Civil Engineering Faculty, Environmental Engineering Department, Istanbul Technical University, Ayazaga Campus, Maslak, 34469, Istanbul, Turkey.
School of Chemical and Bioprocess Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
Environ Sci Pollut Res Int. 2019 Jan;26(2):1770-1780. doi: 10.1007/s11356-018-3665-8. Epub 2018 Nov 19.
Conventional activated sludge (CAS) process is one of the most commonly applied processes for municipal wastewater treatment. However, it requires a high energy input and does not promote energy recovery. Currently, high-rate activated sludge (HRAS) process is gaining importance as a good option to reduce the energy demand of wastewater treatment and to capture organic matter for valorizing through anaerobic digestion (AD). Besides, food waste addition to wastewater can help to increase the organic matter content of wastewater and thus, energy recovery in AD. The objective of this study is to evaluate the applicability of co-treatment of municipal wastewater and food waste in a pilot-scale HRAS system as well as to test the minimal hydraulic retention times (HRTs) such as 60 and 30 min. Food waste addition to the wastewater resulted in a 10% increase in chemical oxygen demand (COD) concentration of influent. In the following stages of the study, the pilot-scale system was operated with wastewater solely under the HRTs of 60 and 30 min. With the decrease of HRT, particulate COD removal increased; however, soluble COD removal decreased. The results demonstrated that if the settling process is optimized, more particulate matter can be diverted to sludge stream.
传统活性污泥（CAS）工艺是应用于城市污水处理最广泛的工艺之一。然而，它需要高能耗，并且不利于能量回收。目前，高负荷活性污泥（HRAS）工艺作为减少污水处理能耗和通过厌氧消化（AD）捕获有机物以实现增值的一种可行选择变得越来越重要。此外，将食物垃圾添加到废水中可以帮助提高废水的有机物含量，从而在 AD 中实现能量回收。本研究的目的是评估在中试规模 HRAS 系统中同时处理城市污水和食物垃圾的适用性，并测试最小水力停留时间（HRT）如 60 和 30 分钟。将食物垃圾添加到废水中会使进水的化学需氧量（COD）浓度增加 10%。在研究的后续阶段，中试系统仅在 HRT 为 60 和 30 分钟的条件下运行。随着 HRT 的降低，颗粒 COD 的去除率增加，而可溶性 COD 的去除率降低。结果表明，如果优化沉淀过程，可以将更多的颗粒物转移到污泥流中。
