Linkage of pipeline blockage to coagulation-flocculation process: effect of anionic polymer and pH

Rosalina Eka Praptiwi, Jyun Cyuan Syu, Hai Hsuan Cheng, Tsung Hsiung Yu, Yu Charng Wu, Liang Ming Whang

研究成果: Article同行評審

摘要

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.

原文English
文章編號37
期刊Sustainable Environment Research
32
發行號1
DOIs
出版狀態Published - 2022 12月

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 可再生能源、永續發展與環境
  • 水科學與技術
  • 廢物管理和處置
  • 污染

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