SE—Structures and Environment: Pilot-Scale Development of a Bioreactor for the Treatment of Dairy Dirty Water
✍ Scribed by A.D. Cannon; K.R. Gray; A.J. Biddlestone; K. Thayanithy
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 201 KB
- Volume
- 77
- Category
- Article
- ISSN
- 0021-8634
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✦ Synopsis
Dirty water arising on dairy farms may have a biochemical oxygen demand (BOD ) of 3000}5000 mg/l and an ammoniacal nitrogen content of 500 mg/l. It can be a signi"cant cause of river pollution. An &on-farm' treatment scheme is being developed by The University of Birmingham, integrating a bioreactor and reed beds, that aims to treat dairy dirty water so that it can be discharged to a water course.
The paper describes pilot-scale trials of a submerged aerated "lter bioreactor to assess its suitability for adoption in the treatment scheme. A submerged aerated "lter employs a packed bed immersed in the wastewater undergoing treatment to provide a surface for microbial colonization. The process is well suited to performing nitri"cation in a farming context but is less appropriate if bulk BOD removal is its principal function. Nitri"cation in the pilot plant has been remarkably resilient following process upset and nitri"cation rates in the region of 0)25 kg [N]/m d at 153C have been observed.
Results relating to the plant's capacity for BOD removal and nitri"cation are presented. The in#uences of temperature, organic loading and various chemical species on nitri"cation are discussed and the costs of a full-scale bioreactor are estimated.