Showing papers on "Bioreactor published in 2017"
TL;DR: UAMAS is the best configuration for methane production from POME during anaerobic treatment, and could contribute to energy sources of oil palm producing nations, while preventing the attendant environmental impacts associated with its disposal.
Abstract: Palm oil mill effluent (POME) is generated from the sterilization, condensation and hydrocycloning of palm oil in mills. If the effluent is discharged into the aquatic and terrestrial ecosystem without treatment, it could lead to high biological oxygen demand (BOD), chemical oxygen demand (COD) and acidic pH of the receiving waters. Biogas consisting mostly of methane, carbon dioxide, and to a lesser hydrogen has been produced through anaerobic treatment of this toxic effluent. The process of biogas production involves microbial synthesis involving hydrolysis, acidogenesis, acetogenesis and methanogenesis. Biogas is formed during anaerobic degradation of POME by indigenous microbial communities. This review updates the current state of art of biogas production through anaerobic digestion of POME using different configurations of reactors such as fluidized bed reactor, anaerobic filtration, up-flow anaerobic sludge blanket (UASB) reactor, anaerobic contact digestion, up-flow anaerobic sludge fixed-film (UASFF) reactor, modified anaerobic baffled bioreactor (MABB), anaerobic baffled bioreactor (ABR), continuous stirred tank reactor (CSTR), expanded granular sludge bed (EGSB) reactor, Ultrasonicated membrane anaerobic system (UMAS), Ultrasonic-assisted Membrane Anaerobic System (UAMAS), membrane anaerobic system (MAS)and upflow anaerobic sludge blanket reactor (UASBR). The factors that influences biogas yield during treatment include pH, temperature (environmental factors), organic loading rate (OLR), hydraulic retention time (HRT), mixing rate, pressure, equilibrium, nutrient and microbial activities (Internal factors). Based on this study, UAMAS is the best configuration for methane production from POME during anaerobic treatment. Biogas from POME could contribute to energy sources of oil palm producing nations, while preventing the attendant environmental impacts associated with its disposal.
136 citations
TL;DR: An aluminum dioxide (Al2O3) ceramic membrane was used in a single-stage anaerobic fluidized bed ceramic membrane bioreactor (AFCMBR) for low-strength wastewater treatment and no adverse effect of the maintenance cleaning on organic removal was observed.
102 citations
TL;DR: Anaerobic treatment of wastewater and waste organic solvents originating from the pharmaceutical and chemical industries was tested in a pilot anaerobic membrane bioreactor, which was operated for 580days under different operational conditions to test the long-term treatment efficiency and identify inhibitory factors.
90 citations
TL;DR: The results highlight that identification of optimal pH, DO, agitation rates and culture medium for microcarrier-based bioreactor expansion of adherent cells is paramount to developing a platform to support cell-based therapies.
87 citations
TL;DR: Coupling ceramic membrane filtration with AnMBR treatment provides an alternative strategy for high organic wastewater treatment at short hydraulic retention times (HRTs) with the potential benefits of membrane fouling because they have a high hydrophilicity and more robust at extreme conditions.
84 citations
TL;DR: In this article, a microfiltration-assisted Anaerobic osmotic membrane bioreactor (AnMF-OMBR) was proposed to mitigate salt accumulation in wastewater.
82 citations
TL;DR: The hybrid moving bed biofilm reactor–membrane bioreactor showed the best efficiency regardingorganic matter removal for low hydraulic retention times, so this system would enable the rehabilitation of activated sludge plants and membrane bioreactors that did not comply with legislation regarding organic matter removal.
Abstract: This review carries out a comparative study of advanced technologies to design, upgrade and rehabilitate wastewater treatment plants. The study analyzed the relevant researches in the last years about the moving bed biofilm reactor process with only attached biomass and with hybrid biomass, which combined attached and suspended growth; both could be coupled with a secondary settling tank or microfiltration/ultrafiltration membrane as a separation system. The physical process of membrane separation improved the organic matter and NH4
+-N removal efficiencies compared with the settling tank. In particular, the pure moving bed biofilm reactor–membrane bioreactor showed average chemical oxygen demand, biochemical oxygen demand on the fifth day and total nitrogen removal efficiencies of 88.32, 90.84 and 60.17%, respectively, and the hybrid moving bed biofilm reactor–membrane bioreactor had mean chemical oxygen demand, biochemical oxygen demand on the fifth day and total nitrogen reduction percentages of 91.18, 97.34 and 68.71%, respectively. Moreover, the hybrid moving bed biofilm reactor–membrane bioreactor showed the best efficiency regarding organic matter removal for low hydraulic retention times, so this system would enable the rehabilitation of activated sludge plants and membrane bioreactors that did not comply with legislation regarding organic matter removal. As the pure moving bed biofilm reactor–membrane bioreactor performed better than the hybrid moving bed biofilm reactor–membrane bioreactor concerning the total nitrogen removal under low hydraulic retention times, this system could be used to adapt wastewater treatment plants whose effluent was flowed into sensitive zones where total nitrogen concentration was restricted. This technology has been reliably used to upgrade overloaded existing conventional activated sludge plants, to treat wastewater coming from textile, petrochemical, pharmaceutical, paper mill or hospital effluents, to treat wastewater containing recalcitrant compounds efficiently, and to treat wastewater with high salinity and/or low and high temperatures.
