Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying.
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| Title: | Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying. |
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| Authors: | Li, Huan1 (AUTHOR) li.huan@sz.tsinghua.edu.cn, Zou, Shuxin1 (AUTHOR), Li, Chenchen1 (AUTHOR) |
| Source: | Drying Technology. Nov2012, Vol. 30 Issue 14, p1563-1569. 7p. 1 Black and White Photograph, 1 Diagram, 4 Graphs. |
| Subjects: | Characterization of sewage sludge, Heat treatment, Drying, Cohesion, Sodium hydroxide |
| Abstract: | In the course of sludge thermal drying, the sludge that sticks to the heated surfaces of drying equipment causes deterioration of drying efficiency and safety. The ability of alkaline pretreatment to reduce sludge build-up on dryer walls during convective drying processes was investigated. The sludge build-up was measured as the residual mass on an iron plate after parts of the sludge were scraped off the plate; the device used simulated the scraping process in drying equipment. The results showed that the sludge build-up on the plate increased at first and then decreased as the sludge water content decreased during thermal drying. The maximum amount of sludge build-up occurred when the sludge water content was about 55–60%. Liming pretreatment enhanced sludge cohesion, hydrolyzed adhesive organic substances, increased the inorganic mineral content of the sludge and, accordingly, reduced sludge build-up. When the dose of Ca(OH)2 was 5% of dry solids (5% DS), the sludge build-up was almost negligible and the average drying rate improved by about 30%. CaO pretreatment was also very effective in preventing sludge build-up, but its effect on the sludge drying rate was not obvious at the same dosage. Compared with Ca(OH)2 and CaO, NaOH did not reduce sludge build-up effectively or improve the sludge drying rate. [ABSTRACT FROM PUBLISHER] |
| Copyright of Drying Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 83369614 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Li%2C+Huan%22">Li, Huan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> li.huan@sz.tsinghua.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Zou%2C+Shuxin%22">Zou, Shuxin</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Li%2C+Chenchen%22">Li, Chenchen</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Drying+Technology%22">Drying Technology</searchLink>. Nov2012, Vol. 30 Issue 14, p1563-1569. 7p. 1 Black and White Photograph, 1 Diagram, 4 Graphs. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Characterization+of+sewage+sludge%22">Characterization of sewage sludge</searchLink><br /><searchLink fieldCode="DE" term="%22Heat+treatment%22">Heat treatment</searchLink><br /><searchLink fieldCode="DE" term="%22Drying%22">Drying</searchLink><br /><searchLink fieldCode="DE" term="%22Cohesion%22">Cohesion</searchLink><br /><searchLink fieldCode="DE" term="%22Sodium+hydroxide%22">Sodium hydroxide</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In the course of sludge thermal drying, the sludge that sticks to the heated surfaces of drying equipment causes deterioration of drying efficiency and safety. The ability of alkaline pretreatment to reduce sludge build-up on dryer walls during convective drying processes was investigated. The sludge build-up was measured as the residual mass on an iron plate after parts of the sludge were scraped off the plate; the device used simulated the scraping process in drying equipment. The results showed that the sludge build-up on the plate increased at first and then decreased as the sludge water content decreased during thermal drying. The maximum amount of sludge build-up occurred when the sludge water content was about 55–60%. Liming pretreatment enhanced sludge cohesion, hydrolyzed adhesive organic substances, increased the inorganic mineral content of the sludge and, accordingly, reduced sludge build-up. When the dose of Ca(OH)2 was 5% of dry solids (5% DS), the sludge build-up was almost negligible and the average drying rate improved by about 30%. CaO pretreatment was also very effective in preventing sludge build-up, but its effect on the sludge drying rate was not obvious at the same dosage. Compared with Ca(OH)2 and CaO, NaOH did not reduce sludge build-up effectively or improve the sludge drying rate. [ABSTRACT FROM PUBLISHER] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Drying Technology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=83369614 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/07373937.2012.697947 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 7 StartPage: 1563 Subjects: – SubjectFull: Characterization of sewage sludge Type: general – SubjectFull: Heat treatment Type: general – SubjectFull: Drying Type: general – SubjectFull: Cohesion Type: general – SubjectFull: Sodium hydroxide Type: general Titles: – TitleFull: Liming Pretreatment Reduces Sludge Build-Up on the Dryer Wall during Thermal Drying. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Li, Huan – PersonEntity: Name: NameFull: Zou, Shuxin – PersonEntity: Name: NameFull: Li, Chenchen IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 11 Text: Nov2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 07373937 Numbering: – Type: volume Value: 30 – Type: issue Value: 14 Titles: – TitleFull: Drying Technology Type: main |
| ResultId | 1 |
