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Method for synchronously recovering nitrogen and phosphorus from wastewater by magnesium hydroxide modified sepiolite

A technology of magnesium hydroxide and sepiolite, which is applied in chemical instruments and methods, alkaline orthophosphate fertilizers, applications, etc., can solve the problems of difficult separation of water, increased difficulty in recovery, and limited development of industrialization, etc. The effect of large adsorption capacity

Inactive Publication Date: 2018-07-27
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small crystals of magnesium ammonium phosphate, it is difficult to separate from water, which makes recycling more difficult and limits its industrial development.

Method used

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  • Method for synchronously recovering nitrogen and phosphorus from wastewater by magnesium hydroxide modified sepiolite
  • Method for synchronously recovering nitrogen and phosphorus from wastewater by magnesium hydroxide modified sepiolite
  • Method for synchronously recovering nitrogen and phosphorus from wastewater by magnesium hydroxide modified sepiolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation of embodiment 1 magnesium hydroxide modified sepiolite

[0038] Take raw sepiolite powder, grind it into fine powder, pass through a 200-mesh sieve, mix it with water at a mass ratio of 2:10, stir at a speed of 300r / min for 20min to make a suspension, and mark it as component A;

[0039] Component A continues to stir, slowly add 25% ammonia water and component A to component A in a mass ratio of 2:10, increase the hydroxyl group for activation, continue stirring at 200r / min for 60min, and mark it as component B;

[0040] MgCl 2 Prepare an aqueous solution with water at a mass ratio of 2:10, marked as component C;

[0041] Component C and component B are mixed at a mass ratio of 1:1, marked as component D;

[0042] Dosing sodium dodecylsulfonate and component D into component D at a mass ratio of 0.1:10, marked as component E;

[0043] Component E was stirred in a water bath at 60°C for 3 hours at a rotational speed of 200r / min, left to stand for 12 ho...

Embodiment 2

[0046] Nitrogen and phosphorus (1) in the simulated waste water was recovered by utilizing the prepared magnesium hydroxide modified sepiolite under the laboratory conditions of embodiment 2

[0047] Take 1L of the simulated wastewater prepared in the laboratory and place them in beakers I and II respectively, and the initial nitrogen and phosphorus concentrations are both 100mg / L. Adjust the pH of the simulated wastewater to 8.5 in advance, add 0.3g of natural sepiolite to beaker I, add 0.3g of modified sepiolite prepared in Example 1 to beaker II, stir rapidly for 20 minutes and then slowly stir After 30 minutes, let it stand for 2 hours, filter, and measure the concentration of ammonia nitrogen and total phosphorus in the supernatant by spectrophotometry. The concentration of ammonia nitrogen in the supernatant of No. 1 beaker was 79.3 mg / L, the removal rate was 20.7%, the concentration of total phosphorus was 76.4 mg / L, and the removal rate was 23.6%; the concentration of ...

Embodiment 3

[0048] Nitrogen and phosphorus (2) in the simulated waste water was recovered by utilizing the prepared magnesium hydroxide modified sepiolite under the laboratory conditions of embodiment 3

[0049] Take 1L of simulated wastewater configured in the laboratory, and the initial nitrogen and phosphorus concentrations are both 500mg / L. Adjust the pH of the simulated wastewater to 8.5 in advance, add 1.0 g of the modified sepiolite prepared in Example 1, stir rapidly for 20 minutes, then stir slowly for 30 minutes, let stand for 2 hours, filter, and measure the supernatant ammonia nitrogen, total phosphorus concentration. The concentration of ammonia nitrogen in the supernatant was 91.5mg / L, the concentration of total phosphorus was 18.0mg / L, and the removal rates were 81.7% and 96.4% respectively.

[0050] After the sludge was recovered, it was dried at 40°C, and XRF component analysis was performed. Compared with the content of magnesium in Example 1, the content of magnesium i...

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Abstract

The invention provides a method for synchronously recovering nitrogen and phosphorus from wastewater by magnesium hydroxide modified sepiolite. The magnesium hydroxide modified sepiolite is prepared from natural sepiolite is used as a raw material, MgCl2 as a magnesium source and alkyl sulfonate as a surfactant. Nitrogen and phosphorus in medium and high concentration wastewater are synchronouslyrecovered by adsorbability of the sepiolite in combination with a struvite precipitation method on the basis of the prepared modified sepiolite as a precipitant, and the recovered filter residues arecollected and dried for use as a soil conditioner or slow release fertilizer. The method has the advantages of being energy saving and environmentally friendly; according to the treated wastewater, ammonia nitrogen concentration and total phosphorus concentration are both well reduced, and synchronous recovery of nitrogen and phosphorus is realized.

Description

technical field [0001] The invention relates to the technical fields of waste water treatment technology and environmental resource recycling, in particular to a method for synchronously recovering nitrogen and phosphorus in waste water by using magnesium hydroxide modified sepiolite. Background technique [0002] Upgrading of the existing sewage treatment plant (level 1 B to level 1 A) involves the advanced treatment of ammonia nitrogen, total nitrogen, and total phosphorus. After biochemical treatment, the sewage with COD less than 60mg / L can be used to remove total nitrogen and total phosphorus It will be very difficult, because the site no longer has the process and equipment conditions for increasing ammonia nitrogen and total phosphorus removal. The discharge of industrial sewage and the development of agriculture, animal husbandry and breeding will bring about the advanced treatment of ammonia nitrogen, total nitrogen, and total phosphorus in rivers, ditches, and wetl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/12B01J20/30C02F1/28C05B7/00C05G3/00C02F101/16C02F101/10
CPCB01J20/041B01J20/12C02F1/281C02F2101/105C02F2101/16C05B7/00C05G3/00
Inventor 杜玉成张丰李强祁超王学凯李杨吴俊书
Owner BEIJING UNIV OF TECH
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