Modelamiento del tratamiento biológico de aguas residuales; estudio en planta piloto de contactores biológicos rotatorios.//Modeling of biological wastewater treatment; study in pilot plant of rotating biological contactors.

El presente trabajo estudió el rendimiento del tratamiento biológico mediante un sistema de Contadores Biológicos Rotatorios (CBR) construido a nivel de laboratorio de la Universidad Politécnica Salesiana. Para ello se utilizaron aguas residuales obtenidas de la Planta de Tratamiento de Aguas Residuales de Ucubamba-Cuenca, se llevó a cabo un control y operación mediante la medición de parámetros físico químicos; nitratos, nitritos, cloro, amonio, pH, conductividad, sedimentación, turbidez y demanda química de oxígeno. Para luego establecer el modelo cinético de degradación del sustrato y validación del mismo, con los datos obtenidos en el laboratorio. Finalmente, los resultados experimentales fueron comparados con el modelo teórico, obteniéndose un resultado comparable entre ambos; se comprobó un ajuste experimental con un valor k (coeficiente de degradación de la materia orgánica) igual a 0,056 y con un R2 de 0,85 y 0,97 en el modelo teórico y experimental respectivamente. AbstractThe present work studied the performance of the biological treatment through a system of Rotating Biological Counters (RBC) built at the laboratory of the Universidad Politécnica Salesiana. Wastewater obtained from the Wastewater Treatment Plant of Ucubamba-Cuenca was used, the control and operation was carried out by measuring physical-chemical parameters; nitrates, nitrites, chlorine, ammonium, pH, conductivity, sedimentation, turbidity and chemical oxygen demand. Next, the kinetic model of substrate degradation was established and validation of the model was done with the data obtained in the laboratory. Finally, the experimental results were compared with the theoretical model, obtaining a comparable result between both; an experimental fit was verified with a k value (coefficient of degradation of organic matter) equal to 0,056 and with an R2 of 0.85 and 0.97 in the theoretical and experimental model respectively.

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Savings with upgraded performance through improved activated sludge denitrification in the combined activated sludge–biofilter system of the Southpest Wastewater Treatment Plant

Water Science & Technology ◽

10.2166/wst.2008.232 ◽

2008 ◽

Vol 57 (8) ◽

pp. 1287-1293 ◽

Cited By ~ 1

Author(s):

A. Jobbágy ◽

G. M. Tardy ◽

Gy. Palkó ◽

A. Benáková ◽

O. Krhutková ◽

...

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Biological Treatment ◽

Treatment Plant ◽

Oxygen Demand ◽

Process Efficiency ◽

Initial Value ◽

Initial Profile ◽

Biological Treatment System

The purpose of the experiments was to increase the rate of activated sludge denitrification in the combined biological treatment system of the Southpest Wastewater Treatment Plant in order to gain savings in cost and energy and improve process efficiency. Initial profile measurements revealed excess denitrification capacity of the preclarified wastewater. As a consequence, flow of nitrification filter effluent recirculated to the anoxic activated sludge basins was increased from 23,000 m3 d−1 to 42,288 m3 d−1 at an average preclarified influent flow of 64,843 m3 d−1, Both simulation studies and microbiological investigations suggested that activated sludge nitrification, achieved despite the low SRT (2–3 days), was initiated by the backseeding from the nitrification filters and facilitated by the decreased oxygen demand of the influent organics used for denitrification. With the improved activated sludge denitrification, methanol demand could be decreased to about half of the initial value. With the increased efficiency of the activated sludge pre-denitrification, plant effluent COD levels decreased from 40–70 mg l−1 to < 30–45 mg l−1 due to the decreased likelihood of methanol overdosing in the denitrification filter

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Short investigation on occurrence and removal of semivolatiles during wastewater treatment processes

Romanian Journal of Ecology & Environmental Chemistry ◽

10.21698/rjeec.2021.216 ◽

2021 ◽

Vol 3 (2) ◽

pp. 130-140

Author(s):

Maria Diana Puiu ◽

Keyword(s):

Wastewater Treatment ◽

Organic Contaminants ◽

Biological Treatment ◽

Organic Matter Content ◽

Treatment Plant ◽

Oxygen Demand ◽

Matter Content ◽

Physical Treatment ◽

Dissolved Air Flotation ◽

Treatment Processes

The food industry wastewater is known to present a high organic matter content, due to specific raw materials and processing activities. Even if these compounds are not directly toxic to the environment, high concentrations in effluents could represent a source of pollution as discharges of high biological oxygen demand may impact receiving river's ecosystems. Identifying the main organic contaminants in wastewater samples represents the first step in establishing the optimum treatment method. The sample analysis for the non-target compounds through the GC-MS technique highlights, along with other analytical parameters, the efficiency of the main physical and biological treatment steps of the middle-size Wastewater Treatment Plant (WWTP). Long-chain fatty acids and their esters were the main abundant classes of non-target identified compounds. The highest intensity detection signal was reached by n-hexadecanoic acid or palmitic acid, a component of palm oil, after the physical treatment processes with dissolved air flotation, and by 1-octadecanol after biological treatment.

