Flow characteristic and wastewater treatment performance of a pilot-scale airlift oxidation ditch

2009 ◽  
Vol 3 (4) ◽  
pp. 470-476 ◽  
Author(s):  
Hongtao Pang ◽  
Hanchang Shi ◽  
Huiming Shi
Keyword(s):  
Wastewater Treatment ◽  
Flow Characteristic ◽  
Pilot Scale ◽  
Oxidation Ditch ◽  
Treatment Performance ◽  
Airlift Oxidation Ditch

Wastewater Treatment by a Submerged Contact Media Process Using Net Plates

1991 ◽  
Vol 23 (10-12) ◽  
pp. 1853-1862 ◽  
Author(s):  
T. Nambu ◽  
K. Kawarura ◽  
M. Kaneko
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Retention Time ◽  
Municipal Wastewater ◽  
Pilot Scale ◽  
Recycled Water ◽  
Operational Conditions ◽  
Treatment Performance ◽  
Conventional Activated Sludge ◽  
Treated Municipal Wastewater

Wastewater treatment by using a series of bioreactors with submerged net plates, on which microbial growths could be developed, was studied to evaluate its treatment performance and to find suitable operational conditions for sufficient BOD and nitrogen removal. A comprehensive experimental study was carried out by using a bench-scale plant which treated artificial wastewater and a pilot-scale plant which treated municipal wastewater. This process treated well the wastewater with higher pollutant loads in comparison with the conventional activated sludge process. The wastewater containing 200 mg BOD/l was reduced to 20 mg BOD/l at the high BOD loading of 1,94 kg/m3 day and the retention time less than 5 hours. Nitrogen removal could be explained well by an index defined as the product of the water temperature and the retention time. When the ratio, in flow rate, of recycled water to influent was 4 and the index was more than 400, nitrogen removal more than 80 % was obtained.

Modelling of wastewater treatment plants – how far shall we go with sophisticated modelling tools?

2006 ◽  
Vol 53 (3) ◽  
pp. 79-89 ◽  
Author(s):  
G.C. Glover ◽  
C. Printemps ◽  
K. Essemiani ◽  
J. Meinhold
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Full Scale ◽  
Structure Identification ◽  
Oxidation Ditch ◽  
Computational Fluid Dynamics Analysis

Several levels of complexity are available for modelling of wastewater treatment plants. Modelling local effects rely on computational fluid dynamics (CFD) approaches whereas activated sludge models (ASM) represent the global methodology. By applying both modelling approaches to pilot plant and full scale systems, this paper evaluates the value of each method and especially their potential combination. Model structure identification for ASM is discussed based on a full-scale closed loop oxidation ditch modelling. It is illustrated how and for what circumstances information obtained via CFD (computational fluid dynamics) analysis, residence time distribution (RTD) and other experimental means can be used. Furthermore, CFD analysis of the multiphase flow mechanisms is employed to obtain a correct description of the oxygenation capacity of the system studied, including an easy implementation of this information in the classical ASM modelling (e.g. oxygen transfer). The combination of CFD and activated sludge modelling of wastewater treatment processes is applied to three reactor configurations, a perfectly mixed reactor, a pilot scale activated sludge basin (ASB) and a real scale ASB. The application of the biological models to the CFD model is validated against experimentation for the pilot scale ASB and against a classical global ASM model response. A first step in the evaluation of the potential of the combined CFD-ASM model is performed using a full scale oxidation ditch system as testing scenario.

scholarly journals Simulation of effective volume increasement inside oxidation ditch reactor

2018 ◽  
Vol 197 ◽  
pp. 13022
Author(s):  
Rositayanti Hadisoebroto ◽  
Yazid Bindar ◽  
Suprihanto Notodarmojo
Keyword(s):  
Wastewater Treatment ◽  
Water Flow ◽  
Flow Characteristic ◽  
Cfd Simulation ◽  
Flow Reactor ◽  
Plug Flow ◽  
Surface Model ◽  
Effective Volume ◽  
Oxidation Ditch ◽  
Treatment Unit

Oxidation ditch reactor is wastewater treatment unit that based on activated sludge process. Water flow characteristic inside reactor is either completely-mixed reactor or plug flow reactor. Water flow characterization plays important role in wastewater treatment process. To ensure the biological process going well, the water flow in reactor must be completely mixed type. Characterization study of water flow in reactor consume time thus financial, so the simulation using CFD (Computational Fluid Dynamics) becomes a good solution. Based on the calibrated model, the CFD simulation was generate to define the water flow characteristic of the oxidation ditch reactor in longitudinal section. The simulation was conducted using VoF (Volume of Fluid) scheme, an open surface model in unsteady flow with k-ε turbulence model. The simulation result shows that water flow inside the oxidation ditch reactor was plug flow. The role of aeration system is to increase water flow to be more homogen, indicated by higher effective volume inside the reactor. The simulation result shows that the aerator could increase effective volume inside the reactor from 32,94% into 55,5%. The higher effective volume means dead zone inside the reactor is reduced.

