A Biological Aerated Filter (BAF) is an advanced biofiltration system that combines biological treatment and filtration in a single unit. It uses aerated media to support microbial growth for the removal of organic matter, ammonia, and suspended solids. Compact and energy-efficient, the BAF system offers high treatment efficiency, low footprint, and easy operation, making it ideal for municipal, industrial, and decentralized wastewater treatment applications.
Compact upward-flow biofilter offering efficient BOD and ammonia removal, stable effluent, low energy use, and minimal maintenance.
Simultaneously removes organic matter and ammonia nitrogen in a single reactor.
Space-saving structure with upward water flow for high treatment efficiency.
Operates without backwash pumps or blowers, reducing power requirements.
Provides consistent effluent quality even under fluctuating load conditions.
Suitable for municipal, industrial, and water reuse projects with easy integration.Simple structure and durable materials ensure long-term, trouble-free use.
Suitable for municipal, industrial, and water reuse projects with easy integration.
Weilan designs plans and drawings and supplies both standardized and bespoke water treatment systems, backed by over 200 completed projects.
Widely used in biodegradable water treatment projects, such as pretreatment of micro-polluted water sources, advanced treatment of sewage and reuse of reclaimed water, etc.
Combined with the denitrification deep bed filter, the total nitrogen in the effluent reaches extremely high requirements.
Combine with existing biological treatment process to further remove ammonia nitrogen and BOD.
Combine with the primary treatment BOD plus sedimentation tank process to further remove ammonia nitrogen.
Combined with DeepBed™ deep-bed filter, the effluent meets the three-level treatment standard, which meets the high standard requirements for intermediate water reuse.
Henan Weilan Water Treatment Technology Co., Ltd. (est. 2011) specializes in turnkey package
water treatment plants — modular, skid- and containerized systems pre-tested for rapid
on-site deployment.
Backed by an experienced R\&D and EPC team and ISO9001 quality management, Weilan
delivers engineered design, manufacturing, commissioning and lifecycle support for
municipal and industrial water projects.
Provide a total solution for safe drinking water and sewage treatment.
Full design services — standard modules and bespoke systems
Weilan’s Underdrain Filters are made of high-strength HDPE material, offering excellent corrosion resistance, structural stability, and long service life. This ensures reliable operation even under harsh water treatment conditions and minimizes maintenance requirements.
BAF systems offer high treatment efficiency, compact design, and low energy consumption. They eliminate the need for backwash pumps or blowers, operate with minimal maintenance, and deliver consistent performance even under variable loading or low-temperature conditions.
Selection depends on influent characteristics, flow rate, and effluent requirements. Weilan Water Treatment provides customized BAF designs, including media selection, reactor size, and aeration configurations, to ensure the system meets specific project needs and regulatory standards.
Yes. The BAF is suitable for both municipal and industrial applications. It effectively removes BOD, ammonia, and suspended solids from sewage, process water, or reclaimed water, making it ideal for upgrading existing treatment plants or integrating into new systems.
A properly designed BAF can achieve effluent with BOD ≤ 5 mg/L and ammonia nitrogen (NH₃-N) ≤ 1 mg/L. When combined with other treatment units like denitrification filters, it can meet stringent standards for advanced wastewater treatment and water reuse.
Yes. The compact design and flexible configuration of the BAF allow easy integration into existing plants without major civil modifications. It can also be used alongside primary or secondary treatment systems to enhance nitrogen and organic matter removal efficiency.
