Nguyen Phuoc Bao Niem, Pham Van Toan, Viet Le Hoang, Kumar Pankaj, Meraj Gowhar
College of Environment and Natural Resources, Can Tho University, Can Tho 900000, Vietnam.
Institute for Global Environmental Strategies, Hayama 240-0115, Japan.
Scientifica (Cairo). 2024 Oct 21;2024:8133617. doi: 10.1155/2024/8133617. eCollection 2024.
Vermicelli production generates wastewater that is rich in organic and nutrient pollutants, which poses significant environmental challenges. Conventional biological treatments, either alone or in combination with other methods, often fail to achieve high efficiency and operational stability. This study explored the potential of the Fenton process, followed by aerobic activated sludge treatment, to enhance the biodegradability and mineralization of organic substances in vermicelli wastewater. Orientation experiments were performed to examine the effects of operating variables such as pH, reaction time, settling time, and ratio HO/Fe on COD removal in order to select the optimal conditions for operating the model in a batch of 20 L, that is, pH = 3, reaction time of 90 min, settling time of 90 min, and ratio of HO/Fe used 3 : 1 (4.5 : 1.5 g/L). The removal efficiencies of COD, BOD, TN, TP, and SS reached 75.83%, 67.26%, 28.24%, 26.63%, and 91.9%, respectively. The BOD/COD increased from 0.52 to 0.63, facilitating aerobic activated sludge, which had batch conditions of 15 L with pH of 6.5-8.5, DO ≥3 mg/L, additional nutrients with a dose of 12 mg/L, retention time of 14 h, and settling time of 2 h. As a result, the removal rate of those parameters climbed quite notably, except in SS (95.6%, 96.0%, 84.6%, 84.1%, and 83.6%), and their concentration parameters remained within the allowance levels of the National Technical Regulation in Vietnam before being discharged into the environment. However, the efficiency of treatment in the aerobic activated sludge stage for removing COD and BOD was not as high as anticipated (83% and 87.33%, respectively) owing to the influence of the high TDS concentration. Thus, additional research is required to address this challenge. The integrated treatment system combining the Fenton process with aerobic activated sludge demonstrated significant potential for the effective reduction of organic and nutrient pollutants in vermicelli wastewater, thereby achieving compliance with regulatory standards. However, the observed limitations in COD and BOD removal efficiency, likely due to elevated TDS levels, indicate the need for further investigation and optimization to enhance the overall treatment performance.
粉丝生产产生的废水中富含有机和营养污染物，这带来了重大的环境挑战。传统的生物处理方法，无论是单独使用还是与其他方法结合使用，往往都无法实现高效和运行稳定性。本研究探索了芬顿法（Fenton process）继以好氧活性污泥处理，以提高粉丝废水中有机物质的生物降解性和矿化作用的潜力。进行了定向实验，以研究诸如pH值、反应时间、沉降时间和HO/Fe比例等操作变量对化学需氧量（COD）去除的影响，以便在20升的批次中选择模型运行的最佳条件，即pH值 = 3、反应时间90分钟、沉降时间90分钟以及使用的HO/Fe比例为3∶1（4.5∶1.5克/升）。COD、生化需氧量（BOD）、总氮（TN）、总磷（TP）和悬浮物（SS）的去除效率分别达到75.83%、67.26%、28.24%、26.63%和91.9%。BOD/COD从0.52增加到0.63，有利于好氧活性污泥处理，其批次条件为15升，pH值为6.5 - 8.5，溶解氧（DO）≥3毫克/升，额外添加剂量为12毫克/升的营养物质，停留时间为14小时，沉降时间为2小时。结果，除了SS（95.6%、96.0%、84.6%、84.1%和83.6%）外，这些参数的去除率显著提高，并且它们的浓度参数在排放到环境之前保持在越南国家技术法规的允许水平之内。然而，由于高总溶解固体（TDS）浓度的影响，好氧活性污泥阶段去除COD和BOD的处理效率不如预期（分别为83%和87.33%）。因此，需要进一步的研究来应对这一挑战。将芬顿法与好氧活性污泥相结合的综合处理系统显示出有效减少粉丝废水中有机和营养污染物的巨大潜力，从而达到监管标准。然而，观察到的COD和BOD去除效率的局限性，可能是由于TDS水平升高所致，这表明需要进一步调查和优化以提高整体处理性能。
