Effect of biosorption on the damping of influent fluctuation in activated sludge aeration tanks

1997 ◽  
Vol 35 (7) ◽  
pp. 79-87 ◽  
Author(s):  
Koichi Fujie ◽  
Hong-Ying Hu ◽  
Byung-Ran Lim ◽  
Huang Xia
Keyword(s):  
Activated Sludge ◽  
Organic Pollutants ◽  
Control Strategies ◽  
Domestic Wastewater ◽  
Activated Sludge Process ◽  
Organic Substances ◽  
Effluent Water ◽  
Organic Removal ◽  
Set Up ◽  
The Mathematical Model

To describe the organic removal performance in an activated sludge process, the effect of biological adsorption (biosorption, hereinafter) of both soluble and particulate organic substances (SOS and POS, respectively, hereinafter) on the rate of organic removal must be taken into account. This study quantitatively investigated the biosorption of organic pollutants in the domestic wastewater by the activated sludge. The capability of biosorption and the rate of bio-oxidation of organic pollutants were formulated based on the experimental results as functions of both COD concentration and temperature. The biosorption capacity of activated sludge was proportional to COD concentration in the mixed liquor originated from the influent. The kinetic expressions were combined with the equation of longitudinal liquid mixing to set up the mathematical model to predict the effluent COD, and thus to clarify the effect of biosorption on the damping of influent fluctuations of both COD concentration and the inflow rate. The model was also successfully applied to assessing the effectiveness of MLSS control strategies in equalizing the effluent water quality.

Control of an activated sludge process with nitrogen removal – a benchmark study

2002 ◽  
Vol 45 (4-5) ◽  
pp. 135-142 ◽  
Author(s):  
B. Carlsson ◽  
A. Rehnström
Keyword(s):  
Activated Sludge ◽  
Flow Rate ◽  
Control Strategies ◽  
Ammonia Level ◽  
Physical Models ◽  
Activated Sludge Process ◽  
Nitrate Level ◽  
Recirculation Flow ◽  
Set Up ◽  
Aeration Capacity

In this paper, a simulation benchmark of a predenitrifying activated sludge process is used to evaluate a number of control strategies. A main procedure has been to use feedforward terms that are based on simplified physical models. Important mass balance relations may then be incorporated in the control law. The nitrate level in the last anoxic zone is controlled by the dosage of an external carbon source and the nitrate level in the last aerobic zone is controlled by the internal recirculation flow rate. The ammonia level is controlled by a DO set-point controller. In order to be able to have as high a sludge level as possible without sludge escape, the sludge blanket height in the settler is controlled by the excess sludge flow rate. Compared to the default set up of the benchmark, the controllers could reduce the effluent nitrate significantly whereas the effluent ammonia was only marginally decreased. The main problem is that the aeration capacity defined in the benchmark is too low.

A Batch Activated Sludge Study of Pineapple Wastewater Using a Bioaugmentation Process

1991 ◽  
Vol 24 (5) ◽  
pp. 233-240 ◽  
Author(s):  
Nik Fuaad Nik Abllah ◽  
Aik Heng Lee
Keyword(s):  
Activated Sludge ◽  
Removal Efficiency ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Ammonia Nitrogen ◽  
Batch Reactors ◽  
Organic Loading ◽  
Suitable Alternative ◽  
Organic Removal ◽  
Sludge Production

A laboratory study was conducted to determine the feasibility of batch activated sludge reactor for treating pineapple wastewater and to examine the effects of bioaugmentation on treatment performance. The experimental set-up consists of eleven batch reactors. Activated sludge obtained from a wastewater treatment plant treating domestic wastewater was used as seed for the reactors. Synthetic pineapple wastewater was used as feed for the reactors. The eleven reactors were arranged to evaluate the total organic removal, nitrification, and sludge production by bioaugmentation process. Three major factors considered were influent organic loading, ammonia-nitrogen, and dosage of bacterial-culture-product addition. Removal of TOG (total organic carbon), sludge production in terms of SS(suspended solids), and ammonia-nitrogen removal variation are used as evaluation parameters. The TOC removal efficiency after the end of a 48 hour reactor run, for influent TOC of 350.14 to 363.30 mg/l, and 145.92 to 169.66 mg/l, was 94.41 to 95.89%, and 93.72 to 94.73% respectively. Higher organic removal was observed in the bioaugmented reactors with higher organic loading. The better organic removal efficiency in the bioaugmented reactors was probably due to activities of bacteria added. The test results also indicated that sludge yield was enhanced by the bacteria additive and high bacteria dosage produced less sludge. Bioaugmentation was observed to be a suitable alternative for enhancing the biological treatment of pineapple wastewater.

