Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH
Abstract This study investigated the frequent blockages observed in the discharge pipeline in the chemical mechanical polishing wastewater treatment plant. Preliminary analyses indicated that blockages were predominantly consisted of residual organically-bounded Al due to overdosage of polyaluminum...
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| Format: | Article |
| Language: | English |
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BMC
2022-08-01
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| Series: | Sustainable Environment Research |
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| Online Access: | https://doi.org/10.1186/s42834-022-00147-6 |
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| author | Rosalina Eka Praptiwi Jyun-Cyuan Syu Hai-Hsuan Cheng Tsung-Hsiung Yu Yu-Charng Wu Liang-Ming Whang |
| author_facet | Rosalina Eka Praptiwi Jyun-Cyuan Syu Hai-Hsuan Cheng Tsung-Hsiung Yu Yu-Charng Wu Liang-Ming Whang |
| author_sort | Rosalina Eka Praptiwi |
| collection | DOAJ |
| description | Abstract This study investigated the frequent blockages observed in the discharge pipeline in the chemical mechanical polishing wastewater treatment plant. Preliminary analyses indicated that blockages were predominantly consisted of residual organically-bounded Al due to overdosage of polyaluminum chloride (PACl) and anionic polymer during coagulation-flocculation process. To minimize the recurrence of blockage, jar test experiments were conducted in this study to identify optimum dosages of PACl and anionic polymer as well as optimum pH value. According to the model derived from jar tests, the optimum PACl dosage was dependent on the soluble Cu concentration of wastewater with low initial turbidity [< 1000 nephelometry turbidity units (NTU)]. The PACl dosage would require more than 5 mg L−1 when soluble copper below 20 mg L−1, while PACl is not necessary when more than 20 mg L−1 of soluble copper in the wastewater. On the other hand, optimal PACl dosage was dependent on the initial turbidity of wastewater with high initial turbidity (> 1000 NTU), while the optimal PACl dosage was 30 mg L−1 when initial turbidity around 7000 NTU. The change of pH in the range of 8 to 9.5 did not significantly affect the turbidity or Cu removal, however, higher pH increased the deposition of residual monomeric Al species which might lead to blockage. In summary, controlling PACl dosage at optimum dosage under the conditions of pH 8.5 ± 0.5 and 1 mg L−1 polymer could reduce the blockage occurrence as well as maintain the effluent quality to meet the standards. |
| first_indexed | 2024-04-13T13:06:06Z |
| format | Article |
| id | doaj.art-4087913e64b847788706e94ff5eb5c0a |
| institution | Directory Open Access Journal |
| issn | 2468-2039 |
| language | English |
| last_indexed | 2024-04-13T13:06:06Z |
| publishDate | 2022-08-01 |
| publisher | BMC |
| record_format | Article |
| series | Sustainable Environment Research |
| spelling | doaj.art-4087913e64b847788706e94ff5eb5c0a2022-12-22T02:45:47ZengBMCSustainable Environment Research2468-20392022-08-0132111210.1186/s42834-022-00147-6Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pHRosalina Eka Praptiwi0Jyun-Cyuan Syu1Hai-Hsuan Cheng2Tsung-Hsiung Yu3Yu-Charng Wu4Liang-Ming Whang5Department of Environmental Engineering, National Cheng Kung UniversityDepartment of Environmental Engineering, National Cheng Kung UniversityDepartment of Environmental Engineering, National Cheng Kung UniversityAdvanced Semiconductor Engineering GroupAdvanced Semiconductor Engineering GroupDepartment of Environmental Engineering, National Cheng Kung UniversityAbstract This study investigated the frequent blockages observed in the discharge pipeline in the chemical mechanical polishing wastewater treatment plant. Preliminary analyses indicated that blockages were predominantly consisted of residual organically-bounded Al due to overdosage of polyaluminum chloride (PACl) and anionic polymer during coagulation-flocculation process. To minimize the recurrence of blockage, jar test experiments were conducted in this study to identify optimum dosages of PACl and anionic polymer as well as optimum pH value. According to the model derived from jar tests, the optimum PACl dosage was dependent on the soluble Cu concentration of wastewater with low initial turbidity [< 1000 nephelometry turbidity units (NTU)]. The PACl dosage would require more than 5 mg L−1 when soluble copper below 20 mg L−1, while PACl is not necessary when more than 20 mg L−1 of soluble copper in the wastewater. On the other hand, optimal PACl dosage was dependent on the initial turbidity of wastewater with high initial turbidity (> 1000 NTU), while the optimal PACl dosage was 30 mg L−1 when initial turbidity around 7000 NTU. The change of pH in the range of 8 to 9.5 did not significantly affect the turbidity or Cu removal, however, higher pH increased the deposition of residual monomeric Al species which might lead to blockage. In summary, controlling PACl dosage at optimum dosage under the conditions of pH 8.5 ± 0.5 and 1 mg L−1 polymer could reduce the blockage occurrence as well as maintain the effluent quality to meet the standards.https://doi.org/10.1186/s42834-022-00147-6Pipeline blockage, Polyaluminum chloridepHAnionic polymer |
| spellingShingle | Rosalina Eka Praptiwi Jyun-Cyuan Syu Hai-Hsuan Cheng Tsung-Hsiung Yu Yu-Charng Wu Liang-Ming Whang Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH Sustainable Environment Research Pipeline blockage, Polyaluminum chloride pH Anionic polymer |
| title | Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH |
| title_full | Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH |
| title_fullStr | Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH |
| title_full_unstemmed | Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH |
| title_short | Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH |
| title_sort | linkage of pipeline blockage to coagulation flocculation process effect of anionic polymer and ph |
| topic | Pipeline blockage, Polyaluminum chloride pH Anionic polymer |
| url | https://doi.org/10.1186/s42834-022-00147-6 |
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