Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal
In this study, a simple to produce, low-cost and environment-friendly sludge based adsorbent, prepared from municipal dewatered sludge and modified by calcium oxide (CaO), is described. The enhancement effect of CaO modification on the adsorption capacity and mechanical strength of sludge based adso...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Elsevier
2021-02-01
|
Series: | Ecotoxicology and Environmental Safety |
Subjects: | |
Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651320315967 |
id |
doaj-7a9fda3ef71243b4848bcef84f16a2ed |
---|---|
record_format |
Article |
spelling |
doaj-7a9fda3ef71243b4848bcef84f16a2ed2021-04-23T06:15:17ZengElsevierEcotoxicology and Environmental Safety0147-65132021-02-01209111760Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removalHaiqi Gu0Weixiong Lin1Shuiyu Sun2Chun Wu3Fan Yang4Ye Ziwei5Nanwei Chen6Jie Ren7Shilin Zheng8School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, ChinaSchool of Environmental and Chemical Engineering, Zhaoqing University, Zhaoqing 526061, China; Corresponding author.School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Guangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, China; Corresponding author at: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.Guangdong Yuanquan Testing Technology Co., Ltd., Foshan 528225, ChinaGuangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, ChinaGuangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, ChinaGuangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, ChinaGuangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, ChinaGuangdong Polytechnic of Environmental Protection Engineering, Foshan 528216, ChinaIn this study, a simple to produce, low-cost and environment-friendly sludge based adsorbent, prepared from municipal dewatered sludge and modified by calcium oxide (CaO), is described. The enhancement effect of CaO modification on the adsorption capacity and mechanical strength of sludge based adsorbents (CaO-SA), and the modification mechanism of CaO on activated sludge are discussed. Also, the Cd(II) adsorption conditions are optimized using surface optimization experiment. The results indicated that CaO had a good effect on improving the adsorption capacity and mechanical strength of the sludge-based adsorbent. The CaO-SA adsorbent showed best performance with respect to the mechanical strength and Cd(II) adsorption capacity when prepared under 5% CaO dosage and 60 °C drying temperature. CaO modification can increase the specific surface area and calcium ion content of the sludge–based adsorbent and remove the proton of the carboxylic acid in the sludge. The Box-Behnken experimental design results revealed that the importance of operating conditions for CaO-SA adsorption of Cd(II) can be arranged in the order of adsorption time > dosage> pH> temperature. The results also indicated that the interactions between adsorption time and CaO-SA dosage, adsorption time and pH, adsorption time and temperature are all important factors affecting the Cd(II) adsorption. The optimal conditions (adsorption time of 90 min, CaO-SA dosage of 1 g/L, pH of 5 and adsorption temperature of 40 °C) for CaO-SA to adsorb Cd(II) were obtained by surface optimization, at which the Cd(II) adsorption rate could reach a value of 99.74%.http://www.sciencedirect.com/science/article/pii/S0147651320315967Dewatered sludgeCadmiumBio-sorbentCalcium oxide modificationBox-Behnken response surface |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Haiqi Gu Weixiong Lin Shuiyu Sun Chun Wu Fan Yang Ye Ziwei Nanwei Chen Jie Ren Shilin Zheng |
spellingShingle |
Haiqi Gu Weixiong Lin Shuiyu Sun Chun Wu Fan Yang Ye Ziwei Nanwei Chen Jie Ren Shilin Zheng Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal Ecotoxicology and Environmental Safety Dewatered sludge Cadmium Bio-sorbent Calcium oxide modification Box-Behnken response surface |
author_facet |
Haiqi Gu Weixiong Lin Shuiyu Sun Chun Wu Fan Yang Ye Ziwei Nanwei Chen Jie Ren Shilin Zheng |
author_sort |
Haiqi Gu |
title |
Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal |
title_short |
Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal |
title_full |
Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal |
title_fullStr |
Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal |
title_full_unstemmed |
Calcium oxide modification of activated sludge as a low-cost adsorbent: Preparation and application in Cd(II) removal |
title_sort |
calcium oxide modification of activated sludge as a low-cost adsorbent: preparation and application in cd(ii) removal |
publisher |
Elsevier |
series |
Ecotoxicology and Environmental Safety |
issn |
0147-6513 |
publishDate |
2021-02-01 |
description |
In this study, a simple to produce, low-cost and environment-friendly sludge based adsorbent, prepared from municipal dewatered sludge and modified by calcium oxide (CaO), is described. The enhancement effect of CaO modification on the adsorption capacity and mechanical strength of sludge based adsorbents (CaO-SA), and the modification mechanism of CaO on activated sludge are discussed. Also, the Cd(II) adsorption conditions are optimized using surface optimization experiment. The results indicated that CaO had a good effect on improving the adsorption capacity and mechanical strength of the sludge-based adsorbent. The CaO-SA adsorbent showed best performance with respect to the mechanical strength and Cd(II) adsorption capacity when prepared under 5% CaO dosage and 60 °C drying temperature. CaO modification can increase the specific surface area and calcium ion content of the sludge–based adsorbent and remove the proton of the carboxylic acid in the sludge. The Box-Behnken experimental design results revealed that the importance of operating conditions for CaO-SA adsorption of Cd(II) can be arranged in the order of adsorption time > dosage> pH> temperature. The results also indicated that the interactions between adsorption time and CaO-SA dosage, adsorption time and pH, adsorption time and temperature are all important factors affecting the Cd(II) adsorption. The optimal conditions (adsorption time of 90 min, CaO-SA dosage of 1 g/L, pH of 5 and adsorption temperature of 40 °C) for CaO-SA to adsorb Cd(II) were obtained by surface optimization, at which the Cd(II) adsorption rate could reach a value of 99.74%. |
topic |
Dewatered sludge Cadmium Bio-sorbent Calcium oxide modification Box-Behnken response surface |
url |
http://www.sciencedirect.com/science/article/pii/S0147651320315967 |
work_keys_str_mv |
AT haiqigu calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT weixionglin calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT shuiyusun calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT chunwu calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT fanyang calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT yeziwei calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT nanweichen calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT jieren calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval AT shilinzheng calciumoxidemodificationofactivatedsludgeasalowcostadsorbentpreparationandapplicationincdiiremoval |
_version_ |
1721513087626903552 |