Preparation method and application of material for adsorption removal of organic matter and ammonia nitrogen

An organic matter, ammonia nitrogen technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, water pollutants, etc., can solve the problems of lack of nitrogen removal adsorbents and high operating costs, and achieve the effect of alleviating water shortages

Inactive Publication Date: 2019-11-12

ANHUI MEIZIRAN ENVIRONMENTAL TECH

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Problems solved by technology

Therefore, how to reduce the concentration of ammonia nitrogen in non-drinking water sources in nature to the third type of surface water environmental standard, which is less than 1mg/l, is a current research hotspot. The methods mainly include biological method, stripping method, chemical precipitation method, etc. Although the acidity and alkalinity and temperature of these water bodies can be changed, the operating cost is very high. The ad...

Abstract

The invention discloses a preparation method of a material for adsorption removal of organic matter and ammonia nitrogen. The preparation method comprises the following steps that (1) clinoptilolite is selected from natural zeolite, cleaned and elutriated through distilled water for three times; (2) stirring is conducted for 30 min in a high-speed stirring machine, and then precipitation is conducted; (3) upper turbid liquid is removed through a sieve net of 100 meshes; (4) the cleaned clinoptilolite is dried for 24 h in a drying oven at 100 DEG C; (5) a material A is prepared; (6) a materialB is prepared; (7) a material C is prepared; (8) a material D is prepared; (9) a material E is prepared; (10) a material F is prepared; (11) a material G is prepared; (12) a material H is prepared; (13) a material I is prepared; (14) a material J is prepared; and (15) a final adsorption material K is prepared. The natural zeolite and coal ash which are low in cost and easy to obtain are taken as basic raw materials, the natural zeolite is modified by NaCl and then mixed with a 4A molecular sieve prepared from the coal ash according to a certain ratio, thus the novel adsorption material is obtained, and the material has a great organic matter and ammonia nitrogen adsorption effect.

Application Domain

Other chemical processesWater contaminants +1

Technology Topic

Molecular sieveCoal +8

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Examples

Experimental program(1)

Example Embodiment

[0027] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention will be further explained below in conjunction with specific embodiments.

[0028] Such as figure 1 As shown, this embodiment provides a method for preparing a material for adsorbing and removing organic matter and ammonia nitrogen, including the following steps:

[0029] 1) Clinoptilolite is selected from natural zeolite and washed, and washed with distilled water three times;

[0030] 2) Stir in a high-speed mixer for 30 minutes, then settle;

[0031] 3) Use a 100 mesh screen to remove the turbid liquid on the upper part;

[0032] 4) Dry the cleaned zeolite in an oven at 100°C for 24 hours;

[0033] 5) Put the dried zeolite into a muffle furnace for pre-activation, burn it at 450°C for 60 minutes, and cool it down to room temperature to obtain material A, and put it into a sealed bag for later use;

[0034] 6) Prepare 5mol/L saturated NaCl solution to obtain material B, and put it in a sealed bottle for later use;

[0035] 7) Weigh 300g of material A and add 240ml of material B to obtain material C;

[0036] 8) Stir material C at 95°C for 3 hours, then wash it with distilled water, wash until it is neutral, dry it in an oven to make material D, and put it in a sealed bag for later use;

[0037] 9) The acid leaching residue of fly ash is reacted with 15% sodium hydroxide solution, and the supernatant is obtained after filtration, which is material E as the silicon source;

[0038] 10) The first-stage calcination product of extracting aluminum from fly ash is used as the aluminum source, and the main component is solid alumina, which is recorded as material F;

[0039] 11) Add material E, material F, sodium oxide and water according to the ratio of Na2O:SiO2:Al2O3:H2O=4:2:1:150, and stir to obtain material G;

[0040] 12) Put material G into the hydrothermal synthesis reactor, add 5% 4A molecular sieve as seed crystals, and crystallize at 95°C for 4 hours to obtain material H;

[0041] 13) Filter material H and wash until the pH of the filtrate is lower than 10 to obtain material I;

[0042] 14) Put the material I in an oven, dry and dehydrate at 90°C to obtain a solid powder 4A molecular sieve, denoted as material J;

[0043] 15) Weigh and mix material D and material J at a mass ratio of 1.2:1 to make the final adsorbent K.

[0044] Further, during the drying in the step 4), the zeolite should be taken out and stirred several times to prevent agglomeration after drying, and the color of the zeolite after drying is off-white.

[0045] The present invention also provides an application of a material for adsorbing and removing organic matter and ammonia nitrogen. The material K is loaded into an adsorption device containing sewage to remove organic matter and ammonia nitrogen in the sewage.

[0046] Further, the adsorption device includes a water tank body, the inner wall of the water tank body is fixed with a plurality of staggered baffles, one side of the water tank body is provided with a water outlet near the top thereof, and an installation is provided below the water outlet The filler discharge port on the water tank body, the other side of the water tank body is provided with a number of ultrasonic sensor rods located inside the water tank body and connected to the ultrasonic generator, between the ultrasonic sensor rod and the ultrasonic generator A transducer is connected, and a lifting pump connected by a water pipe is provided on the water tank body below the filling discharge port.

[0047] Using cheap and easily available natural zeolite and fly ash as basic raw materials, the natural zeolite is modified by NaCl and mixed with 4A molecular sieve made of fly ash in a certain proportion to obtain a new type of adsorbent material. Very good organic matter and ammonia nitrogen adsorption effect, organic matter removal rate is up to 70%, by reducing the content of organic matter to further enhance the ammonia nitrogen adsorption effect, and then through ultrasonic technology to strengthen the ammonia nitrogen adsorption effect, the ammonia nitrogen removal rate can reach up to 90%, especially suitable for low Concentrated ammonia-nitrogen wastewater is also suitable for the removal of ammonia nitrogen in natural water bodies, which can improve the water quality of Category 5 water to Category 3 or above, thereby alleviating the pressure of water shortage in China.

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