Effects of hydraulic retention time and sulfide toxicity on ethanol and acetate oxidation in sulfate-reducing metal-precipitating fluidized-bed reactor

2004 ◽  
Vol 86 (3) ◽  
pp. 332-343 ◽  
Author(s):  
Anna H. Kaksonen ◽  
Peter D. Franzmann ◽  
Jaakko A. Puhakka
Keyword(s):  
Fluidized Bed ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Fluidized Bed Reactor ◽  
Acetate Oxidation ◽  
Sulfate Reducing ◽  
Sulfide Toxicity

scholarly journals EFFECTS OF ORGANIC LOADING RATE AND HYDRAULIC RETENTION TIME ON TREATMENT OF PHENOLIC WASTEWATER IN AN ANAEROBIC IMMOBILIZED FLUIDIZED BED REACTOR

2014 ◽  
Vol 22 (1) ◽  
pp. 40-49 ◽  
Author(s):  
Roya Pishgar ◽  
Ghasem D. Najafpour ◽  
Bahram Navayi Neya ◽  
Zeinab Bakhshi ◽  
Nafise Mousavi
Keyword(s):  
Fluidized Bed ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Biogas Production ◽  
Fluidized Bed Reactor ◽  
Phenol Concentration ◽  
Total Alkalinity ◽  
Organic Loading ◽  
Phenolic Wastewater ◽  
Removal Efficiencies

Treatability of phenolic wastewater in an anaerobic immobilized fluidized bed reactor (AIFBR) in consequence of stepwise increment in phenolic load as well as decrease in hydraulic retention time (HRT) was investigated. The experimental data indicated that high degradation efficiencies of phenol and COD in the bioreactor at low HRTs and high organic loading rates were obtained. At constant HRT of 16 h with increase in influent phenol concentration from 98 to 630 mg/l, the average phenol and COD removals were 96 and 88%, respectively. However, further increase in phenol concentration in the feed stream to 995 mg/l resulted in decrease in phenol and COD removal efficiencies to 84 and 79%, respectively. For influent phenol concentration of 995 mg/l, the biogas production rate of 4.55 l/l.d was obtained. As HRT decreased from 3 to 0.15 day, the system showed high stability; influent phenol and COD were removed and reached to average values of 17 and 173 mg/l correspond to the removal efficiencies of about 97 and 90.5%, respectively. The bioreactor experienced a failure with further decrease in HRT to 0.1 day. Biogas production was gradually decreased from 7.04 l/l.d at HRT of 3 days to 2.23 l/l.d at HRT of 0.1 days. The value of the ratio of volatile fatty acids to total alkalinity (VFAs/TA) ranged from 0.03 to 0.24 during the entire course of operation.

scholarly journals Evaluasi Hydraulic Retention Time (Hrt) Terhadap Removal Chemical Demand (Cod) Dalam Pengolahan Air Lindi Menggunakan Aerobic Fluidized Bed Reactor (AFBR)

2018 ◽  
Vol 2 (2) ◽  
pp. 28
Author(s):  
Elli Prasetyo
Keyword(s):  
Steady State ◽  
Chemical Oxygen Demand ◽  
Fluidized Bed ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Oxygen Demand ◽  
Fluidized Bed Reactor ◽  
Start Up

Sampah merupakan masalah utama disetiap kota besar di indonesia. Tumpukan sampah menghasilkan air lindi dengan kandungan organik yang tinggi. Beban organik yang tinggi dan meningkatnya laju alir lindi memerlukan kolam aerasi yang luas untuk mengolah lindi. Salah satu metode pengolahan air lindi yang tepat dan efisien dengan menggunakan proses anaerobik. Anaerobic Fludized Bed Reaktor (AFBR) merupakan salah satu reactor anaerobic dengan efisiensi tinggi. Zeolit digunakan sebagai media imobilisasi bakteri untuk meningkatkan efisiensi pengolahan secara anaerobic pada reactor AFBR. Penyesuaian model kinetika dilakukan pada tahap awal menggunakan data reactor fase batch untuk diaplikasikan pada AFBR fase continyu. Model kinetika untuk mengevaluasi pengaruh Hydraulic Retention Time (HRT) terhadap removal Chemical Oxygen Demand (COD) AFBR dengan zeolit sebagai media imobilisasi. Eksperimen dilakukan dalam tiga fase, yaitu fase batch, fase start-up, dan fase steady state. Fase batch bertujuan untuk menentukan konstanta model kinetika. Fase start-up bertujuan untuk memverifikasi konstanta model yang ditentukan dengan data batch pada AFBR saat masa start up. Fase steady state bertujuan untuk mengevaluasi pengaruh HRT selama reactor beroperasi. Reaktor AFBR mencapai kondisi steady state tercepat pada HRT 10 dengan removal COD 73,40%. Hal ini membuktikan bahwa mikroorganisme tidak mengalami washout bahkan pada laju beban organik yang lebih tinggi sehingga mikroorganisme dapat menstabilkan populasinya. Data menunjukkan bahwa sCOD effluen (SCODeff) lindi TPA Piyungan mencapai nilai terendah pada kisaran 2.000 – 2.500 mg/L, Produksi biogas mengikuti fluktuasi nilai sCODeff. Pada kondisi steady state, nilai ini tidak dipengaruhi oleh HRT.

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

Biofilm development during the start-up of a sulfate-reducing down-flow fluidized bed reactor at different COD/SO42− ratios and HRT

2011 ◽  
Vol 64 (4) ◽  
pp. 910-916 ◽  
Author(s):  
E. Z. Piña-Salazar ◽  
F. J. Cervantes ◽  
M. Meraz ◽  
L. B. Celis
Keyword(s):  
Fluidized Bed ◽  
Granular Sludge ◽  
Fluidized Bed Reactor ◽  
Sulfate Reducing ◽  
Sulfate Removal ◽  
Start Up ◽  
Effective Removal ◽  
Suspended Biomass ◽  
High Sulfate ◽  
Biofilm Development

In sulfate-reducing reactors, it has been reported that the sulfate removal efficiency increases when the COD/SO42− ratio is increased. The start-up of a down-flow fluidized bed reactor constitutes an important step to establish a microbial community in the biofilm able to survive under the operational bioreactor conditions in order to achieve effective removal of both sulfate and organic matter. In this work the influence of COD/SO42− ratio and HRT in the development of a biofilm during reactor start-up (35 days) was studied. The reactor was inoculated with 1.6 g VSS/L of granular sludge, ground low density polyethylene was used as support material; the feed consisted of mineral medium at pH 5.5 containing 1 g COD/L (acetate:lactate, 70:30) and sodium sulfate. Four experiments were conducted at HRT of 1 or 2 days and COD/SO42− ratio of 0.67 or 2.5. The results obtained indicated that a COD/SO42− ratio of 2.5 and HRT 2 days allowed high sulfate and COD removal (66.1 and 69.8%, respectively), whereas maximum amount of attached biomass (1.9 g SVI/L support) and highest sulfate reducing biofilm activity (10.1 g COD-H2S/g VSS-d) was achieved at HRT of 1 day and at COD/sulfate ratios of 0.67 and 2.5, respectively, which suggests that suspended biomass also played a key role in the performance of the reactors.

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