PRELIMINARY STUDY ON APPLICATION OF SLUDGE DENSIFICATION SYSTEM TECHNOLOGY IN AN INVERTED AAO CONTINUOUS FLOW WASTEWATER TREATMENT PLANT
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摘要: 選取無錫市某污水處理廠(設計規模15萬m3/d)進行污泥致密系統處理技術(SDST)工藝優化,在外回流工藝段增設污泥致密模塊以實現污泥沉降性能的有效提高。該廠采用倒置AAO工藝(缺氧/厭氧/好氧),一期和二期工程分別作為實驗組和對照組,設計規模分別為4萬,11萬m3/d。致密模塊以半覆蓋式處理(最大處理量為原設計剩余污泥量的50%),成功運行90 d,一期工程TN去除能力顯著提升,出水濃度下降14.7%,由6.32 mg/L下降至5.39 mg/L。啟動階段(1~36 d),一期好氧池污泥沉降速度提升至1.92 m/h,穩定提升階段(42~90 d),其沉降速度和SVI30分別為(3.62±0.52) m/h和(49.3±5.5) mL/g,而二期分別為(1.93±0.35) m/h和(59.3±5.5) mL/g。污泥致密模塊具有穩定的污泥致密作用,致密污泥MLSS為(19.3±2.75) g/L,SVI30僅為(36.7±9.0) mL/g。通過鏡檢成功觀察到致密污泥中含有大量的小型顆粒狀絮體,但顆?;潭扔邢?。研究發現,活性污泥中大量的纖維狀和惰性無機物質是影響致密模塊穩定運行的重要因素,通過增設螺旋式格柵可以保障致密模塊的穩定運行,而無機物質中的砂、鐵鹽和鋁鹽等對系統的影響仍需進一步探討。此外,耦合除砂措施并采用全覆蓋式處理以優化改造致密模塊是進一步提高致密污泥顆?;潭鹊年P鍵。該工程案例系SDST在國內倒置AAO連續流污水處理廠的首次成功應用,將為國內存量污水處理廠的升級改造提供重要思路。
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關鍵詞:
- 污泥致密系統處理技術 /
- 倒置AAO /
- 連續流污水處理工藝 /
- 工藝優化 /
- 沉降性能
Abstract: The sludge densification system technology (SDST) was applied in a wastewater treatment plant (WWTP) for engineering modification, located in Wuxi, with a designed treatment capacity of 150000 m3/d, and a sludge densification module was added in the external reflux process section to effectively improve sludge settling performance. The inverted AAO (anoxic/anaerobic/oxic) process was adopted in the WWTP with the Phase Ⅰ project (40000 m3/d) and Phase Ⅱ project (110000 m3/d), acting as the experimental group and control group, respectively. After the engineering modification, the densification module was successfully operated for 90 days in a half-scale mode, which maximum treatment capacity was 50% of the original design surplus sludge volume. The removal capacity of TN in the Phase Ⅰ project was significantly improved, and the effluent concentration decreased by 14.7% (from 6.32 mg/L to 5.39 mg/L). During the start-up stage (day 1 to 36), the settling rate of aerobic sludge increased to 1.92 m/h. In the stable and lifting stage (day 42 to 90), the settling rate and SVI30 were (3.62±0.52) m/h and (49.3±5.5) mL/g, respectively, while the counterparts of sludge in the Phase Ⅱ project were (1.93±0.35) m/h and (59.3±5.5) mL/g. The densification device had a stable sludge densification effect so that the densified sludge MLSS was (19.3±2.75) g/L, and the SVI30 was only (36.7±9.0) mL/g. Many small granular flocs in densified sludge were successfully observed through microscopic examination, but the degree of granulation was limited. This study found that the massive fibrous and inert inorganic matters in activated sludge were important factors affecting the operation of the densification module, while a spiral grating was added to ensure its operation. Moreover, the effects of these inorganic substances such as sand, iron salt, and aluminum salt on the system still need to be further discussed. In addition, coupling sand removal measures and adopting full coverage treatment to optimize and transform the densification module were the key to further improving the granulation degree of densification sludge. Our team has successfully applied the SDST in an inverted AAO continuous flow WWTP in China for the first time, providing an important method for the upgrading and modification of existing wastewater treatment plants. -
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