Zeolite is a polar substance is very polar sorbents for polar molecules and unsaturated organic molecules, such as halogenated hydrocarbons has a strong adsorption of non-polar molecules in large molecular polarizability also have a higher selective adsorption advantage. There are two zeolite: clinoptilolite filter and activated zeolite. First, natural zeolite clinoptilolite natural zeolite is aluminum silicate minerals, the appearance of white or brick red, is a weak acid cation exchangers, artificially introduced into the active component, it has a capacity of new ion exchange or adsorption, adsorption capacity also increases proportionately. Mainly for small and medium sized boiler water softening treatment to remove water calcium and magnesium ions, thereby reducing the formation of boiler scale, reduce water measured corrosion of metals, extend the life of the boiler. In wastewater treatment, water can be used to remove phosphorus and lead and hexavalent chromium. Zeolites can be used after failure after repeated use brine countercurrent regeneration. Physical and chemical properties of natural clinoptilolite indicators: the proportion g/cm3 2.0 ~ 2.6 clay content% ≤ 1.0 Bulk density g/cm3 1.6 Moisture% ≤ 1.5% ≤ 1.0 wear rate of sodium ion exchange capacity g / cm ≥ 800 Second, activated zeolite Activated Zeolite is a natural zeolite activated through a variety of special process, the adsorption performance stronger than the natural zeolite, ion exchange performance is also better, not only to remove the water turbidity, color, odor, and harmful heavy metals in water, Such as: chromium, cadmium, nickel, zinc, mercury, iron ions and organic compounds: phenols, BHC, DDT, three nitrogen, ammonia nitrogen, phosphate ions and other substances with adsorption exchange interaction, but also conducive to all kinds of micro-pollutants removal and flooding fluid does not contain toxic, harmful substances, removal of iron, fluoride effect is more significant. So the ideal filter activated zeolite is a new industrial water supply, wastewater treatment and water filtration. Performance analysis of activated zeolite: Density g/cm3 1.8 ~ 2.2 filtration rate m / h 4 ~ 12% wear rate density g/cm3 1.4 <0.5 porosity% ≥ 50% broken rate <1.0 Specific surface area m2 / g 500 ~ 800 Clay content% <1.0% ≤ 0.1 hydrochloric acid soluble rate swap working full capacity mg / g 2.2 ~ 2.5 Third, technical indicators zeolite adsorption properties of a specific surface area (m2 / g): 122 ~ 355; adsorption of SO2. capacity of 47 ~ 58.2ml / g. 2 cation exchange properties NH4 + exchange capacity (mmol/100g) maximum or minimum general average: 150 109 127.58 K + exchange capacity (mg/100g) Highest general or average: 18.75 13.19 3 catalytic properties of zeolite has a larger surface area, a more good crystallization properties proved by the catalytic test for toluene disproportionation, the modified zeolite catalyst for the production is feasible toluene disproportionation, xylene isomerization have high catalytic activating. 4 acid and heat resistance Acid resistance: 90 ℃ incubated four hours at a concentration of 1N hydrochloric acid is not damaged when the zeolite; 2N hydrochloric acid and the concentration of partial destruction of the zeolite. Heat resistance: 250 ℃, the slight change in the lattice; when 500 ℃, the basic crystal lattice damage; when 750 ℃, lattice completely destroyed; experiments show that the lattice damage temperature 250 ~ 500 ℃, ignition time 4 hours. Fourth, zeolite BAF precautions with zeolite as filter can effectively remove COD, ammonia and turbidity, hydraulic load test conditions optimal for the 2.2m / h (HRT 1.4h), this time on the COD, ammonia and turbidity removal efficiency of 73.9%, 88.4% and 96.2% respectively corresponding average effluent concentration of 43.4mg / L, 3.5mg / L and 3.7NTU, can reach the State Environmental Protection Administration, Tianjin University, proposed cooling back water quality recommended value (| | |) the requirements of the relevant indicators. Using zeolite and sand as BAF media treatment of textile wastewater. Cell count results showed that the number of the zeolite growth Nitrosomonas bacteria and nitrifying bacteria were 3.0 × 108 and 2.2 × 109 CFU / mL. While the growth of the number of the sand were 4.5 × 1086.5 × 108 CFU / mL. nitrifying bacteria come from a number of point of view, more suitable for microbial nitrification on the zeolite, the other from the removal of organics and TKN point of view, the effect of zeolite as filter BAF better than to sand filter The BAF. BAF using zeolite as filter media allows textile wastewater COD removal rate of 86% ~ 92%, BOD removal rate of 99%, 77% color removal at -79%, which is due to the specific surface area of ??natural zeolite greater than the sand filter, suitable microbial attachment and zeolite ion exchange capacity, can absorb water NH4 +, and suitable environment for the growth of a large number of nitrifying bacteria that NH4 + is converted to nitrate. Particle size can be produced according to need, the flow pattern, long filter cycles, backwash easy, interception capability. 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