Performance analysis of anoxic selector in upgrading activated sludge process in tropical climate

2005 ◽  
Vol 52 (4) ◽  
pp. 27-37 ◽  
Author(s):  
Y.S. Cao ◽  
K.H. Teo ◽  
W.A. Yuen ◽  
W.Y. Long ◽  
B. Seah
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Stable State ◽  
Tropical Climate ◽  
Reaction Rates ◽  
Volume Index ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Sludge Settleability

The paper describes and analyses the performance of anoxic selectors in upgrading activated sludge process in a municipal wastewater treatment plant under tropical climate, where poor sludge settleability is a problem due to elevated temperature. Site monitoring and laboratory experiment were conducted to study the denitrification, sludge settleability, kinetics, mass balance, pH and alkalinity variation in the system. The sludge settleability measured in Sludge Volume Index (SVI) was observed to improve with the increasing degree of denitrification in the anoxic selector. Under well-developed stable state, an average SVI value of 136 ml/g was achieved, which was significantly lower than the value of 250 ml/g before the application of anoxic selector. The specific reaction rates for denitrification and nitrification at 30°C were 0.06 mg NO3-N/mg MLSS day and 0.08 mg NH4-N/mg MLSS day, respectively. The overall efficiencies of nitrification and denitrification were 86 percent and 55.4 percent, respectively, with an alkalinity recovery ratio of 15.4 percent. 32 percent of total COD removed was used up as electron donor in the denitrification process. However, due to absence of the internal Mixed Liquor Recirculation (MLR), a higher degree of denitrification occurred in the secondary sedimentation tank than in the anoxic zone. Issues for further studies are also discussed.

Application of Inertial Effect in Activated Sludge Process

2014 ◽  
Vol 955-959 ◽  
pp. 2080-2082
Author(s):  
Hong Mei Liu ◽  
Gang Zhu ◽  
Ke Zhao ◽  
Zhuang Liu
Keyword(s):  
Water Quality ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Hydraulic Retention Time ◽  
Treatment Plant ◽  
First Grade ◽  
Inertial Effect ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Cold Winter

The inertial effect applied to activated sludge process, the practice shows that in energy efficiency and reduce the hydraulic retention time it is obvious than not using the inertial effect. In cold winter areas to ensure water quality can meet the first grade A standard of "Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant" (GB18918-2002)

ANFIS Based Effluent pH Quality Prediction Model for an Activated Sludge Process

2013 ◽  
Vol 845 ◽  
pp. 538-542 ◽  
Author(s):  
Muhammad Sani Gaya ◽  
Norhaliza Abdul Wahab ◽  
Yahya M. Sam ◽  
Sharatul Izah Samsuddin
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Ph Value ◽  
Treatment Plant ◽  
Quality Prediction ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Anfis Model ◽  
Inference System

Activated sludge process is the most efficient technique used for municipal wastewater treatment plants. However, a pH value outside the limit of 6-9 could inhibit the activities of microorganisms responsible for treating the wastewater, and low pH value may cause damage to the treatment system. Therefore, prediction of pH value is essential for smooth and trouble-free operation of the process. This paper presents an adaptive neuro-fuzzy inference system (ANFIS) model for effluent pH quality prediction in the process. For comparison, artificial neural network is used. The model validation is achieved through use of full-scale data from the domestic wastewater treatment plant in Kuala Lumpur, Malaysia. Simulation results indicate that the ANFIS model predictions were highly accurate having the root mean square error (RMSE) of 0.18250, mean absolute percentage deviation (MAPD) of 9.482% and the correlation coefficient (R) of 0.72706. The proposed model is efficient and valuable tool for the activated sludge wastewater treatment process.

Impact of seeding with nitrifying bacteria on nitrification process efficiency

2001 ◽  
Vol 43 (1) ◽  
pp. 155-164 ◽  
Author(s):  
E. Plaza ◽  
J. Trela ◽  
B. Hultman
Keyword(s):  
Simple Model ◽  
Activated Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Process Efficiency ◽  
Nitrifying Bacteria ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Nitrification Process ◽  
High Fraction

Seeding of nitrifying bacteria into the activated sludge process was studied both theoretically and experimentally. A simple model was developed for prediction of the effects of seeding of nitrifying bacteria from a separate stage into the activated sludge process. The purpose of seeding is to improve the treatment results and the process stability as well as to decrease the volume requirements of the process. Pilot plant studies were carried out at the Uppsala municipal wastewater treatment plant in order to evaluate the effects of seeding. One line was supplied with supernatant from dewatering of digested sludge and the nitrification process gave an activated sludge with a high fraction of nitrifying bacteria, suitable for seeding. The other line was supplied with pre-precipitated wastewater and with the excess sludge from the line treating the supernatant. The experimental results showed that nitrification could be obtained at sludge ages that would otherwise preclude nitrification. Performance relationships for the system developed, based on laboratory and on-line measurements were studied and are presented. The studies show that seeding may decrease the necessary volume needs for a stable nitrification process and that the effects could be predicted by use of a simple model.

Experiences in wastewater characterization and model calibration for the activated sludge process

1996 ◽  
Vol 33 (12) ◽  
pp. 89-98 ◽  
Author(s):  
Xu Shulan ◽  
Bengt Hultman
Keyword(s):  
Activated Sludge ◽  
Model Calibration ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Simulation Models ◽  
Activated Sludge Process ◽  
Model Simplification ◽  
Municipal Wastewater Treatment ◽  
Oxygen Utilization ◽  
Parameter Values

Simulation models of the activated sludge process are believed to be a useful tool for process optimization and trouble-shooting at today's treatment plant. However, the application of the models is limited at most treatment plants due to lack of advanced input of parameter values required by the model. Simplification of the procedures of wastewater characterization was investigated. Characterization work was reduced to two oxygen utilization measurements and two COD analyses. Model calibration is demonstrated with experimental data from Kungsängen municipal wastewater treatment plant in Uppsala, Sweden.

