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Method for reclaiming nitrogen and phosphorus in nitrogen and phosphorus-containing wastewater by using bittern as magnesium source

A technology of nitrogen, phosphorus and brine, which is applied in the field of treatment and utilization of wastewater rich in nitrogen and phosphorus, and can solve the problems of high price and restrictions on the popularization and application of struvite precipitation method

Inactive Publication Date: 2011-06-15
INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high price of these precipitants, the popularization and application of the struvite precipitation method is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 8.5, fully stir, then add the brine that is 0.5% by volume, drop Add NaOH solution, control the reaction pH value to 8.5 and the reaction time for 30 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25 ° C. The recovery rate of phosphorus is 98% and the recovery rate of nitrogen is 30%. %.

Embodiment 2

[0012] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 9.5, fully stir, then add the brine that is 0.5% by volume, drop Add NaOH solution, control the reaction pH value to 9.5 and the reaction time for 30 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25°C. After testing, the recovery rate of phosphorus is 99%, and the recovery rate of nitrogen is 30%. %.

Embodiment 3

[0014] Take NH 4 + 、PO 4 3- , Mg 2+ and Ca 2+ Concentrations are 200mg / L, 120mg / L, 60mg / L and 50mg / L respectively, and the initial pH value is 7 livestock and poultry breeding wastewater, adjust the pH value to 9.5, fully stir, then add the brine with a volume ratio of 1%, drop Add NaOH solution, control the reaction pH value to 9.5 and the reaction time for 40 minutes, let it stand for 60 minutes, pour off the supernatant, and then dry the precipitate at a constant temperature at 25 ° C. After testing, the recovery rate of phosphorus is 99%, and the recovery rate of nitrogen is 30%. %.

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PUM

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Abstract

The invention discloses a method for reclaiming nitrogen and phosphorus in nitrogen and phosphorus-containing wastewater by using bittern as a magnesium source, and belongs to the technical field of environmental engineering water treatment. The method comprises the following steps of: regulating the initial pH value of the nitrogen and phosphorus-containing wastewater, fully stirring the wastewater, adding a certain amount of bittern, controlling the reaction time and the reaction pH value, then standing, performing solid-liquid separation, and reclaiming struvite sediment. Compared with the prior art, the waste can be treated by using the other waste, the wastewater treatment cost is saved, the struvite serving as a reaction product can be used as a fertilizer, and the method lays a foundation for practical application and can fulfill the purpose of recycling the resources.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering water treatment, and relates to a method for treating and utilizing waste water rich in nitrogen and phosphorus. Background technique [0002] The existence of a large amount of nitrogen and phosphorus in wastewater is one of the main reasons for water eutrophication, which has a serious negative impact on the quality of water environment and has become one of the major environmental problems at present. The removal methods of nitrogen and phosphorus in wastewater mainly include biological methods and physical and chemical methods. The biological method has the characteristics of low operating cost and easy operation and management, but the biological method is more suitable for treating low-concentration nitrogen and phosphorus wastewater. High-concentration nitrogen and phosphorus wastewater often inhibits biochemical reactions, while physical and chemical methods treat high-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/45C02F1/66
Inventor 叶志隆陈少华石建稳王淑梅芦敏
Owner INST OF URBAN ENVIRONMENT CHINESE ACAD OF SCI
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