高溫好氧消化應用於下水污泥減量技術之研究

A study of sewage sludge reduction by using thermophilic aerobic digestion

鄭欽恆(Chin-Heng Cheng)

指導教授 ： 張添晉

國立臺北科技大學/工程學院/環境規劃與管理研究所/碩士(2007年)

摘要

台灣下水污泥量隨污水下水道用戶接管普及率上升而增加，其特性為有機質含量高。本研究利用歐、美、日等先進國家已開發之好氧嗜熱菌污泥減量技術，進行下水污泥高溫好氧消化減量特性之研究。
高溫好氧污泥減量技術其分解污泥主要可分為兩個步驟：(1) ㄧ部份之污泥迴流至高溫好氧反應槽，藉由嗜熱性細菌產生之水解酶，將結構複雜之大分子分解成容易被微生物利用之小分子，提高污泥之可生物降解性質；(2)當被分解成較小分子之污泥，再迴流至曝氣槽時，利用活性污泥中微生物分解及礦化，達成污泥分解之目的。
本研究採用S-TE process高去除效率之特點，進行高溫好氧消化應用於下水污泥減量特性之研究，本實驗分成兩部份進行，第一部份先將下水污泥給予預先加熱60~65℃及機械攪拌後，使細胞內有機質釋出，提高後續高溫好氧消化之效率，研究對污泥內微生物細胞壁之破碎效率；第二部份為進入高溫(65℃)好氧消化階段，將污泥以嗜熱性細菌好氧消化。經由本實驗結果得知第一部份污泥預熱最佳加熱溫度60℃~65℃，將污泥經過預熱60℃及機械攪拌破碎360分鐘後，污泥中溶解性COD值較未經過機械破碎之溶解性COD值為高，其顯示機械攪拌破碎具有破碎之效果；第二部份高溫好氧消化，批次消化5天之SS、VSS及CODss去除效率分別可達到53.7％、64.3％及63.3％，半連續消化9天之SS、VSS及CODt去除效率分別可達到30.2％、50.4％及24.8％，結果顯示本實驗於污泥破碎及高溫好氧消化均有良好之效果。

關鍵字

下水污泥 ； 嗜熱性細菌 ； 機械攪拌破碎 ； 高溫好氧消化

並列摘要

As the more popular sewerage treatment system, the more sludge produced in Taiwan. Depending on the characteristics of organic sludge, this study researches the properties of thermophilic aerobic digestion by innovative technologies developed.
In this process, the excess activated sludge is reduced in two stages : (1) A part of the returned sludge is solubilized with enzyme secreted from the thermophilic bacteria in the S-TE reactor. This enhances the bio-degradability of the return sludge. (2) The solubilized return sludge is then decomposed and mineralized by the activated sludge microorganisms in the aeration tank.
The focus is about the properties of thermophilic aerobic digestion applying in sewage by S-TE process. The experiments includes two parts: one is pre-heat at the level of 60~65℃, and find out the efficiency of disintegration cell well. The other is thermophilic aerobic digestion. The results show that the most advantageous temperature for microorganism is 60~65℃. In addition, dissolve COD twice as which not be 360 min agitating, indicate agitating help for the efficiency of disintegration. The results also show that removal efficiency in batch digestion of SS, VSS and CODss are 53.7％, 64.3％ and 63.3％. removal efficiency in semi-continuous digestion efficiency of SS, VSS and CODt are 30.2％, 50.4％ and 24.8％. Overall sludge broken and thermophilic aerobic digestion are positive help.

並列關鍵字

sewage sludge ； thermophilic bacteria ； mechanical disintegration ； thermophilic aerobic digestion

參考文獻

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