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Membrane adsorbent for recycling nitrogen and phosphorus resources from waste water as well as preparation method and application thereof

A technology of membrane adsorption and adsorbent, which is applied in the field of membrane adsorbent and its preparation for the recovery of nitrogen and phosphorus resources in wastewater. It can solve the problems of long reaction time, difficult regeneration, and unqualified effluent quality in biological methods, and achieve adsorption and desorption. Effect of good performance, good mechanical and thermal stability, good filtration and adsorption function

Inactive Publication Date: 2011-10-12
天津森诺过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these methods all have some economic or technical problems more or less
The biological method has a long reaction time, complex process, high management requirements, and is affected by toxic substances. The denitrification and phosphorus removal effect is unstable, and the effluent water quality sometimes cannot meet the standards. Therefore, effective deep denitrification and phosphorus removal still has certain difficulties and limitations.
The main disadvantage of the flocculation-sedimentation method is that a large amount of flocculant needs to be added, and a large amount of sludge that is difficult to handle is generated, resulting in high operating costs.
[0005] The adsorption method overcomes the shortcomings of the biological method and flocculation-sedimentation method, such as high operating cost, large amount of sludge that is difficult to treat, and unstable operation. method
In wastewater treatment, especially in industrial wastewater treatment, activated carbon adsorption method is widely used, but activated carbon adsorbent has the following disadvantages: poor selectivity, limited scope of application, high regeneration cost, difficult regeneration, etc.

Method used

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  • Membrane adsorbent for recycling nitrogen and phosphorus resources from waste water as well as preparation method and application thereof
  • Membrane adsorbent for recycling nitrogen and phosphorus resources from waste water as well as preparation method and application thereof
  • Membrane adsorbent for recycling nitrogen and phosphorus resources from waste water as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The formula design of the mass percentage of the membrane adsorbent casting liquid is: 16wt% polyvinylidene fluoride (produced by Sanaifu Company); 11wt% cation exchange resin powder [Polylite Co., Ltd., model MN500] (polyvinylidene fluoride / resin= 59 / 41), the average particle size is 31.78μm; 16wt% polyethylene glycol; 2wt% polyvinylpyrrolidone and 55wt% N,N dimethylacetamide.

[0032] The process of making membrane adsorbent is as follows: first add 5.5g resin to 27.5g DMAc and stir, after the dispersion is uniform, add 8g PEG and 1g PVP, add 8g polyvinylidene fluoride several times after the solid is completely dissolved to ensure that the ion exchange resin is in The polymer is evenly dispersed. After adding PES, the solution is stirred at 40~50℃ for 4~12 hours; after the dissolution and dispersion are complete, let it stand for 24 hours to degas and prepare it into a casting liquid; artificially place the casting liquid on the glass After scraping the plate into a fla...

Embodiment 2

[0034] The formula design of the mass percentage of the membrane adsorbent casting solution is: 16wt% polyethersulfone [produced by BASF]; 16wt% cation exchange resin powder [Polylite Co., Ltd., model MN500] (polyethersulfone / resin=50 / 50), The average particle size is 20μm; 16wt% polyethylene glycol; 2wt% polyvinylpyrrolidone and 50wt% N,N dimethylacetamide.

[0035] The process of making membrane adsorbent is as follows: first add 8g resin into 24gDMAc and stir, after the dispersion is uniform, add 8gPEG and 1gPVP, add 8g PES several times after the solid is completely dissolved to ensure that the ion exchange resin is dispersed in the polymer Evenly, after adding PES, stir the solution at 40~50℃ for 4~12 hours; after dissolving and dispersing completely, let stand and degas for 24 hours to prepare casting liquid; manually scrape the casting liquid on the glass plate to make the thickness After the flat membrane is 0.20~0.30mm, it is solidified and formed at 20~30°C; then the re...

Embodiment 3

[0037] The formula design of the total mass percentage of the membrane adsorbent casting solution is: 16wt% polyethersulfone [produced by BASF]; 24wt% cation exchange resin powder [Polylite Co., Ltd., model MN500] (polyethersulfone / resin=40 / 60) , The average particle size is 31.78μm; 16wt% polyethylene glycol; 2wt% polyvinylpyrrolidone and 42wt% N, N dimethylacetamide.

[0038] The process of making membrane adsorbent is as follows: first add 12g resin into 21gDMAc and stir, after the dispersion is uniform, add 8gPEG and 1gPVP, add 8g PES several times after the solid is completely dissolved, to ensure that the ion exchange resin is dispersed in the polymer Evenly, after adding PES, stir the solution at 40~50℃ for 4~12 hours; after dissolving and dispersing completely, let stand and degas for 24 hours to prepare casting liquid; manually scrape the casting liquid on the glass plate to make it The flat membrane with a thickness of 0.20~0.30mm is cured and formed in a water coagulat...

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Abstract

The invention relates to a membrane adsorbent for recycling nitrogen and phosphorus resources from waste water. A doping method is adopted to uniformly distribute resin capable of selectively adsorbing nitrogen and phosphorous into a casting film solution, a wet phase separation method is adopted for preparation, the casting film solution comprises 10-30wt% of polymer, 10-35wt% of resin, 4-30wt% of additive and the balance of solvent; the membrane adsorbent comprises a flat membrane adsorbent and a hollow fiber membrane adsorbent; and the membrane adsorbent can be used for preparing magnesium ammonium phosphate as a slow release fertilizer, thus the recycling of nitrogen and phosphorus resources is realized. The invention has the advantages that: the surface of the membrane adsorbent is provided with an open pore structure, the water flux is higher, and the adsorption and desorption performances of nitrogen and phosphorous ions are good; the preparation method of the membrane adsorbent is simple, easy to implement, low in cost, environmentally-friendly, safe and reliable as well as easy for realization of large-scale application and popularization, thus the preparation method has practical industrial application significance.

Description

【Technical Field】 [0001] The invention relates to the technical field of water treatment and wastewater treatment, in particular to a membrane adsorbent for recycling nitrogen and phosphorus resources in wastewater, and a preparation method and application thereof. 【technical background】 [0002] Phosphorus is a very important resource on the earth. It is a raw material for the production of fertilizers, feeds, detergents and other necessities of people's daily life. The phosphate mineral resources on the earth are limited. The phosphate mines that have been proven to be mineable are used at the current mining rate of about 40 million t / a, and it is estimated that the duration of use will not exceed 100 years. And due to the continuous growth of the world's population, especially in areas with poor soil, the consumption of phosphate fertilizers is increasing. Therefore, phosphorus recovery is a need for sustainable social development. [0003] The struvite crystal precipitation ...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C02F1/28C02F1/44C02F1/58C05F7/00
CPCY02A40/20
Inventor 陈玉海徐进李大维李然王茗惠
Owner 天津森诺过滤技术有限公司
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