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Study of the Treatment of Coking Wastewater by Biological Nitrogen Removal with Physical-Chemical Process

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.3729 ◽

2011 ◽

Vol 383-390 ◽

pp. 3729-3733 ◽

Cited By ~ 1

Author(s):

Ya Er Ba ◽

Zi Fu Li

Keyword(s):

Wastewater Treatment ◽

Biological Treatment ◽

Treatment Plant ◽

First Grade ◽

Special Treatment ◽

Biological Nitrogen Removal ◽

Coking Wastewater ◽

Physical Chemical ◽

Treatment Agent ◽

Biological Nitrogen

Coking wastewater component complex is difficult to treat and yet unable to achieve the emission target by biological treatment, thus needs further processing. Wastewater treatment plant of coking plant in Bao Gang applied A/O process in biological treatment, used special treatment agent -M180 by coagulation and sedimentation process. Through treatment, the parameters reached the first grade of GB13456-92. It is of great reference significance for process debug and operation of the coking wastewater treatment system.

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Packed-Cage RBC with Combined Cultivation of Suspended and Fixed-Film Biomass

Water Science & Technology ◽

10.2166/wst.1990.0139 ◽

1990 ◽

Vol 22 (1-2) ◽

pp. 101-111 ◽

Cited By ~ 5

Author(s):

J. Wanner ◽

M. Sýkora ◽

M. Kos ◽

J. Miklenda ◽

P. Grau

Keyword(s):

Wastewater Treatment ◽

Wastewater Treatment Plant ◽

Random Medium ◽

Treatment Plant ◽

Mixing Effect ◽

Scale Unit ◽

Fixed Film ◽

Rotating Biological Contactors ◽

Bod Removal

The situation in the treatment of wastewaters from small sources in Czechoslovakia has been discussed and two types of manufactured rotating biological contactors have been described. The evaluation of RBCs' operation showed the main disadvantages of the contactors with conventional discs, viz. the low 0C and low mixing effect. In a newly designed RBC, the discs or packets of discs were replaced by a cage packed with a random medium. The cage was equipped with tubular aeration and mixing elements. The long-term tests with a pilot-plant and a full-scale unit using synthetic as well as municipal wastewaters proved the ability of the packed-cage RBC to achieve a low effluent BOD with such organic loadings when the effluent from the conventional RBCs already deteriorated. Besides the BOD removal the 0C of the packed-cage RBCs was tested to verify the possibility of the combined cultivation of suspended and fixed-film biomass. On the basis of results presented here, a new package wastewater treatment plant for about 500 PE will be designed.

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Use of chemical upgrading (CU) in Hungary and Slovakia

Water Science & Technology ◽

10.2166/wst.1994.0227 ◽

1994 ◽

Vol 30 (5) ◽

pp. 87-95 ◽

Cited By ~ 2

Author(s):

Susan E. Murcott ◽

Donald R. F. Harleman

Keyword(s):

Wastewater Treatment ◽

Biological Treatment ◽

Treatment Plant ◽

Domestic Sewage ◽

Metal Salts ◽

Plant Performance ◽

Eastern European ◽

Low Doses ◽

The Past ◽

Treatment Technologies

In the past decade, the development of polymers and new chemical technologies has opened the way to using low doses of chemicals in wastewater treatment. “Chemical upgrading” (CU) is defined in this paper as an application of these chemical technologies to upgrade overloaded treatment systems (typically consisting of conventional primary plus biological treatment) in Central and Eastern European (CEE) countries. Although some of the chemical treatment technologies are proven ones in North America, Scandinavia, and Germany, a host of factors, for example, the variations in composition and degree of pollution, the type of technologies in use, the type and mix of industrial and domestic sewage, and the amount of surface water, had meant that the viability of using CU in CEE countries was unknown. This report describes the first jar tests of CU conducted during the summer of 1993. The experiments show CU's ability to improve wastewater treatment plant performance and to potentially assist in the significant problem of overloaded treatment plants. Increased removal of BOD, TSS, and P in the primary stage of treatment is obtained at overflow rates above 1.5 m/h, using reasonably priced, local sources of metal salts in concentrations of 25 to 50 mg/l without polymers.

