Removal of microplastics from secondary wastewater treatment plant effluent by coagulation/flocculation with iron, aluminum and polyamine-based chemicals
Microplastic (MP) removal by coagulation/flocculation followed by settling was studied in a secondary wastewater treatment plant (WWTP) effluent matrix. MP concentration in size range
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| Veröffentlicht in: | Water research (Oxford) 2020-09, Vol.183, p.116045-116045, Article 116045 |
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| container_title | Water research (Oxford) |
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| creator | Rajala, Katriina Grönfors, Outi Hesampour, Mehrdad Mikola, Anna |
| description | Microplastic (MP) removal by coagulation/flocculation followed by settling was studied in a secondary wastewater treatment plant (WWTP) effluent matrix. MP concentration in size range |
| doi_str_mv | 10.1016/j.watres.2020.116045 |
| format | Article |
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[Display omitted]
•Removal of microplastics less than 10 μm in municipal wastewater was studied.•Coagulation plays a key role in the removal of microplastics from wastewater.•Inorganic coagulants removed more microplastics than organic coagulant.•Flow cytometry suits for quantifying microplastics in wastewater effluent.•Microplastic concentration was up to 22000 times smaller than in previous studies.</description><identifier>ISSN: 0043-1354</identifier><identifier>EISSN: 1879-2448</identifier><identifier>DOI: 10.1016/j.watres.2020.116045</identifier><language>eng</language><publisher>Elsevier Ltd</publisher><subject>Coagulation/flocculation ; Flow cytometry ; Microplastic ; Removal ; Wastewater treatment</subject><ispartof>Water research (Oxford), 2020-09, Vol.183, p.116045-116045, Article 116045</ispartof><rights>2020 Elsevier Ltd</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c385t-e7c2e4a04b4418ecdccf51c5e011c7014738d84f0c13a36615ece4e0a8d76c913</citedby><cites>FETCH-LOGICAL-c385t-e7c2e4a04b4418ecdccf51c5e011c7014738d84f0c13a36615ece4e0a8d76c913</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.watres.2020.116045$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Rajala, Katriina</creatorcontrib><creatorcontrib>Grönfors, Outi</creatorcontrib><creatorcontrib>Hesampour, Mehrdad</creatorcontrib><creatorcontrib>Mikola, Anna</creatorcontrib><title>Removal of microplastics from secondary wastewater treatment plant effluent by coagulation/flocculation with iron, aluminum and polyamine-based chemicals</title><title>Water research (Oxford)</title><description>Microplastic (MP) removal by coagulation/flocculation followed by settling was studied in a secondary wastewater treatment plant (WWTP) effluent matrix. MP concentration in size range <10 µm in wastewater is currently unknown due to the exclusion of this size range in many studies and due to difficulties in MP quantification. WWTP effluent samples were spiked with a known amount of polystyrene spheres of two different sizes 1 µm and 6.3 µm. The samples were treated with inorganic and organic coagulants typically used in WWTPs, i.e., ferric chloride, polyaluminum chloride, and polyamine. The effect of pH was studied with ferric chloride by changing the pH from 7.3 to 6.5. In this study, MP removal was monitored using flow cytometry. The role of chemicals in MP removal at WWTPs has not been in the focus of previously reported MP studies. Our results showed that all tested coagulants enhanced the removal of MPs with dosages applicable to tertiary treatment. The highest removal efficiency obtained was 99.4%, and ferric chloride and polyaluminum chloride were more efficient than polyamine. Performances of ferric chloride and polyaluminum chloride were close to each other, with a statistically significant difference at a certain dosage range. Our findings suggest that chemical coagulation plays a key role in the removal of MPs, and the process can be optimized by selecting the right coagulant and pH.
