scholarly journals Microbial Removal of Pb(II) Using an Upflow Anaerobic Sludge Blanket (UASB) Reactor

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 512
Author(s):  
Jeremiah Chimhundi ◽  
Carla Hörstmann ◽  
Evans M. N. Chirwa ◽  
Hendrik G. Brink
Keyword(s):  
Treatment Process ◽  
Removal Rate ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Reduction Potentials ◽  
Oxidation Reduction ◽  
Anaerobic Sludge Blanket ◽  
Microbial Removal ◽  
Maximum Removal

The main objective of this study was to achieve the continuous biorecovery and bioreduction of Pb(II) using an industrially obtained consortia as a biocatalyst. An upflow anaerobic sludge blanket reactor was used in the treatment process. The bioremediation technique that was applied made use of a yeast extract as the microbial substrate and Pb(NO3)2 as the source of Pb(II). The UASB reactor exhibited removal efficiencies of between 90 and 100% for the inlet Pb concentrations from 80 to 2000 ppm and a maximum removal rate of 1948.4 mg/(L·d) was measured. XRD and XPS analyses of the precipitate revealed the presence of Pb0, PbO, PbS and PbSO4. Supporting experimental work carried out included growth measurements, pH, oxidation–reduction potentials and nitrate levels.

Denitrification on the top of UASB reactors of rice wastewaters

2001 ◽  
Vol 44 (4) ◽  
pp. 79-82 ◽  
Author(s):  
L. F. Lopes ◽  
P. R. Koetz ◽  
M. S. Santos
Keyword(s):  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Food Industries ◽  
Denitrification Reactor ◽  
Mixed Reactor ◽  
South Of Brazil ◽  
Anaerobic Sludge Blanket ◽  
Uasb Reactors ◽  
Maximum Removal

Parboiled rice industry is one of main food industries in the south of Brazil. The main parts of the processing are the humidification and gelatinization of the grain. This procedure increases the productivity and nutritive and cooking values of the product. Some of these industries in the region utilize upflow anaerobic sludge blanket (UASB) reactors as a biological treatment for carbon removal. For nitrogen removal, the proposed system aims to eliminate an extra denitrification reactor, making this step in the top of the UASB, an anoxic zone of the reactor. Nitrification was performed in aerated mixed reactor of 3,6 L. A fraction of the NR was recycled in the top of UASB reactor above the sludge blanket. Recycled ratio varied from 0; 1:0.5; 1:1.0; to 1:1.5. The maximum removal efficiency of NTK was 80%. The results confirm the viability of the proposed system for denitrification.

Treatment of slaughterhouse wastewater in upflow anaerobic sludge blanket reactor

2011 ◽  
Vol 63 (5) ◽  
pp. 877-884 ◽  
Author(s):  
P. Mijalova Nacheva ◽  
M. Reyes Pantoja ◽  
E. A. Lomelí Serrano
Keyword(s):  
Volatile Fatty Acids ◽  
Removal Rate ◽  
Additional Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Organic Load ◽  
Anaerobic Sludge ◽  
Yield Coefficient ◽  
Slaughterhouse Wastewater ◽  
Anaerobic Sludge Blanket

The performance of an upflow anaerobic sludge blanket (UASB) reactor operated at ambient temperature (20.9–25.2°C) was analysed for the treatment of slaughterhouse wastewater previously pre-treated for solid separation. The experimental work was carried out in a reactor with 15 L effective volume. Four organic loads were applied and the process performance was evaluated. The COD removal rate increased with the load rise from 4 to 15 kg COD.m−3.d−1. Removal efficiencies of 90% were obtained with a load of 15 kg COD.m−3.d−1. The entrapment of suspended solids in the sludge blanket was greater in proportion during the first two stages due to the low upflow velocities used when loads of 4 and 7 kg COD.m−3.d−1 were evaluated. This phenomenon did not affect the structure of the biological grains or their methanogenic activity. More than 50% of the organic nitrogen was degraded, causing a 3% increase of ammonia concentration. The concentrations of the volatile fatty acids were not high and the wastewater alkalinity was enough to prevent acidification. The yield coefficient of methane production increased with the load rise, reaching 0.266 m3/kg CODremoved at 15 kg COD.m−3.d−1 organic load. The UASB reactor is a good option for the biological treatment of pre-treated slaughterhouse wastewater. However, additional treatment is required in order to accomplish the water quality requirements in discharges to water bodies.

