Ammonium-nitrogen-contaminated groundwater remediation by a sequential three-zone permeable reactive barrier (multibarrier) with oxygen-releasing compound (ORC)/clinoptilolite/spongy iron: column studies

作者：Huang, Guoxin; Liu, Fei^*; Yang, Yingzhao; Kong, Xiangke; Li, Shengpin; Zhang, Ying; Cao, Dejun

来源：Environmental Science and Pollution Research, 2015, 22(5): 3705-3714.

DOI：10.1007/s11356-014-3602-4

• Ammonium-nitrogen
• Groundwater remediation
• Sequential permeable reactive barrier (multibarrier)
• Oxygen-releasing compound (ORC)
• Clinoptilolite
• Spongy iron

A novel sequential permeable reactive barrier (multibarrier), composed of oxygen-releasing compound (ORC)/clinoptilolite/spongy iron zones in series, was proposed for ammonium-nitrogen-contaminated groundwater remediation. Column experiments were performed to: (1) evaluate the overall NH4 (+)-N removal performance of the proposed multibarrier, (2) investigate nitrogen transformation in the three zones, (3) determine the reaction front progress, and (4) explore cleanup mechanisms for inorganic nitrogens. The results showed that NH4 (+)-N percent removal by the multibarrier increased up to 90.43 % after 21 pore volumes (PVs) at the influent dissolved oxygen of 0.68 similar to 2.45 mg/L and pH of 6.76 similar to 7.42. NH4 (+)-N of 4.06 similar to 10.49 mg/L was depleted and NO (x) (-)-N (i.e., NO3 (-)-N + NO2 (-)-N) of 4.26 similar to 9.63 mg/L was formed before 98 PVs in the ORC zone. NH4 (+)-N of a parts per thousand currency sign4.76 mg/L was eliminated in the clinoptilolite zone. NO (x) (-)-N of 10.4 similar to 12.80 mg/L was lost before 21 PVs in the spongy iron zone. The clinoptilolite zone length should be reduced to 30 cm. Microbial nitrification played a dominant role in NH4 (+)-N removal in the ORC zone. Ion exchange was majorly responsible for NH4 (+)-N elimination in the clinoptilolite zone. Chemical reduction and hydrogenotrophic denitrification both contributed to NO (x) (-)-N transformation, but the chemical reduction capacity decreased after 21 PVs in the spongy iron.

• 出版日期2015-3
• 单位中国地质科学院水文地质环境地质研究所; 中国地质大学（北京）; 中国肉类食品综合研究中心