found to be the key biochemical reaction for the establishment of a self-driven PiSADN process because SD could produce sulfide and stimulate polysulfuration. 16S rRNA gene amplicon sequencing and genome-centric metagenomics analysis provided evidence for the presence of sulfur-disproportionating bacteria in the bioreactors (e.g., Dissulfurimicrobium sp.). Increasing initial bicarbonate concentration and/or pH level could enhance the SD process and polysulfuration and then facilitate the PiSADN process. These findings suggested that the PiSADN process could achieve highly efficient autotrophic denitrification with SD being a probable key factor for maintaining the self-driven PiSADN process.

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“…Significant changes in their abundances may have been caused by the washing of ESAD filters. Furthermore, Ferritrophicum was verified as a denitrification bacterium ( Wan et al, 2019 ), its enrichment is helpful for the denitrification process, which also indicates that although washing ESAD filter will cause changes in the structure of bacterial community, the main bacteria are still the denitrifying bacteria. The existence of Rhodanobacter may be that the ESAD filter could block the bacteria in O3 effluent, which helps in realising the ND processes simultaneously, and further contributes to the decrease of sulfate productivity in the effluent.…”

Section: Resultsmentioning

confidence: 99%

An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application

et al. 2022

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In this paper, the anoxic/aerobic/aerobic/anoxic (AOOA) process was proposed using fixed biofilms in a continuous plug-flow multi-chamber reactor, and no sludge reflux operation was performed during the 190 days of operation. The reactor volume ratio of 1.5:2:1.5:1 (A/O/O/A) with the dissolved oxygen (DO) concentration of 2 mg L−1 in the aerobic zone was the optimal condition for reactor operation. According to the results obtained from the treatment of real domestic sewage, when the hydraulic retention time (HRT) was 6 h, the effluent of the reactor could meet the discharge standard even in cold conditions (13°C). Specifically, the elemental-sulfur-based autotrophic denitrification (ESAD) process contributed the most to the removal of total inorganic nitrogen (TIN) in the reactor. In addition, the use of vibration method was helpful in removing excess sludge from the biofilms of the reactor. Overall, the AOOA process is an efficient and convenient method for treating domestic sewage.

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Simultaneous reduction of perchlorate and nitrate in a combined heterotrophic-sulfur-autotrophic system: Secondary pollution control, pH balance and microbial community analysis

Cited by 57 publications

References 77 publications

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Achieving a Novel Polysulfide-Involved Sulfur-Based Autotrophic DenitrificationProcess for High-Rate Nitrogen Removal in Elemental Sulfur-Packed Bed Reactors

An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application

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