A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment

This paper proposes a simple and easy-to-use methodology for forecasting the impact of changes in influent chemical oxygen demand (COD) and in the emission limit values (ELVs) of COD and total nitrogen on average energy requirements for aeration and sludge production by activated sludge wastewater t...

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Autores principales:	Catarina Silva, Maria João Rosa
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	oxygen energy sludge WWTPs regulation Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/cad31eb8169f4f8cadd9b9294c73f8f1
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spelling	oai:doaj.org-article:cad31eb8169f4f8cadd9b9294c73f8f12021-11-11T19:50:32ZA Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment10.3390/su1321122932071-1050https://doaj.org/article/cad31eb8169f4f8cadd9b9294c73f8f12021-11-01T00:00:00Zhttps://www.mdpi.com/2071-1050/13/21/12293https://doaj.org/toc/2071-1050This paper proposes a simple and easy-to-use methodology for forecasting the impact of changes in influent chemical oxygen demand (COD) and in the emission limit values (ELVs) of COD and total nitrogen on average energy requirements for aeration and sludge production by activated sludge wastewater treatment plants (WWTPs). The methodology is based on mass balances of sludge production and oxygen requirements for carbonaceous material biodegradation and/or nitrification, oxygen transfer and aeration equipment efficiency. Using average values of historical data of regular monitoring (water quality and operating conditions) WWTP-specific equations of oxygen requirements, energy consumption and sludge production are derived as a function of influent COD and influent N-total, which may be used to quantify the impact of influent and ELV changes. The methodology was tested in five extended aeration WWTPs for three scenarios established by the utility. The results show that increasing influent COD, from 900 to 1300 mg/L, for example, significantly increases the energy consumption by 49% and sludge production by 53%. For influent 54–68 mg/L N-total, imposing 15 mgN/L ELV results in a 9–26% increase in energy consumption. The COD ELV change studied (season-specific, from 150 mg/L 12 months/year to 125 mg/L 8 months/year to 100 mg/L 4 months/year) increases the energy consumption by 1.8–2.6% and the sludge production by 4.3–5.4%.Catarina SilvaMaria João RosaMDPI AGarticleoxygenenergysludgeWWTPsregulationEnvironmental effects of industries and plantsTD194-195Renewable energy sourcesTJ807-830Environmental sciencesGE1-350ENSustainability, Vol 13, Iss 12293, p 12293 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	oxygen energy sludge WWTPs regulation Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
spellingShingle	oxygen energy sludge WWTPs regulation Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350 Catarina Silva Maria João Rosa A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
description	This paper proposes a simple and easy-to-use methodology for forecasting the impact of changes in influent chemical oxygen demand (COD) and in the emission limit values (ELVs) of COD and total nitrogen on average energy requirements for aeration and sludge production by activated sludge wastewater treatment plants (WWTPs). The methodology is based on mass balances of sludge production and oxygen requirements for carbonaceous material biodegradation and/or nitrification, oxygen transfer and aeration equipment efficiency. Using average values of historical data of regular monitoring (water quality and operating conditions) WWTP-specific equations of oxygen requirements, energy consumption and sludge production are derived as a function of influent COD and influent N-total, which may be used to quantify the impact of influent and ELV changes. The methodology was tested in five extended aeration WWTPs for three scenarios established by the utility. The results show that increasing influent COD, from 900 to 1300 mg/L, for example, significantly increases the energy consumption by 49% and sludge production by 53%. For influent 54–68 mg/L N-total, imposing 15 mgN/L ELV results in a 9–26% increase in energy consumption. The COD ELV change studied (season-specific, from 150 mg/L 12 months/year to 125 mg/L 8 months/year to 100 mg/L 4 months/year) increases the energy consumption by 1.8–2.6% and the sludge production by 4.3–5.4%.
format	article
author	Catarina Silva Maria João Rosa
author_facet	Catarina Silva Maria João Rosa
author_sort	Catarina Silva
title	A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
title_short	A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
title_full	A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
title_fullStr	A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
title_full_unstemmed	A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment
title_sort	practical methodology for forecasting the impact of changes in influent loads and discharge consents on average energy consumption and sludge production by activated sludge wastewater treatment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/cad31eb8169f4f8cadd9b9294c73f8f1
work_keys_str_mv	AT catarinasilva apracticalmethodologyforforecastingtheimpactofchangesininfluentloadsanddischargeconsentsonaverageenergyconsumptionandsludgeproductionbyactivatedsludgewastewatertreatment AT mariajoaorosa apracticalmethodologyforforecastingtheimpactofchangesininfluentloadsanddischargeconsentsonaverageenergyconsumptionandsludgeproductionbyactivatedsludgewastewatertreatment AT catarinasilva practicalmethodologyforforecastingtheimpactofchangesininfluentloadsanddischargeconsentsonaverageenergyconsumptionandsludgeproductionbyactivatedsludgewastewatertreatment AT mariajoaorosa practicalmethodologyforforecastingtheimpactofchangesininfluentloadsanddischargeconsentsonaverageenergyconsumptionandsludgeproductionbyactivatedsludgewastewatertreatment
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A Practical Methodology for Forecasting the Impact of Changes in Influent Loads and Discharge Consents on Average Energy Consumption and Sludge Production by Activated Sludge Wastewater Treatment

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