Low-carbon Water Environment Technology Research Center, School of Environment & Natural Resources, Renmin University of China, Beijing, 100872, China.
Dongguan Water Group Co., Ltd, Dongguan, 523000, China.
Chemosphere. 2024 Sep;363:142836. doi: 10.1016/j.chemosphere.2024.142836. Epub 2024 Jul 14.
The main challenge in removing nutrients from municipal wastewater in China is the lack of available carbon sources. While hydrolysis acidification tanks can improve wastewater biodegradability by effectively utilizing internal carbon sources, high sludge concentrations are difficult to control in traditional tank variants. In this study, an innovative anaerobic filter (AnF) hydrolysis acidification reactor composed of a continuously stirred tank reactor (CSTR) and cloth media filter was designed to regulate and maintain high sludge concentrations in the hydrolysis acidifier. The reactor was used as a pretreatment unit for the anaerobic/anoxic/oxic (AAO) units and combined into an AnF-AAO system to explore the effectiveness of internal carbon source utilization in wastewater. The results indicate that as the sludge concentration in the hydrolysis acidifier increased, the hydrolysis and acidification processes became more efficient. The optimal sludge concentration was 40 g/L, which significantly increased the production of soluble chemical oxygen demand and volatile fatty acids. Above this concentration, the efficiency decreased. Compared to traditional AAO processes, the AnF-AAO system achieved superior total nitrogen and phosphorus removal with shorter hydraulic retention times and reduced sludge production by a significant amount of 35%. Due to its capacity for enhancing internal carbon source utilization, the AnF-AAO system constitutes a promising approach for sustainable urban wastewater treatment.
在中国，从市政废水中去除营养物的主要挑战是缺乏可用的碳源。水解酸化池可以通过有效利用内部碳源来提高废水的可生物降解性，但传统池型难以控制高污泥浓度。本研究设计了一种由连续搅拌槽式反应器（CSTR）和布质介质过滤器组成的新型厌氧过滤器（AnF）水解酸化反应器，以调节和维持水解酸化器中的高污泥浓度。该反应器作为厌氧/缺氧/好氧（AAO）单元的预处理单元，并与 AnF-AAO 系统相结合，以探索废水中内部碳源利用的有效性。结果表明，随着水解酸化器中污泥浓度的增加，水解和酸化过程变得更加高效。最佳污泥浓度为 40 g/L，显著提高了溶解性化学需氧量和挥发性脂肪酸的产量。超过此浓度，效率会降低。与传统的 AAO 工艺相比，AnF-AAO 系统具有较短水力停留时间和显著减少 35%的污泥产量，实现了优异的总氮和总磷去除效果。由于其增强内部碳源利用的能力，AnF-AAO 系统构成了可持续城市废水处理的有前途的方法。
