Ceramic membrane is a kind of inorganic membrane, which has the following characteristics: a wide range of raw materials, low price, compared with ultrafiltration and reverse osmosis membrane, has a great price advantage; High mechanical strength, no deformation under large pressure difference, easy to backwash under high pressure and stable operation; Ceramic film high temperature resistance, can be used under 1000℃ stable, suitable for high temperature, high viscosity fluid (water and gas); Good chemical stability, can resist microbial degradation, erosion of organic solvents, corrosive gases and microorganisms, show good stability, can be used for strong acid cleaning; Long service life, can be used for more than 10 years, no need to replace ceramic membrane tube; According to the application requirements, the film can be coated with ultrafine particles with different grains, and the film aperture can be adjusted.
Disadvantages of ceramic film
The disadvantages of ceramic film are: heavy mass, large volume, general single equipment treatment water 300t/d, installation, maintenance needs to have lifting equipment; Ceramic tube is fragile, so there are certain requirements for transportation, installation and maintenance. Xinjiang fangting needle textile co., LTD. Is a company mainly engaged in producing high quality pure cotton underwear. The original set of waste water treatment equipment has a treatment capacity of 600nl/d, which cannot meet the discharge standard due to the decline of the efficiency over time. Due to the shortage of water resources in the area where the enterprise is located, it is required that the waste water treatment can be reused after reaching the standard. Therefore, the transformation of the waste water treatment station aims to treat the waste water at 1000m/d with a recycling rate of over 30%. Considering that the pure cotton knitted fabric is dyed with reactive dye and the salt content in the dyeing bath is high, the ceramic membrane treatment scheme is adopted in cooperation with donghua university.
Ceramic membrane pretreatment generally commercial ceramic membrane wall thickness of about 1mm, and bending irregular state, most surface aperture distribution in 5 ~ 350l,Lm, effective aperture in l0 ~ 100Ixm. In this project, the effective pore diameter was assumed to be: silica nano powder with different particle sizes, with a concentration of 1g/L, 20rain was treated with a flow rate of 0.02m/s under the condition of 0.O1MPa, and its passing mass was measured by mass method.
The nominal aperture is limited to 60% of the transmittance of nanoparticles.
The surface pore diameter of the purchased substrate ceramic film was distributed in 5 ~ 350Ixm with an effective pore diameter of 100txm. The surface pore diameter was distributed in 5 ~ 50m with an effective pore diameter of 5m by applying 10rain with standard zirconia nano-powder of 20Ixm and 5m respectively.