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Process for assisting in strengthening phosphorus removal and phosphorus recovery of phosphorus-containing wastewater

A waste water and process technology, applied in the direction of water pollutants, chemical instruments and methods, neutralized water/sewage treatment, etc., can solve the problems of long reaction time, high treatment cost, limited phosphorus removal efficiency, etc., to reduce conductivity, Effects of increasing crystallization efficiency, accelerating nucleation rate, and crystal growth rate

Inactive Publication Date: 2020-11-06
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the reaction characteristics of the traditional ammonium magnesium phosphate crystallization method, which must be added with chemicals, the treatment cost of this technology is too high, the reaction time is long, and the removal efficiency of phosphorus is limited.

Method used

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  • Process for assisting in strengthening phosphorus removal and phosphorus recovery of phosphorus-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 Shown, a kind of auxiliary strengthening phosphorus-containing waste water dephosphorization of the present invention and the technique of reclaiming phosphorus, concrete steps are: get waste liquid 200ml, add the magnesium chloride solution of 0.5mol / L, adjust N:Mg:P=1:1: 1; Add 1.6g of 60-mesh red mud seed crystals to it, start stirring, and the stirring speed is 150r / min; then add 0.5mol / L sodium hydroxide to adjust the pH of the solution to 9.5; adjust the constant magnetic field, and the magnetic induction intensity is 0.1T , the temperature is controlled at 60-70°C, the reaction time is 60 minutes, and it is left to stand for 30 minutes; finally, it is filtered and dried. After the reaction, the removal rate of nitrogen and phosphorus in the filtrate was detected, and the removal rate of phosphorus was 91%, and the removal rate of ammonia nitrogen was 85%.

Embodiment 2

[0028] Take 500ml of waste liquid, add 0.5mol / L magnesium chloride solution, adjust N:Mg:P=1:1.4:1; add 4g of 60-mesh red mud seed crystals to it, start stirring, and the stirring speed is 180r / min; then add 1.0mol / L sodium hydroxide, adjust the pH of the solution to 9.5; adjust the constant magnetic field, the magnetic induction intensity is 0.2T, the temperature is controlled at 70-80°C, the reaction time is 60min, and stand for 30min; finally filter and dry. After the reaction, the removal rate of nitrogen and phosphorus in the filtrate was detected, and the removal rate of phosphorus was 96.5%, and the removal rate of ammonia nitrogen was 90%.

Embodiment 3

[0030] Take 1L of waste liquid, add 1.0mol / L magnesium chloride solution, adjust N:Mg:P=1:1.8:1; add 80 mesh red mud seed crystals 8g to it, start stirring, and the stirring speed is 200r / min; then add 1.0mol / L sodium hydroxide, adjust the pH of the solution to 9.5; adjust the constant magnetic field, the magnetic induction intensity is 0.3T, the temperature is controlled at 80-90°C, the reaction time is 90min, stand still for 30min; finally filter and dry. After the reaction, the removal rate of nitrogen and phosphorus in the filtrate was detected, and the removal rate of phosphorus was 90%, and the removal rate of ammonia nitrogen was 92%.

[0031] From the concentration analysis of the wastewater treated in the above three examples, it can be seen that changing some reaction conditions will have some impact on the final result. But in general, the phosphorus removal rate is basically over 90%, the phosphorus removal rate is high, and the reaction time is short, which still ...

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Abstract

The invention discloses a process for assisting in strengthening phosphorus removal and phosphorus recovery of phosphorus-containing wastewater. The process comprises the following steps: adding a proper amount of a magnesium ion solution, precipitating phosphorus in the waste liquid in the form of magnesium ammonium phosphate crystals, adding red mud, enhancing the reaction by using a proper magnetic field, accelerating the crystallization rate of magnesium ammonium phosphate, and finally filtering and drying the obtained precipitate to obtain the final product. The process disclosed by the invention is short in reaction time, can optimize the problems of long time and incomplete treatment in the existing treatment of the phosphorus-containing waste liquid, and meanwhile, utilize the solid waste, namely the red mud, discharged from the aluminum production industry, so that the process has important economic benefits and social significance for reducing the treatment cost, solving theproblems that the waste liquid is difficult to treat and the like.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a process for assisting and strengthening the removal of phosphorus elements in phosphorus-containing wastewater and recovering phosphorus. Background technique [0002] Phosphorus is an indispensable element for living organisms. The metabolic process of organisms requires the participation of phosphorus. Phosphorus has an important strategic position in our country. As a non-renewable and irreplaceable resource, how to use phosphorus reasonably and recycle domestic sewage , Phosphorus in aquaculture wastewater, etc., is an urgent task and an important issue for the healthy development of phosphorus chemical industry in my country. High-phosphorus wastewater can easily cause eutrophication of the water body (the phosphorus content is too high, leading to the crazy growth of algae ("bloom", "red tide" and other phenomena), affecting the survival of fish an...

Claims

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Application Information

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IPC IPC(8): C02F9/12C02F101/16
CPCC02F9/00C02F1/66C02F1/48C02F1/001C02F2101/16
Inventor 郑文婕孙彩霞关乾陈阳芷曾桂生刘畅姚俊霞钟昀凌波马林娟
Owner NANCHANG HANGKONG UNIVERSITY
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