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Filtration medium for eliminating ammonia nitrogen in water and method of preparing the same and filter element formed by said filtration medium
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A filter medium and water removal technology, applied in the field of filter medium and its preparation, can solve the problems of reduced effect, unfavorable ammonia removal, ineffectiveness, etc.
Inactive Publication Date: 2009-10-14
QIDI ELECTRIC GROUP
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Problems solved by technology
[0005] The concentration of ammonia in water after stripping treatment can be lower than 1 mg / L, but its effect on removing ammonia from low-temperature water is significantly reduced
[0006] The ion exchange method is an effective method for treating trace amounts of ammonia in water, but the traditionally used ion exchangers are not conducive to the removal of ammonia because they can preferentially exchange with other ions, and the water treated by the ion exchange method is not suitable for direct drinking
[0007] Nitrification and denitrification methods are suitable for removing ammonia nitrogen in industrial wastewater, and are basically ineffective for water treatment with low concentrations of ammonia
[0008] In addition, the technology currently under study also includes biological removal of ammonia nitrogen. Although it has a good effect on ammonia nitrogen removal, bacteria will flow out of the treated water, and it is easy to produce new pollutants - nitrite
Method used
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Embodiment 1
[0051] Weigh 100 grams of medical activated carbon with a particle size of 230-325 mesh (it can pass through a 230-mesh sieve but not a 325-mesh sieve, the same below), 200 grams of ultra-high molecular weight polyethylene with a molecular weight of 3.5 million, and 20 grams of zinc powder , put it into a mechanical stirrer to stir, take out the part and fill it into a tubular mold, press it under 1MPa hydraulic pressure, sinter at 250°C for 150 minutes, cool to 40°C and demould, and it can be obtained into a tubular shape with many micropores filter element.
Embodiment 2
[0053] Take by weighing 100 grams of acid-treated modified zeolite powder with a particle size of 120 to 200 meshes, 200 grams of ultra-high molecular weight polyethylene with a molecular weight of 4 million, 15 grams of zinc oxide powder, and 5 grams of lanthanum oxide, and stir in a mechanical stirrer. Take out the part and fill it into a tubular mold, press it under 0.6MPa hydraulic pressure, sinter at 280°C for 90 minutes, cool to 40°C and demould, and a tubular filter element with many fine pores can be obtained.
Embodiment 3
[0055] Weigh 50 grams of Na-type zeolite powder with a particle size of 200-270 mesh, 50 grams of medical activated carbon with a particle size of 230-325 mesh, 200 grams of ultra-high molecular weight polyethylene with a molecular weight of 4 million, 20 grams of zinc hydroxide powder, and 8 grams of lanthanum oxide. , put it into a mechanical stirrer to stir, take out the part and fill it into a tubular mold, press it under 0.8MPa hydraulic pressure, sinter at 180°C for 200 minutes, cool to 40°C and demould, and it can be obtained into microporous Tubular filter.
[0056] The above three filter elements were respectively placed in plastic housings of corresponding sizes, and the filtration experiment was carried out. Water containing 2 micrograms / liter, 5 micrograms / liter, and 10 micrograms / liter of ammonia nitrogen are filtered through the filter element, and then detected by gas phase molecular absorption spectrometry (HJ / T195-2005). The results showed that the filtration...
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Abstract
A method for preparing a filter medium, comprising mixing the following components, pressing them in a mold, sintering at a temperature of 150-400°C, and cooling: 100-300 parts by weight of ultra-high molecular weight polyethylene; 10-50 parts by weight of One or more combinations of zinc powder or zinc oxide or zinc hydroxide; 0-20 parts by weight of rare earth oxide; and 50-200 parts by weight of activated carbon or 10-200 parts by weight of modified zeolite powder or A combination of both. The above-mentioned method is used to prepare a filter medium or a filter element, which can be used to remove ammonia nitrogen in water. The invention realizes no secondary pollution, can be used for removing ammonia nitrogen with high efficiency, and the manufactured filter element is easy to use and low in cost. The water quality purified by the method is tested, and the removal efficiency of ammonia nitrogen reaches 75-90%.
Description
technical field [0001] The invention relates to a filter medium and a preparation method thereof, also relates to a filter element composed of the filter medium, and also relates to a method for removing ammonia nitrogen in water by using the filter medium or the filter element of the invention. Background technique [0002] Ammonia nitrogen is a common problem in drinking water in my country. In the past, the main source of ammonia nitrogen was human and animal excrement, and the pollution of ammonia nitrogen was not very serious. In recent years, the development of industry and agriculture has seriously polluted the environment and caused excessive ammonia nitrogen. Rainwater runoff and the loss of agricultural chemical fertilizers are the main sources of nitrogen. In addition, the discharge of industrial wastewater from chemical industry, metallurgy, petrochemical industry, paint pigment, gas, coking, chemical fertilizer, etc. also causes the increase of ammonia nitrogen...
Claims
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