Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses

The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of...
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Autor*in:	Yu Cheng [verfasserIn] Kangmin Chon [verfasserIn] Xianghao Ren [verfasserIn] Meiling Li [verfasserIn] Yingying Kou [verfasserIn] Moon-Hyun Hwang [verfasserIn] Kyu-Jung Chae [verfasserIn]

Format:	E-Artikel
Sprache:	Englisch

Erschienen:	2021

Schlagwörter:	analytic hierarchy process modelling heavy metals modified bentonite nutrients sewage sludge

Übergeordnetes Werk:	In: Water Science and Technology - IWA Publishing, 2021, 84(2021), 9, Seite 2252-2264
Übergeordnetes Werk:	volume:84 ; year:2021 ; number:9 ; pages:2252-2264

Links:	Link aufrufen Link aufrufen Link aufrufen Journal toc Journal toc

DOI / URN:	10.2166/wst.2021.450

Katalog-ID:	DOAJ066980534

Internformat


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520			\|a The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of nutrient species (i.e., total nitrogen (TN), total phosphorus (TP), available nitrogen (available N), and Olsen-phosphorus (Olsen-P)) in sewage sludge for agricultural use. Five grams of modified bentonite resulted in the highest stabilisation rate of heavy metals and strongly contributed to the stabilisation of heavy metals. However, increased amounts of modified bentonite might increase the TN, available N, and TP losses in the conditioned sewage sludge. Through the analytic hierarchy process modelling, optimal concentrations of nutrient species and heavy metals remaining in the conditioned sewage sludge were achieved when the ratio of bentonite to sewage sludge was 1:12.5 (4 g bentonite : 50 g sludge). Moreover, the optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use. Based on these observations, modified bentonite allowed the sewage sludge to be used as a fertiliser in agriculture by stabilising heavy metals and retaining nutrient species. HIGHLIGHTS The modified bentonite stabilised the heavy metals and retained the nutrient elements in the sewage sludge.; The AHP modelling revealed the optimal ratio of bentonite to sewage sludge (4 g bentonite : 50 g sludge).; The optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use.; The modified bentonite allowed sewage sludge to be used as a fertiliser in agriculture.;
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language	English
source	In Water Science and Technology 84(2021), 9, Seite 2252-2264 volume:84 year:2021 number:9 pages:2252-2264
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callnumber-first	T - Technology
author	Yu Cheng
spellingShingle	Yu Cheng misc TD1-1066 misc analytic hierarchy process modelling misc heavy metals misc modified bentonite misc nutrients misc sewage sludge misc Environmental technology. Sanitary engineering Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
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topic_title	TD1-1066 Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses analytic hierarchy process modelling heavy metals modified bentonite nutrients sewage sludge
topic	misc TD1-1066 misc analytic hierarchy process modelling misc heavy metals misc modified bentonite misc nutrients misc sewage sludge misc Environmental technology. Sanitary engineering
topic_unstemmed	misc TD1-1066 misc analytic hierarchy process modelling misc heavy metals misc modified bentonite misc nutrients misc sewage sludge misc Environmental technology. Sanitary engineering
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title	Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
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title_full	Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
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title_sort	modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
callnumber	TD1-1066
title_auth	Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
abstract	The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of nutrient species (i.e., total nitrogen (TN), total phosphorus (TP), available nitrogen (available N), and Olsen-phosphorus (Olsen-P)) in sewage sludge for agricultural use. Five grams of modified bentonite resulted in the highest stabilisation rate of heavy metals and strongly contributed to the stabilisation of heavy metals. However, increased amounts of modified bentonite might increase the TN, available N, and TP losses in the conditioned sewage sludge. Through the analytic hierarchy process modelling, optimal concentrations of nutrient species and heavy metals remaining in the conditioned sewage sludge were achieved when the ratio of bentonite to sewage sludge was 1:12.5 (4 g bentonite : 50 g sludge). Moreover, the optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use. Based on these observations, modified bentonite allowed the sewage sludge to be used as a fertiliser in agriculture by stabilising heavy metals and retaining nutrient species. HIGHLIGHTS The modified bentonite stabilised the heavy metals and retained the nutrient elements in the sewage sludge.; The AHP modelling revealed the optimal ratio of bentonite to sewage sludge (4 g bentonite : 50 g sludge).; The optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use.; The modified bentonite allowed sewage sludge to be used as a fertiliser in agriculture.;
abstractGer	The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of nutrient species (i.e., total nitrogen (TN), total phosphorus (TP), available nitrogen (available N), and Olsen-phosphorus (Olsen-P)) in sewage sludge for agricultural use. Five grams of modified bentonite resulted in the highest stabilisation rate of heavy metals and strongly contributed to the stabilisation of heavy metals. However, increased amounts of modified bentonite might increase the TN, available N, and TP losses in the conditioned sewage sludge. Through the analytic hierarchy process modelling, optimal concentrations of nutrient species and heavy metals remaining in the conditioned sewage sludge were achieved when the ratio of bentonite to sewage sludge was 1:12.5 (4 g bentonite : 50 g sludge). Moreover, the optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use. Based on these observations, modified bentonite allowed the sewage sludge to be used as a fertiliser in agriculture by stabilising heavy metals and retaining nutrient species. HIGHLIGHTS The modified bentonite stabilised the heavy metals and retained the nutrient elements in the sewage sludge.; The AHP modelling revealed the optimal ratio of bentonite to sewage sludge (4 g bentonite : 50 g sludge).; The optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use.; The modified bentonite allowed sewage sludge to be used as a fertiliser in agriculture.;
abstract_unstemmed	The management and disposal of excess sludge are emerging issues owing to the high costs associated with treatment. In this study, the viability of a modified bentonite was investigated as a conditioning agent for the stabilisation of heavy metals (i.e., Cu, Zn, Cr, Pb, and Cd) and the retention of nutrient species (i.e., total nitrogen (TN), total phosphorus (TP), available nitrogen (available N), and Olsen-phosphorus (Olsen-P)) in sewage sludge for agricultural use. Five grams of modified bentonite resulted in the highest stabilisation rate of heavy metals and strongly contributed to the stabilisation of heavy metals. However, increased amounts of modified bentonite might increase the TN, available N, and TP losses in the conditioned sewage sludge. Through the analytic hierarchy process modelling, optimal concentrations of nutrient species and heavy metals remaining in the conditioned sewage sludge were achieved when the ratio of bentonite to sewage sludge was 1:12.5 (4 g bentonite : 50 g sludge). Moreover, the optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use. Based on these observations, modified bentonite allowed the sewage sludge to be used as a fertiliser in agriculture by stabilising heavy metals and retaining nutrient species. HIGHLIGHTS The modified bentonite stabilised the heavy metals and retained the nutrient elements in the sewage sludge.; The AHP modelling revealed the optimal ratio of bentonite to sewage sludge (4 g bentonite : 50 g sludge).; The optimal mixing ratio of the conditioned sewage sludge to the soil (1:2) was suggested for agricultural use.; The modified bentonite allowed sewage sludge to be used as a fertiliser in agriculture.;
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title_short	Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses
url	https://doi.org/10.2166/wst.2021.450 https://doaj.org/article/3972e8007c664ef4822c9214da91811d http://wst.iwaponline.com/content/84/9/2252 https://doaj.org/toc/0273-1223 https://doaj.org/toc/1996-9732
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up_date	2024-07-03T22:59:12.577Z
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Modified bentonite as a conditioning agent for stabilising heavy metals and retaining nutrients in sewage sludge for agricultural uses

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