[Display omitted]
•Removal of microplastics less than 10 μm in municipal wastewater was studied.•Coagulation plays a key role in the removal of microplastics from wastewater.•Inorganic coagulants removed more microplastics than organic coagulant.•Flow cytometry suits for quantifying microplastics in wastewater effluent.•Microplastic concentration was up to 22000 times smaller than in previous studies.</description><subject>Coagulation/flocculation</subject><subject>Flow cytometry</subject><subject>Microplastic</subject><subject>Removal</subject><subject>Wastewater treatment</subject><issn>0043-1354</issn><issn>1879-2448</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNp9UU1rGzEQFaWFum7-QQ865pB1pJW0H5dCMfkoBAqlPQt5dtTIaFeOpLXxT8m_jczm3MsMb3gzb2YeId8423DGm9v95mRyxLSpWV1KvGFSfSAr3rV9VUvZfSQrxqSouFDyM_mS0p4xVteiX5HX3ziGo_E0WDo6iOHgTcoOErUxjDQhhGkw8UxPpYxFBiMtUiaPOGVayCWitX6-wN2ZQjD_Zm-yC9Ot9QHgHdCTy8_UxTDdUOPn0U3zSM000EPwZ1MgVjuTcKDwjGUP49NX8smWhFfveU3-3t_92T5WT78efm5_PFUgOpUrbKFGaZjcSck7hAHAKg4KGefQMi5b0Q2dtAy4MKJpuEJAicx0Q9tAz8WaXC9zDzG8zJiyHl0C9OU0DHPStRR1p1Tbq0KVC7X8KaWIVh-iG8t3NGf64oTe68UJfXFCL06Utu9LG5Yzjg6jTuBwAhxcRMh6CO7_A94AboCYxg</recordid><startdate>20200915</startdate><enddate>20200915</enddate><creator>Rajala, Katriina</creator><creator>Grönfors, Outi</creator><creator>Hesampour, Mehrdad</creator><creator>Mikola, Anna</creator><general>Elsevier Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope></search><sort><creationdate>20200915</creationdate><title>Removal of microplastics from secondary wastewater treatment plant effluent by coagulation/flocculation with iron, aluminum and polyamine-based chemicals</title><author>Rajala, Katriina ; Grönfors, Outi ; Hesampour, Mehrdad ; Mikola, Anna</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c385t-e7c2e4a04b4418ecdccf51c5e011c7014738d84f0c13a36615ece4e0a8d76c913</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Coagulation/flocculation</topic><topic>Flow cytometry</topic><topic>Microplastic</topic><topic>Removal</topic><topic>Wastewater treatment</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Rajala, Katriina</creatorcontrib><creatorcontrib>Grönfors, Outi</creatorcontrib><creatorcontrib>Hesampour, Mehrdad</creatorcontrib><creatorcontrib>Mikola, Anna</creatorcontrib><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><jtitle>Water research (Oxford)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Rajala, Katriina</au><au>Grönfors, Outi</au><au>Hesampour, Mehrdad</au><au>Mikola, Anna</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Removal of microplastics from secondary wastewater treatment plant effluent by coagulation/flocculation with iron, aluminum and polyamine-based chemicals</atitle><jtitle>Water research (Oxford)</jtitle><date>2020-09-15</date><risdate>2020</risdate><volume>183</volume><spage>116045</spage><epage>116045</epage><pages>116045-116045</pages><artnum>116045</artnum><issn>0043-1354</issn><eissn>1879-2448</eissn><abstract>Microplastic (MP) removal by coagulation/flocculation followed by settling was studied in a secondary wastewater treatment plant (WWTP) effluent matrix. MP concentration in size range <10 µm in wastewater is currently unknown due to the exclusion of this size range in many studies and due to difficulties in MP quantification. WWTP effluent samples were spiked with a known amount of polystyrene spheres of two different sizes 1 µm and 6.3 µm. The samples were treated with inorganic and organic coagulants typically used in WWTPs, i.e., ferric chloride, polyaluminum chloride, and polyamine. The effect of pH was studied with ferric chloride by changing the pH from 7.3 to 6.5. In this study, MP removal was monitored using flow cytometry. The role of chemicals in MP removal at WWTPs has not been in the focus of previously reported MP studies. Our results showed that all tested coagulants enhanced the removal of MPs with dosages applicable to tertiary treatment. The highest removal efficiency obtained was 99.4%, and ferric chloride and polyaluminum chloride were more efficient than polyamine. Performances of ferric chloride and polyaluminum chloride were close to each other, with a statistically significant difference at a certain dosage range. Our findings suggest that chemical coagulation plays a key role in the removal of MPs, and the process can be optimized by selecting the right coagulant and pH.
[Display omitted]
•Removal of microplastics less than 10 μm in municipal wastewater was studied.•Coagulation plays a key role in the removal of microplastics from wastewater.•Inorganic coagulants removed more microplastics than organic coagulant.•Flow cytometry suits for quantifying microplastics in wastewater effluent.•Microplastic concentration was up to 22000 times smaller than in previous studies.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.watres.2020.116045</doi><tpages>1</tpages><oa>free_for_read</oa></addata></record> |
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| subjects | Coagulation/flocculation Flow cytometry Microplastic Removal Wastewater treatment |
| title | Removal of microplastics from secondary wastewater treatment plant effluent by coagulation/flocculation with iron, aluminum and polyamine-based chemicals |
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