Biosurfactant production by Pseudomonas aeruginosa SP4 using sequencing batch reactors: Effects of oil loading rate and cycle time

2009 ◽  
Vol 100 (2) ◽  
pp. 812-818 ◽  
Author(s):  
Orathai Pornsunthorntawee ◽  
Sasiwan Maksung ◽  
Onsiri Huayyai ◽  
Ratana Rujiravanit ◽  
Sumaeth Chavadej
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Cycle Time ◽  
Loading Rate ◽  
Biosurfactant Production ◽  
Batch Reactors ◽  
Sequencing Batch Reactors

Biosurfactant production by Pseudomonas aeruginosa SP4 using sequencing batch reactors: Effect of oil-to-glucose ratio

2010 ◽  
Vol 49 (2) ◽  
pp. 185-191 ◽  
Author(s):  
Sira Pansiripat ◽  
Orathai Pornsunthorntawee ◽  
Ratana Rujiravanit ◽  
Boonyarach Kitiyanan ◽  
Pastra Somboonthanate ◽  
...  
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Biosurfactant Production ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Glucose Ratio

Post Treatment of Anaerobic Effluent Using Sequencing Batch Reactors

1989 ◽  
Vol 21 (4-5) ◽  
pp. 23-28
Author(s):  
Kean Kee Chin
Keyword(s):  
Suspended Solids ◽  
Loading Rate ◽  
Operating Conditions ◽  
Oil Refinery ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Anaerobic Reactors ◽  
Field Unit ◽  
Solids Removal ◽  
Oil Refinery Wastewater

A 150ℓ field unit and two 7.5ℓ laboratory scale sequencing batch reactors (SBRs) were used to polish edible oil refinery wastewater pretreated by attached film anaerobic reactors. SBRs performed well with respect to COD and suspended solids removal. At a loading rate of less than 2 kg COD/m3-d more than 90% COD removal efficiency was achieved. Solids settling was good with SVI generally less than 160. The system showed stability under large variations of organic loading and operating conditions. A significant amount of COD was removed during the long filling and anoxic period.

Biological treatment of pharmaceutical wastewater from the antibiotics industry

2013 ◽  
Vol 69 (4) ◽  
pp. 855-861 ◽  
Author(s):  
O. Lefebvre ◽  
X. Shi ◽  
C. H. Wu ◽  
H. Y. Ng
Keyword(s):  
Loading Rate ◽  
Oxygen Demand ◽  
Organic Loading Rate ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Pharmaceutical Wastewater ◽  
Refractory Compounds ◽  
Treated Effluent ◽  
Discharge Regulation ◽  
Pre Treatment

Pharmaceutical wastewater generated by an antibiotics (penicillin) company was treated by aerobic membrane bioreactors (MBRs) and sequencing batch reactors (SBRs). At a low organic loading rate of 0.22 kg-COD m−3d−1, both types of reactors were capable of treating the wastewater such that the treated effluent met the discharge regulation except for the total dissolved solids. However, when the loading rate was increased to 2.92 kg-COD m−3d−1, foaming issues resulted in unstable performance. Overall, the MBRs achieved better solid removal but the SBRs performed better in regards to the degradation of aromatic compounds, as determined by UV absorbance (UVA). Finally, ozonation was applied on two different streams and showed promise on the strong stream – that corresponds to the formulation effluent and contains most of the biorefractory compounds. Ozonation successfully reduced the UVA, lowered the pH and increased the biochemical oxygen demand : chemical oxygen demand (BOD5 : COD) ratio of the strong stream. However, it was less efficient on the effluent having undergone pre-treatment by a biofilter due to a lack of selectivity towards refractory compounds.

Biological ammonia removal from anaerobically pre-treated landfill leachate in sequencing batch reactors (SBR)

2001 ◽  
Vol 43 (3) ◽  
pp. 307-314 ◽  
Author(s):  
G. Yalmaz ◽  
I. Öztürk
Keyword(s):  
Carbon Source ◽  
Landfill Leachate ◽  
Cycle Time ◽  
Biomass Concentration ◽  
Ammonia Removal ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
The Third ◽  
External Carbon Source ◽  
The Difference

The aim of the study was to investigate both the use of the SBR technology in biological ammonia removal from landfill leachate, and the suitability of raw landfill leachate as external carbon source in denitrification step. The SBR was fed with diluted leachate for the first 42 days and then the effluent of UASBR was used as the feed. The SBR was operated intermittently with a cycle time of 24 hours. The effluent NH4+-N values of less than 5 mg NH4+-N L-1 was consistently observed for the initial NH4+-N levels of as high as 1000 mg NH4+-N L-1. The nitrification rates for the first, second and third stages were found as 5.7, 46.8 and 102.8 mg NH4+-N L-1 h-1, respectively. The difference of the nitrification rates in the 2nd and 3rd stages originated from increasing adaptation of the sludge as well as increasing biomass concentration (10.5 mg NH4+-N g-1VSS h-1). No significant accumulation of NO2--N has been observed during the study and NO2--N/NOx--N ratios measured in the 1st aerobic phase and the SBR effluent were less than 7%. The denitrification rates for the second (raw leachate as carbon source) and the third (Ca(CH3COO)2 as carbon source) stages were determined as 45.7 mg NOx--N L-1 h-1 (or 9.85 mg NOx--N g-1VSS h-1) and 125.7 mg NOx--N L-1 h-1 (or 12.88 mg NOx--N g-1VSS h1), respectively.

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