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Preparation method and application method of optimized gradation modified zeolite filter material for removal of ammonia nitrogen in micro-polluted water source water
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A technology for modifying zeolite and water source water, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of low mechanical strength and high loss rate of zeolite
Active Publication Date: 2020-07-07
HARBIN INST OF TECH
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[0003] The present invention aims to solve the technical problem of low mechanical strength of existing zeolite in water treatment and high loss rate in filter backwashing, and provides the preparation of modified zeolite filter material with optimized gradation for removal of ammonia nitrogen in slightly polluted water source water Method and how to use it
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specific Embodiment approach 1
[0014] Specific implementation mode 1: The preparation method of this embodiment for removing ammonia nitrogen in micro-polluted water source water and optimizing the gradation modified zeolite filter material is specifically carried out according to the following steps:
[0015] 1. Rinse the natural zeolite powder with water, then soak it in a sodium chloride solution with a concentration of 1.0mol / L for 24 hours, then rinse with water, dry, grind, and sieve to obtain a modified zeolite powder; the particle size of the natural zeolite powder is 0.5- 8mm;
[0016] 2. Mix the modified zeolite powder, water, sodium silicate and activated carbon powder obtained in step 1 evenly, press it into a cylindrical filter material with Φ=1~3mm, H=4~8mm, dry it, and put it into the muffle furnace. Calcining in a heating furnace, controlling the calcining temperature at 200-500°C, to obtain zeolite filter material A; wherein, in parts by mass, 100 parts of modified zeolite powder, 15-20 par...
specific Embodiment approach 2
[0019] Specific embodiment two: the difference between this embodiment and specific embodiment one is that natural zeolite powder in step one and natural granular zeolite in step three all contain silicon, aluminum, oxygen, potassium, calcium, sodium, magnesium and iron, wherein silicon , aluminum and oxygen account for more than 90% of the total mass. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0020] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: in step 1, the drying temperature is 105° C., and the drying time is 2 hours. Others are the same as in the first or second embodiment.
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Abstract
The invention relates to a preparation method and application method of optimally-graded modified zeolite filter material for removing ammonia nitrogen in micro-polluted source water, relates to the field of water treatment and is intended to solve the technical problem that in water treatment, existing zeolite having low mechanical strength experiences high loss in backflushing of a filter tank. The preparation method of the filter material comprises: I, modifying natural zeolite powder; II, calcining to prepare zeolite filter material A; III, modifying natural granulate zeolite to obtain zeolite filter material B; IV, optimally grading. The application method includes controlling filtering speed to 6-12 m / h. Characteristics of pollutants, application environment, economic cost and other factors are considered comprehensively, suitable modifying method and optimal gradation are selected, mechanical strength of zeolite and its unit adsorbing capacity for ammonia nitrogen are improved, the ability of the novel zeolite filter material to remove ammonia nitrogen is enhanced, and the filter material has important reference significance for the treatment of seasonal ammonia nitrogen in source water. The modified zeolite filter material prepared herein is suitable for water treatment.
Description
technical field [0001] The invention relates to the field of water treatment. Background technique [0002] Ammonia nitrogen is an important pollutant in slightly polluted source water and one of the main factors causing water eutrophication. In the conventional treatment process of drinking water, on the one hand, ammonia nitrogen in the water reacts with chlorine disinfectant to produce by-products such as chloramine and cyanogen chloride, which greatly increase the chlorine demand and the generation of disinfection by-products. On the other hand, due to the presence of ammonia nitrogen in the water treatment plant, the autotrophic bacteria in the water supply pipe network will multiply, which will cause water quality deterioration and pipe network corrosion. Zeolite is a natural mineral commonly used as an adsorbent in water treatment processes, but it also functions as an ion exchanger and filter. The removal of ammonia nitrogen by zeolite is based on the selective exc...
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