Scholarlink

<p>This study evaluated the performance of a lab-scale hybrid UASB reactor, consisting of a UASB reactor coupled with a zeolite module, in removing organic matter and ammonium. The system operated in four stages, maintaining a constant flow rate of 145&#xa0;mL/h and a hydraulic retention time of 8.9&#xa0;h. Stage I involved reactor acclimation. Following this, the zeolite module containing natural clinoptilolite-type zeolite (Stages II and III) was coupled to the UASB reactor. Finally, after the natural zeolite was saturated, it was subsequently replaced with Na-modified zeolite (Stage IV). The natural zeolite achieved nearly 70% ammonium removal within the first three operating days, resulting in an effluent N-NH₄⁺ concentration of less than 10&#xa0;mg/L. However, the removal efficiency declined as the zeolite's sorption sites became saturated. In turn, Na-modified zeolite maintained a removal efficiency of 99.5%, with the saturation process occurring more slowly. In terms of organic matter, the UASB module removed 89.6 ± 7.7%. After the usage of natural zeolite, reactor efficiency increased to 92.4 ± 1.5%, while the Na-modified zeolite reached 90.3 ± 6.5%. The cation exchange capacity was 5.82&#xa0;mg N-NH₄⁺/g for natural zeolite and 9.75&#xa0;mg N-NH₄⁺/g for Na-modified zeolite. The sorption capacity for organic matter was 13.72&#xa0;mg COD/g for natural zeolite and 19.46&#xa0;mg COD/g for Na-modified zeolite. These results suggest that using Na-modified zeolite in an external module enhances the removal of ammonium and organic matter, thereby improving reactor performance.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Ammonium and organic matter removal in a hybrid UASB reactor packed with natural and sodium-modified zeolites

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年9月8日

查看全文
  • M. Gutiérrez-Arzaluz,
  • U. Rojas-Zamora,
  • M. L. Salazar-Peláez

摘要

This study evaluated the performance of a lab-scale hybrid UASB reactor, consisting of a UASB reactor coupled with a zeolite module, in removing organic matter and ammonium. The system operated in four stages, maintaining a constant flow rate of 145 mL/h and a hydraulic retention time of 8.9 h. Stage I involved reactor acclimation. Following this, the zeolite module containing natural clinoptilolite-type zeolite (Stages II and III) was coupled to the UASB reactor. Finally, after the natural zeolite was saturated, it was subsequently replaced with Na-modified zeolite (Stage IV). The natural zeolite achieved nearly 70% ammonium removal within the first three operating days, resulting in an effluent N-NH₄⁺ concentration of less than 10 mg/L. However, the removal efficiency declined as the zeolite's sorption sites became saturated. In turn, Na-modified zeolite maintained a removal efficiency of 99.5%, with the saturation process occurring more slowly. In terms of organic matter, the UASB module removed 89.6 ± 7.7%. After the usage of natural zeolite, reactor efficiency increased to 92.4 ± 1.5%, while the Na-modified zeolite reached 90.3 ± 6.5%. The cation exchange capacity was 5.82 mg N-NH₄⁺/g for natural zeolite and 9.75 mg N-NH₄⁺/g for Na-modified zeolite. The sorption capacity for organic matter was 13.72 mg COD/g for natural zeolite and 19.46 mg COD/g for Na-modified zeolite. These results suggest that using Na-modified zeolite in an external module enhances the removal of ammonium and organic matter, thereby improving reactor performance.