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Method for deep purification and efficient recovery of trace phosphorus in biochemical tail water

A deep purification and biochemical technology, applied in chemical instruments and methods, water/sewage treatment, neutralized water/sewage treatment, etc. The effect of low cost, lower operating cost and simple operation process

Active Publication Date: 2020-11-06
JIANGSU QICHUANG ENVIRONMENTAL SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent document with the application number 201810868976.9 discloses a "Phosphorus removal and phosphorus recovery system for tail water of urban sewage treatment plants and a method for adsorption and phosphorus removal and phosphorus recovery", but the phosphorus removal adsorption filter material APM in this patent is metal oxide particles , the particle size of the filter material is relatively fine, and it is easy to be lost and blocked; for the phosphorus-rich regenerated lye, calcium salt is directly used for calcium phosphate crystallization recovery, and the crystallization product particles are relatively fine, solid-liquid separation is difficult, and the purity of the recovered product is not high, and the phosphorus content Low, not conducive to subsequent recycling

Method used

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  • Method for deep purification and efficient recovery of trace phosphorus in biochemical tail water
  • Method for deep purification and efficient recovery of trace phosphorus in biochemical tail water
  • Method for deep purification and efficient recovery of trace phosphorus in biochemical tail water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051]Pass the sewage with TP concentration of 2.47mg / L and COD of 43.5mg / L through a quartz sand filter to obtain a filtrate with SS≤5mg / L; the filtrate is introduced into the first adsorption tower 2, and the first The adsorption device is filled with ultra-highly cross-linked polystyrene (developed and produced by Nanjing University) modified with dimethylamine groups on the surface to obtain the first adsorption effluent with COD≤15mg / L; the first adsorption effluent is introduced into the second adsorption tower 4 , into the second adsorption tower 4 filled with resin-based nano-zirconia (developed and produced by Nanjing University), the resin-based nano-zirconia is the D201 resin 11 loaded with HZO nanoparticles 1103 in the channel 1101, obtained after the second adsorption device absorbs The second adsorbed effluent with TP concentration ≤ 0.1 mg / L and the second adsorbed effluent is discharged.

[0052] Stop importing the first adsorption effluent to the second adsorp...

Embodiment 2

[0055] Pass the sewage with TP concentration of 4.38mg / L and COD of 56.3mg / L through a quartz sand filter to obtain a filtrate with SS≤5mg / L; the filtrate is introduced into the first adsorption tower 2, and the first The adsorption device is filled with ultra-highly cross-linked polystyrene (developed and produced by Nanjing University) modified with dimethylamine groups on the surface to obtain the first adsorption effluent with COD≤15mg / L; the first adsorption effluent is introduced into the second adsorption tower 4 , into the second adsorption tower 4 filled with resin-based nano-iron oxide (developed and produced by Nanjing University), the resin-based nano-iron oxide is the D201 resin 11 loaded with HFO nanoparticles 1102 in the channel 1101, obtained after adsorption by the second adsorption device The second adsorbed effluent with TP concentration ≤ 0.1 mg / L and the second adsorbed effluent is discharged (). .

[0056] Stop importing the first adsorption effluent to ...

Embodiment 3

[0059] Pass the sewage with TP concentration of 1.25mg / L and COD of 35.6mg / L through a quartz sand filter to obtain a filtrate with SS≤5mg / L; the filtrate is introduced into the first adsorption tower 2, and the first The adsorption device is filled with ultra-highly cross-linked polystyrene (developed and produced by Nanjing University) modified with dimethylamine groups on the surface to obtain the first adsorption effluent with COD≤15mg / L; the first adsorption effluent is introduced into the second adsorption tower 4 , import the second adsorption tower 4 and be filled with resin-based nano-lanthanum oxide (developed and produced by Nanjing University), the resin-based nano-lanthanum oxide is the D201 resin 11 loaded with HLO nanoparticles 1104 in the channel 1101, obtained after the second adsorption device absorbs The second adsorbed effluent with TP concentration ≤ 0.1 mg / L and the second adsorbed effluent is discharged.

[0060] When the TP concentration of the second a...

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Abstract

The invention relates to a method for deep purification and efficient recovery of trace phosphorus in biochemical tail water. The method comprises the following steps: removing organic matters in thebiochemical tail water by using high-crosslinking adsorption resin, and adsorbing phosphorus in the biochemical tail water by using a selective phosphorus removal composite material, thereby implementing deep removal of trace phosphorus in the biochemical tail water. Phosphorus-rich desorption liquid containing high-concentration phosphorus is obtained by desorbing the phosphorus removal compositematerial which is saturated through adsorption, phosphorus is converted into magnesium ammonium phosphate through crystallization and precipitation, magnesium ammonium phosphate is separated out, andtherefore trace phosphorus in biochemical tail water is efficiently recycled. By using the method, deep removal of trace phosphorus in the biochemical tail water can be realized, and the recovered magnesium ammonium phosphate has higher purity, can be used as an agricultural fertilizer, and can generate better environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to the field of advanced treatment of biochemical tail water, in particular to a method for deep purification and efficient recovery of trace phosphorus in biochemical tail water. Background technique [0002] Eutrophication of water body is one of the main environmental problems faced by countries all over the world. It is mainly caused by excessive nutrients such as nitrogen and phosphorus in water. Phosphorus is the main limiting factor of eutrophication in water body. It is generally believed that when water body eutrophication When the phosphorus concentration exceeds 0.02mg / L, it can be judged that the water body has entered a state of eutrophication. On the other hand, phosphorus is also a strategic resource and one of the indispensable elements for human life activities and modern agriculture. At present, human society is facing the dilemma of shortage of phosphorus resources but serious shortage of phosphorus pollution. ...

Claims

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Application Information

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IPC IPC(8): C02F9/12
CPCC02F1/001C02F1/285C02F1/42C02F1/488C02F1/66C02F9/00C02F2001/422
Inventor 许海民韩路毛亚张圣军
Owner JIANGSU QICHUANG ENVIRONMENTAL SCI & TECH
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