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Management of Dairy Waste in the Sonoran Desert Using Constructed Wetland Technology

Water Science & Technology ◽

10.2166/wst.1999.0136 ◽

1999 ◽

Vol 40 (3) ◽

pp. 57-65 ◽

Cited By ~ 6

Author(s):

Martin M. Karpiscak ◽

Robert J. Freitas ◽

Charles P. Gerba ◽

Luis R. Sanchez ◽

Eylon Shamir

Keyword(s):

Sonoran Desert ◽

Suspended Solids ◽

Waste Treatment ◽

Oxygen Demand ◽

Dairy Wastewater ◽

Chemical Parameters ◽

Treatment Facility ◽

Physical Chemical ◽

Scirpus Validus ◽

Surface Wetland

An integrated wastewater treatment facility, consisting of upper (solids separators, anaerobic lagoons, and aerobic ponds) and lower (wetland cells) subsystems, has been built to replace the lagoon at a dairy in Arizona, USA. The collection sump of the new waste treatment facility collects all dairy wastewater outflow. Wastewater is then pumped to solids separators, and flows by gravity to anaerobic ponds and aerobic ponds. The upper subsystem is expected to treat the water sufficiently so that the wetland cells may achieve further pollutant reductions. The lower subsystem, comprised of 8 surface wetland cells with an approximate surface area of 5,000 m2, receives outflow from the ponds. The cells are planted with cattail (Typha domingensis), soft-stem bulrush (Scirpus validus), and reed (Phragmites australis). After treatment is completed via the lagoons and ponds followed by the wetland cells, the wastewater can be reused to flush barns or to irrigate crops. Performance of the overall system is evaluated by measuring physical, chemical and biological parameters in water samples taken from selected locations along the treatment system. Chemical parameters studied include biochemical oxygen demand, pH, total suspended solids, nitrogen species. Biological monitoring included coliforms (total and fecal) and Listeria monocytogenes.

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Evaluating the treatment performance of a full scale Activated Sludge Plant in Islamabad, Pakistan

Water Practice & Technology ◽

10.2166/wpt.2012.016 ◽

2012 ◽

Vol 7 (1) ◽

Cited By ~ 1

Author(s):

S. S. Fatima ◽

S. Jamal Khan

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Wastewater Treatment Plant ◽

Suspended Solids ◽

Treatment Plant ◽

Oxygen Demand ◽

Full Scale ◽

Operational Parameter ◽

Mixed Liquor ◽

Treatment Performance

In this study, the performance of wastewater treatment plant located at sector I-9 Islamabad, Pakistan, was evaluated. This full scale domestic wastewater treatment plant is based on conventional activated sludge process. The parameters which were monitored regularly included total suspended solids (TSS), mixed liquor suspended solids (MLSS), mixed liquor volatile suspended solids (MLVSS), biological oxygen demand (BOD), and chemical oxygen demand (COD). It was found that the biological degradation efficiency of the plant was below the desired levels in terms of COD and BOD. Also the plant operators were not maintaining consistent sludge retention time (SRT). Abrupt discharge of MLSS through the Surplus Activated sludge (SAS) pump was the main reason for the low MLSS in the aeration tank and consequently low treatment performance. In this study the SRT was optimized based on desired MLSS concentration between 3,000–3,500 mg/L and required performance in terms of BOD, COD and TSS. This study revealed that SRT is a very important operational parameter and its knowledge and correct implementation by the plant operators should be mandatory.

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Enhancing nitrogen removal efficiency in a dyestuff wastewater treatment plant with the IFFAS process: the pilot-scale and full-scale studies

Water Science & Technology ◽

10.2166/wst.2017.522 ◽

2017 ◽

Vol 77 (1) ◽

pp. 70-78 ◽

Cited By ~ 4

Author(s):

Yanjun Mao ◽

Xie Quan ◽

Huimin Zhao ◽

Yaobin Zhang ◽

Shuo Chen ◽

...

Keyword(s):

Wastewater Treatment ◽

Activated Sludge ◽

Removal Efficiency ◽

Nitrogen Removal ◽

Treatment Plant ◽

Oxygen Demand ◽

Pilot Scale ◽

Full Scale ◽

Nitrification And Denitrification ◽

Dyestuff Wastewater

Abstract The activated sludge (AS) process is widely applied in dyestuff wastewater treatment plants (WWTPs); however, the nitrogen removal efficiency is relatively low and the effluent does not meet the indirect discharge standards before being discharged into the industrial park's WWTP. Hence it is necessary to upgrade the WWTP with more advanced technologies. Moving bed biofilm processes with suspended carriers in an aerobic tank are promising methods due to enhanced nitrification and denitrification. Herein, a pilot-scale integrated free-floating biofilm and activated sludge (IFFAS) process was employed to investigate the feasibility of enhancing nitrogen removal efficiency at different hydraulic retention times (HRTs). The results showed that the effluent chemical oxygen demand (COD), ammonium nitrate (NH4+-N) and total nitrogen (TN) concentrations of the IFFAS process were significantly lower than those of the AS process, and could meet the indirect discharge standards. PCR-DGGE and FISH results indicated that more nitrifiers and denitrifiers co-existed in the IFFAS system, promoting simultaneous nitrification and denitrification. Based on the pilot results, the IFFAS process was used to upgrade the full-scale AS process, and the effluent COD, NH4+-N and TN of the IFFAS process were 91–291 mg/L, 10.6–28.7 mg/L and 18.9–48.6 mg/L, stably meeting the indirect discharge standards and demonstrating the advantages of IFFAS in dyestuff wastewater treatment.

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