【學術亮點】Enhanced recovery of lead and nitrate via fluidized-bed reactor: Recovery of insoluble salts from simulated gold cyanidation effluent
Facility Agricultural: Utilization of Livestock Waste in Automated Cultivation of Microalgae and Reutilization in Poultry Farming【Department of Environmental Engineering / Lu, Ming-Chun / Distinguished Professor】
設施農業：畜牧廢棄物於小球藻自動栽培與禽類再利用【環境工程學系/盧明俊特聘教授】
| 論文篇名 | 英文：Enhanced recovery of lead and nitrate via fluidized-bed reactor: Recovery of insoluble salts from simulated gold cyanidation effluent 中文：提升流體化床反應槽鉛與硝酸鹽回收效能：從合成黃金氰化法製程廢水中回收不溶性鹽類 |
| 期刊名稱 | Chemical Engineering Journal |
| 發表年份,卷數,起迄頁數 | 2025, 524, 169101 |
| 作者 | Madlangbayan, Glyzel Ann C.; Quiton, Khyle Glainmer N.; Ha, Thi-Hanh; Lu, Ming-Chun(盧明俊)* |
| DOI | 10.1016/j.cej.2025.169101 |
| 中文摘要 | 人為活動已大幅擾亂重金屬的自然循環，常導致其在環境中的濃度超過法規限制。在眾多污染物中，鉛與硝酸鹽尤為常見，對環境與人類健康構成重大威脅，因此自廢水中去除這些物質成為當務之急。本研究採用流動床均質結晶（Fluidized-Bed Homogeneous Crystallization, FBR）技術，處理模擬含鉛與硝酸鹽的金氰化製程廢水。研究系統性探討操作參數對去除效率與結晶行為的影響，包括出流水酸鹼值（pHe）、[NaOH]/[Pb(NO₃)₂] 摩爾比、硝酸鉛濃度（Pb(NO₃)₂）以及進流速率（QOH）。FBR系統透過生成不溶性的鉛硝酸鹽多晶型物（主要為氫氧化鉛硝酸鹽與氧化氫氧化鉛硝酸鹽），有效去除兩種污染物。在所有參數中，以pHe與摩爾比最為關鍵，最佳條件為pHe ≈ 8.0，摩爾比為1.0。在此條件下，當[Pb(NO₃)₂] = 0.07 M時，系統可達到99.99%的總去除率（Total Removal, TR），鉛的結晶回收率（Crystalline Recovery, CR）則達99.98%。與批次反應器相比，FBR展現出更佳的製程穩定性、更高品質的顆粒，以及更少的污泥處理需求。研究結果顯示，FBR具備作為先進且可擴展技術的潛力，可用於資源回收並符合嚴格的廢水排放標準。 |
| 英文摘要 | Anthropogenic activities have considerably disrupted the natural cycles of heavy metals, often resulting in environmental concentrations that exceed regulatory limits. Among these pollutants, lead and nitrate are particularly prevalent and pose significant threats to environmental and human health, making their removal from wastewater a critical priority. This study employed a fluidized-bed homogeneous crystallization (FBR) process to treat simulated gold cyanidation wastewater containing lead and nitrate. The research systematically examined the influence of operational parameters, including effluent pH (pHe), [NaOH]/[Pb(NO₃)₂] molar ratio, lead nitrate (Pb(NO₃)₂) concentration, and inflow rate (QOH), on the removal efficiency and crystallization behavior. The FBR system achieved effective removal of both contaminants through the formation of insoluble lead nitrate polymorphs, primarily lead hydroxide nitrate and lead oxide hydroxide nitrate. Among the parameters studied, pHe and molar ratio were most critical, with optimal conditions identified at pHe ≈ 8.0 and a molar ratio of 1.0. At these conditions, with [Pb(NO₃)₂] = 0.07 M, the system attained a Total Removal (TR) of 99.99 %, while the Crystalline Recovery (CR) of lead reached 99.98 %. Compared with batch reactors, the FBR demonstrated superior process stability, higher-quality granules, and reduced sludge handling requirements. These results highlight the potential of the FBR as an advanced and scalable technology for resource recovery and compliance with stringent wastewater discharge standards. |
| 發表成果與本中心研究主題相關性 | 本研究透過FBR技術高效去除廢水中鉛與硝酸鹽，促進污染物資源化與再利用，符合循環經濟「減量、再生、再利用」原則。同時降低重金屬與氮污染風險，有助於保護土壤與水源品質，支援永續農業發展目標。 |
