A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors

Although operators periodically measure the sludge volume index (SVI) to stabilize the bioreactor and solid–liquid separation during the wastewater treatment process, there is a problem of inconsistency attributed to the subjective judgment of the operator. This study aims to investigate the possibi...

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Autores principales:	Seong-Min Hong, Hyun-Ook Kim, Choong-Gon Kim
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CdS photoresistor sludge sedimentation settling SVI device Technology T
Acceso en línea:	https://doaj.org/article/ab2dc2983cca4187b8dea388f80d4862
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spelling	oai:doaj.org-article:ab2dc2983cca4187b8dea388f80d48622021-11-25T17:28:58ZA Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors10.3390/en142278171996-1073https://doaj.org/article/ab2dc2983cca4187b8dea388f80d48622021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7817https://doaj.org/toc/1996-1073Although operators periodically measure the sludge volume index (SVI) to stabilize the bioreactor and solid–liquid separation during the wastewater treatment process, there is a problem of inconsistency attributed to the subjective judgment of the operator. This study aims to investigate the possibility of securing objective data by employing CdS (cadmium–sulfur) photoresistors for SVI measurements. The sedimentation velocity of settling sludge was measured using LED (Light Emitting Diode) lights at the same level as the installed CdS photoresistors. As a result of the experiment, the settling velocity of sludge in the CdS photoresistors’ installation position H1 to H8 (non-flocculent settling), H9 to H12 (discrete flocculent settling) and H13 to H18 (zone settling and compressive settling), was 0.594 mm/s, 0.180 mm/s and 0.056 mm/s, respectively. Through this study, it was confirmed that measuring sludge sedimentation using the CdS photoresistors is possible. If the measurement of solid matter in sludge using several sludge sedimentation measurements is enabled in the future, it will be possible to develop calculation algorithms to measure the SVI.Seong-Min HongHyun-Ook KimChoong-Gon KimMDPI AGarticleCdS photoresistorsludgesedimentationsettlingSVIdeviceTechnologyTENEnergies, Vol 14, Iss 7817, p 7817 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CdS photoresistor sludge sedimentation settling SVI device Technology T
spellingShingle	CdS photoresistor sludge sedimentation settling SVI device Technology T Seong-Min Hong Hyun-Ook Kim Choong-Gon Kim A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
description	Although operators periodically measure the sludge volume index (SVI) to stabilize the bioreactor and solid–liquid separation during the wastewater treatment process, there is a problem of inconsistency attributed to the subjective judgment of the operator. This study aims to investigate the possibility of securing objective data by employing CdS (cadmium–sulfur) photoresistors for SVI measurements. The sedimentation velocity of settling sludge was measured using LED (Light Emitting Diode) lights at the same level as the installed CdS photoresistors. As a result of the experiment, the settling velocity of sludge in the CdS photoresistors’ installation position H1 to H8 (non-flocculent settling), H9 to H12 (discrete flocculent settling) and H13 to H18 (zone settling and compressive settling), was 0.594 mm/s, 0.180 mm/s and 0.056 mm/s, respectively. Through this study, it was confirmed that measuring sludge sedimentation using the CdS photoresistors is possible. If the measurement of solid matter in sludge using several sludge sedimentation measurements is enabled in the future, it will be possible to develop calculation algorithms to measure the SVI.
format	article
author	Seong-Min Hong Hyun-Ook Kim Choong-Gon Kim
author_facet	Seong-Min Hong Hyun-Ook Kim Choong-Gon Kim
author_sort	Seong-Min Hong
title	A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
title_short	A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
title_full	A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
title_fullStr	A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
title_full_unstemmed	A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors
title_sort	study on the possibility of measuring sludge sedimentation using contrast detection characteristics of cds photoresistors
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/ab2dc2983cca4187b8dea388f80d4862
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A Study on the Possibility of Measuring Sludge Sedimentation Using Contrast Detection Characteristics of CdS Photoresistors

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