Sulfate and dissolved sulfide variation under low COD/Sulfate ratio in Up-flow Anaerobic Sludge Blanket (UASB) treating domestic wastewater

Subtil, Eduardo Lucas; Cassini, Sérvio Túlio Alves; Gonçãlves, Ricardo Franci

doi:10.4136/ambi-agua.849

Cited by 9 publications

(1 citation statement)

References 25 publications

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“…To achieve high organic matter rejection, forward osmosis (FO) has been used in DMF applications. However, the draw solution regeneration [32], low concentration factor, and sulfate retention in the concentrate which cause serious problems for anaerobic digestion (i.e., toxicity, odor, and reduced methane production) are significant drawbacks [6,33,34]. On the other hand, increased amounts of GO in the membrane separating layer can improve separation capability of porous membrane by enhancing the exclusion mechanism, while reducing the effect of fouling-induced flow loss [14].…”

Section: Introductionmentioning

confidence: 99%

Direct membrane filtration (DMF) of municipal wastewater by mixed matrix membranes (MMMs) filled with graphene oxide (GO): Towards a circular sanitation model

Subtil

Ragio

Lemos

et al. 2022

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Direct membrane filtration (DMF) of municipal wastewater by mixed matrix membranes (MMMs) filled with graphene oxide (GO): Towards a circular sanitation model

Subtil

Ragio

Lemos

et al. 2022

Chemical Engineering Journal

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Innovative anaerobic bioreactor with fixed-structured bed (ABFSB) for simultaneous sulfate reduction and organic matter removal

Camiloti

Mockaitis

Rodrigues

et al. 2013

J. Chem. Technol. Biotechnol.

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BACKGROUND: The anaerobic treatment of wastewaters is usually applied to remove the organic matter, converting it into methane. The presence of sulfate in some wastewaters produces sulphide during anaerobic biological processing, which is known as an inhibitor of biological processes. In this study, a novel anaerobic bioreactor with a fixed structured bed (ABFSB) was subjected to simultaneous sulfate reduction and organic matter removal. RESULTS: Synthetic wastewater was used as organic substrate and the bioreactor performance was studied with different COD/[SO 42− ] ratios: 0.72, 1.7, 3.5 and 6.1. The highest COD and sulfate removal efficiencies were achieved at a COD/[SO 4 2− ] ratio of 1.7 (82 and 89%, respectively). Also, in this condition a greater overall kinetic apparent parameter (0.96 h −1 ) was observed. The kinetic parameters indicate that the sulfate reducing bacteria played an important role in the organic matter removal process over a range of COD/[SO 42− ] ratios from 6.1 to 1.7.CONCLUSIONS: Concerning the organic matter removal, the best synergy between sulfate reduction bacteria and metanogenic archaea communities was achieved in COD/[SO 4 2− ] ∼1.7. The ABSFB was suitable for the simultaneous organic matter and sulfate removal, especially when the COD/[SO 4 2− ] ratio was 1.7, but demonstrating a stable and efficient process in all conditions studied.

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Biological synthesis of nanosized sulfide semiconductors: current status and future prospects

Costa

Girão

Trindade

et al. 2016

Appl Microbiol Biotechnol

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There have been extensive and comprehensive reviews in the field of metal sulfide precipitation in the context of environmental remediation. However, these works have focused mainly on the removal of metals from aqueous solutions-usually, metal-contaminated effluents-with less emphasis on the precipitation process and on the end-products, frequently centering on metal removal efficiencies. Recently, there has been an increasing interest not only in the possible beneficial effects of these bioremediation strategies for metal-rich effluents but also on the formed precipitates. These metal sulfide materials are of special relevance in industry, due to their optical, electronic, and mechanical properties. Hence, identifying new routes for synthesizing these materials, as well as developing methodologies allowing for the control of the shape and size of particulates, is of environmental, economic, and practical importance. Multiple studies have shown proof-of-concept for the biological synthesis of inorganic metallic sulfide nanoparticles (NPs), resorting to varied organisms or cell components, though this information has scarcely been structured and compiled in a systematic manner. In this review, we overview the biological synthesis methodologies of nanosized metal sulfides and the advantages of these strategies when compared to more conventional chemical routes. Furthermore, we highlight the possibility of the use of numerous organisms for the synthesis of different metal sulfide NPs, with emphasis on sulfate-reducing bacteria (SRB). Finally, we put in perspective the potential of these methodologies in the emerging research areas of biohydrometallurgy and nanobiotechnology for the uptake of metals in the form of metal sulfide nanoparticles. A more complete understanding of the principles underlying the (bio)chemistry of formation of solids in these conditions may lead to the large-scale production of such metal sulfides, while simultaneously allowing an enhanced control over the size and shape of these biogenic nanomaterials.

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Sulfate and dissolved sulfide variation under low COD/Sulfate ratio in Up-flow Anaerobic Sludge Blanket (UASB) treating domestic wastewater

Cited by 9 publications

References 25 publications

Direct membrane filtration (DMF) of municipal wastewater by mixed matrix membranes (MMMs) filled with graphene oxide (GO): Towards a circular sanitation model

Direct membrane filtration (DMF) of municipal wastewater by mixed matrix membranes (MMMs) filled with graphene oxide (GO): Towards a circular sanitation model

Innovative anaerobic bioreactor with fixed-structured bed (ABFSB) for simultaneous sulfate reduction and organic matter removal

Biological synthesis of nanosized sulfide semiconductors: current status and future prospects

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