{"id":{"repo_id":"wustl","oai_identifier":"oai:openscholarship.wustl.edu:eng_etds-1591"},"canonical_url":"https://search.dev.ndltd.org/etd/wustl/oai:openscholarship.wustl.edu:eng_etds-1591","repository":{"repo_id":"wustl","name":"Washington University in St. Louis","base_url":"https://openscholarship.wustl.edu/do/oai/"},"display":{"title":"A Thesis on the Interactions between Lead Pipe Scales and Dissolved Silica from the Addition of Sodium Silicate as a Corrosion Inhibitor","abstract":"Ingestion of lead-contaminated drinking water is one of the major pathways for human exposure to lead. Addition of sodium silicate can potentially control lead release from lead service lines (LSLs) to the water that they convey, but the mechanism of silica uptake and corrosion control have not been reported. Knowledge of variables which affect the uptake of dissolved silica and the consumption rate of added sodium silicate by scales of corrosion products that are present on lead service lines will be useful to water utilities and distribution systems. This study investigated the effects of pH, initial silica concentration and mass of scales on the rates and extents of silica uptake by real scales removed from lead service lines and by hydrocerussite, which is one of the dominant lead-containing solids found in such scales. The study used batch experiments with these solid phases at environmentally relevant water chemistry conditions. Statistic models were built for different conditions to fit experimental data, a biphasic model was found to fit the data well. Adsorption is a potential process of silica uptake, and adsorption isotherms were plotted in this study to observe the behavior of hydrocerussite and Buffalo scales during the uptake of dissolved silica. Other processes and possible reactions were also hypothesized to evaluate their role in the uptake of silica.","abstract_html":"Ingestion of lead-contaminated drinking water is one of the major pathways for human exposure to lead. Addition of sodium silicate can potentially control lead release from lead service lines (LSLs) to the water that they convey, but the mechanism of silica uptake and corrosion control have not been reported. Knowledge of variables which affect the uptake of dissolved silica and the consumption rate of added sodium silicate by scales of corrosion products that are present on lead service lines will be useful to water utilities and distribution systems. This study investigated the effects of pH, initial silica concentration and mass of scales on the rates and extents of silica uptake by real scales removed from lead service lines and by hydrocerussite, which is one of the dominant lead-containing solids found in such scales. The study used batch experiments with these solid phases at environmentally relevant water chemistry conditions. Statistic models were built for different conditions to fit experimental data, a biphasic model was found to fit the data well. Adsorption is a potential process of silica uptake, and adsorption isotherms were plotted in this study to observe the behavior of hydrocerussite and Buffalo scales during the uptake of dissolved silica. Other processes and possible reactions were also hypothesized to evaluate their role in the uptake of silica.","abstract_has_math":false,"creators":["Wang, Ziqi"],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Energy, Environmental & Chemical Engineering","degree_department":null,"school":null,"contributors":["Dr. Daniel Giammar","Dr. Young-Shin Jun Dr. Kimberly Parker"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2020,"date_issued":"2020-08-14T07:00:00Z","date_published":"2020-08-14T07:00:00Z","updated_at":"2026-07-24T06:13:31Z","subjects":["Sodium silicate","adsorption","lead pipe scales","hydrocerussite","corrosion inhibition","Engineering"],"languages":["English (en)"],"rights":["I have not registered my thesis with the U.S. Copyright Office, and do not intend to."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://openscholarship.wustl.edu/eng_etds/687"],"render_values":[{"text":"https://openscholarship.wustl.edu/eng_etds/687","href":"https://openscholarship.wustl.edu/eng_etds/687","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.7936/xfve-h761","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Dr. Daniel Giammar","Dr. Young-Shin Jun Dr. Kimberly Parker"]},{"key":"dc:creator","label":"Author","values":["Wang, Ziqi"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.available","label":"Dc Date Available","values":["2021-05-29T07:00:00Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Energy, Environmental & Chemical Engineering","McKelvey School of Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sodium silicate","adsorption","lead pipe scales","hydrocerussite","corrosion inhibition","Engineering"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English (en)"]},{"key":"dc:rights","label":"Dc Rights","values":["I have not registered my thesis with the U.S. Copyright Office, and do not intend to."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://doi.org/10.7936/xfve-h761","https://openscholarship.wustl.edu/eng_etds/687"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Ingestion of lead-contaminated drinking water is one of the major pathways for human exposure to lead. Addition of sodium silicate can potentially control lead release from lead service lines (LSLs) to the water that they convey, but the mechanism of silica uptake and corrosion control have not been reported. Knowledge of variables which affect the uptake of dissolved silica and the consumption rate of added sodium silicate by scales of corrosion products that are present on lead service lines will be useful to water utilities and distribution systems. This study investigated the effects of pH, initial silica concentration and mass of scales on the rates and extents of silica uptake by real scales removed from lead service lines and by hydrocerussite, which is one of the dominant lead-containing solids found in such scales. The study used batch experiments with these solid phases at environmentally relevant water chemistry conditions. Statistic models were built for different conditions to fit experimental data, a biphasic model was found to fit the data well. Adsorption is a potential process of silica uptake, and adsorption isotherms were plotted in this study to observe the behavior of hydrocerussite and Buffalo scales during the uptake of dissolved silica. Other processes and possible reactions were also hypothesized to evaluate their role in the uptake of silica."]},{"key":"dc:title","label":"Title","values":["A Thesis on the Interactions between Lead Pipe Scales and Dissolved Silica from the Addition of Sodium Silicate as a Corrosion Inhibitor"]}]}],"canonical_facts":{"dc:contributor":["Dr. Daniel Giammar","Dr. Young-Shin Jun Dr. Kimberly Parker"],"dc:creator":["Wang, Ziqi"],"dc:date.available":["2021-05-29T07:00:00Z"],"dc:description.abstract":["Ingestion of lead-contaminated drinking water is one of the major pathways for human exposure to lead. Addition of sodium silicate can potentially control lead release from lead service lines (LSLs) to the water that they convey, but the mechanism of silica uptake and corrosion control have not been reported. Knowledge of variables which affect the uptake of dissolved silica and the consumption rate of added sodium silicate by scales of corrosion products that are present on lead service lines will be useful to water utilities and distribution systems. This study investigated the effects of pH, initial silica concentration and mass of scales on the rates and extents of silica uptake by real scales removed from lead service lines and by hydrocerussite, which is one of the dominant lead-containing solids found in such scales. The study used batch experiments with these solid phases at environmentally relevant water chemistry conditions. Statistic models were built for different conditions to fit experimental data, a biphasic model was found to fit the data well. Adsorption is a potential process of silica uptake, and adsorption isotherms were plotted in this study to observe the behavior of hydrocerussite and Buffalo scales during the uptake of dissolved silica. Other processes and possible reactions were also hypothesized to evaluate their role in the uptake of silica."],"dc:identifier":["https://doi.org/10.7936/xfve-h761","https://openscholarship.wustl.edu/eng_etds/687"],"dc:language":["English (en)"],"dc:rights":["I have not registered my thesis with the U.S. Copyright Office, and do not intend to."],"dc:subject":["Sodium silicate","adsorption","lead pipe scales","hydrocerussite","corrosion inhibition","Engineering"],"dc:title":["A Thesis on the Interactions between Lead Pipe Scales and Dissolved Silica from the Addition of Sodium Silicate as a Corrosion Inhibitor"],"thesis:degree_discipline":["Energy, Environmental & Chemical Engineering","McKelvey School of Engineering"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T06:13:31Z"}