Respirometry for determination of the influents SS-concentration

1996 ◽  
Vol 33 (1) ◽  
pp. 311-323 ◽  
Author(s):  
A. Witteborg ◽  
A. van der Last ◽  
R. Hamming ◽  
I. Hemmers
Keyword(s):  
Experimental Design ◽  
Activated Sludge ◽  
Substrate Concentration ◽  
Full Scale ◽  
Activated Sludge Process ◽  
Respiration Rates ◽  
On Line ◽  
Large Measurement ◽  
Set Up

A method is presented for determining influent readily biodegradable substrate concentration (SS). The method is based on three different respiration rates, which can be measured with a continuous respiration meter which is operated in a cyclic way. Within the respiration meter nitrification is inhibited through the addition of ATU. Simulations were used to develop the respirometry set-up and decide upon the experimental design. The method was tested as part of a large measurement programme executed at a full-scale plant. The proposed respirometry set-up has been shown to be suitable for a semi-on-line determination of an influent SS which is fully based on the IAWQ #1 vision of the activated sludge process. The YH and the KS play a major role in the principle, and should be measured directly from the process.

Advanced Treatment of Domestic Wastewater Using Sequencing Batch Reactor Activated Sludge Process

1993 ◽  
Vol 28 (10) ◽  
pp. 267-274 ◽  
Author(s):  
M. Imura ◽  
E. Suzuki ◽  
T. Kitao ◽  
S. Iwai
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Domestic Wastewater ◽  
Experimental Period ◽  
Small Scale ◽  
Experimental Plant ◽  
Activated Sludge Process ◽  
Nitrogen And Phosphorus ◽  
Experimental Apparatus

In order to apply a sequencing batch reactor activated sludge process to small scale treatment facilities, various experiments were conducted by manufacturing an experimental apparatus made of a factory-produced FRP cylinder transverse tank (Ø 2,500mm). Results of the verification test conducted for one year by leading the wastewater discharged from apartment houses into the experimental apparatus were as follows. Excellent performance was achieved without any addition of carbon source, irrespective of the organic compound concentration and the temperature of raw wastewater. Organic substances, nitrogen and phosphorus were removed simultaneously. Due to the automated operation format, stable performance was obtained with only periodic maintenance. Though water depth of the experimental plant was shallow, effective sedimentation of activated sludge was continued during the experimental period. Regarding the aerobic and anaerobic process, nitrification and denitrification occurred smoothly.

scholarly journals Comparison of Organic Substances in the Contact Aeration Process and the Activated Sludge Process.

2001 ◽  
Vol 24 (10) ◽  
pp. 693-698
Author(s):  
Takeshi YAHASHI ◽  
Youmei KUSHIDA ◽  
Takao WATANABE ◽  
Hideaki OHMORI ◽  
Yoshio INOUE
Keyword(s):  
Activated Sludge ◽  
Activated Sludge Process ◽  
Organic Substances ◽  
Aeration Process

The Modeling and Control Study of VSC-MTDC System

2012 ◽  
Vol 516-517 ◽  
pp. 1453-1458 ◽  
Author(s):  
Peng Ye ◽  
Lin Yuan ◽  
Duo Jiao Guan ◽  
Xing Wei Xu ◽  
Kai Yuan Hou
Keyword(s):  
Reactive Power ◽  
Control Strategies ◽  
Local Mode ◽  
Modeling And Control ◽  
Voltage Controller ◽  
Control Scheme ◽  
Dc Voltage Control ◽  
Set Up ◽  
And Control ◽  
The Mathematical Model

VSC-Multi-Terminal Direct Current(VSC-MTDC) system is much more controllable and economic. In this paper, the mathematical model for the VSC-MTDC system is set up. Base on this model, the multi-terminal constant DC voltage control scheme with an offset component was developed for MTDC system in the distribute network. Decoupling linear PI controllers are applied for the independent control of active and reactive power. Constant DC and AC voltage controller is implemented respectively for source side and loads side for the high quality power supply. Simulation results show that the control scheme is very effective. With the proposed control strategies, dynamic process of the system can be controlled effectively. What is more, the control law is not complex and it is in the local mode. All of these merits make the control strategy very practical.

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