Optimal process pattern for simultaneous sulfur, nitrogen and carbon removal

2009 ◽  
Vol 59 (4) ◽  
pp. 833-837 ◽  
Author(s):  
Chuan Chen ◽  
Aijie Wang ◽  
Nanqi Ren ◽  
Xuliang Deng ◽  
Duu-Jong Lee
Keyword(s):  
Elemental Sulfur ◽  
Removal Rate ◽  
Granular Sludge ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Loading Rates ◽  
Process Pattern ◽  
High Removal Rate ◽  
Anaerobic Sludge Blanket

Denitrifying sulfide removal (DSR) process incorporates interactions between autotrophic and heterotrophic denitrifiers and reveals difficulty to achieve high removal rate of nitrogen and sulfur in practice. We compared the DSR performance of an expanded granular sludge bed (EGSB) reactor and an upflow anaerobic sludge blanket (UASB) reactor, both fed with wastewaters comprising sulfide, nitrate and acetate. The EGSB reactor can sustain at higher loading rates than UASB reactor, probably owing to the less elemental sulfur production rate for the latter in operation.

scholarly journals Microbial Kinetic Analysis of a Hybrid UASB Reactor

2020 ◽  
Keyword(s):  
Removal Rate ◽  
Second Order ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Hybrid Reactor ◽  
Anaerobic Sludge ◽  
Microbial Kinetics ◽  
Substrate Removal ◽  
Anaerobic Sludge Blanket ◽  
Kinetics Of

<p>Microbial kinetics of a hybrid upflow anaerobic sludge blanket (UASB) reactor were investigated when treating chemical synthesis–based pharmaceutical wastewater. Monod, Grau first-order, Grau second-order, Stover-Kincannon, Chen &amp; Hashimoto kinetic models were applied to the hybrid reactor. The second-order model was found to be the most appropriate model for the hybrid reactor (R2 = 0.99) and offers the best description of the process. The substrate removal rate constant (k2S) was found to be 4.91 d-1.</p>

scholarly journals Treatment of canned fish factory wastewater by upflow anaerobic sludge blanket (uasb) reactors

2015 ◽  
Vol 5 (1) ◽  
pp. 158
Author(s):  
Farshad Golbabaei Kootenaei ◽  
Gholamreza Darvishi ◽  
Mohammad Javad Bayani
Keyword(s):  
Removal Rate ◽  
Anaerobic Treatment ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Organic Loading Rate ◽  
Anaerobic Sludge ◽  
Canned Fish ◽  
Cod Removal Rate ◽  
Aeration Process ◽  
Anaerobic Sludge Blanket

<p>Application of UASB method for wastewater treatment of canned fish factory reduces the costs of pre-treatments processes such as neutralization, and also reduced the costs of final aeration process. In this study, an UASB reactor which was equipped with a 3-phase separator system has been used. At first, a complex of anaerobic digester sludge and return sludge of activated sludge was added to reactor with ratio of 25 to 15. Then, the wastewater of factory entered into the reactor with inlet Organic Loading Rate (OLR) of 0.5 kg/m3.day which was increased gradually up to 4 kg/m3.day. Then, sampling was done for various tests during 75 days. The results of this study showed that UASB method neutralized and reduced the pH of the inlet wastewater from 10.5 to 7.3; and also reduced the SS of the inlet wastewater from 43 gr/l to 8 gr/l. the COD removal rate of this method was around 87%.</p><p>Keywords: canned fish wastewater, anaerobic treatment, UASB, COD, OLR.</p>

KINETIC MODELS FOR PREDICTION OF COD EFFLUENT FROM UPFLOW ANAEROBIC SLUDGE BLANKET (UASB) REACTOR FOR CANNERY SEAFOOD WASTEWATER TREATMENT

2016 ◽  
Vol 78 (5-6) ◽  
Author(s):  
Sunwanee Jijai ◽  
Chairat Siripatana ◽  
Sompong O-Thong ◽  
Norli Ismail
Keyword(s):  
Palm Oil ◽  
Kinetic Models ◽  
Second Order ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Substrate Removal ◽  
Reactor Kinetic ◽  
Palm Oil Mill ◽  
Anaerobic Sludge Blanket

