YUCheng,ZHANGKai-yuan,WANGKai-jun,et al.Continuous Flow Aerobic Granular Sludge Process Upgrading a Full-scale Urban Wastewater Treatment Plant[J].China Water & Wastewater,2023,39(13):1-8.
连续流好氧颗粒污泥技术升级现有污水处理工程
- Title:
- Continuous Flow Aerobic Granular Sludge Process Upgrading a Full-scale Urban Wastewater Treatment Plant
- 摘要:
-
好氧颗粒污泥（AGS）工艺被认为是活性污泥工艺的潜在替代工艺之一，在序批式反应器中已经实现了工业化应用，但连续流模式下的AGS仍是一个重大挑战。鉴于此，采用一种新型的微氧-好氧耦合沉淀一体式反应器，结合工程实例分析了该系统的除污效果和颗粒化情况。经过约1个月的启动期后，观察到了明显的颗粒化现象；在稳定运行阶段，污泥平均粒径为138.5 μm，粒径>200 μm的污泥占比达28.9%。平均出水COD、NH4+-N和TN分别为25.5、0.5和10.1 mg/L，达标率为100%。此外，还讨论了该系统与传统活性污泥工艺及现有AGS工艺（Nereda
和S：：Select）在启动时间、颗粒化、出水水质、占地及能耗等方面的差异。结果表明，相比于传统活性污泥工艺，其能提高出水水质、减小占地面积、降低运行能耗；相比于现有AGS工艺，其能直接应用于连续流污水处理厂的升级改造。
- Abstract:
-
Aerobic granular sludge (AGS) technology is considered as a good alternative of conventional activated sludge process, and has been scaled-up in sequencing batch reactors. However, the continuous flow AGS is still a challenge. Here, a novel configuration of micro-aerobic/aerobic reactor with an internal three-phase separator was applied in a low-strength urban wastewater treatment plant (WWTP). Pollutants removal performance and granulation potential were analyzed. After a start-up period of approximately one month, granulation appeared and AGS was maintained thereafter. The average diameter was 138.5 μm and AGS of greater than 200 μm accounted for 28.9% of granules. The average effluent COD, NH4+-N and TN concentrations were 25.5 mg/L, 0.5 mg/L and 10.1 mg/L，respectively, and effluent requirements were easily met. Furthermore, start-up time, granulation, pollutants removal performance, footprint, and energy consumption were compared between the developed configuration, conventional activated sludge system and the existing AGS technologies of Nereda and S::Select. Compared to conventional activated sludge system, the developed system showed great potential for better effluent quality and minimized footprint. Meanwhile, compared to existing AGS technologies, the developed system could directly upgrade the existing continuous flow WWTP.
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