Control Strategies for a Combined Anaerobic (UASB) – Aerobic (Activated Sludge) Wastewater Treatment System

Braga, Carmela Maria Polito; Sperling, Marcos von; Braga, A.R.; Pena, Rocío

doi:10.1080/09593332608618608

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…The first research of a full scale UASB reactor, treating municipal wastewater, was conducted in Colombia (Schellinkhout & Collazos, 1992 Anaerobic wastewater treatment followed by aerobic post treatment was considered as an alternative to traditional wastewater treatment using an activated sludge process. The costs of a treatment plant with a UASB reactor followed by aerobic biological treatment are usually 20-50% lower for capital expenditures (CAPEX) and 50% for operational expenditures (OPEX) compared with a conventional activated sludge plant (Chernicharo, 2006;Polito Braga et al, 2005). A UASB reactor followed by a stonefilled trickling filter saves 40% CAPEX and 90% OPEX compared with a conventional activated sludge system (Aiyuk et al, 2006).…”

Section: Anaerobic Municipal Wastewater Treatment In Tropical Areasmentioning

confidence: 99%

Anaerobic treatment of municipal wastewater in a UASB-Digester system : temperature effect on system performance, hydrolysis and methanogenesis

Zhang¹

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Section: Anaerobic Municipal Wastewater Treatment In Tropical Areasmentioning

confidence: 99%

Anaerobic treatment of municipal wastewater in a UASB-Digester system : temperature effect on system performance, hydrolysis and methanogenesis

Zhang¹

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Treatment of Domestic Sewage in an Anaerobic–Aerobic Fixed‐bed Reactor with Recirculation of the Liquid Phase

Netto

Zaiat

2012

CLEAN Soil Air Water

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This study reports the performance of a combined anaerobic-aerobic packed-bed reactor that can be used to treat domestic sewage. Initially, a bench-scale reactor was operated in three experimental phases. In the first phase, the anaerobic reactor was operated with an average organic matter removal efficiency of 77% for a hydraulic retention time (HRT) of 10 h. In the second phase, the reactor was operated with an anaerobic stage followed by an aerobic zone, resulting in a mean value of 91% efficiency. In the third and final phase, the anaerobic-aerobic reactor was operated with recirculation of the effluent of the reactor through the anaerobic zone. The system yielded mean total nitrogen removal percentages of 65 and 75% for recycle ratios (r) of 0.5 and 1.5, respectively, and the chemical oxygen demand (COD) removal efficiencies were higher than 90%. When the pilot-scale reactor was operated with an HRT of 12 h and r values of 1.5 and 3.0, its performance was similar to that observed in the benchscale unit (92% COD removal for r ¼ 3.0). However, the nitrogen removal was lower (55% N removal for r ¼ 3.0) due to problems with the hydrodynamics in the aerobic zone. The anaerobic-aerobic fixed-bed reactor with recirculation of the liquid phase allows for concomitant carbon and nitrogen removal without adding an exogenous source of electron donors and without requiring any additional alkalinity supplementation.Abbreviations: COD, chemical oxygen demand; DHS, down-flow hanging sponge; HRT, hydraulic retention time; TSS, total suspended solids; UASB, upflow anaerobic sludge blanket Clean -Soil, Air, Water 2012, 40 (9), 965-971 965

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Biogas availability and its energy use in combined wastewater treatment plants (CWWTP)

Meneses

Vargas

Grosso

et al. 2011

Water Practice and Technology

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CWWTP are sanitation facilities formed by the coupling of an aerobic post-treatment (i.e. activated sludge, extended aeration, etc.) with a primary anaerobic treatment (i.e. UASB). In these combined arrangements, usually biogas produced in the UASB units is used to drive mechanical energy for aeration requirements in the secondary treatment (i.e. Activated Sludge, AS). Quality of effluents from CWWTP is similar to those from AS processes but combined treatments could become completely self-sufficient in energy consumption. In this manner, CWWTP improve the carbon-sequestration potential in the sanitation sector by increasing the capture of methane-rich biogas and its energy utilization. This study show how effluent quality parameters and energy demand in the AS unit can be influenced by control, sludge external recirculation and aeration strategies. Modelling and simulation tests, have allowed identifying operational conditions for potential energy savings and rational use of the biogas energy available in a full-scale CWWTP treating municipal sewage.

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Control Strategies for a Combined Anaerobic (UASB) – Aerobic (Activated Sludge) Wastewater Treatment System

Cited by 4 publications

References 3 publications

Anaerobic treatment of municipal wastewater in a UASB-Digester system : temperature effect on system performance, hydrolysis and methanogenesis

Anaerobic treatment of municipal wastewater in a UASB-Digester system : temperature effect on system performance, hydrolysis and methanogenesis

Treatment of Domestic Sewage in an Anaerobic–Aerobic Fixed‐bed Reactor with Recirculation of the Liquid Phase

Biogas availability and its energy use in combined wastewater treatment plants (CWWTP)

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