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- A2F Process (Anaerobic-aerobic Filters)
- The A2F process is a combined enhanced aerobic filter and aerated filter.
- A reduction in the generation of sludge and aeration volume can be achieved. Hitachi has extensive experience and know-how with this system (46 sites in Japan as of 2016).
- Approximately 2/3 of organic matter in the sewage water is gasified by the anaerobic reaction, resulting in a small quantity of sludge and low power usage and operating expenditure.
- This process is suitable for small-scale municipal sewage water treatment (less than 10,000m3/d).
Flow diagram and Structure
- Low sludge production
- Energy saving (low aeration volume)
- Easy operation (no need for sludge control)
- Stable performance
- Increase of small-scale WWTP in developing countries.(Urban→Regional)
- Necessity for low environmental impact for WWTP
- Insufficiency of skilled operators for WWTP
- Aerobic biological process has high OPEX
- Conventional anaerobic process has low OPEX, but controllability is inferior.