Cheng Yu, Cheng Qiangqiang, Zhao Chengjin, Ren Xianghao, Wang Yu, Kou Yingying, Chon Kangmin, Ko Myung-Han, Hwang Moon-Hyun
Key Laboratory of Urban Stormwater System and Water Environment, Ministry of Education, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
Department of Environmental Engineering, College of Engineering, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si 24341, Gangwon-do, Republic of Korea.
Membranes (Basel). 2023 May 12;13(5):510. doi: 10.3390/membranes13050510.
The reuse of wastewater has been identified as an important initiative for the sustainable development of the environment; thus, the removal of secondary effluent organic matter (EfOM) to ensure the safety of reused wastewater is the key step and a subject of extensive research. In this study, Al(SO) and anionic polyacrylamide were selected as coagulant and flocculant, respectively, for the treatment of secondary effluent from a food-processing industry wastewater treatment plant to meet the standard regulatory specifications for water reuse. In this process, the removal efficiencies of chemical oxygen demand (COD), components with UV, and specific ultraviolet absorbance (SUVA) were 44.61%, 25.13%, and 9.13%, respectively, with an associated reduction in chroma and turbidity. The fluorescence intensities (Fmax) of two humic-like components were reduced during coagulation, and microbial humic-like components of EfOM had a better removal efficiency because of a higher Log Km value of 4.12. Fourier transform infrared spectroscopy showed that Al(SO) could remove the protein fraction of the soluble microbial products (SMP) of EfOM by forming a loose SMP protein complex with enhanced hydrophobicity. Furthermore, flocculation reduced the aromaticity of secondary effluent. The cost of the proposed secondary effluent treatment was 0.034 CNY t %COD. These results demonstrate that the process is efficient and economically viable for EfOM removal to realize food-processing wastewater reuse.
废水回用已被视为实现环境可持续发展的一项重要举措；因此，去除二级出水有机物（EfOM）以确保回用废水的安全性是关键步骤，也是广泛研究的课题。在本研究中，分别选用硫酸铝（Al(SO)）和阴离子聚丙烯酰胺作为混凝剂和絮凝剂，用于处理某食品加工行业废水处理厂的二级出水，使其达到水回用的标准监管规范。在此过程中，化学需氧量（COD）、紫外光吸收成分和特定紫外吸光度（SUVA）的去除率分别为44.61%、25.13%和9.13%，同时色度和浊度也有所降低。两种类腐殖质成分的荧光强度（Fmax）在混凝过程中降低，且EfOM的微生物类腐殖质成分去除效率更高，因为其Log Km值较高，为4.12。傅里叶变换红外光谱表明，硫酸铝（Al(SO)）可通过形成疏水性增强的松散可溶性微生物产物（SMP）蛋白质复合物来去除EfOM中SMP的蛋白质部分。此外，絮凝降低了二级出水的芳香性。所提出的二级出水处理成本为0.034元/吨%COD。这些结果表明，该工艺对于去除EfOM以实现食品加工废水回用是高效且经济可行的。
