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A biological filter material and formulation technology, applied in sustainable biological treatment, chemical instruments and methods, biological water/sewage treatment, etc., can solve the problems of poor gas-water uniformity, poor shearing effect of filter material, and easy detachment of biofilm. , to achieve the effect of low granulation equipment and cost, low filter material cost and good shearing effect
Inactive Publication Date: 2008-10-29
广州市金龙峰环保设备工程股份有限公司
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Problems solved by technology
(1) Due to the uniform shape and low resistance of the circular filter material, the filter material has poor shearing effect on air and water, and it is difficult for the air and water to be uniform after passing through the filter material layer.
Especially when the filter material is easy to form balls after a period of operation, due to the small resistance between the filter materials, the backwash water gas is easy to flow away locally, resulting in a vicious cycle. Often, the longer the biological aerated filter runs, the worse the uniformity of air and water.
(2) Due to the relative
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Example 1
Biological filter material, according to weight percentage, its components are as follows:
75% clay, 20% fly ash
Raw coal 4%, pore former 1%.
The microporous pore former is a powdery mixture of calcium carbonate and calcium carbide powder with a weight ratio of 1:1.
Production Method:
Clay the clay to less than 100 mesh, then mix the clay, fly ash, raw coal, and pore-forming agent into dry powder according to the formula, add 18% of the total weight of solid water, mix uniformly and granulate it, dry it and calcinate it in the kiln. It is 1200°C, cooled and sieved after leaving the kiln, and the particle size is selected to be 4-10mm.
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Example 2
Biological filter material, according to weight percentage, its components are as follows:
80% clay, 15% fly ash
Raw coal 3%, microporous pore former 2%.
The microporous pore former is a powdery mixture of calcium carbonate and calcium carbide powder with a weight ratio of 1:1.
Production Method:
Clay the clay to less than 100 mesh, then mix the clay, fly ash, raw coal, and pore-forming agent into dry powder according to the formula, add 18% of the total weight of solid water, mix uniformly and granulate it, dry it and calcinate it in the kiln. It is 1200°C, cooled and sieved after leaving the kiln, and the particle size is selected to be 4-10mm.
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Abstract
The invention discloses a biological filtering material and a preparation method thereof. The biological filtering material is prepared from clay 70-80 wt%, fly ash 15-25 wt%, raw coal 3-5 wt% and pore forming agent 0.2-3 wt% by pulverizing clay into 100 mesh; mixing dry powders of clay, fly ash, raw coal and pore forming agent; mixing with water 18 wt% and pelletizing; drying; calcining at 1,050-1,200 DEG C in a kiln; taking out; cooling; sieving; and selecting particles with the diameter of 4-10mm. The biological filtering material has good shearing effect to gas and water, and can prevent bubble aggregation; and compared with ceramsite filtering material, its oxygen utilization is improved by 20-30%. Biomembrane grows the surface of the filtering material and the internal surfaces of pores in a great amount, so influence of backwashing on the internal surfaces of the pores is not great and the quality fluctuation of the discharged water after backwashing is also small. The filtering material is almost spherical and has low pelletizing requirement, and the cost of a pelletizing device and a pelletizing process is relatively low. The prepared filtering material has high strength and void volume.
Description
technical field The invention relates to a filter material for an aerated biological filter. Background technique The biological filter material is the core component of the biological aerated filter. The choice of biological filter material affects the treatment effect and operation control of the biological filter. At present, the filter materials used in the biological aerated filter are divided into inorganic filter materials and organic filter materials. Inorganic filter media are widely used due to the abundant source of raw materials and the ease of large-scale production. Inorganic filter materials include gravel, zeolite, slag, and ceramsite filter materials. Among them, the round ceramsite filter material has been researched and applied more due to its advantages of small resistance and good chemical stability. However, during the use of the round ceramsite filter material, there are some problems as follows: (1) Due to the uniform shape and low resistance o...
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