Operation and Performance of a New Activated Sludge Process: The Contact Stabilization Extended Aeration Hybrid

1982 ◽  
Vol 14 (1-2) ◽  
pp. 367-380
Author(s):  
B H Paepcke ◽  
P H Jones
Keyword(s):  
Activated Sludge ◽  
Municipal Wastewater ◽  
Lower Cost ◽  
Treatment Plant ◽  
Aeration Tank ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Process Stability ◽  
Aeration Process ◽  
And Performance

In this study the operation and performance of a contact stabilization process operating under the extended aeration mode is examined. Data was obtained during a detailed plant study carried out at a full scale municipal wastewater treatment plant. This new hybrid activated sludge process has good process stability like the conventional extended aeration process, but achieves this with a significantly smaller aeration tank volume and therefore lower cost.

Design and operation of a wastewater treatment plant treating low concentration of municipal wastewater

1998 ◽  
Vol 38 (3) ◽  
pp. 167-172
Author(s):  
Jin Duanyao ◽  
Wang Baozhen ◽  
Wang Lin
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Primary Treatment ◽  
Ammonia Nitrogen ◽  
Activated Sludge Process ◽  
Municipal Wastewater Treatment ◽  
Foshan City

The Zhen'an Wastewater Treatment Plant in Foshan City, Guangdong Province, China is a newly built large municipal wastewater treatment plant in south China, situated in the southeast of the famous ancient Foshan City, has a treatment capacity of 100,000 m3/d, serves an area of 32 km2 and 220,000 P. E., occupies 7 ha area with a total investment of 220 million RMB (about 26.5 million U.S dollar), which was put into operation in December 1995. As it is difficult to design and operate the wastewater treatment plant because of the low organic concentration of its influent, the simplified A/O activated sludge process without primary treatment for simultaneous removal of phosphorus and ammonia nitrogen was employed to design the plant, by which, the wastewater is treated very well, with higher effluent quality than the traditional activated sludge process, while the capital and O/M costs are lower than the latter.

Comparison of anoxic granulation in USB reactors with various inocula

2010 ◽  
Vol 64 (2) ◽  
Author(s):  
Katarína Galbová ◽  
Petra Pagáčová ◽  
Miloslav Drtil ◽  
Ivana Jonatová
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Volume Index ◽  
Municipal Wastewater Treatment ◽  
Granulation Process ◽  
Volumetric Loading ◽  
Anoxic Granulation

AbstractAnoxic granulation process with four different inocula was monitored in a laboratory post-denitrification up-flow sludge bed (USB) reactor. Wastewater containing 20 mg L−1 NO3-N and methanol as an organic carbon source was used. Gradual increase of mass volumetric loading (B v) and hydraulic loading (γ) resulted in spontaneous granulation of anoxic biomass both from flocculant activated sludge and from anaerobic granulated sludge. With flocculant activated sludge as the inoculum, anoxic granules sedimentation properties and maximum loadings of the USB reactor depended on the sludge volume index (SVI) of the inoculum. B v,max achieved in the USB reactor with flocculant inoculum from a municipal wastewater treatment plant (SVI = 208 mL g−1) was only 4.2 kg of COD per m3 per day and 0.7 kg of NO3-N per m3 per day. B v,max using flocculant inoculum from an industrial wastewater treatment plant (SVI = 170 mL g−1) was 8.1 kg of COD per m3 per day and 1.35 kg of NO3-N per m3 per day. With anaerobic granulated inoculum (SVI range 8–11 mL g−1), markedly higher loadings in the USB reactor and lower SVI values of anoxic granulated biomass were achieved. Values of B v,max were in the range of 16.1–22.4 kg of COD per m3 per day and of 2.7–3.7 kg of NO3-N per m3 per day (depending on the inoculum and the granulation procedure). It was proved that anaerobic granulated sludge is not just an inoculum, it is also a carrier for new denitrification biomass.

Process evaluation of HASP with IMET system through SNR and SDNR for the efficient management of Sewage Treatment Plant

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Young H. Yoon ◽  
Jae R. Park ◽  
Sang W. Ahn ◽  
Kwang B. Ko ◽  
Kyung J. Min ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Linear Regression Analysis ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Reaction Rates ◽  
Nitrification Rate ◽  
Activated Sludge Process ◽  
Type Experiment ◽  
Batch Type ◽  
Nitrification And Denitrification

Hybrid Activated Sludge Process (HASP) with IMET was developed and applied to an activated sludge process for the advanced nutrient treatment in Korea. The characteristics of nitrogen removal from the HASP were investigated through a kinetic study by batch-type experiment. Online DB analysis produced from the IMET was conducted for the nutrient removal performance in the field demonstration plant treating 10,000 m3/day in G city of Korea. In this paper, we aimed to determine the effect of increasing NHM4+-N load on the specific nitrification rate (SNR) and the specific denitrification rate (SDNR) through a batch-type experiment, and to estimate the net reaction time for the phase-transfer rate using online DB analysis in the HASP operation. Experimental results include: (1) both the nitrification and denitrification followed first-order kinetics; (2) the maximum SNR and SDNR were 4.0301 mgN/gVSS·hr and 2.785 mgN/gVSS·hr, respectively; (3) comparison of reaction rates between nitrification and denitrification from the non-linear regression analysis found that nitrification rate was higher than denitrification.

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