The three identical lab-scale upflow anaerobic sludge blanket (UASB) reactors were operated continuously for treating cannery seafood wastewater at seven hydraulic retention times (HRTs) of 5, 4, 3, 2, 1, 0.5 and 0.25 days. The different of granule sizes from three sources: a cassava factory (CS), a seafood factory (SS), and a palm oil mill (PS), average sizes in the range 1.5-1.7, 0.7-1.0 and 0.1-0.2 mm respectively were used as inocula for anaerobic digestion. The UASB-R1 used only granules from seafood factory (R1-SS), the UASB-R2 used mixed granules from seafood with cassava factory (R2-SS+CS) and the UASB-R3 used mixed granules from seafood factory with palm oil mill (R3-SS+PS). In this study selected mathematical models including Monod, Contois, Grau second-order and modified Stover-Kicannon kinetic models were applied to determine the substrate removal kinetics of UASB reactor. Kinetic parameters were determined through linear regression using experimental data obtained from the steady-state experiment and subsequently used to predict effluent COD. The results showed that Grau second-order and modified Stover-Kicannon kinetic models were more suitable than that of others for predicting the effluent COD, with high the correlation coefficient (R2). In addition, the UASB-R2 from mixed granules with cassava factory (SS+CS) gave the best performance and highest coefficient value.

Treatment of raw sewage in a temperate climate using a UASB reactor and the hanging sponge cubes process

1997 ◽  
Vol 36 (6-7) ◽  
pp. 433-440 ◽  
Author(s):  
Lalit K. Agrawal ◽  
Yasuhiro Ohashi ◽  
Etsuo Mochida ◽  
Hiroyuki Okui ◽  
Yasuko Ueki ◽  
...  
Keyword(s):  
Ammonia Oxidation ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Temperate Climate ◽  
Anaerobic Sludge ◽  
Treatment Efficiency ◽  
Oxidation Rates ◽  
Air Intake ◽  
Anaerobic Sludge Blanket ◽  
Digested Sewage Sludge

The treatability of raw sewage in a temperate climate (wintertime around 10–20°C) using an upflow anaerobic sludge blanket (UASB) reactor and the hanging sponge cubes process was evaluated. After being seeded with digested sewage sludge, a 47.1 L UASB reactor was continuously operated for more than 2 years by feeding raw sewage, which had average COD around 300 mg/L (41% soluble). During summertime at an HRT of 7 h, effluent COD approximately 70 mg/L total, 50 mg/L soluble and BOD5 20 mg/L total, 12 mg/L soluble was obtained. During wintertime also, treatment efficiency and process stability was good. With the hanging sponge cubes process using the effluent of the UASB reactor treating raw sewage, the following results were obtained. The ammonia oxidation rates of 1.9 and 3.5 g NH4-N·m−2·d−1 in a downflow hanging sponge cubes biofilter, under natural air intake only were obtained during wintertime and summertime, respectively. With post-denitrification and an external carbon source, 84% in average N (NO3+NO2) was removed with an HRT of less than 1 hour and in the temperature range of 13 to 30°C using an upflow submerged hanging sponge bed bioreactor, under anaerobic conditions. The overall system using a UASB reactor and the hanging sponge cubes process could be quite an attractive treatment alternative.

scholarly journals Organic Matter Removal in a Simultaneous Nitrification-Denitrification Process Using Fixed-Film System.

2021 ◽  
Author(s):  
Perla Gonzalez ◽  
Ana Aguilar Ruiz ◽  
Andrea Reynosa Varela ◽  
Ulises Durán Hinojosa ◽  
Marco Garzón Zuñiga ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nitrogen Compound ◽  
Upflow Anaerobic Sludge Blanket ◽  
Swine Wastewater ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Organic Matter Removal ◽  
Fixed Film ◽  
Suspended Biomass ◽  
Anaerobic Sludge Blanket

Abstract This study focused on evaluating different support media for COD and nitrogen compound removal from an Upflow Anaerobic Sludge Blanket (UASB) reactor fed with swine wastewater. Maximum specific nitrification (MSNA) and denitrification (MSDA) activity tests were performed in two fixed-film systems with (1) polyurethane foam (R1) and (2) polyethylene rings (R2). The results showed that the R2 system performed more efficiently than R1, reaching organic matter removal of 77 ± 8% and nitrogen of 98 ± 4%, attributed to higher specific denitrifying activity recorded (5.3 ± 0.34 g NO3--N/g VTS ∙h). In this sense, MSDA tests indicated that the suspended biomass was responsible for at least 70% of nitrogen removal in the form of ammonium compared with 20% attributed to biomass in the form of biofilm. On the other hand, 40 ± 5% of initial nitrogen could not be quantified in the system effluents, but 10 ± 1% was attributed to loss by volatilization. According to the analyses, the previous information infers the development of simultaneous nitrification-denitrification (SND) routes. Respect to the analyses of microbial diversity and abundance in the biofilm of R2 rings, the presence of the genus Pseudomonas dominated the prokaryotic community of the system in 54.4%.

Sign in / Sign up

Export Citation Format

Share Document