Influence of operating conditions on sulfate reduction from real mining process water by membrane biofilm reactors

Chemosphere ◽  
2020 ◽  
Vol 244 ◽  
pp. 125508 ◽  
Author(s):  
José Ignacio Suárez ◽  
Marcelo Aybar ◽  
Iván Nancucheo ◽  
Benjamín Poch ◽  
Patricio Martínez ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Operating Conditions ◽  
Process Water ◽  
Biofilm Reactors

Cometabolism in biofilm reactors

1995 ◽  
Vol 31 (1) ◽  
pp. 215-225 ◽  
Author(s):  
Gerald E. Speitel ◽  
Robert L. Segar
Keyword(s):  
Chlorinated Solvents ◽  
Packed Bed ◽  
Operating Conditions ◽  
Mixed Cultures ◽  
Treatment Technology ◽  
Hydraulic Residence Time ◽  
Slow Growth Rate ◽  
Biofilm Reactors ◽  
Aerobic Cometabolism ◽  
Degrading Bacteria

Aerobic cometabolism of chlorinated aliphatic solvents in biofilm reactors is a potential treatment technology for contaminated water and air streams. This research investigated cometabolism by pure and mixed cultures of methanotrophs and mixed cultures of phenol-degrading bacteria. Initial experiments with continuous-flow, packed-bed bioreactors proved unsuccessful; therefore, the major focus of the work was on sequencing biofilm reactors, which cycle between two modes of operation, degradation of chlorinated solvents and rejuvenation of the microbial population. Particular success was obtained with a mixed culture of phenol degraders in the treatment of chlorinated ethenes (e.g., trichloroethylene - TCE). Under the best operating conditions, 90% removal of TCE occurred at a 14-minute packed-bed hydraulic residence time. The bioreactors required only two, 1.5 h biomass rejuvenation periods per day to sustain this removal. Experiments with Methylosinus trichosporium OB3b were less successful because of the organism's slow growth rate, relatively poor ability to attach to surfaces, and its inability to successfully compete with other methanotrophs in the bioreactor environment. Overall, however, the research demonstrated the potential attractiveness of sequencing biofilm reactors in treating water contaminated with chlorinated solvents.

Sulfate Reduction for Inorganic Waste and Process Water Treatment

2011 ◽  
pp. 435-446 ◽  
Author(s):  
M.F.M. Bijmans ◽  
C.J.N. Buisman ◽  
R.J.W. Meulepas ◽  
P.N.L. Lens
Keyword(s):  
Water Treatment ◽  
Sulfate Reduction ◽  
Process Water ◽  
Inorganic Waste

Sulfate Reduction for Inorganic Waste and Process Water Treatment

2011 ◽  
pp. 384-395
Author(s):  
M.F.M. Bijmans ◽  
C.J.N. Buisman ◽  
R.J.W. Meulepas ◽  
P.N.L. Lens
Keyword(s):  
Water Treatment ◽  
Sulfate Reduction ◽  
Process Water ◽  
Inorganic Waste

Treatment of Slaughterhouse Wastewater Using Fluidized Bed Biofilm Reactors

1987 ◽  
Vol 19 (1-2) ◽  
pp. 1-10 ◽  
Author(s):  
Chun T. Li ◽  
Wen K. Shieh ◽  
Chun S. Wu ◽  
Ju S. Huang
Keyword(s):  
Fluidized Bed ◽  
Cost Effective ◽  
Maximum Amount ◽  
Biofilm Reactor ◽  
Operating Conditions ◽  
High Concentration ◽  
Slaughterhouse Wastewater ◽  
Chemical Coagulation ◽  
Biofilm Reactors ◽  
Cost Effective Alternative

