- 學位論文
生活污水污泥與不同食品廠廢水處理後之污泥厭氧共消化固體物減量探討
A Study on Waste Reduction of Sewage Sludge and Food Industry Wastewater Sludge by Anaerobic Co-digestion
摘要
本研究利用生活污水處理廠廢棄活性污泥與不同食品廠廢水處理後之污泥進行厭氧共消化，於單相式中溫35℃下反應，以三階段探討污泥減量及產能效益，第一階段進行有無預先熱解處理之厭氧消化實驗，探討本研究所選用之污泥的COD、TVS去除率、有無預先加熱水解的結果等。第二階段將廢棄活性污泥與不同食品污泥混合，控制三種有機濃度厭氧共消化之實驗。最後比較經熱解與超音波前處理後對污泥的厭氧消化影響。 廢棄活性污泥與不同食品廠廢棄污泥經過熱解前處理後之批次實驗中其COD與TVS的去除率皆會比未預先加熱之污泥高約5~15%，厭氧共消化實驗中以RA(廢棄活性污泥與冷凍食品污泥厭氧共消化)所得到結果為最佳，在TS濃度為20,000 mg/L時有最高的去除效果，其COD去除率分別為37.5% ，TVS去除率約為35.5%，初期氫氣與穩定後甲烷產能分別為4.3、43.2ml/g COD added。當TS濃度達到25,000 mg/L時對反應槽會有抑制效應。 廢棄活性污泥厭氧消化TS濃度為15,000mg/L時，COD、TVS去除率分別為18%、17%、經加熱前處理後COD、TVS去除率提昇為23%、24%，經超音波前處理後約可提昇至28%、26%，初期氫氣產率可從沒前處理時2.2 ml hydrogen/g COD added提昇為2.7 、2.9ml hydrogen/g COD added，穩定後甲烷產率從21.7提昇為30.1、33.2 ml methane/g COD added。可得知經過熱解與超音波前處理後之污泥可以有效提昇其去除效果與氣體產率，預先熱解與超音波破碎可以促進廢棄活性污泥水解並加以利用，最好為經超音波前處理其生物氣體、氫、甲烷總產量分別提昇62%、37%、50%。
並列摘要
This study is aimed to investigate the digestion rate and biogas production rate of waste activated sludge(WAS) and wasted sludge form different food industry by anaerobic co-digestion of a single phase under a temperature condition of 35℃. There are three parts, anaerobic digestion experiment WAS and food sludge in the first parts, were selected WAS and food sludges best removal rate results. The anaerobic co-digestion of WAS and wasted sludge form food industry in different organic loading was studied in the second parts. Lastly, the removal efficient after by heated and ultrasonic pretreatment of anerobic digestion WAS digestion were studies. The removal rate of total volatility solids (TVS) and chemical oxygen demand (COD) are higher 5~15% when sludge was heated pretreatment. The WAS was mixed with the different concentration of food sludge by anaerobic co-digestion, removal rate efficiency and biogas yield were better than no mixed, When the total solids(TS) concentration is 20,000 mg/L of the RA(WAS and frozen food sludge),the TVS and COD removal rate were about 36.5% and 37.5% in anaerobic are the best , hydrogen and methane yield about 4.3,43.2 ml/g COD added which were the best results than the other loading, the anaerobic digestion reaction was declined, when the TS concentration is over 25,000 mg/L. The experiment removal of anaerobic WAS digestion without pretreatment, the COD and TVS removal rate were about 18% and 17% , hydrogen and methane yield were about 2.2 and 21.7 ml /g COD added,WAS of pre-heated treatment,the COD and TVS removal rate promotion is 23% and 24% the hydrogen and methane yield were about 2.7 and 30.1 ml /g COD added, pretreatment received by the ultrasonic of the COD and TVS removal rate increase 28%,26%, the hydrogen and methane yield were about 2.9 and 3.2 ml /g COD added, the WAS pretreatment received by the heated and ultrasonic could increased sludge removal rate and hydrogen,methane yield.After anaerobic WAS digestion with ultrasonic pretreatment the total biogas,hydrogen and methane were increased 62%,37%,50%.