- 期刊
加壓浮除法於養牛廢水處理之應用
Effect on dissolved air flotation in dairy wastewater treatment
摘要
本研究目的為探討加壓浮除法對養牛廢水處理效率之影響。試驗分別利用養牛場之三段式廢水處理系統中各階段處理（機械式固液分離、厭氣與好氣處理後）後之廢水進行浮除評估，厭氣處理後與好氣處理後之處理水再分別添加不同濃度之多元氯化鋁、陽離子型高分子凝集劑及氯化鐵溶液等化學混（助）凝劑，進行浮除處理後測定pH、COD及SS。試驗結果顯示，單獨使用加壓浮除法對固液分離後之養牛廢水中COD與SS去除效率最佳，去除率分別為27.7%與47.9%。應用化學混凝法搭配加壓浮除系統處理厭氣處理後與好氣處理後之養牛處理水時，分別添加600與200mg/L之多元氯化鋁、100與26.6mg/L之陽離子型高分子凝集劑、及100與30mg/L之氯化鐵處理後，COD與SS皆可處理至符合放流水標準。綜上所述，加壓浮除法可有效去除養牛廢水中之COD與SS，如搭配化學混凝法使用更可將其處理至符合放流水標準。
並列摘要
The purpose of this study was to investigate the effect of dissolved air flotation (DAF) process on dairy cattle wastewater treatment with a laboratory experiment. Five hundred milliliters of wastewater after solid-liquid separator (ASL), after anaerobic digestion (AND) and after aerobic digestion (AAT) were pumped into the floatation tanks, respectively. Three different coagulant (polyaluminium chloride, PAC, cationic polymer, CPM and ferric chloride solution, FeCl3)were added into the AND and AAT, respectively. Then, 500 mL of pressurization water (5 kg/cm^2) was injected into the bottom of the flotation tanks and the subnatant was sampled after 1 min to analysis suspended solid (SS) and chemical oxygen demand (COD). The results revealed that the removal efficiency on ASL was the best that removal efficiencies of COD and SS were 27.7% and 47.9 %, respectively. DAF treatment of AND and AAT with PAC (600 and 200 mg/L), CPM (100 and 26.4 mg/ L) and FeCl3 (100 and 30 mg/L) can meet the effluent standards. In conclusion, The DAF process can be set after the solid liquid separation to reduce the organic loading of the following process in the full scale the dairy wastewater treatment system, while that can be set after AAT with coagulants to reduce the production of chemical sludge.