MBBR (Moving Bed Biofilm Reactor) technology is a wastewater treatment process combining activated sludge and biofilm methods. It involves adding a certain quantity of suspended carriers into the reactor. These carriers are typically made of modified materials like polyethylene or polypropylene, possessing characteristics such as a specific gravity close to that of water, ease of biofilm formation, resistance to clumping and clogging, and simplicity of biofilm detachment. Driven by aeration or mechanical mixing, the carriers remain suspended within the reactor, providing microorganisms with a suitable gas-liquid-solid three-phase growth environment. Microorganisms attach to these carriers forming a biofilm, which effectively removes organic matter, nitrogen, phosphorus, and other pollutants from the wastewater through biodegradation.
The core of MBBR technology lies in the formation and renewal of the biofilm. The biofilm is a complex ecosystem composed of diverse microorganisms, including bacteria, fungi, protozoa, and metazoa. Through synergistic action, these microorganisms convert organic matter in the wastewater into carbon dioxide, water, and biomass, while transforming nutrients like nitrogen and phosphorus into harmless substances. Due to the mobility of the ca
rriers, the biofilm is continuously renewed, maintaining high activity and thereby enhancing treatment efficiency.
Technical Characteristics
High Efficiency: MBBR technology combines the high efficiency of the activated sludge process with the stability of the biofilm method, resulting in high treatment efficiency and stable effluent quality. Efficiency can be further improved by optimizing parameters such as carrier material, shape, and filling ratio.
Flexibility: MBBR reactors come in various shapes, are compact in structure, and require a small footprint, making them suitable for treating aquaculture tailwater at different scales. Furthermore, MBBR technology can be combined with other wastewater treatment processes to form hybrid systems, meeting diverse water quality and treatment requirements.
Resistance to Shock Loads: Due to the presence of the biofilm, MBBR technology exhibits strong resistance to shock loads. It can maintain stable treatment performance even under significant fluctuations in influent quality and quantity.
Low Energy Consumption: MBBR technology features low head loss, simple operation, easy management, and relatively low energy consumption. Energy consumption can be further reduced by optimizing parameters such as aeration intensity and mixing strength.
No Sludge Recirculation Required: In MBBR technology, microorganisms attached to the carriers move with the water flow. Sludge recirculation or cyclic backwashing is unnecessary. This simplifies the process flow and reduces operational costs.
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