The technical key of the MBBR method is a biological filler that has a specific gravity close to water and is easy to move freely with water under slight agitation.
Usually the filler is made of polyethylene plastic, the shape is a small cylinder, there are supports in the cylinder to form pores, and the outer wall has protruding vertical fins. The hollow part of the filler occupies 0.80-0.95 of the entire volume, that is, it is filled with water. In the container with filler, the volume of water in each filler is 80%-95%.
Taking into account the rotation of the filler and the total container volume, the filling ratio of the filler is defined as the proportion of the space occupied by the carrier. In order to achieve the best mixing effect, the filling ratio of the filler is 25%-65%.
Theoretically, the total specific surface area of the filler is defined by the number of specific surface areas per unit volume of the biological carrier, generally 500m2/m3-1300m/m3.
This type of biological filler is conducive to the attachment and growth of microorganisms on the inside of the filler, forming a relatively stable biofilm, and is easy to form a fluidized state.
When the pretreatment requirements are low or the sewage contains a large amount of fibrous material
(for example, the primary sedimentation tank is not used in municipal sewage treatment or when the papermaking wastewater containing a large amount of fiber is treated)
Use biological fillers with smaller specific surface area, larger size and larger pores.
When there is a better pretreatment or used for nitrification, when the ammonia nitrogen concentration is higher, the biological filler with a large specific surface area is used.
If you have interest, please contact Doris
Whatsapp/Wechat: +86 13298186953
Email: doris@juntaiplastic.com
