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Wastewater nitrogen and phosphorus removing method based on magnesite

A technology for denitrification, phosphorus removal, and magnesite, which is applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc. The effect of efficiency

Active Publication Date: 2015-09-30
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems in the prior art of the ammonium magnesium phosphate crystallization method for denitrification and phosphorus removal agents that the cost is too high and the precipitated product is impure, the present invention provides a method for denitrification and phosphorus removal of wastewater based on magnesite, using magnesite calcined products as Magnesium source, change the addition method of magnesium ammonium phosphate crystallization agent, solve the problem of high cost of ammonium magnesium phosphate crystallization agent, and improve the efficiency of nitrogen and phosphorus removal

Method used

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  • Wastewater nitrogen and phosphorus removing method based on magnesite
  • Wastewater nitrogen and phosphorus removing method based on magnesite
  • Wastewater nitrogen and phosphorus removing method based on magnesite

Examples

Experimental program
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Effect test

Embodiment 1

[0032] A kind of electroplating waste water, waste water water quality is as shown in table 1.

[0033] Table 1 Water quality of electroplating wastewater

[0034]

[0035] A kind of magnesite-based wastewater denitrification and dephosphorization method of the present embodiment, its steps are:

[0036] (1) Magnesite ore was purchased from Yingkou, Liaoning, crushed through a 100-mesh sieve, and calcined at 600-1200°C for 0.5h-3.0h to obtain a calcined product;

[0037] (2) add the calcined product that step (1) makes in waste water (the pH value of waste water is 0.62), the mol ratio of calcined product and phosphate in waste water is 0.9:1, and the magnetic stirring time is 10min, and magnesite ore dissolves The pH of the post-mix liquid is 7.2;

[0038] (3) Add ammonium chloride to the stirred waste water in step (2), the mol ratio of ammonium chloride and phosphate is 1:1, and the mol ratio with calcined product (calcined product is calculated by 100% magnesium oxide...

Embodiment 2

[0043] A chemical industry wastewater, wastewater quality see Table 2.

[0044] Table 2 Water quality of a chemical industry wastewater

[0045]

[0046] A kind of magnesite-based wastewater denitrification and dephosphorization method of the present embodiment, its steps are:

[0047] (1) Magnesite ore was purchased from Yingkou, Liaoning, crushed through a 100-mesh sieve, and calcined at 800°C for 1.5h to obtain a calcined product;

[0048] (2) Add the calcined product obtained in step (1) to the waste water, the molar ratio of the calcined product to ammonia nitrogen in the waste water is 0.2:1~1.6:1, magnetically stir for 10min, and the pH of the mixed liquid after the magnesite is dissolved is 4.0 ~8.5;

[0049] (3) Add sodium dihydrogen phosphate to the stirred wastewater in step (2), the molar ratio of ammonia nitrogen and phosphate in the wastewater is 1:1, adjust the pH to 9.5 with sodium hydroxide, stir for 30 minutes, and let stand for 30 minutes , forming mag...

Embodiment 3

[0054] A chemical industry wastewater, the wastewater quality is shown in Table 3.

[0055] Table 3 Water quality of a chemical industry wastewater

[0056]

[0057] A kind of magnesite-based wastewater denitrification and dephosphorization method of the present embodiment, its steps are:

[0058] (1) Magnesite ore was purchased from Yingkou, Liaoning, crushed through a 100-mesh sieve, and calcined at 900°C for 1 hour to obtain a calcined product;

[0059] (2) Regulate the pH value of waste water to 1~6 with hydrochloric acid, then add the calcined product that step (1) makes in waste water, the mol ratio of calcined product and ammonia nitrogen in waste water is 0.9:1, magnetic stirring 1min~20min, After the magnesite ore is dissolved, the pH of the mixed liquid is 7-9;

[0060] (3) add sodium dihydrogen phosphate in the waste water after stirring in step (2), the mol ratio of ammonia nitrogen and phosphate in the waste water is 1:1, and the mol ratio with calcined produ...

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Abstract

The invention discloses a wastewater nitrogen and phosphorus removing method based on magnesite, and belongs to the field of wastewater treatment. The wastewater nitrogen and phosphorus removing method comprises the following steps: (1) crushing magnesite, sieving the magnesite powder, and carrying out high-temperature calcination, so as to obtain a calcined product; (2) adjusting the initial pH value of wastewater, adding the calcined product obtained in the step (1) into the adjusted wastewater, adjusting the molar ratio of the calcined product to ammonia nitrogen or phosphate in the wastewater added with the calcined product, and stirring for a preset time; (3) adding sodium dihydrogen phosphate or ammonia chloride into the mixed product, so as to obtain magnesium ammonium phosphate crystals. The wastewater nitrogen and phosphorus removing method has the advantages that as the calcined product of magnesite is taken as a magnesium source, the adding method of ammoniomagnesium phosphate crystal medicament is replaced, the problem of relatively high medicament cost of the conventional ammoniomagnesium phosphate crystal method is solved, while the nitrogen and phosphorus removing efficiencies are improved; the recycled solid magnesium ammonium phosphate can be used for preparation of controlled-release fertilizers or cyclic utilization.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a method for treating high-concentration ammonia nitrogen or phosphate acidic wastewater, and more specifically relates to a method for removing nitrogen and phosphorus from wastewater based on magnesite. Background technique [0002] Magnesium ammonium phosphate crystallization technology has been widely concerned by scholars at home and abroad because of its characteristics of resource recovery of nitrogen and phosphorus in high-concentration ammonia nitrogen and phosphate wastewater. However, the crystallization technology of magnesium ammonium phosphate has the characteristic that chemical agents must be added, and the high cost of the agents hinders the promotion and application of the crystallization technology of magnesium ammonium phosphate. The main reason for the high cost of technical medicine. [0003] Aiming at the high cost of magnesium salts, domest...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/52C02F1/58
Inventor 余荣台任洪强梁潇谢志鹏汪长安马湘
Owner JINGDEZHEN CERAMIC INSTITUTE
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