Filler is a very important part of MBBR process.
At present, MBBR fillers commonly used in engineering are made of polyethylene or polypropylene plastics and have a small cylindrical shape. The diameter is about 25mm, and the height is 8-9 mm. There are multiple supports in the cylinder, and the outer wall has vertical striped fins.
When choosing mbbr filter media, it is usually judged according to the following indicators:
(1) Adhesion of biofilm
Biofilm adhesion capacity—the most important indicator for evaluating the quality of the filler.
Bio-attachment amount = protected surface area (related to the design structure of the filler) × biological attachment amount per unit surface area (related to the performance of the filler)
(2) Packing performance
Filler performance is the most important indicator for evaluating the amount of biological attachment of filler
①Filling surface performance
a. Surface structure:
It is generally considered that the surface roughness is large and the film forming speed is fast.
b. Surface potential:
Generally, microorganisms are negatively charged, and the surface of the filler is positively charged, which is suitable for the growth of microorganisms.
c. Hydrophilicity:
Microbes are hydrophilic particles, and the filler has good hydrophilicity and is suitable for the growth of microorganisms.
②Hydraulic performance
a. Porosity: The volume occupied by the filler, the porosity is high.
b. Shape and size: Affect the flow state of water flow and air flow.
③Fluidization performance:
Related to the density of the filler. The density of the filler should be 0.97-1.03, and fluidization can be achieved with less aeration or stirring.
For the material, shape selection, dosage design and type selection of the suspended carrier, please refer to the industry standard "High-density polyethylene suspended carrier filler for water treatment" (CJ/T 461-2014). The dosage is designed on the basis of surface load, and its parameters are affected by temperature, DO, organic load, matrix effluent concentration, PH value, etc.
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