78 citations
TL;DR: The microbial recovery cell (MRC)-AnOMBR system showed excellent organic and phosphorus removal and maintained effluent COD below 20 mg/L and effectively recovered up to 65% PO43- and 45% NH4+ from the influent, which can be further improved if membranes with higher selectivity are used.
77 citations
TL;DR: In this paper, the authors evaluated the impact of SRT on the treatment and filtration characteristics of sequential anaerobic sulfate-reducing and aerobic sulfide-oxidizing MBRs treating textile wastewater.
71 citations
TL;DR: Development of an effective repeatable bioprocess using enzymes for the treatment of dye-contaminated effluent has potential for implementation on an industrial scale.
70 citations
TL;DR: This work presents a mixed population phototrophic model for domestic wastewater treatment in anaerobic conditions and assesses the process by analyzing a continuous reactor simulation scenario within a long-term wastewater treatment system in a photo-anaerobic membrane bioreactor.
TL;DR: The results demonstrated an alternative option for cultivating stable GS directly in a continuous-flow membrane bioreactor and showed the main factors to determine the cultivation of GS included the total retention of sludge by the membrane module, the internal hydrodynamic circulation, and the entanglement of filamentous bacteria to sludge particles.
TL;DR: In this article, the performance of intermittently aerated dynamic membrane bioreactor for the treatment of chromium containing synthetic textile wastewater was investigated under continuous or intermittent aeration conditions with aeration on/off durations of 5/3min, 1/10min, and 1/15min.
TL;DR: The batch experiment indicated that the co-cultivation of algae and wastewater-borne bacteria improved the removal efficiencies of chemical oxygen demand and total phosphorus in centrate wastewater to 93.01% and 98.78%, respectively.
TL;DR: The study demonstrated that stripping the bioH2 fermenter with its own, self-generated atmosphere after adjusting its composition (to higher CO2-content) can be a promising way to intensify dark fermentative H2 evolution.
TL;DR: Microbial analysis suggested that dominant genera were Thiothrix, Gemmata, un classified comanonadaceae, unclassified Rhizobiales, Salipiger, Chloronema and Klebsiella in optimal combined bioreactor, which indicated novel co-existence of heterotrophic nitrification, solid-phase, non-solid-phase heterotroph and sulfur-based autotrophic denitrification for achieving efficient SND.
TL;DR: This study successfully attained a highly efficient and stable isFBB for enhanced SA production by Y. lipolytica and showed no obvious decrease after 12 repeated batches of 460h fermentation, and cell viability even recovered within two repeated batches after intentional interruption.
TL;DR: It was found that the increased load did not result in any decrease in 4-chlorophenol removal rate, and it was shown that the continuous two-phase partitioning bioreactor has significant potential in enhancing the biological treatment of tannery wastewater, which is a typical representative of industrial “hostile” wastewater.
TL;DR: The first report on the dominance of candidate Saccharibacteria and on the examination of their metabolic behavior in a bioreactor treating real wastewater is reported, as a result of the low organic carbon availability that extendedly induced β-glucosidases to breakdown the least biodegradable organic fraction.
TL;DR: A novel two-phase bioreactor for the microbial removal of Cr( VI) from wastewater with high chromium concentration (up to 1350ppm) is developed and Cloisite® 30B, a natural montmorillonite modified with a quaternary ammonium salt that absorbs Cr(VI) in a reversible manner proved to be optimal as the solid phase of theBioreactor.
TL;DR: Microbial characteristics and oil sands process-affected water (OSPW) treatment performance of five types of microbial biomass cultivated from three types of bioreactors are compared and MBBR-biofilm demonstrated the most efficient NAs removal from OSPW.
TL;DR: By coupling biological treatment and two high rejection membrane processes, the OMBR-MD hybrid system could effectively remove all 30 trace organic contaminants of significant concern investigated here and produce high quality water.
Abstract: In this study, we demonstrate the potential of an osmotic membrane bioreactor (OMBR)–membrane distillation (MD) hybrid system for simultaneous wastewater reuse and seawater desalination. A stable OMBR water flux of approximately 6 L m–2 h–1 was achieved when using MD to regenerate the seawater draw solution. Water production by the MD process was higher than that from OMBR to desalinate additional seawater and thus account for draw solute loss due to the reverse salt flux. Amplicon sequencing on the Miseq Illumina platform evidenced bacterial acclimatization to salinity build-up in the bioreactor, though there was a reduction in the bacterial community diversity. In particular, 18 halophilic and halotolerant bacterial genera were identified with notable abundance in the bioreactor. Thus, the effective biological treatment was maintained during OMBR–MD operation. By coupling biological treatment and two high rejection membrane processes, the OMBR–MD hybrid system could effectively remove (>90%) all 30 trac...
