Persistent organic pollutants (POPs) in the conventional activated sludge treatment process: Model predictions against experimental values

Chemosphere ◽  
2006 ◽  
Vol 65 (9) ◽  
pp. 1634-1641 ◽  
Author(s):  
Athanasios Katsoyiannis ◽  
Anastasios Zouboulis ◽  
Constantini Samara
Keyword(s):  
Activated Sludge ◽  
Organic Pollutants ◽  
Persistent Organic Pollutants ◽  
Process Model ◽  
Treatment Process ◽  
Sludge Treatment ◽  
Conventional Activated Sludge ◽  
Model Predictions ◽  
Experimental Values

The fate of lindane in the conventional activated sludge treatment process

Chemosphere ◽  
2004 ◽  
Vol 55 (1) ◽  
pp. 81-91 ◽  
Author(s):  
A.M. Kipopoulou ◽  
A. Zouboulis ◽  
C. Samara ◽  
Th. Kouimtzis
Keyword(s):  
Activated Sludge ◽  
Treatment Process ◽  
Sludge Treatment ◽  
Conventional Activated Sludge

Activated Sludge Treatment of Ethoxylate Surfactants at High Industrial Use Concentrations

1988 ◽  
Vol 20 (11-12) ◽  
pp. 125-130 ◽  
Author(s):  
J. P. Salanitro ◽  
G. C. Langston ◽  
P. B. Dorn ◽  
L. Kravetz
Keyword(s):  
Activated Sludge ◽  
Fathead Minnow ◽  
Treatment Process ◽  
Aquatic Toxicity ◽  
Alcohol Ethoxylate ◽  
Sludge Treatment ◽  
Nonylphenol Ethoxylate ◽  
Incomplete Removal ◽  
Industrial Use ◽  
Bod Removal

The primary degradation of a linear alcohol ethoxylate (AE) and a branched nonylphenol ethoxylate (NPE) was investigated in bench-scale activated sludge units treating a synthetic sewage feed. Biotreaters were gradually adapted to 10-100 mg/ℓ surfactant and effluents monitored for loss of nonionic ethoxylate, foaming, feed BOD removal, nitrification and biosolids growth. Both surfactants were degraded at influent doses of 10-40 mg/ℓ. Substantial BOD breakthrough, loss of nitrification, aerator foaming and incomplete removal of the NPE surfactant occurred when fed at 80 and 100 mg/ℓ while the unit treating AE was unaffected by high surfactant levels. Comparative aquatic toxicity of the biotreated waste at high surfactant levels indicated that the NPE effluent was acutely toxic (EC50, 7-15% effluent) to the fathead minnow and Daphnia while that of the AE unit was non-toxic (EC50, > 100% effluent) to these same species. These studies indicate that the treatment of wastes containing high levels of NPE ethoxylates may adversely impact an activated sludge process in incomplete degradation and foaming, impaired BOD removal, loss in nitrification and the formation of toxic effluents. AE surfactants, however, undergo extensive microbial degradation and cause little or no impact on the activated sludge treatment process.

Control of activated sludge treatment process using pre-compensated multi-variable quantitative feedback theory-based controller

2021 ◽  
pp. 014233122110390
Author(s):  
Sandipan Prasad Chakravarty ◽  
Aniket Roy ◽  
Prasanta Roy
Keyword(s):  
Activated Sludge ◽  
Treatment Process ◽  
Waste Water Treatment ◽  
Measurement Data ◽  
Treatment Plant ◽  
Ammonium Ion ◽  
Waste Water Treatment Plant ◽  
Quantitative Feedback Theory ◽  
Sludge Treatment ◽  
Control Scheme

