Trace metals supplementation in anaerobic membrane bioreactors treating highly saline phenolic wastewater

Sierra, Julian Muñoz; Lafita, Carlos; Gabaldón, Carmen; Spanjers, Henri; Lier, J.B. van

doi:10.1016/j.biortech.2017.03.032

Cited by 32 publications

(14 citation statements)

References 44 publications

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“…•L −1 which might have had an impact as well, even though the biomass was adapted to this Na + concentration. In agreement with literature (Fang and Chan, 1997;Olguin-Lora et al, 2003;Collins et al, 2005;Muñoz Sierra et al, 2017), the results obtained in this research showed that a phenol concentration of 50 mg•L −1 caused no negative effect on the SMA when compared to the control without phenol. As well, the average SMA at phenol concentration of 200 mg•L −1 was not affected, but phenol concentration of 500 mg•L −1 decreased the SMA with 27%.…”

Section: Resultssupporting

confidence: 92%

“…Although phenol may affect all main physiological microbial populations of the AD process, it is reported, as with other inhibitory or toxic substances (Astals et al, 2015), that the acetoclastic methanogenic population could be the most affected group (Chen et al, 2008). Half maximum inhibitory concentration (IC 50 ) ranges between 50 and 1,750 mg•L −1 for non-adapted and phenol-degrading biomass have been reported (Fang and Chan, 1997;Olguin-Lora et al, 2003;Collins et al, 2005;Muñoz Sierra et al, 2017).…”

Section: Resultsmentioning

confidence: 99%

“…Several studies have researched the anaerobic degradation of phenol, as well in some studies different CES have been used to promote or enhance the degradation of phenol under anaerobic conditions (Liang and Fang, 2010), e.g., glucose (Tay et al, 2001), volatile fatty acids (VFAs) (Carbajo et al, 2010), or acetate (Muñoz Sierra et al, 2017). Additional CES have been used as well during the reactor start-up, or for the degradation of mixtures of phenolic compounds.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Phenol Conversion Rates in Saline Anaerobic Membrane Bioreactor Using Acetate and Butyrate as Additional Carbon and Energy Sources

et al. 2020

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Phenolic industrial wastewater, such as those from coal gasification, are considered a challenge for conventional anaerobic wastewater treatment systems because of its extreme characteristics such as presence of recalcitrant compounds, high toxicity, and salinity. However, anaerobic membrane bioreactors (AnMBRs) are considered of potential interest since they retain all micro-organism that are required for conversion of the complex organics. In this study, the degradation of phenol as main carbon and energy source (CES) in AnMBRs at high salinity (8.0 g Na+⋅L–1) was evaluated, as well as the effect of acetate and an acetate-butyrate mixture as additional CES on the specific phenol conversion rate and microbial community structure. Three different experiments in two lab-scale (6.5 L) AnMBRs (35°C) were conducted. The first reactor (R1) was fed with phenol as the main CES, the second reactor was fed with phenol and either acetate [2 g COD⋅L–1], or a 2:1 acetate-butyrate [2 g COD⋅L–1] mixture as additional CES. Results showed that phenol conversion could not be sustained when phenol was the sole CES. In contrast, when the reactor was fed with acetate or an acetate-butyrate mixture, specific phenol conversion rates of 115 and 210 mgPh⋅gVSS–1 d–1, were found, respectively. The syntrophic phenol degrader Syntrophorhabdus sp. and the acetoclastic methanogen Methanosaeta sp. were the dominant bacteria and archaea, respectively, with corresponding relative abundances of up to 63 and 26%. The findings showed that dosage of additional CES allowed the development of a highly active phenol-degrading biomass, potentially improving the treatment of industrial and chemical wastewaters.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing Phenol Conversion Rates in Saline Anaerobic Membrane Bioreactor Using Acetate and Butyrate as Additional Carbon and Energy Sources

et al. 2020

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“…They reported little effect from low doses, but with an SRT of 200 days and inoculum from a municipal sewage treatment plant, it is possible that washout of some TE to critical levels had not yet occurred. Sierra et al [51] looked at the partitioning of trace elements B, Co, Cu, Mg, Mn, Mo, Ni, Se and W and at the effect of additional supplementation with Co and W in an AnMBR treating a highly saline phenolic wastewater. Additional Co had little effect, but W was beneficial.…”

Section: Cod Removal Rates and Te Requirementsmentioning

confidence: 99%

Operation of Submerged Anaerobic Membrane Bioreactors at 20 °C: Effect of Solids Retention Time on Flux, Mixed Liquor Characteristics and Performance