The oxygenic fluidized bed biofilm reactor(FBBR) was evaluated in a laboratory investigation for treatment of pig slaughtering wastewater (slaughterhouse wastewater). Because the slaughterhouse wastewater contains a high concentration of grease, chemical coagulation/flocculation was adopted as the pretreatment step prior to FBBR treatment. The performance of the FBBR was evaluated at BOD loadings of between 8.5 to 98.5 kg/m3-day, hydraulic retention times of between 8.8 to 30.8 minutes, recirculation ratios of between 1 to 6, and feed BOD concentrations of between 305 to 602 mg/L. Under these operating conditions, removal efficiencies of BOD, grease, and NH3-N were in the range of 71 to 94%, 29 to 84%, and 20 to 73%, respectively. Both BOD and grease of the slaughterhouse wastewater used could be lowered to 40 and 10 mg/L, respectively, at a BOD loading of 20 kg/m3-day in order to meet effluent requirements to be enforced in Taiwan in 1990. Because the maximum amount of oxygen that could be dissolved in the oxygenation device used in this investigation was 40 mg/L, the FBBR would become anaerobic when the BOD loading applied exceeded 50 kg/m3-day. Relatively constant biomass holdups (10,000 mg TVS/L) could be maintained in FBBRs over the BOD loadings applied via the practice of regular biofilm separation and biomass wasting. The combined chemical coagulation/flocculation-FBBR process provides a feasible and cost-effective alternative for treatment of slaughterhouse wastewater.

scholarly journals Theoretical and Practical Aspects of Biological Sulfate Reduction: A Review

2019 ◽  
Keyword(s):  
Sulfate Reduction ◽  
Life Forms ◽  
Operating Conditions ◽  
Community Formation ◽  
Operational Cost ◽  
Efficient Treatment ◽  
Physicochemical Processes ◽  
Overall Performance ◽  
And Performance ◽  
Biological Sulfate Reduction

<p>The major environmental impact of discharge of excessive quantities of sulfate is the pollution of the surface and ground water supplies which can be harmful to life forms and therefore the need for an efficient treatment system arises. Biological sulfate reduction offers the advantage of less sludge production, less operational cost and efficiency in comparison to the physicochemical processes. Depending upon the feeding and operating conditions as well as microbes used, a number of intermediates are formed that may greatly affect the overall performance of bioreactor. This article extensively explores the bacterial community, formation of intermediates and desirable end products, theoretical and practical aspects of various environmental and operating conditions, and performance of bioreactors used for treating sulfate rich wastewater along with process biokinetics involved in biological sulfate reduction.</p>

Evaluation of operating conditions on sulfate reduction from acidic wastewater in a fixed-bed bioreactor

2022 ◽  
Vol 177 ◽  
pp. 107370
Author(s):  
Pedro Hernández ◽  
Gonzalo Recio ◽  
Christian Canales ◽  
Alex Schwarz ◽  
Denys Villa-Gomez ◽  
...  
Keyword(s):  
Sulfate Reduction ◽  
Fixed Bed ◽  
Operating Conditions ◽  
Fixed Bed Bioreactor ◽  
Acidic Wastewater

Thermophilic Anaerobic Treatment of Sulfate-Rich Pulp and Paper Integrate Process Water

1991 ◽  
Vol 24 (3-4) ◽  
pp. 149-160 ◽  
Author(s):  
J. Rintala ◽  
J. L. Sanz Martin ◽  
G. Lettinga
Keyword(s):  
Sulfate Reduction ◽  
Removal Efficiency ◽  
Anaerobic Treatment ◽  
Cod Removal ◽  
Process Water ◽  
Upflow Anaerobic Sludge Blanket ◽  
Uasb Reactor ◽  
Anaerobic Sludge ◽  
Cod Removal Efficiency ◽  
Uasb Reactors

Anaerobic treatment of sulfate - rich (COD/SO4 ratio 1.4-2.1) clarified Whitewater from a thermomechanical pulping (TMP) process was studied in three laboratory-scale upflow anaerobic sludge blanket (UASB) reactors at 55°C and in batch digesters at 55° and 65°C. Different seed materials were used in the UASB reactors. The highest COD removal efficiency (effluent sulfide stripped) achieved was approximately 65 % in the UASB reactors. About 55 % COD removal efficiency was obtained at a loading rate of about 41 kgCODm−3d−1 in the UASB reactor seeded with thermophilic sludge cultivated with volatile fatty acids (VFAs). The total sulfide present in the liquid phase after anaerobic treatment accounted for approximately 65-78 % and 15-61 % of the removed COD in the batch digesters and the UASB reactors, respectively. Sulfate reduction was almost complete in the batch digesters, whereas about 24-64 % of sulfate was reduced in the UASB reactors. Acetate utilization for sulfate reduction was apparent in the batch digesters, whereas that could not be demonstrated in the UASB reactors. Sulfate reduction in the UASB reactors was obviously substrate limited. In conclusion, thermophilic anaerobic treatment is an alternative for the treatment of warm sulfate rich TMP process water.

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