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Sludge biological adsorption material for defluorination and preparation method thereof

A biological adsorption and sludge technology, applied in the direction of water pollutants, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of low pH value, high cost, and difficult precipitation of fine particles, and achieve less types and contents , the effect of easy operation

Active Publication Date: 2021-12-07
NANTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, this application solves the problem that the current existing treatment effect is poor, and the generated fine particles are difficult to precipitate, and are easily polluted by the membrane, the cost is high, the pH value of the treated water is low, and the chloride content sometimes Higher difficulty; provides a sludge biosorption material for defluoridation and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A sludge biosorption material for defluoridation and a preparation method thereof, the steps of which are:

[0031] Step 1: Pyrolyze the dried sludge powder at 600°C for 40 minutes to obtain sludge biochar;

[0032] Step 2, mix the sludge biochar and potassium acetate at a mass ratio of 1:0.5, then pyrolyze it again at 600°C for 40 minutes, centrifuge, wash, dry, and pulverize to obtain sludge-based biochar; the drying Dry temperature 60°C;

[0033] Step 3, dissolving aluminum chloride and cerium chloride in deionized water to obtain a mixed solution, and fully mixing with the biochar prepared in step 2; the molar ratio of aluminum chloride and cerium chloride is 2: 1; the mass volume ratio of the biochar and the mixed solution is 0.5g:50mL;

[0034] Step 4, then add sodium hydroxide solution dropwise to the mixed solution, adjust the pH of the solution to 7, centrifuge, wash, dry, and pulverize after fully stirring for 10 hours, and obtain a sludge biosorption materi...

Embodiment 2

[0036] A sludge biosorption material for defluoridation and a preparation method thereof, the steps of which are:

[0037] Step 1: Pyrolyze the dried sludge powder at 630°C for 50 minutes to obtain sludge biochar;

[0038] Step 2, mix the sludge biochar and potassium acetate at a mass ratio of 1:1.8, then pyrolyze it again at 630°C for 50 minutes, centrifuge, rinse, dry, and pulverize to obtain sludge-based biochar; the drying Dry temperature 80°C;

[0039] Step 3, dissolving aluminum chloride and cerium chloride in deionized water to obtain a mixed solution; first weigh 100 parts of sludge-based biochar, 5 parts of graphene, and 2- 4 parts, 1-3 parts of calcium carbide slag, and ultrasonically dispersed for 2 hours, then centrifuged at a speed of 3000rpm, vacuum-dried and ground, passed through a 200-400 mesh sieve to treat sludge-based biochar, and then press the treated sludge-based biochar The mass volume ratio of biochar and the mixed solution is 0.8g:50mL is fully mixe...

Embodiment 3

[0042] A sludge biosorption material for defluoridation and a preparation method thereof, the steps of which are:

[0043] Step 1: Pyrolyze the dried sludge powder at 650°C for 60 minutes to obtain sludge biochar;

[0044] Step 2, mix the sludge biochar and potassium acetate in a mass ratio of 1: 2, then pyrolyze it again at 650°C for 60 minutes, centrifuge, wash, dry, and pulverize to obtain sludge-based biochar; the drying Dry temperature 90°C;

[0045] Step 3, dissolving aluminum chloride and cerium chloride in deionized water to obtain a mixed solution, and fully mixing with the biochar prepared in step 2; the molar ratio of aluminum chloride and cerium chloride is 2: 1; the mass volume ratio of the biochar and the mixed solution is 1g:50mL;

[0046] Step 4, then add sodium hydroxide solution dropwise to the mixed solution, adjust the pH of the solution to 7.5, centrifuge, wash, dry, and pulverize after fully stirring for 12 hours, and obtain a sludge biosorption materia...

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Abstract

The invention discloses a sludge biological adsorption material for fluorine removal and a preparation method thereof. The method comprises the following steps:pyrolyzing a dry sludge powder for 40-60 min at 600-650 DEG C to obtain sludge biochar; mixing the sludge biochar with potassium acetate according to the mass ratio of 1:(0.5-2), then pyrolyzing at 600-650 DEG C for 40-60 minutes, and performing centrifuging, washing, drying and crushing to obtain sludge-based biochar; dissolving aluminum chloride and cerium chloride in deionized water to prepare a mixed solution, and fully mixing the mixed solution with the biochar prepared in the step 2; and dropwise adding a sodium hydroxide solution into the mixed solution, adjusting the pH value of the solution to 7-7.5, fully stirring for 10-12 hours, and performing centrifuging, washing, drying and crushing to obtain the sludge biological adsorption material for removing fluorine. When the adsorbent is used for adsorbing fluorides, the removal efficiency can reach 80% or above, and the adsorption capacity is 80-110 mg / g.

Description

technical field [0001] The invention belongs to the technical field of defluorination of waste water, and in particular relates to a sludge biological adsorption material for defluorination and a preparation method thereof. Background technique [0002] In recent years, the removal of fluoride in water mainly includes sedimentation flocculation method, membrane treatment method, ion exchange method and adsorption method. Among them, the precipitation flocculation method has the disadvantages of poor treatment effect and the formation of fine particles that are difficult to settle; the membrane treatment method is not suitable for high salinity and completely dissolved wastewater containing solid particles, and is prone to membrane pollution and has the disadvantages of high cost; The ion exchange method has the disadvantages of high cost of ion exchange resin, low pH value of treated water, sometimes high chloride content, and limited application and promotion. Only adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/14
CPCB01J20/041B01J20/06B01J20/08B01J20/20C02F1/281C02F1/283C02F2101/14B01J2220/4887
Inventor 叶长青李舒舒宋明珊童琳
Owner NANTONG UNIVERSITY
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