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Zeolite modification method for synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants from sewage

A cation and sewage technology, applied in the fields of adsorption water/sewage treatment, silicon compounds, aluminum silicate, etc., can solve the problems of high dependence on climate and environment, restricting the use of biological methods, and high construction costs, achieving low price, short cycle, The effect of high removal rate

Inactive Publication Date: 2014-01-29
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is generally believed that the biological treatment method is the most economical method to remove nitrogen and phosphorus in wastewater, but the biological method has its own limitations: large area, high construction cost, long cycle, and great dependence on the climate environment are the biological treatment methods. Problems that restrict the use of biological methods
[0006] At present, there is no report on the use of surfactant-modified zeolite to simultaneously remove nitrogen species containing both cations and anions, as well as anion phosphorus species in water.

Method used

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  • Zeolite modification method for synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants from sewage
  • Zeolite modification method for synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants from sewage
  • Zeolite modification method for synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants from sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1 Modified zeolite.

[0023] The preparation steps of the modified zeolite in this embodiment are as follows.

[0024] First, use a grinder to pulverize the natural zeolite, pass it through a 100-mesh metal sieve (aperture 0.174mm), and seal it for later use.

[0025] Then, weigh 100g of 100-mesh zeolite with a balance, and add concentrations of 1.5g / L, 3.0g / L, 5.0g / L, 10.0g / L, 15.0g / L, 20.0g / L, 25.0g / L, 30.0 g / L, 40.0g / L modifier solution 500mL, placed in a constant temperature oscillator (25°C, 200r / min) and vibrated for 24 hours, then took it out and dried it naturally to obtain the modified zeolite powder.

Embodiment 2

[0026] Example 2 Modified zeolite to ammonia nitrogen (NH 4 + -N) adsorption capacity.

[0027] Weigh 1 g of the modified zeolite dry sample with a modifier concentration of 1.5 g / L in Example 1 and place it in a 50 mL centrifuge tube.

[0028] Join NH separately 4 + -N concentration is 25mg / L, 50mg / L, 100mg / L, 150mg / L, 200mg / L, 250mg / L ammonium chloride solution 50mL.

[0029] Take it out at 25°C and shake at a constant temperature of 200r / min for 8 hours, centrifuge it in a high-speed centrifuge at a speed of 16000r / min for 5min, and take the supernatant to measure the results.

[0030] Carry out successively in embodiment 1 modifier concentration is 3.0g / L, 5.0g / L, 10.0g / L, 15.0g / L, 20.0g / L, 25.0g / L, 30.0g / L, 40.0g / L Ammonia nitrogen (NH 4 + -N) adsorption experiment, measurement results, ammonia nitrogen (NH 4 + -N) was determined by salicylic acid spectrophotometry. Effect of modifier concentration on zeolite adsorption of ammonia nitrogen (NH 4 + -N) effect s...

Embodiment 3

[0032] Embodiment 3 modified zeolite to nitrate (NO 3 - -N) adsorption capacity.

[0033] Weigh 1 g of the modified zeolite dry sample with a modifier concentration of 1.5 g / L in Example 1 and place it in a 50 mL centrifuge tube.

[0034] Add NO separately 3 - -N concentration is 25mg / L, 50mg / L, 100mg / L, 150mg / L, 200mg / L, 250mg / L potassium nitrate solution 50mL.

[0035] Take it out at 25°C and shake at a constant temperature of 200r / min for 8 hours, centrifuge it in a high-speed centrifuge at a speed of 16000r / min for 5min, and take the supernatant to measure the results.

[0036] Carry out successively in embodiment 1 modifier concentration is 3.0g / L, 5.0g / L, 10.0g / L, 15.0g / L, 20.0g / L, 25.0g / L, 30.0g / L, 40.0g / L Modified zeolite for nitrate (NO 3 - -N) adsorption experiment, determination results, nitrate (NO 3 - -N) was measured by UV spectrophotometry. Effect of modifier concentration on zeolite adsorption of nitrate (NO 3 - -N) effect see attached figure 2 . ...

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Abstract

The invention discloses a zeolite modification method for synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants from sewage. The zeolite modification method comprises the following steps: with hexadecyl trimethylammonium bromide (HDTMA-Br) as a modified agent, soaking natural zeolite powder, placing in a constant temperature oscillator (25 DEG C, 200r / min), oscillating for 24 hours, and naturally airing. The zeolite modification method is simple to operate and low in cost; in addition, pH is neutral, the pH value of raw water is not changed in a water treatment process, and then, no influence is caused on subsequent treatment processes. The zeolite modification method has the outstanding characteristic that three ions, namely the cationic and anionic nitrogen and anionic phosphorus pollutants can be synchronously removed. Experiments prove that when the pH is neutral, the concentration of an optimal modifying agent prepared from modified zeolite is 30g / L, and under such condition, compared with natural zeolite, the modified zeolite has the advantages that the effects of removing nitric nitrogen and phosphate can be remarkably improved, the removal rate of the nitric nitrogen is increased to 55% from 0, and the removal rate of the phosphate is reduced to 34% from 0; meanwhile, the removal effect on ammonia nitrogen is not remarkably reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to a zeolite modification method capable of synchronously removing cationic and anionic nitrogen and anionic phosphorus pollutants in sewage. Background technique [0002] While rapid urbanization has brought huge economic benefits to people, the discharge of a large amount of domestic sewage and industrial wastewater and the use of pesticides have caused huge pollution to the environment. Excessive nitrogen and phosphorus have become the primary factor for the aggravation of eutrophication in water bodies. Nitrogen and phosphorus removal has become an urgent problem to be solved. The forms of nitrogen and phosphorus in polluted water are mainly ammonia nitrogen, nitrate nitrogen, phosphate and polyphosphate. Therefore, the key to denitrification and phosphorus removal is to remove ammonia nitrogen, nitrate nitrogen, orthophosphate and polyphosphate in water. [0003] It i...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/16B01J20/32
Inventor 梁英姚景胡牧陶权马效芳
Owner SICHUAN UNIV