Activated-sludge process dynamics with continuous total organic carbon and oxygen uptake measurements

1979 ◽  
Vol 21 (9) ◽  
pp. 1561-1577 ◽  
Author(s):  
R. Mona ◽  
I. J. Dunn ◽  
J. R. Bourne
Keyword(s):  
Organic Carbon ◽  
Oxygen Uptake ◽  
Activated Sludge ◽  
Total Organic Carbon ◽  
Activated Sludge Process ◽  
Process Dynamics

Modeling the impact of membrane filtration on organic carbon removal by the activated sludge process for tannery wastewater

2021 ◽  
Vol 215 ◽  
pp. 405-413
Author(s):  
Seval Sözen ◽  
A. Begüm Yücel ◽  
Güçlü İnsel ◽  
Derin Orhon
Keyword(s):  
Organic Carbon ◽  
Activated Sludge ◽  
Membrane Filtration ◽  
Tannery Wastewater ◽  
Activated Sludge Process ◽  
Carbon Removal ◽  
The Impact

FLUORESCENCE MONITORING OF AN ALTERNATING ACTIVATED SLUDGE PROCESS

1994 ◽  
Vol 30 (4) ◽  
pp. 229-238 ◽  
Author(s):  
S. Isaacs ◽  
M. Henze
Keyword(s):  
Oxygen Uptake ◽  
Activated Sludge ◽  
Nutrient Removal ◽  
Oxygen Uptake Rate ◽  
Peak Oxygen Uptake ◽  
Activated Sludge Process ◽  
Anaerobic Conditions ◽  
Mode Of Operation ◽  
Operation Cycle ◽  
Abrupt Rise

The fluoresence of a nitrification/denitrification tank in an activated sludge nutrient removal process was monitored over a two month period. The process employs an alternating mode of operation which subjects the sludge to a periodically changing environment (aerobic, anoxic and anaerobic) at the point in the process where the fluoresence is measured. The fluoresence signal decreased slowly during aerated periods and increased slowly during anoxic (denitrifying) periods. An abrupt rise in the fluoresence signal was found to occur upon the transition from anoxic to anaerobic conditions. The minimum fluoresence signal occurring during each operation cycle appeared to define a baseline whose general upward and downward movements correlated well with peak oxygen uptake rate.

Controlling organic carbon removal of a highly-loaded activated sludge process

2016 ◽  
Vol 2016 (14) ◽  
pp. 3613-3618
Author(s):  
Mark W Miller ◽  
Jose Jimenez ◽  
Sudhir Murthy ◽  
Bernhard Wett ◽  
Charles B Bott
Keyword(s):  
Organic Carbon ◽  
Activated Sludge ◽  
Activated Sludge Process ◽  
Carbon Removal ◽  
Highly Loaded

Specific oxygen uptake, nitrification and denitrification rates of a zinc-added anoxic/oxic activated sludge process

1998 ◽  
Vol 38 (1) ◽  
pp. 133-139 ◽  
Author(s):  
T. Panswad ◽  
P. Polprucksa
Keyword(s):  
Oxygen Uptake ◽  
Activated Sludge ◽  
Zinc Concentration ◽  
Initial Conditions ◽  
Oxygen Uptake Rate ◽  
Nitrification Rate ◽  
Activated Sludge Process ◽  
Specific Oxygen Uptake Rate ◽  
Different Characteristics ◽  
The Impact

The specific oxygen uptake rate (SOUR), specific nitrification rate (SNR) and specific denitrification rate (SDNR) of an anoxic-oxic activated sludge process fed with zinc-added synthetic wastewaters were investigated. Two different characteristics of synthetic wastewaters were used, i.e., 500 mg/l COD, 40 mg/l TKN and 10 mg/l P (representing normal COD load) for Model A while 3500 mg/l COD, 175 mg/l TKN and 25 mg/l P (representing high COD load) for Model B. The zinc doses varied from 0 (control) to 10, 25, 35 and 50 mg/l. When the two systems reached steady states, they were further shocked with 300 mg/l zinc for 4 consecutive days before returning to their initial conditions. The SRT and F/M ratio of both models were 10 days and 0.26-0.47 day−1, respectively. The endogenous SOURs of both models were not much affected by the increase of zinc concentration. They were about 7.5 to 10 and 9.4 to 11.5 mg O2/g MLSS-hr, for Models A and B, respectively. In Model A, as the zinc increased from 0 to 50 mg/l, the SNRs dropped from 4.0 to 1.4 mg NH4+-N /g MLSS-hr whereas the initial SDNRs fell from 19.6 to 5.3 mg NO3− /g MLSS-hr. Meanwhile, the SNRs of Model B were relatively constant (1.5-1.8 mg NH4+-N /g MLSS-hr) while the initial SDNRs dropped from 16.2 to 8.3 mg NO3− /g MLSS-hr. That is, under high COD load conditions, the zinc dose applied here did not significantly affect the carbon removing heterotrophs and nitrifiers while a slight effect was seen on the denitrifiers and significant retardation was observed for both nitrifiers and denitrifiers in case of normal COD load. During the shock period, the SNRs of Model A dropped to 0.67 to 1.26 mg NH4+-N /g MLSS-hr whereas the initial SDNRs decreased drastically to 1.5 to 3.0 mg NO3− /g MLSS-hr. The impact from the zinc shock in such circumstances was obviously higher on the denitrifiers than on the nitrifiers. In Model B, the SNRs were 0.77 to 1.5 mg NH4+-N /g MLSS-hr and the initial SDNRs were 2.9 to 6.18 mg NO3− /g MLSS-hr. Not much effect on nitrifiers was evident in this case. For Model A, the recoverability of the heterotrophs and the nitrifiers was not so good, while that of the denitrifiers was quite satisfactory. However for Model B, those recuperation abilities were comparable for all three organisms. The data therefore suggested that there may be some differences in the species domain between the carbon removing microorganisms and the denitrifiers, however, further investigations for confirmation are required.

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