Industrial Application of Zeolite in Water Treatment
Natural zeolite use as Filter material
Filter material is the general name of water treatment filter material, mainly used for domestic sewage, industrial sewage, pure water, drinking water filtration.
from: Zeolitemin.com
Natural zeolite is a kind of Aluminosilicate mineral with white or brick red appearance. It belongs to weak acid cation exchanger. After artificial introduction of active components, it has new ion exchange or adsorption capacity, and the adsorption capacity is also increased accordingly. It is mainly used for the softening treatment of water for medium and small-sized boilers to remove Ca and Mg ions in water, so as to reduce the formation of scale in the boiler, reduce the corrosion of water testing metal, and extend the service life of the boiler. It can be used to remove phosphorus, lead and hexavalent chromium in wastewater treatment. The zeolite after failure can be used for the reuse of concentrated brine after countercurrent regeneration.
The Technical indexes of zeolite filter material are as follows:
Adsorption properties
The Specific surface area (m2/g): 122-355;
The adsorption capacity of SO2 is 47-58.2ml/g.
Cation exchange(CEC) performance
NH4+ exchange capacity (mmol / 100g)
Highest /lowest /Normal or Average: 150 /109 /127/58
K+ exchange capacity (mg / 100g)
Highest /Normal or Average: 18 /7513/ 19
Catalytic performance
Zeolite has large specific surface area and good crystallization performance. The toluene disproportionation catalyst made of modified zeolite is feasible and has high catalytic activity for p-xylene isomerization.
Acid and Heat Resistance
Acid Resistance: At 90 ℃ for 4 hours, when hydrochloric acid concentration is 1N, zeolite is not damaged; when hydrochloric acid concentration is 2N, zeolite is partially destroyed.
Heat Resistance: At 250 ℃, the crystal lattice changes slightly; At 500 ℃, the crystal lattice is basically destroyed; at 750 ℃, the lattice is completely destroyed; the experimental results show that the lattice damage temperature is 250 ~ 500 ℃, and the ignition time is 4 hours.
In the practical application process, zeolite can effectively remove COD, ammonia nitrogen and turbidity. The optimal hydraulic load is 2.2m/h (hydraulic retention time is 1.4 h), and the removal rates of COD, ammonia nitrogen and turbidity are 73.9%, 88.4% and 96.2% respectively. The corresponding average effluent concentrations are 43.4 mg/L, 3.5 mg/L and 3.7%, respectively NTU, can meet the requirements of relevant indicators in the recommended value of cooling water quality proposed by the State Environmental Protection Administration of China.
Zeolite and sand filter media were used as BAF filter media to treat textile wastewater. The results of cell count showed that the number of nitromonas and nitrobacteria on zeolite filter was 3.0 × 108 CFU / ml and 2.2 × 109 CFU / ml respectively, while that on sand filter was 4.5 × 108 and 6.5 × 108 CFU / ml, respectively In terms of the number of nitrifying bacteria, zeolite filter media is more suitable for microbial nitrification. In addition, from the removal of organic matter and TkN, the effect of BAF with zeolite as filter material is better than that with sand as filter material. BAF with zeolite as filter material can remove 86% ~ 92% cod, 99% BOD and 77% ~ 79% chroma in textile wastewater. The reason is that the specific surface area of natural zeolite filter material is larger than that of sand filter material, which is suitable for the attachment of microorganisms. Moreover, the ion exchange capacity of zeolite filter material is strong, which can adsorb NH4 + in water. The growth of nitrifying bacteria suitable for environment can transform NH4 + It is nitrate.The particle size can be made according to the needs, the flow pattern is good, the filtration cycle is long, the backwashing is easy, and the pollution interception ability is strong .
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