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Method for removing and recovering phosphorus in pharmaceutical wastewater by homogeneous Fenton-iron phosphorus precipitation enhanced flocculation method

A technology of pharmaceutical wastewater and flocculation, which is applied in the fields of flocculation/sedimentation water/sewage treatment, chemical instruments and methods, special compound water treatment, etc. To achieve the effect of realizing sustainable recycling, improving separation and sedimentation efficiency, and increasing effective collision frequency

Pending Publication Date: 2020-07-31
CHINA PHARM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the photocatalytic oxidation treatment of organophosphorus has the characteristics of catalytic degradation by utilizing solar energy, strong oxidation ability, and no secondary pollution, the method has low photocatalytic quantum efficiency, low utilization rate of solar energy, high energy consumption, and easy deactivation of the catalyst. There are not many industrial applications
The ozone oxidation method has strong oxidation ability, mild reaction conditions, and no secondary pollution, but the ozone generation equipment is complicated, the ozone yield and utilization rate are low, and the treatment cost is high. It is economical to treat pollutants with a large amount of water.
The Fenton oxidation method has mild reaction conditions, simple equipment and operation, mature technology, and is suitable for the treatment of refractory pollutants. It has been successfully used in the treatment of various industrial wastewater, but its disadvantage is that the effluent of the Fenton oxidation method contains iron ions , may produce a large amount of iron-containing sludge
Although the above oxidation methods can efficiently oxidize and decompose organic phosphorus in pharmaceutical wastewater, they cannot effectively collect and recover phosphorus-containing products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 100 mL of 300 mg / L fosfomycin sodium solution to a 250 mL Erlenmeyer flask to adjust the pH to 4; 1 mL of iron solution and 0.2 mL of 30% hydrogen peroxide solution were sealed with parafilm and placed in a constant temperature water bath shaker for 12 hours at 60°C and 120 rad / min. After the reaction, the collected reaction solution was reacted with ferric chloride hexahydrate solution, 2.5 g of quartz sand (300 mesh) was added to the reaction system, the pH of the reaction solution was adjusted to 5, and 31.25 mL of hexahydrate was added to 250 mL of the collected reaction solution. Hydrate ferric chloride solution, make the molar ratio of iron and phosphorus in the system about 1.5:1, control the pH of the system to be stable at 5, and react for 1 h in the presence of aeration conditions (aeration rate: 2 L / min). Set at 11 h.

[0029] Results: The conversion rate of organic phosphorus reached 89%, and a stable and high phosphorus removal rate was obtained. The r...

Embodiment 2

[0031] Add 100 mL of 300 mg / L fosfomycin sodium solution to a 250 mL Erlenmeyer flask to adjust the pH to 4; add 15 mg / L (calculated as iron) ferrous chloride tetrahydrate to the Erlenmeyer flask in turn 1 mL of solution and 0.2 mL of 30% hydrogen peroxide solution were sealed with a parafilm and placed in a constant temperature water bath shaker for 12 hours at 60°C and 120 rad / min. After the reaction is over, collect the reaction liquid to react with ferric chloride hexahydrate solution, and run continuously for 40 cycles. Only add 2.5 g of quartz sand (300 mesh) to the reaction system at the beginning of the first cycle. To: adjust the pH of the reaction solution to 4, add 31.25 mL of ferric chloride hexahydrate solution to 250 mL of the collected reaction solution, make the molar ratio of iron and phosphorus in the system about 1.5:1, control the pH of the system to be stable at 4, and Conditions (aeration rate of 2 L / min) existed for 1 h, and stood still for 11 h after th...

Embodiment 3

[0034]Add 100 mL of 300 mg / L fosfomycin sodium solution to a 250 mL Erlenmeyer flask to adjust the pH to 4; add 15 mg / L (calculated as iron) ferrous chloride tetrahydrate to the Erlenmeyer flask in turn 1 mL of solution and 0.2 mL of 30% hydrogen peroxide solution were sealed with a parafilm and placed in a constant temperature water bath shaker for 12 hours at 60°C and 120 rad / min. After the reaction is over, collect the reaction liquid to react with ferric chloride hexahydrate solution, and run continuously for 60 cycles. Only add 2.5 g of quartz sand (300 mesh) to the reaction system at the beginning of the first cycle. To: adjust the pH of the reaction solution to 4, add 31.25 mL of ferric chloride hexahydrate solution to 250 mL of the collected reaction solution, make the molar ratio of iron and phosphorus in the system about 1.5:1, control the pH of the system to be stable at 4, and Conditions (aeration rate of 2 L / min) existed for 1 h, and stood still for 11 h after the...

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Abstract

The invention discloses a method for removing and recycling organophosphorus in pharmaceutical wastewater by using a homogeneous Fenton-iron phosphorus chemical precipitation coupled enhanced flocculation method, and belongs to the technical field of sewage treatment and recycling. According to the method, organophosphorus in the pharmaceutical wastewater is converted into inorganic phosphorus through a homogeneous Fenton reaction; a proper amount of a ferric salt solution is added into the obtained inorganic phosphorus solution; under the action of aeration mixing, ferric phosphate is generated through direct reaction of ferric salt and inorganic phosphorus and hydrolysis of ferric salt occurs to achieve indirect phosphorus removal effect, thus removing and recovering phosphorus. After the reaction is finished, filtration and separation are performed to obtain a phosphorus-containing product, thereby achieving the goal of recovering phosphorus in the pharmaceutical wastewater. The method is simple and convenient to operate, high in organophosphorus removal efficiency and high in separation and sedimentation efficiency, can realize multi-period continuous treatment, can keep a stable phosphorus removal rate in the multi-period treatment process, and realizes sustainable cyclic utilization of phosphorus resources.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment and resource utilization, and in particular relates to a method for removing and recovering organic phosphorus in pharmaceutical wastewater by using a homogeneous Fenton-iron phosphorus chemical precipitation coupled enhanced flocculation method. Background technique [0002] With the development of the pharmaceutical industry, there are often a large amount of organic phosphorus waste in some pharmaceutical wastewater. Organophosphorus waste is highly toxic and difficult to biodegrade. Therefore, if pharmaceutical wastewater is discharged directly into the water body without treatment, it will be extremely harmful. This will not only affect the normal growth and metabolism of microorganisms in the water body, but also have certain harm to aquatic organisms. hazards, leading to water pollution. In addition, phosphorus is one of the important elements in nature and an essential element fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/34C02F101/30
CPCC02F9/00C02F2103/343C02F1/66C02F1/722C02F1/725C02F2101/30C02F2305/026C02F1/58C02F1/52C02F7/00C02F1/28
Inventor 史静邢超商景阁汪晟
Owner CHINA PHARM UNIV
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