| 摘要: | 隨著科技產業的迅速發展，國內工業園區的廢水排放量急劇增加，且經過 污水處理廠之生物處理系統後廢水中仍含有許多難以生物分解的化合物，表示 傳統生物處理方法已無法高效處理。為??，行政院環保部於民國 110 年 1 月 1 日發布新的工業區廢水排放標準，要求企業必須檢查並評估現有廢水處理設 施，確保其符合新法規。為有效達到標準，需要全面了解廢水中 COD 的特 性。
本研究旨在探討經生物處理後之工業區廢水 COD 細分類及化學氧化效 能，並利用反應曲面法探討最適加藥條件。研究首先針對經生物處理後的工業 區廢水進行 COD 細分類分析，將 COD 分為快速可生物分解 COD(Readily Biodegradable COD, RBCOD)、緩慢可生物降解 COD (Slowly/Particulate Biodegradable COD, SBCOD)、溶解性不可生物分解 COD (Non-Biodegradable Soluble COD, NBSCOD)和顆粒性不可生物降解 COD (Non-Biodegradable Particulate COD, NBPCOD)。分析結果顯示，經生物處理後的工業區廢水中主要 為 NBSCOD，約佔總 COD 的 69.6 %至 77.5 %。
接下來，研究以次氯酸鈉和氯酸鈉為氧化劑，分別在不同 pH 值和濃度下 進行氧化處理，並觀察 COD 去除率、TOC 去除率、NH4+-N 去除率等指標。結 果顯示，次氯酸鈉在鹼性環境下具有較高的氧化效能，在 pH 值為 8，濃度為 300 mg/L 時，可以達到 62.4 %的 COD 去除率。氯酸鈉則在酸性環境下具有較 好的氧化效能，但對於 TOC 去除效果有限，且會干擾 COD 的測定。
??外，研究利用反應曲面法建立了氧化劑濃度、pH 值和混凝劑濃度三因子 交互作用的模型，並探討其對 COD 去除率的影響。模型顯示，氧化劑濃度、 pH 值和混凝劑濃度均對 COD 去除率具有顯著影響。最佳化加藥條件評估結果 以達到 COD 符合放流水標準(80 mg/L)為目標。;With the rapid development of the technology industry, the wastewater discharge from domestic industrial parks has sharply increased. Moreover, the biological treatment systems in wastewater treatment plants still contain many compounds that are difficult to biodegrade, indicating that traditional biological treatment methods are no longer effective. In response, the Environmental Protection Administration (EPA) announced new wastewater discharge standards for industrial parks on January 1, 2021, requiring enterprises to inspect and evaluate their existing wastewater treatment facilities to ensure compliance with the new regulations. To effectively meet these standards, a comprehensive understanding of the characteristics of COD in wastewater is necessary.
This study aims to investigate the classification of COD in industrial park wastewater after biological treatment and the effectiveness of chemical oxidation, while using response surface methodology to explore the optimal dosing conditions. The research first conducts a detailed classification analysis of COD in industrial park wastewater after biological treatment, dividing COD into four categories:Readily Biodegradable COD (RBCOD), Slowly/Particulate Biodegradable COD (SBCOD), Non-Biodegradable Soluble COD (NBSCOD), and Non-Biodegradable Particulate COD (NBPCOD). The analysis results show that the primary component in the industrial park wastewater after biological treatment is NBSCOD, which accounts for approximately 69.6% to 77.5% of the total COD.
Next, the study uses sodium hypochlorite and sodium chlorate as oxidants,
conducting oxidation treatment at different pH levels and concentrations, while
observing indicators such as COD removal rate, TOC removal rate, and NH4+-N ii
removal rate. The results indicate that sodium hypochlorite has higher oxidation efficiency in alkaline conditions, achieving a 62.4 % COD removal rate at a pH of 8 and a concentration of 300 mg/L. Sodium chlorate shows better oxidation efficiency in acidic conditions, but has limited effect on TOC removal and may interfere with COD measurement.
Moreover, the study employs response surface methodology to establish a model for the interaction of oxidant concentration, pH value, and coagulant concentration, exploring their effects on COD removal rates. The model indicates that oxidant concentration, pH value, and coagulant concentration all have significant impacts on COD removal rates. The results of the optimization assessment aim to achieve a COD that meets the discharge standard (80 mg/L). |
