不同污泥消化方式對污泥臭味去除與脫水之影響

本研究旨在探討豬糞尿廢水污泥不同處理方式對污泥臭味氣體消長與脫水之關係。試驗材料採用豬糞尿廢水場之初沉污泥、厭氣污泥與混合污泥，利用500L之消化槽3個。測定厭氣消化與好氣消化時間對臭味氣體與污泥脫水性之變化。試驗結果顯示，豬糞尿廢水處理之初沉污泥經厭氣消化處理之臭味氣體第10天時以RSH與H_2S之產量最高，在第20天時降至1ppm以下，NH_3與（CH_3）_3N氣體則產量少；初沉污泥好氣消化處理之RSH與H_2S在第1天最高，第3天後降至5ppm；NH_3與（CH_3）_3N則在第6天最高，第8天後開始降低；厭氣污泥不論以厭氣或好氣消化處理之臭味氣體產量非常低；以混合污泥經厭氣消化後進行好氣消化之臭味氣體在第5天就降至3ppm以下或測不到，污泥脫水性之毛細汲取時間（CST）值35秒，顯示脫水性佳。於廢水處理場收集之污泥，經污泥厭氣消化處理後再經好氣消化處理，其最適之污泥脫水時間為第3天，其CST值34秒，凝聚劑（polymer）之加藥量也最少。由上結果顯示豬糞尿廢水處理場之混合污泥只要經厭氣消化後其好氣消化只要5天的時間就可使污泥之臭味氣體消失，污泥性質穩定且污泥脫水性佳，polymer之添加量也最低。

關鍵字

豬糞尿污泥；污泥厭氣消化；污泥脫水

並列摘要

The objectives of this study were to investigate the influence of anaerobic/aerobic digestion of swine sludge on odor mitigation and sludge dewatering. Various kinds of sludge removed from primary clarifiers and anaerobic and aerobic reactors treating piggery wastewater were used. Three digesters (500 L) filled with either a particular or mixed sludge were used. Both odorous components and the capillary suction time (CST) were monitored to evaluate the effects of the aerobic and anaerobic digestion time on odor mitigation and sludge dewatering efficiency. The results showed that the concentrations of RSH and H_2S generated from anaerobic digestion of primary sludge were the highest at the 10th day, and they were declined to 1 ppm at the 20th day. Meanwhile, very low concentrations of (CH_3)_3N and NH_3 were detected. The concentrations of RSH and H_2S generated from aerobic digestion of primary sludge were the highest at the first day, and were declined to 5 ppm at the third day. Meanwhile, the concentrations of (CH_3)_3N and NH_3 were the highest at the sixth day, and they were declined remarkably at the eighth day. The concentrations of odorous components generated from either anaerobic or aerobic digestion of mixed sludge (primary sludge plus anaerobic sludge) were very low; for example, the concentrations of odorous components generated from aerobic digestion of mixed sludge dropped to ＜ 3 ppm at the fifthtime. The optimum time for sludge dewatering (i.e., the CST was the shortest, 34 seconds; and the required polymer dosage was the least) fell at the third day of aerobic digestion following anaerobic digestion of swine sludge. The polymer dosage required for the conditioning purpose will be the least and the offensive odor can be diminished if five days of aerobic digestion following anaerobic digestion of mixed sludge are operated.

並列關鍵字

Swine sludge ； Anaerobic digestion ； Aerobic digestion ； Sludge dewatering

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