Effects of hydraulic retention time, co-substrate and nitrogen source on laundry wastewater anionic surfactant degradation in fluidized bed reactors

2017 ◽  
Vol 224 ◽  
pp. 246-254 ◽  
Author(s):  
Marcus Vinicius Freire Andrade ◽  
Isabel Kimiko Sakamoto ◽  
Juliano José Corbi ◽  
Edson Luiz Silva ◽  
Maria Bernadete Amâncio Varesche
Keyword(s):  
Nitrogen Source ◽  
Fluidized Bed ◽  
Anionic Surfactant ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Fluidized Bed Reactors ◽  
Surfactant Degradation

Biohydrogen production in anaerobic fluidized bed reactors: Effect of support material and hydraulic retention time

2010 ◽  
Vol 35 (8) ◽  
pp. 3379-3388 ◽  
Author(s):  
Aruana Rocha Barros ◽  
Eduardo Lucena Cavalcante de Amorim ◽  
Cristiane Marques Reis ◽  
Gessia Momoe Shida ◽  
Edson Luiz Silva
Keyword(s):  
Fluidized Bed ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Biohydrogen Production ◽  
Fluidized Bed Reactors ◽  
Support Material ◽  
Effect Of Support

Chlorophenol Degradation under Oxic and Anoxic Conditions

1992 ◽  
Vol 25 (1) ◽  
pp. 147-152 ◽  
Author(s):  
Jaakko A. Puhakka ◽  
Wen K. Shieh ◽  
Kimmo Järvinen ◽  
Esa Melin
Keyword(s):  
Steady State ◽  
Fluidized Bed ◽  
Electron Donor ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Potassium Nitrate ◽  
Fluidized Bed Reactors ◽  
Reactor Operation ◽  
Feed Concentration ◽  
Effective Removal

The degradation of 2,4,6,-trichlorophenol (2,4,6-TCP), 2,3,4,6-tetra-chlorophenol (2,3,4,6-TeCP) and pentachlorophenol (PCP) was evaluated in oxic fluidized-bed reactors. The pseudo-steady-state reactor operation at a hydraulic retention time of 5 hours and feed concentrations of 54 mg/l of 2,4,6-TCP and 64 mg/l of 2,3,4,6-TeCP resulted in stable and effective removal performances on these compounds. GC/MS results indicated over 99 % removal of both 2,4,6-TCP and 2,3,4,6-TeCP. However, PCP degradation at 74 mg/l feed concentration was neglible under these conditions. Further, a denitrifying biofilm was developed which was able to use 4-chlorophenol (4-CP) as the sole electron donor in denitrification reactions. No anoxie biofilm able to degrade 2,4-dichlorophenol (2,4-DCP) or PCP degradation in the presence of potassium nitrate could be developed.

Longitudinal dispersion and biomass hold-up of anaerobic fluidized bed reactors

1996 ◽  
Vol 34 (5-6) ◽  
pp. 461-468 ◽  
Author(s):  
M. Turan ◽  
I. Öztürk
Keyword(s):  
Fluidized Bed ◽  
Retention Time ◽  
Fluidized Beds ◽  
Hydraulic Retention Time ◽  
Biomass Concentration ◽  
Pulse Response ◽  
Longitudinal Dispersion ◽  
Fluidized Bed Reactors ◽  
Biofilm Growth ◽  
Biological Growth

Longitudinal dispersion in fluidized bed reactors was studied using pulse-response techniques for both clean and anaerobic-biofilm coated media. A large number of experimental data on the longitudinal dispersion and biofilm growth in the anaerobic fluidized bed reactors (AFBRs) were investigated. Some correlations applicable to fluidized beds were obtained for both the hydraulic retention time and the biomass concentration versus the ratio Pe/Re. The biomass concentration tends to zero for a critical retention time in AFBRs. The biological growth in the bed causes an increase of Pe number.

Effect of hydraulic retention time on metal precipitation in sulfate reducing inverse fluidized bed reactors

2014 ◽  
Vol 90 (1) ◽  
pp. 120-129 ◽  
Author(s):  
Denys Kristalia Villa Gomez ◽  
Anne Marie Enright ◽  
Eki Listya Rini ◽  
Audrey Buttice ◽  
Herman Kramer ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Fluidized Bed Reactors ◽  
Sulfate Reducing ◽  
Metal Precipitation ◽  
Inverse Fluidized Bed

scholarly journals The Impact of Hydraulic Retention Time on the Biomethane Production from Palm Oil Mill Effluent (POME) in Two-Stage Anaerobic Fluidized Bed Reactor

2020 ◽  
Vol 10 (1) ◽  
pp. 11-16
Author(s):  
Laily Isna Ramadhani ◽  
Sri Ismiyati Damayanti ◽  
Hanifrahmawan Sudibyo ◽  
Muhammad Mufti Azis ◽  
Wiratni Budhijanto
Keyword(s):  
Fluidized Bed ◽  
Palm Oil ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Ph Control ◽  
Palm Oil Mill Effluent ◽  
Two Stage ◽  
Second Stage ◽  
Biomethane Production ◽  
Palm Oil Mill

Indonesia is currently the most significant crude palm oil (CPO) producer in the world. In the production ofCPO, 0.7m3 of Palm Oil Mill Effluent (POME) is emitted as the wastewater for every ton of fresh fruit bunches processed in the palm oil mill.With the increasing amount of CPO production, an effective POME treatment system is urgently required to prevent severe environmental damage. The high organic content in the POME is a potential substrate forbio-methane production. The biomethane production is carried out by two groups of microbes, i.e., acidogenic and methanogenic microbes. Each group of bacteria performs optimally at different optimum conditions. To optimize the biomethane production, POME was treated sequentially by separating the acidogenic and methanogenic microbes into two stages of anaerobic fluidized bed reactors (AFBR). The steps were optimized differently according to the favorable conditions of each group of bacteria. Although perfect separation cannot be achieved, this study showed that pH control could split the domination of the bacteria, i.e., the first stage (maintained at pH 4-5) was dominated by the acidogenic microbes and the second stage (kept neutral) was governed by methanogens. In addition to the pH control, natural zeolitewas added as microbial immobilization media in the AFBR to improve the performance of the microorganisms, especially in preventing microbial wash out at short hydraulic retention time (HRT). This study was focused on the understanding of the effect of HRT on the performance of steady-state continuous AFBR. The first stage as the acidogenic reactorwas rununder acidic conditions (pH 4-5) at five different HRTs. In comparison, the second stage as the methanogenic reactorwasrun under the neutral condition at four different HRTs. In this work,short HRT (5 days) resulted in better performance in both acidogenic AFBR and methanogenic AFBR. The immobilization media was hence essential to reduce the risk of washout at such a short HRT. The two-stage system also resulted in quite a high percentage of soluble chemical oxygen demand (sCOD) removal, which was as much as 96.06%sCOD.

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