2021

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Four flat-sheet submerged anaerobic membrane bioreactors ran for 242 days on a simulated domestic wastewater with low Chemical Oxygen Demand (COD) and high suspended solids. Organic loading was maintained around 1.0 g COD L−1 day−1, while solids retention time (SRT) was varied from 20–90 days. This was achieved at a constant membrane flux, maintained by adjusting transmembrane pressure (TMP) in the range 1.8-9.8 kPa. Membrane fouling was assessed based on the required TMP, with mixed liquors characterised using capillary suction time, frozen image centrifugation and quantification of extracellular polymeric substances (EPS). SRT had a significant effect on these parameters: fouling was least at an SRT of 30 days and highest at 60 days, with some reduction as this extended to 90 days. Operation at SRT <30 days showed no further benefits. Although operation at a short SRT was optimal for membrane performance it led to lower specific methane productivity, higher biomass yields and higher effluent COD. Short SRT may also have accelerated the loss of essential trace elements, leading to reduced performance under these conditions. A COD-based mass balance was conducted, including both biomass and methane dissolved in the effluent.

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“…Phenols are major contaminants found in wastewaters of several chemical industries, which are often discharged at high temperatures (Busca et al, 2008;Rosenkranz et al, 2013;Wang et al, 2017). Additionally, closing water loops in the chemical sector often result in concentrated, highly saline wastewaters, which increases the complexity of the produced wastewater (Muñoz Sierra et al, 2017). Despite the existing physicochemical processes applied for phenol removal, i.e., membrane distillation, pervaporation, adsorption, extraction, nanofiltration, reverse osmosis, and oxidation processes (wet air, electrochemical, ozonation, UV/H 2 O 2 , Fenton) (Villegas et al, 2016;Raza et al, 2019); biological treatment processes are preferred due to its cost-effectiveness.…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Conversion of Saline Phenol-Containing Wastewater Under Thermophilic Conditions in a Membrane Bioreactor

Sierra

Rea

Cerqueda-García

et al. 2020

Front. Bioeng. Biotechnol.

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Closing water loops in chemical industries result in hot and highly saline residual streams, often characterized by high strength and the presence of refractory or toxic compounds. These streams are attractive for anaerobic technologies, provided the chemical compounds are biodegradable. However, under such harsh conditions, effective biomass immobilization is difficult, limiting the use of the commonly applied sludge bed reactors. In this study, we assessed the long-term phenol conversion capacity of a lab-scale anaerobic membrane bioreactor (AnMBR) operated at 55 • C, and high salinity (18 gNa +. L −1). Over 388 days, bioreactor performance and microbial community dynamics were monitored using specific methanogenic activity (SMA) assays, phenol conversion rate assays, volatile fatty acids permeate characterization and Illumina MiSeq analysis of 16S rRNA gene sequences. Phenol accumulation to concentrations exceeding 600 mgPh. L −1 in the reactor significantly reduced methanogenesis at different phases of operation, while applying a phenol volumetric loading rate of 0.12 gPh. L −1. d −1. Stable AnMBR reactor performance could be attained by applying a sludge phenol loading rate of about 20 mgPh. gVSS −1. d −1. In situ maximum phenol conversion rates of 21.3 mgPh. gVSS −1. d −1 were achieved, whereas conversion rates of 32.8 mgPh. gVSS −1. d −1 were assessed in ex situ batch tests at the end of the operation. The absence of caproate as intermediate inferred that the phenol conversion pathway likely occurred via carboxylation to benzoate. Strikingly, the hydrogenotrophic SMA of 0.34 gCOD-CH 4. gVSS −1. d −1 of the AnMBR biomass significantly exceeded the acetotrophic SMA, which only reached 0.15 gCOD-CH 4. gVSS −1. d −1. Our results indicated that during the course of the experiment, acetate conversion gradually changed from acetoclastic methanogenesis to acetate oxidation coupled to hydrogenotrophic methanogenesis. Correspondingly, hydrogenotrophic methanogens of the class Methanomicrobia, together with Synergistia, Thermotogae, and Clostridia classes, dominated the microbial community and were enriched during the three phases of operation, while the aceticlastic Methanosaeta species remarkably decreased. Our findings clearly showed that highly saline phenolic wastewaters could be satisfactorily

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Trace metals supplementation in anaerobic membrane bioreactors treating highly saline phenolic wastewater

Cited by 32 publications

References 44 publications

Enhancing Phenol Conversion Rates in Saline Anaerobic Membrane Bioreactor Using Acetate and Butyrate as Additional Carbon and Energy Sources

Enhancing Phenol Conversion Rates in Saline Anaerobic Membrane Bioreactor Using Acetate and Butyrate as Additional Carbon and Energy Sources

Operation of Submerged Anaerobic Membrane Bioreactors at 20 °C: Effect of Solids Retention Time on Flux, Mixed Liquor Characteristics and Performance

Anaerobic Conversion of Saline Phenol-Containing Wastewater Under Thermophilic Conditions in a Membrane Bioreactor

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