A Study on The Carriers Compound Multi-Stage MBBR Biological Treatment Process for Domestic Sewage

Miaojie Li, Yonghong Liu (), Xiaode Zhou, Ning Wang and Bo Yuan
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Miaojie Li: College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Yonghong Liu: College of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710699, China
Xiaode Zhou: College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China
Ning Wang: College of Environmental and Chemical Engineering, Xi’an Polytechnic University, Xi’an 710699, China
Bo Yuan: College of Geology and Environment, Xi’an University of Science and Technology, Xi’an 710054, China

Sustainability, 2023, vol. 15, issue 10, 1-15

Abstract: Biocarriers are a key factor in moving bed biofilm reactors (MBBR) for domestic wastewater treatment and studies targeting biocarriers can be explored in more depth. In this study, two different types of biocarriers, namely anaerobic microbial carriers (AMC) and porous biogels (PBG), were used to treat real domestic wastewater and acted on a lab-scale tertiary MBBR system. The effects of the start-up process, water quality degradation, secondary start-up, and organic loading rate (OLR) on MBBR performance at room temperature (19–24 °C) and the same filling ratio (40%) were investigated, as well as the calculation of sludge yield. The results showed that the AMC–PBG/MBBR biological treatment process could complete the start-up process quickly in a short time and the OLR was finally determined to be 1.5 kgCOD/(m 3 ·d). In this case, the system was able to operate stably and complete the secondary start-up relatively quickly, with 80% and 95% removal of COD and NH 4 + -N, respectively. The biofilm was characterized by scanning electron microscopy (SEM) and high-throughput sequencing which revealed the changes of microorganisms in the biofilm during operation, among which the dominant phyla were Euryarchaeota and Proteobacteria . Finally, the apparent production of process sludge was monitored and calculated to be 0.043 kgMLSS/kgCOD which is a significant reduction in sludge compared to the conventional activated sludge method. These conclusions provide valuable information for the full-scale treatment of domestic wastewater.

Keywords: domestic sewage; organic loading rates; novel carrier; sludge yield rate (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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