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Method for extracting phosphorus from phosphorus-containing wastewater

A technology of waste water and recovery agent, which is applied in the field of phosphorus extraction, can solve the problems of phosphorus resource loss, etc., and achieve the effect of pure white color and good extraction effect

Pending Publication Date: 2021-10-22
大连波美科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of low-concentration phosphorus-containing wastewater is discharged, resulting in a huge loss of phosphorus resources

Method used

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  • Method for extracting phosphorus from phosphorus-containing wastewater
  • Method for extracting phosphorus from phosphorus-containing wastewater
  • Method for extracting phosphorus from phosphorus-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 Shown is a flowchart of an embodiment of the present invention. The source of waste water 1 is the waste water produced by the acidification of plant saponins with sulfuric acid, the hardness of waste water 1 is 9000 mg / L, and the phosphate is 5000 mg / L. The recovery agent is Ca(OH) 2 , Filtration device 4 for filtering I uses a candle filter with a filtration precision of 1 μm.

[0036] The specific implementation method is: add recovering agent 2 to waste water 1, adjust the pH value of waste water to 7.2, enter the reaction tank 3 for contact reaction for 30 minutes, and the turbid liquid after the contact reaction enters the filter device 4 of filtration I for solid-liquid separation, and obtains The main component is CaHPO 4 , MgHPO 4 The recycled material 6, and the separation liquid 5. The moisture content of recycled material 6 is 30%, which can be used directly or after being dried. The separation liquid 5 can be reused or discharged afte...

Embodiment 2

[0039] Such as figure 2 Shown is the flow chart of the second embodiment of the present invention. The source of waste water 1 is the waste water produced by the acidification of plant saponins with sulfuric acid, the hardness of waste water 1 is 9000 mg / L, and the phosphate is 5000 mg / L. The recovery agent is Ca(OH) 2, the filtering device 4 for filtering I and the filtering device A for filtering II adopt a candle filter with a filtering precision of 1 μm.

[0040] The specific implementation method is: firstly, the waste water 1 passes through the filter device A of the filter II to remove suspended solids and grease in the water; then, the recovery agent 2 is added to the produced water of the filter device A of the filter II, and the pH value of the wastewater is adjusted to 7.2, and then enters the reaction tank 3 The turbid liquid after the contact reaction enters the filter device 4 of Filtration I for solid-liquid separation, and the main component is CaHPO 4 , Mg...

Embodiment 3

[0043] like image 3 Shown is the flowchart of the third embodiment of the present invention. The source of waste water 1 is the waste water produced by the acidification of plant saponins with sulfuric acid, the hardness of waste water 1 is 9000 mg / L, and the phosphate is 5000 mg / L. The recovering agent A is Ca(OH) 2 , what filter device 4 adopts is the candle type filter that filter accuracy is 1 μm.

[0044] The specific implementation method is as follows: Wastewater 1 first passes through the filter device A of Filtration II to remove suspended solids and grease in the water; then enters the concentration device B to concentrate the phosphate in the water to the concentrated water side of the concentration device B; Desalted water can be treated by other processes. Add recovering agent 2 to the concentrated water of concentration device B, adjust the pH value of the wastewater to 7.2, enter the reaction tank 3 for a contact reaction for 30 minutes, and the turbid liqui...

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Abstract

The invention provides a method for extracting phosphorus from phosphorus-containing wastewater, and particularly relates to a method for extracting phosphorus from wastewater obtained by acidifying vegetable oil gleditsia sinensis lam with sulfuric acid. The method comprises the following steps of: performing contact reaction on wastewater obtained by acidifying vegetable oil gleditsia sinensis lam with sulfuric acid and a recycling agent A; and then carrying out solid-liquid separation through a filtering device to obtain a pure white or grey white solid mainly containing calcium hydrophosphate. The water content of the obtained phosphorus-containing solid is 30%-40%, and the solid can be dried or naturally air-dried to obtain a dried solid. The phosphorus-containing solid can be used as a phosphate fertilizer and also can be used as an additive of animal feed. The invention also provides a process for extracting phosphorus from vegetable oil saponin wastewater. The process comprises a filtering unit, a concentrating unit and a phosphorus extracting unit.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment, in particular to a method for extracting phosphorus from waste water. Background technique [0002] As one of the three elements of fertilizer, phosphorus is one of the 17 elements necessary for living organisms. Together with nitrogen and potassium, it is called the "three major nutritional elements" of plants and is one of the indispensable and important nutritional elements for living organisms. , is of great significance to the survival and development of human beings. [0003] Feed calcium hydrogen phosphate is an important component of the feed industry. A certain proportion of feed calcium hydrogen phosphate is mixed in the feed. The phosphorus in it is an important element for the metabolism and maintenance of physiological functions in the animal body. It is known as the "vital element". Calcium is an important component of bones and teeth. It can promote blood circulatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/34C01B25/32C05B21/00A23K20/26C02F9/04
CPCC01B25/34C01B25/32C05B1/04A23K20/26C02F1/5236C02F1/001C05B9/00
Inventor 韩国美毛治强孙杰
Owner 大连波美科技有限公司
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