Simultaneous nitrification and denitrification in moving bed bioreactor and other biological systems

A Comparison of Biosolids Production and System Efficiency between Activated Sludge, Moving Bed Biofilm Reactor, and Sequencing Batch Moving Bed Biofilm Reactor in the Dairy Wastewater Treatment

“…Moreover, SBMBBR aeration allows for nitrification, and the subsequent anoxic Denitrification in an activated sludge process plays a major role in TN removal. The denitrification process is primarily carried out by heterotrophic bacteria, although autotrophic denitrifiers are also identified [20]. In an anoxic environment, the nitrate ion can be reduced by organic matter to nitrogen gas.…”

“…Therefore, another possible explanation for the SBMBBR's high efficiency for TN removal at different organic loads might depend on the increased amount of biomass based upon attached growth in the carriers. The biofilm accumulation highly depends on the carrier's surface roughness and more importantly on the specific surface area which is usually attributed to high organic removal [20].…”

“…For instance, attached growth processes increase the biofilm surface area, increasing the volume of substrate able to be adsorbed from wastewater, improving the overall efficiency of the process [18]. Biofilm in the carriers might promote aerobic, anoxic, and anaerobic mechanisms, with the substrate limitation being responsible for the thickness of the biofilm [18][19][20]. This type of reactor opens a variety of positive perspectives for its recognized ability to oxidize carbon and nitrogen, for requiring a smaller reactor than an activated sludge system, for not requiring any sludge recycle, for the reduced costs combined with a smaller carbon footprint, lower requirement for settling volume and sludge formation, and for its biomass retention capacity in floating mobile plastic carriers [18,[21][22][23][24][25].…”

Exploring the carbon and nitrogen removal capacity of a membrane aerated biofilm reactor for low-strength municipal wastewater treatment

“…Therefore, the carbon source in the bulk liquid is consumed firstly by denitrifying bacteria in the outer layer for full denitrification, while the ammonia nitrogen in the bulk liquid is consumed by nitrifying bacteria in the inner layer where dissolved oxygen is enough for full nitrification. The unique counter-diffusion and resultant stratified biofilm endow the MABR with obvious advantages over conventional co-diffusion processes like the moving bed biofilm reactor 5 and aerobic granular sludge process 6 in terms of high oxygen transfer efficiency and resultant low energy consumption from bubble-free aeration, preferential carbon source consumption for denitrification from the well stratified biofilm, and small footprint from the high specific surface area for biofilm attachment. 2 The biofilm stratification is mainly controlled by the loading rate of COD, ammonia nitrogen and oxygen.…”

Low temperature Moving Bed Bioreactor denitrification as mitigation measure to reduce agricultural nitrate losses

“…According to Bhattacharya and Mazumder (2021), the Moving Bed Bioreactor (MBBR) technology has established itself as a robust and compact reactor system for nitrogen removal from wastewater. In this system, plastic carriers are used to provide a support for biofilm growth.…”