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Experimental and numerical design of renewable-energy-supported advanced biological wastewater treatment plant

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Abstract

Nowadays biological wastewater treatment processes are more applied than other physical and chemical methods to the treatment of domestic wastewater. By the way, energy consumption plays an important role in wastewater treatment plants. In order to realize energy efficiency, the initial investment costs as well as the operating costs should be taken into account for new installations. Energy consumption can be saved, and the energy can be generated with the choice of mechanical equipment in the wastewater treatment plants, the optimum system design, the use of the organic content of the wastewater, supporting of renewable energy sources in the existing treatment area. In this study, an advanced biological wastewater treatment plant is selected in the city of Malatya. This plant is modeled by SASSPro numerical program. Then, the obtained numerical and experimental results are discussed and compared. These results show that numerical results are in good agreement with measurement one. Also, in order to meet the energy requirement of the proposed plant, renewable-energy-supported advanced biological wastewater treatment plant is modeled with Polysun software. A 2.85-MW photovoltaic panel, 107 thermal solar panels and 99-m-deep geothermal heat pump were used in this modeling. As a result of the modeling, annual electricity of 5,750,000 kWh and 7,300,300 L hot water at 50 °C are obtained. Hot water can be used for heating the wastewater and can be used for drying purposes.

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Abbreviations

SRT:

Solids retention time or sludge age (Vp/Qw)

Temp:

Mean biomass temperature (°C)

Qin:

Mean influent flow rate (ML/day)

TCODi:

Total COD in the influent (mg/L)

ALKi:

Influent alkalinity in the form CaCO3 (mg/L)

Qw:

Waste sludge flow, wasting from aerator mixed liquor (ML/day)

USCODe:

Unbiodegradable soluble COD in the effluent (mg/L)

NH4-Ne:

Effluent nitrogen in the form of ammonia was Nae (mg/L)

TPe:

Total phosphorus in the effluent (mg/L)

PAO:

Heterotrophic polyphosphate-accumulating organisms

F/M:

Food-to-microorganism loading (mgBOD/mgVSS)

VSS:

Volatile suspended solids component of the sludge mass (mg/L)

Van:

Total volume of anoxic zone (ML)

pH:

pH of the biomass (typically measured in aeration zone)

TKNi:

Total Kjeldahl nitrogen (organic + ammonia nitrogen) in the influent (mg/L)

TPi:

Total phosphorus in the influent (mg/L)

SSVI:

Stirred sludge volume index (mL/gSS)

COD:

Chemical oxygen demand

Vp:

Total process volume of the plant (ML)

ML:

Megaliters

TKNe:

Total Kjeldahl nitrogen (organic + ammonia nitrogen) in the effluent (mg/L)

NO3-Ne:

Effluent nitrogen in the form of nitrate was Nne (mg/L)

Pse:

Potentially enhanced P storage by PAOs (beyond that for PAO growth only) (mg/L)

ALKe:

Effluent alkalinity in the form CaCO3 (mg/L)

BOD:

Biochemical oxygen demand

Va:

Total volume of anaerobic zone (ML)

Vae:

Total volume of aerobic zone (ML)

P :

Phosphorus

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Acknowledgement

I would like to thank editors and anonymous reviewers for their suggestions to improve the paper.

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Authors and Affiliations

  1. Department of Environmental Engineering, Firat University, Elazig, Turkey

    E. Gürtekin

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  1. E. Gürtekin
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Correspondence to E. Gürtekin.

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Editorial responsibility: Parveen Fatemeh Rupani.

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Gürtekin, E. Experimental and numerical design of renewable-energy-supported advanced biological wastewater treatment plant. Int. J. Environ. Sci. Technol. 16, 1183–1192 (2019). https://doi.org/10.1007/s13762-018-2088-x

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  • DOI: https://doi.org/10.1007/s13762-018-2088-x

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