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A method for efficiently preparing artificial zeolite from water plant sludge and its application

A technology of artificial zeolite and sludge, applied in water/sludge/sewage treatment, water pollutants, water/sewage treatment, etc., can solve the problems of poor reuse, incomplete treatment, high energy consumption, and achieve high utilization High, improve production efficiency, low energy consumption effect

Active Publication Date: 2018-09-11
HEBEI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a method for efficiently preparing artificial zeolite from waterworks sludge to solve the problems of high energy consumption, incomplete treatment and poor reuse degree in existing waterworks sludge treatment methods

Method used

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  • A method for efficiently preparing artificial zeolite from water plant sludge and its application
  • A method for efficiently preparing artificial zeolite from water plant sludge and its application
  • A method for efficiently preparing artificial zeolite from water plant sludge and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] like figure 1 The shown process flow prepares hydrogel artificial zeolite and bottom mud artificial zeolite, specifically as follows:

[0035] (1) Crush and dry the sludge from the water plant, then grind it into powder and spread it on a large porcelain boat, and bake it at 800°C for 1 hour, the inner and outer layers of soil will appear pottery red. white, indicating that the roasting is not sufficient, and it needs to be mixed and then roasted until it is completely pottery red to obtain marl ash. At this time, the main component of marl ash is SiO 2 and AlPO 4 Crystalline powder, its XRD of insufficiently sintered inner soil and fully sintered topsoil as figure 2 It can be seen from the figure that if the roasting is not sufficient, there will be more impurities;

[0036] (2) Dissolve 7.5 g of marl in 50 mL of 0.5 mol / L NaOH solution, add 5.0 g of NaAlO 2 , and mix well to obtain the reaction mixture, the molar ratio of Si and Al in the reaction mixture is 1:1, ...

Embodiment 2

[0041] (1) Mash and dry the sludge from the waterworks, then grind it into powder and spread it evenly in a large porcelain boat, and bake it at 750°C for 1.2 hours. Both the inner and outer layers of the sludge appear pottery red, indicating that the roasting is complete. Marl ash is obtained. At this time, the main component of marl is SiO 2 and AlPO 4 crystal powder;

[0042] (2) Dissolve 6.0 g of marl in 50 mL of 0.6 mol / L NaOH solution, and then add 4.8 g of NaAlO 2 , and mix well to obtain the reaction mixture, the molar ratio of Si and Al in the reaction mixture is 1:1.2, the solid-liquid ratio is 0.12 (the mass ratio of marl ash to NaOH solution is 0.12), and the microwave hydrothermal synthesis instrument (microwave The wavelength is 12.2 cm, the frequency is 2450 MHz), and the temperature is raised to 100°C (upper limit: 1.2 MPa) in 10 minutes, and maintained for 3 minutes; the temperature is raised to 195°C in 14 minutes, and the reaction is maintained for 30 minu...

Embodiment 3

[0047] (1) Smash and dry the sludge from the waterworks, then grind it into powder and spread it in a large porcelain boat, and bake it at 850°C for 0.8h. The inner and outer layers of the sludge are pottery red, indicating that the roasting is complete Marl ash is obtained. At this time, the main component of marl is SiO 2 and AlPO 4 crystal powder;

[0048] (2) Dissolve 7.5 g of marl in 50 mL of 0.4 mol / L NaOH solution, and then add 4.0 g of NaAlO 2 , and mix well to obtain a reaction mixture, the molar ratio of Si and Al in the reaction mixture is 1:0.8, the solid-liquid ratio is 0.15 (the mass ratio of marl ash to NaOH solution is 0.15), and the microwave hydrothermal synthesis instrument (microwave The wavelength is 12.2 cm, the frequency is 2450 MHz), the temperature is raised to 100°C (upper limit: 1.2 MPa) in 10 minutes, and maintained for 3 minutes; the temperature is raised to 205°C in 16 minutes, and the reaction is maintained for 60 minutes; naturally cooled to r...

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Abstract

The invention discloses a method for efficiently preparing artificial zeolites from water plant sludge. The method comprises the steps that 1, the water plant sludge is mashed, dried and ground into powder, and the powder is calcined to obtain sludge ash; 2, the sludge ash is dissolved into a sodium hydroxide solution, sodium metaaluminate is added, the solution is placed into a microwave hydrothermal synthesizer and heated for 10 min until the temperature is 100 DEG C, the temperature is kept for 3 min and then increased to 195 DEG C to 205 DEG C, reacting is conducted for 30-60 min by keeping the temperature, and cooling is conducted to obtain a reaction solution; 3, the reaction solution is subjected to a water bath, aged and separated to obtain upper-layer hydrogel and lower-layer solids; 4, seed crystal zeolites are added into the upper-layer hydrogel, crystallizing and aging are conducted, solids are taken, washed, dried and activated, and the hydrogel artificial zeolites are obtained; 5, the lower-layer solids are washed, dried and activated, and the bottom sludge artificial zeolites are obtained. The invention further discloses application of the artificial zeolites in wastewater treatment for ammonia nitrogen removal. The method is short in reaction time, low in energy consumption, simple, practical, good in controllability, high in removal rate of ammonia and nitrogen in wastewater and free of bottom sludge residues, and comprehensive utilization of the water plant sludge can be achieved.

Description

technical field [0001] The invention relates to the field of treatment and utilization of waterworks sludge and waste water treatment, in particular to a method for efficiently preparing artificial zeolite from waterworks sludge and its application. Background technique [0002] Zeolites are stable [(Si, Al)O 4 ] Tetrahedral non-metallic mineral material, the general chemical formula is A m x p o 2p ·nH 2 O, where A represents Na, K, Ca, Ba, Sr and other cations; X represents Al, Si elements, its structure is cage-like, and the skeleton contains exchangeable cations (Na, K, Ca, Ba, Sr). Silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron are cross-linked with each other. Because of the wide space and connected pores in its framework, it has strong adsorption performance; the structure of aluminum-silica-oxygen tetrahedron makes zeolite negatively charged, so the Contains exchangeable cation sites to maintain electrical neutrality; in addition, it also has two for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C02F1/28C02F101/16
CPCC01B39/02C01P2002/72C01P2002/85C01P2004/03C02F1/281C02F2101/16
Inventor 赵春霞张春辉丁月桥任淑霞张爱琳
Owner HEBEI UNIVERSITY
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