Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality
We investigated the effects of ultrasound-assisted ethylenediaminetetraacetic acid (EDTA) and citric acid (CA) washing on heavy metal (HM) removal, residual HM mobility, and sewage sludge quality. EDTA and CA washing of sewage sludge successfully reduced the total concentration of HMs after one roun...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2023-09-01
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| Series: | Water Science and Technology |
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| Online Access: | http://wst.iwaponline.com/content/88/6/1594 |
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| author | Hongpei Lu Yonggui Wu Youfa Luo Ziran Li Ziqi Wang Xiaoyu Peng Yibin Qiang |
| author_facet | Hongpei Lu Yonggui Wu Youfa Luo Ziran Li Ziqi Wang Xiaoyu Peng Yibin Qiang |
| author_sort | Hongpei Lu |
| collection | DOAJ |
| description | We investigated the effects of ultrasound-assisted ethylenediaminetetraacetic acid (EDTA) and citric acid (CA) washing on heavy metal (HM) removal, residual HM mobility, and sewage sludge quality. EDTA and CA washing of sewage sludge successfully reduced the total concentration of HMs after one round of washing, but the mobility of residual HMs increased significantly. The eluate had a high concentration of HMs and nutrients (nitrogen, phosphorus, potassium, and total organic carbon), although the nutritional content of the sludge remained high. The three-phase ratio of the sludge after six rounds of washing by CA was closest to the ideal three-phase ratio, and the degree of influence on the physical structure of the soil after a land application was reduced, according to the fluctuation of generalized soil structure index (GSSI) and soil three-phase structure distance (STPSD) values. The results indicate that CA as an environmental-friendly washing agent can be the superior choice for sludge HM washing; single washing of sewage sludge may increase the mobility of residual HMs, so multiple washings should be considered for land application of sludge.
HIGHLIGHTS
Ultrasound-assisted chemical washing is a useful and efficient solution to remove HMs from sewage sludge.;
The higher concentration (≥0.4 M) of biodegradable CA eluent could effectively reduce HMs in the sewage sludge compared to the traditional non-biodegradable EDTA eluent.; |
| first_indexed | 2024-03-11T18:42:53Z |
| format | Article |
| id | doaj.art-899d126aecd642fb8d4c7f8ca0a1e1c9 |
| institution | Directory Open Access Journal |
| issn | 0273-1223 1996-9732 |
| language | English |
| last_indexed | 2024-03-11T18:42:53Z |
| publishDate | 2023-09-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Water Science and Technology |
| spelling | doaj.art-899d126aecd642fb8d4c7f8ca0a1e1c92023-10-12T07:49:42ZengIWA PublishingWater Science and Technology0273-12231996-97322023-09-018861594160710.2166/wst.2023.289289Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge qualityHongpei Lu0Yonggui Wu1Youfa Luo2Ziran Li3Ziqi Wang4Xiaoyu Peng5Yibin Qiang6 College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China Guizhou Kast Environmental Ecosystem Observation and Research Station, Ministry of Education, Guiyang 550025, China College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China College of Resource and Environmental Engineering, Guizhou University, Guiyang 550025, China We investigated the effects of ultrasound-assisted ethylenediaminetetraacetic acid (EDTA) and citric acid (CA) washing on heavy metal (HM) removal, residual HM mobility, and sewage sludge quality. EDTA and CA washing of sewage sludge successfully reduced the total concentration of HMs after one round of washing, but the mobility of residual HMs increased significantly. The eluate had a high concentration of HMs and nutrients (nitrogen, phosphorus, potassium, and total organic carbon), although the nutritional content of the sludge remained high. The three-phase ratio of the sludge after six rounds of washing by CA was closest to the ideal three-phase ratio, and the degree of influence on the physical structure of the soil after a land application was reduced, according to the fluctuation of generalized soil structure index (GSSI) and soil three-phase structure distance (STPSD) values. The results indicate that CA as an environmental-friendly washing agent can be the superior choice for sludge HM washing; single washing of sewage sludge may increase the mobility of residual HMs, so multiple washings should be considered for land application of sludge. HIGHLIGHTS Ultrasound-assisted chemical washing is a useful and efficient solution to remove HMs from sewage sludge.; The higher concentration (≥0.4 M) of biodegradable CA eluent could effectively reduce HMs in the sewage sludge compared to the traditional non-biodegradable EDTA eluent.;http://wst.iwaponline.com/content/88/6/1594citric acidethylenediaminetetraacetic acidheavy metalssewage sludge washingsludge qualityultrasound |
| spellingShingle | Hongpei Lu Yonggui Wu Youfa Luo Ziran Li Ziqi Wang Xiaoyu Peng Yibin Qiang Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality Water Science and Technology citric acid ethylenediaminetetraacetic acid heavy metals sewage sludge washing sludge quality ultrasound |
| title | Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality |
| title_full | Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality |
| title_fullStr | Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality |
| title_full_unstemmed | Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality |
| title_short | Effect of ultrasound-assisted EDTA and citric acid washing on heavy metal removal, residual heavy metal mobility, and sewage sludge quality |
| title_sort | effect of ultrasound assisted edta and citric acid washing on heavy metal removal residual heavy metal mobility and sewage sludge quality |
| topic | citric acid ethylenediaminetetraacetic acid heavy metals sewage sludge washing sludge quality ultrasound |
| url | http://wst.iwaponline.com/content/88/6/1594 |
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