工業區污水處理廠化學需氧量特性與污泥沉降性之探討

工業發展的世代環境生態遭受嚴重破壞，環境保護議題日益增長，對於整個工業區的永續發展，工業區污水處理廠扮演著相當重要的角色。本研究主要以芳苑工業區污水處理廠之進流廢水特性進行探討，其主要廢水來源為紡織業染整廢水佔全區總進流水量76％，其餘金屬製造業佔8％、塑膠製品製造業佔6％，故本研究將以染整業廢水高溶解性化學需氧量水質特性作為研究對象，並以每日採樣進行檢驗進流水水質、初級沉澱池出水、二沉池出水及放流水數據，進行研究水質特性來作為此次研究目的。探討各單元化學需氧量特性及污泥沉降性、溶解性化學需氧量、懸浮性化學需氧量於各單元處理系統中特性，並且依各單元處理系統之生物曝氣池食微比、MLSS、SVI、透視度之間關聯性進行分析，以利後續能作為污水處理廠中穩定操作模式及提昇整體成效之參考依據，並有效發揮污水處理廠之最佳操作模式。在整個研究中可以明確地發現SVI值介於150~250ml/g、SV30值介於240~520mg/g、F/M比值介於0.1~0.2kgCOD/ kg MLVSS.d、MLSS介於2200~3200mg/L及二沉池出流水質透視度大於20NTU以上時，三沉池無須再添加任何藥劑，其排放水質即可達到國家放流水標準。

關鍵字

工業區污水處理廠；溶解性化學需氧量；懸浮性化學需氧量

並列摘要

Environmental destruction following industrial development has raised concerns on environmental protection. The wastewater treatment plant plays a significant role in the sustainable development of an industrial park. The influent characteristics of Fangyuan Industrial Wastewater Treatment Plant were investigated in this study, in which the dye wastewater from textile industries account for 76% of the total wastewater, whereas metal manufacturing and plastics manufacturing account for 8% and 6% respectively. This study focused on the high soluble chemical oxygen demand (COD) characteristic of dye wastewater. Sampling and analysis were carried out to study the characteristics of influent qualities, effluent from the primary and secondary sedimentation tanks, as well as the discharge. The COD of each treatment unit, as well as the mutual characteristics of sludge settling, soluble COD and suspended COD between each unit were studied. Also, the correlation between food-to-microorganism ratio, MLSS, SVI and transparency of the biological aeration tank of each unit were analyzed. This is to provide useful information for a stable and optimum operation mode of a wastewater treatment plant in the future, as well as to improve the overall treatment efficiency. Throughout this study, the SVI varied between 150-250 ml/g, SV30 was 240-520 mg/g, F/M ratio was 0.1-0.2 kgCOD/kg MLVSS-day,MLSS was 2200-3200 mg/L and the turbidity of the secondary sedimentation tank effluent was higher than 20 NTU, the tertiary tank did not require further dosage to archive discharge standards.