Demand response measures at a small-scale wastewater treatment plant installed with a photovoltaic system

Nakakubo, Toyohiko; Okuno, Fumika; Maki, Seiya et al.

Journal of Cleaner Production, 2025, 516, 145730

Number of Access:63（2025-10-31 16:43 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/102208

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Title
Demand response measures at a small-scale wastewater treatment plant installed with a photovoltaic system
Creator
NRID
1000070648766 1000070648766
ORCID
0000-0002-3048-2237 0000-0002-3048-2237
researchmap permalink
Nakakubo_Toyohiko Nakakubo_Toyohiko
CreatorName
Nakakubo, Toyohiko
CreatorName
Okuno, Fumika
NRID
1000040785242 1000040785242
CreatorName
Maki, Seiya
NRID
1000070436319 1000070436319
CreatorName
Hirano, Yujiro
Subject
Energy management
Load adjustment
Load shifting
Oxidation ditch
Sludge treatment
Description
Nakakubo T., Okuno F., Maki S., et al. Demand response measures at a small-scale wastewater treatment plant installed with a photovoltaic system. Journal of Cleaner Production 516, 145730 (2025); https://doi.org/10.1016/j.jclepro.2025.145730.
Abstract
Wastewater treatment plants (WWTPs) consume large amounts of energy, and measures to upgrade WWTPs to become self-sufficient through the use of renewable energy are being promoted. We developed an electricity demand simulation model of a small-scale WWTP with a photovoltaics (PV) system at a 30-min resolution. A demand response (DR) measure for the plant's wastewater treatment process was designed to match a high-load operation with continuous aeration to the PV daily generation curve by utilizing a load-adjustment tank. Similarly, a DR measure for the plant's sludge treatment process was designed to increase the dehydrator operating time and take advantage of seasonal PV generation surpluses by receiving household sludge waste collected from outside of the sewerage area. Self-sufficiency and self-consumption rates were evaluated based on the electricity supply-demand balance at a 30-min resolution under the condition that the total annual PV power generation and total annual demand of the WWTP were approximately equal. Compared to the base scenario that reproduced the electricity demand in the WWTP in FY2018, self-sufficiency and self-consumption rates were both increased by 14.1 % through implementation of the two DR measures under DR-W+S scenario. The improvement of self-sufficiency also led to a reduction of greenhouse gas emissions, and the annual emissions were reduced by 36.3 % under the DR-W+S scenario compared with the base scenario. From the aspect of economic in the 20-year project period, the estimated net present value was turned to be positive in the 14th year under DR-W+S scenario by improving the electricity trade balance.
Publisher
Elsevier Ltd
Source Title
Journal of Cleaner Production
Volume (Issue)
516
Page
145730
Date of Issued
2025-06-02
Language
English
Handle URL
https://hdl.handle.net/11094/102208
PISSN
09596526
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.jclepro.2025.145730
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article