Anesthetic gas plant wastewater (AGPW) contains high concentrations of ammonia (NH3-N) and sulphate ions, which is known to results in severe environmental pollution in aquatic ecosystems without treatment. In the first stage of this study, a lab-scale investigation was done to improve removal of ammonia from AGPW by air stripping and struvite (or MAP: magnesium ammonium phosphate) precipitation processes, separately. The main operating parameters such as pH, air flow rate (L/min) and operating time were optimized for air stripping. The theoretical amount of removed ammonia via the air stripping process was calculated. The NH3-N removal efficiency reached 94 ?t pH 12. On the other hand, the optimum ratio of [Mg2 ]: [NH4 ]: [PO43-] was determined to be 1:1.1:1.8 for the struvite precipitation. The concentration of NH3-N was reduced from 10,600 to 1680 mg/L at pH 8.0 and the corresponding removal efficiency was 84 ?t optimum ration of MAP. The solution remained after the struvite precipitation was reacted with Ca(OH)(2) at pH values in the range 10-13 for removal of sulphate in the second stage. The removal efficiencies at the optimum conditions were 98 ?or sulphate, 31 ?or COD and 20 ?or TOC. Air stripping process and struvite precipitation could be considered an effective technology for removal and recovery of ammonia or ammonium ion (NH4 -N) from the AGPW. Surface analyses of the precipitated samples were characterized by SEM and XRD.
Название публикации (dc.title) | Ammonia removal from wastewater by air stripping and recovery struvite and calcium sulphate precipitations from anesthetic gases manufacturing wastewater |
Автор/ы (dc.contributor.yazarlar) | Feride Ulu, Mehmet Kobya |
Вид публикации (dc.type) | Makale |
Язык (dc.language) | İngilizce |
Год публикации (dc.date.issued) | 2020 |
Национальный/Международный (dc.identifier.ulusaluluslararasi) | Uluslararası |
Источник (dc.relation.journal) | Journal of Water Process Engineering |
Том/№ (dc.identifier.volume) | 38 |
Страница (dc.identifier.startpage) | Article Number: 101641 |
ISSN/ISBN (dc.identifier.issn) | ISSN: 2214-7144 |
Издатель (dc.publisher) | Elsevier |
Базы данных (dc.contributor.veritaban) | Web of Science Core Collection |
Базы данных (dc.contributor.veritaban) | Sciencedirect |
Базы данных (dc.contributor.veritaban) | Scopus |
Вид индекса (dc.identifier.index) | SCI Expanded |
Вид индекса (dc.identifier.index) | Scopus |
Импакт-фактор (dc.identifier.etkifaktoru) | 3,465 / 2019-WOS / 5 Year: 4,116 |
Резюме (dc.description.abstract) | Anesthetic gas plant wastewater (AGPW) contains high concentrations of ammonia (NH3-N) and sulphate ions, which is known to results in severe environmental pollution in aquatic ecosystems without treatment. In the first stage of this study, a lab-scale investigation was done to improve removal of ammonia from AGPW by air stripping and struvite (or MAP: magnesium ammonium phosphate) precipitation processes, separately. The main operating parameters such as pH, air flow rate (L/min) and operating time were optimized for air stripping. The theoretical amount of removed ammonia via the air stripping process was calculated. The NH3-N removal efficiency reached 94 ?t pH 12. On the other hand, the optimum ratio of [Mg2 ]: [NH4 ]: [PO43-] was determined to be 1:1.1:1.8 for the struvite precipitation. The concentration of NH3-N was reduced from 10,600 to 1680 mg/L at pH 8.0 and the corresponding removal efficiency was 84 ?t optimum ration of MAP. The solution remained after the struvite precipitation was reacted with Ca(OH)(2) at pH values in the range 10-13 for removal of sulphate in the second stage. The removal efficiencies at the optimum conditions were 98 ?or sulphate, 31 ?or COD and 20 ?or TOC. Air stripping process and struvite precipitation could be considered an effective technology for removal and recovery of ammonia or ammonium ion (NH4 -N) from the AGPW. Surface analyses of the precipitated samples were characterized by SEM and XRD. |
URL (dc.rights) | https://www.sciencedirect.com/science/article/abs/pii/S2214714420305195?via=ihub |
DOI (dc.identifier.doi) | 10.1016/j.jwpe.2020.101641 |
Факультет / Институт (dc.identifier.fakulte) | Mühendislik Fakültesi |
Кафедра (dc.identifier.bolum) | Çevre Mühendisliği Bölümü |
Автор(ы) в учреждении (dc.contributor.author) | Mehmet KOBYA |
№ регистрации (dc.identifier.kayitno) | BL5D60EDB7 |
Дата регистрации (dc.date.available) | 2021-01-15 |
Заметка (Год публикации) (dc.identifier.notyayinyili) | December 2020 |
Wos No (dc.identifier.wos) | WOS:000598150200008 |
Тематический рубрикатор (dc.subject) | anesthetic gas plant wastewater |
Тематический рубрикатор (dc.subject) | magnesium ammonium phosphate |
Тематический рубрикатор (dc.subject) | precipitation |
Тематический рубрикатор (dc.subject) | ammonia stripping |
Тематический рубрикатор (dc.subject) | sulphate removal |