Improving Performance of Water Treatment on Oxidation Ditch Using Modification of Reactor Hydrodynamic

2014 ◽  
Vol 69 (6) ◽  
Author(s):  
Rositayanti Hadisoebroto ◽  
Idris Maxdoni Kamil ◽  
Suprihanto Notodarmojo ◽  
Yazid Bindar
Keyword(s):  
Wastewater Treatment ◽  
Biological Process ◽  
Great Influence ◽  
Treatment Plant ◽  
Domestic Wastewater ◽  
Oxidation Ditch ◽  
Treatment Performance ◽  
Domestic Wastewater Treatment ◽  
High Investment ◽  
Urban Wastewater Treatment

Urban wastewater treatment in Indonesia is limited, due to its high investment cost. To date, there are only 11 big cities that have centralized domestic wastewater treatment plant, such as in Jakarta, Tangerang, Bandung, Medan, Yogyakarta and Surakarta. There is also city sludge faecal treatment plant, like in Surabaya, Jakarta, Yogyakarta and Semarang. All the treatment process in these treatment plants is based on biological process, which are oxidation ditch (Tangerang and Surabaya), stabilization pond (Bandung) and extended aeration (Jakarta and Yogyakarta). Mostly, the biological treatment on the plants are malfunctioning, some of them because of operational capacity which cannot fulfill the design capacity. Yet, the effort of optimization only focuses on biological process aspect, while the hydraulic and physical aspects have a great influence to treatment performance. Research on modification of hydraulic aspect, both experimentally and by using computer simulation to improve treatment performance is needed.

Technological Solution for the Treatment of Wastewater Resulting from Autochthonous Aquacultures in Order to Protect the Marine Water Quality

2018 ◽  
Vol 68 (12) ◽  
pp. 2752-2755
Author(s):  
Carmen Tociu ◽  
Tania Zaharia ◽  
Elena Diacu ◽  
Cristina Maria ◽  
Florica Marinescu ◽  
...  
Keyword(s):  
Water Quality ◽  
Wastewater Treatment ◽  
Black Sea ◽  
Pilot Scale ◽  
Integrated System ◽  
The Black Sea ◽  
Technological Solution ◽  
Aluminium Sulphate ◽  
Metallurgical Slags ◽  
Treatment Step

This paper depicts the research conducted at a micro-pilot scale on autochthonous cultures in order to develop adequate technological solutions for the treatment of wastewater resulting from shrimp cultures (Palaemonidae) that would ensure the protection of the Black Sea ecosystem and constitute an applicable tool for the development of aquaculture in Romania. The proposed objectives were attained by adopting an integrated system of marine cultures shrimps-mussels-macrophyte algae, followed by a conventional chemical treatment step using aluminium sulphate recovered from metallurgical slags. This system together with wastewater treatment ensures an optimum development of species and a minimum load of pollutants in the aquatic environment.

Ammonia removal in a pilot-scale WSP complex in Northeast Brazil

1996 ◽  
Vol 33 (7) ◽  
pp. 165-171 ◽  
Author(s):  
J. Soares ◽  
S. A. Silva ◽  
R. de Oliveira ◽  
A. L. C. Araujo ◽  
D. D. Mara ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Surface Waters ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Ammonia Removal ◽  
Northeast Brazil ◽  
Environmental Legislation ◽  
Aerobic Conditions ◽  
High Degree

Ammonia removal was monitored in a waste stabilisation pond complex comprising ponds of different geometries and depths under two different operational regimes. It was found that a high degree of ammonia removal commenced in the secondary maturation ponds, with the highest removals occurring in the shallowest ponds as a consequence of improved aerobic conditions. The tertiary maturation ponds produced effluents with mean ammonia concentrations of < 5 mg N/l, the maximum permitted recommended by Brazilian environmental legislation for the discharge of effluents of wastewater treatment plants into surface waters. Ammonia removal in the secondary facultative and maturation ponds could be modelled using equations based on the volatilization mechanism proposed by Middlebrooks et al. (1982).

Characteristics of nitrogen removal and microbial distribution by application of spent sulfidic caustic in pilot scale wastewater treatment plant

2010 ◽  
Vol 62 (8) ◽  
pp. 1965-1965
Author(s):  
S. Park ◽  
J. Lee ◽  
J. Park ◽  
I. Byun ◽  
T. Park ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Nitrogen Removal ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Microbial Distribution ◽  
Spent Sulfidic Caustic ◽  
Sulfidic Caustic

Publisher‘s note. We regret that the published version of this article erroneously denoted the first author as corresponding author; in fact the formal corresponding author of this paper is Professor Taeho Lee, whose address is repeated below.

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