This paper deals with the design of a pre-compensated multi-variable quantitative feedback theory (QFT)-based fully populated matrix controller for an activated sludge treatment process (ASTP) of a waste water treatment plant (WWTP). The regulation of the concentration of biochemical oxygen demand ([Formula: see text]) and ammonium-ion ([Formula: see text]) is the control objective. The plant dynamics are obtained using physical laws available in the literature. The parametric uncertainty is quantified from the measurement data obtained from a real ASTP of an oil refinery. The model is duly cross-validated. A novel technique is proposed to design a pre-compensator that will enhance the diagonal dominance of the plant transfer function matrix. A diagonal controller and a pre-filter, are then designed using a sequential multi-input multi-output (MIMO) QFT-based methodology to meet a set of performance specifications such as relative stability, disturbance rejection, robust tracking and so forth. The simulation results validate the effectiveness of the proposed control scheme. A comparative analysis with reported works shows that the proposed control scheme outperforms some of the reported control strategies.

scholarly journals Estimating the impact of inhibitory substances on activated sludge denitrification process

2019 ◽  
Vol 14 (4) ◽  
pp. 863-871 ◽  
Author(s):  
Kati Klein ◽  
Taavo Tenno
Keyword(s):  
Standard Deviation ◽  
Oxygen Uptake ◽  
Activated Sludge ◽  
Process Efficiency ◽  
Sludge Treatment ◽  
Conventional Activated Sludge ◽  
Uptake Rates ◽  
Relative Standard ◽  
The Impact ◽  
Denitrification Process

Abstract Industrial wastewater frequently contains substances which inhibit activated sludge treatment processes. Inhibitory characteristics of different substances are usually evaluated based on testing the impact of respective substance on activated sludge nitrification or oxygen uptake rates. However, denitrification is always before aerobic processes in conventional activated sludge treatment plants and thereby more exposed to inhibitory compounds. There is no easily applicable and validated method available for determination of denitrification process efficiency and inhibition. In this study, a method for evaluation of inhibition on the activated sludge denitrification process was developed and validated using 3,5-dichlorophenol (3,5-DCP) as a model inhibitory compound and additionally controlled with real wastewater produced in the shale oil industry. Average IC50 value (5.5 ± 2.2 mg L−1) for 3,5-DCP showed that denitrifiers were less sensitive than nitrifiers (IC50 = 2.9 ± 0.7 mg L−1) and more sensitive than aerobic heterotrophs (IC50 = 7.2 ± 2.4 mg L−1). Methodological aspects like accumulation of nitrite nitrogen, acclimatization of biomass and technical issues were discussed. Achieved validation characteristics were similar with ISO Standards estimating activated sludge nitrification and oxygen uptake rates, which proves the reliability of the method: standard deviation, 95.4% confidence level, relative standard deviation were calculated to be 2.2 mg L−1, 1.2 … 9.8 mg L−1 and 39.2%, respectively.

Molecular Weight Distributions of Soluble Organic Matter in Various Secondary and Tertiary Effluents

1987 ◽  
Vol 19 (3-4) ◽  
pp. 529-538 ◽  
Author(s):  
Gary L. Amy ◽  
Curtis W. Bryant ◽  
Mosen Belyani
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Activated Sludge ◽  
Water Reuse ◽  
Treatment Process ◽  
Apparent Molecular Weight ◽  
Pure Oxygen ◽  
Soluble Organic Matter ◽  
Conventional Activated Sludge ◽  
Absorbing Material

Differences in the nature of soluble organic matter were measured for various full-scale wastewater treatment processes. Conventional activated sludge, pure oxygen activated sludge, biofiltration, granular activated carbon, and tertiary sand filtration were evaluated. Effluent soluble organic matter was analyzed by ultrafiltration for the apparent molecular weight distribution of soluble organic carbon and UV-absorbing material. The effects of annual season, secondary treatment process, and tertiary treatment process upon the properties of the effluent soluble organic matter were statistically significant at the 99% level. Effluent properties from the various treatments were sufficiently different to support the concept of the selection of appropriate treatments to minimize the effluent concentration of specific fractions of the soluble organic material as required for specific water reuse applications.

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