TL;DR: A robust strain of Bacillus coagulans found to be a robust strain able to tolerate high concentrations of hydrolysate obtained from wheat straw pre-treated by acid-catalysed (pre-)hydrolysis and steam explosion, especially when cultivated in controlled bioreactor conditions is an appealing starting point for future development of a consolidated bioprocess for production of lactic acid from lignocellulosic biomass.
Abstract: The transition from a petroleum-based economy towards more sustainable bioprocesses for the production of fuels and chemicals (circular economy) is necessary to alleviate the impact of anthropic activities on the global ecosystem. Lignocellulosic biomass-derived sugars are suitable alternative feedstocks that can be fermented or biochemically converted to value-added products. An example is lactic acid, which is an essential chemical for the production of polylactic acid, a biodegradable bioplastic. However, lactic acid is still mainly produced by Lactobacillus species via fermentation of starch-containing materials, the use of which competes with the supply of food and feed. A thermophilic and cellulolytic lactic acid producer was isolated from bean processing waste and was identified as a new strain of Bacillus coagulans, named MA-13. This bacterium fermented lignocellulose-derived sugars to lactic acid at 55 °C and pH 5.5. Moreover, it was found to be a robust strain able to tolerate high concentrations of hydrolysate obtained from wheat straw pre-treated by acid-catalysed (pre-)hydrolysis and steam explosion, especially when cultivated in controlled bioreactor conditions. Indeed, unlike what was observed in microscale cultivations (complete growth inhibition at hydrolysate concentrations above 50%), B. coagulans MA-13 was able to grow and ferment in 95% hydrolysate-containing bioreactor fermentations. This bacterium was also found to secrete soluble thermophilic cellulases, which could be produced at low temperature (37 °C), still retaining an optimal operational activity at 50 °C. The above-mentioned features make B. coagulans MA-13 an appealing starting point for future development of a consolidated bioprocess for production of lactic acid from lignocellulosic biomass, after further strain development by genetic and evolutionary engineering. Its optimal temperature and pH of growth match with the operational conditions of fungal enzymes hitherto employed for the depolymerisation of lignocellulosic biomasses to fermentable sugars. Moreover, the robustness of B. coagulans MA-13 is a desirable trait, given the presence of microbial growth inhibitors in the pre-treated biomass hydrolysate.
TL;DR: Prolonged operation under the antibiotics loading promoted the adaptation of multi-drug resistant fungus Scedosporium boydii fungal species and of Acidovorax ebreus TPSY, Alcaligenes aquatilis, Paracoccus versutus or Ochrobactrum antropii, which have been identified as human, animal and/or plant pathogens.
TL;DR: High-throughout pyrosequencing analysis revealed that beta-Proteobacteria were predominant members in both AFMBRs, which contributed to the development of biofilms on the fluidized GAC and membrane surfaces, and it was also noted that the abundance of the identified dominant in the membrane surface-associated biofilm seemed to be related to the permeate flux and reactor configuration.
TL;DR: In this article, anaerobic ceramic membrane bioreactor (AnCMBR) was used for domestic wastewater treatment for facile and enhanced energy recovery, where pyrophyllite-based membranes were explored by evaluating filtration and treatment performances.
TL;DR: The integrated anaerobic/aerobic sequencing batch reactor (IAASBR) is designed for treating high-strength wastewater such as poultry slaughterhouse wastewater (PSW) along with the simultaneous removal of organic carbon and ammoniacal nitrogen (NH3-N) as discussed by the authors.
TL;DR: In this paper, a mixed culture packed bed bioreactor was set up to digest anaerobically, under an acidogenic condition, a water solution of a cheese whey powder.
Abstract: Volatile fatty acids (VFAs) were produced using cheese whey as feedstock. A mixed culture packed bed bioreactor was set up to digest anaerobically, under an acidogenic condition, a water solution of a cheese whey powder. Batch tests pointed out that the whole VFAs production process occurred via two sequential phases: (a) conversion of lactose into lactic acid and (b) conversion of lactic acid into a mixture of VFAs. Furthermore, the same tests showed that the ceramic material Vukopor S10 can be used as an effective support for cell immobilization in anaerobic fermentation processes. The effect of the hydraulic retention time (HRT) and organic loading rate (OLR) were then studied in a benchtop bioreactor operated continuously. By a HRT of 6 days, ORL of 4.2 g/L/d, and pH 5.8–6, 16 g·L–1 of total VFAs were produced, with a yield higher than 75% (CmolVFAs·Cmollactose–1). Characterization with Illumina-based sequencing suggested that high VFAs productivities were obtained when microbial community structures ...
TL;DR: In this paper, a bioreactor assisted by an electromagnetic field was used for the synthesis of methyl esters from cocos nucifera and ethanol using lipase from Pseudomonas fluorescens immobilized on chitosan with magnetic properties.
TL;DR: In this paper, a core-shell structured polyvinyl alcohol/sodium alginate gel bead was fabricated and the thickness of the outer layer was controlled to protect strictly anaerobic ANAMMOX bacteria from oxygen inhibition.