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A medicament for denitrification and/or phosphorus and its preparation and application in wastewater adsorption and co-production of slow-release fertilizers

A wastewater and chemical technology, applied in sewage/sludge fertilizers, applications, organic fertilizers, etc., can solve the problems of frequent regeneration, no secondary pollution, high price, etc., and achieve high resource utilization, simple preparation method, and use The effect of the convenience of the process

Active Publication Date: 2022-05-27
长沙工研院环保有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption material modified with rare earth elements has high phosphorus removal efficiency, but it has the disadvantage of being expensive
Generally speaking, the adsorption phosphorus removal agent may have the disadvantages of low selectivity of the adsorbent, small adsorption capacity, frequent regeneration, and no secondary pollution.
[0005] Because there are certain defects in various phosphorus removal technologies, the single function of phosphorus removal agents also affects its use effect

Method used

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  • A medicament for denitrification and/or phosphorus and its preparation and application in wastewater adsorption and co-production of slow-release fertilizers
  • A medicament for denitrification and/or phosphorus and its preparation and application in wastewater adsorption and co-production of slow-release fertilizers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) After mixing ferrous sulfate and glass pumice in a mass ratio of 1:25, place them in a ball mill, and grind them for 4h for later use;

[0050] 2) The concentration of ammonia nitrogen in the wastewater is 35mg / L, the concentration of TP is 3.5mg / L, the wastewater in the experiment is 1000mL, and the ratio of P / N is 1:1 with 0.15g / LNaH 2 PO 4 Dosing, the ratio of Mg / N substance is 1:1, with 0.15g / L MgCl 2 Mix the two for use;

[0051] 3) Mix the mixture of step 1) and step 2) at a ratio of 15:1, add ammonia water dropwise under ultrasonic conditions at 55°C to make the pH of the solution 8.5, and react for 40 min; centrifuge to discard the supernatant, and the solid product is washed Then, vacuum drying to obtain denitrification and dephosphorization agent.

[0052] 4) The nitrogen and phosphorus removal agent was added to the experimental water sample (TP 2.5 mg / L, NH 3 -N 35mg / L), adjust pH to 8, after stirring and precipitation for 0.5h, the measured TP conten...

Embodiment 2

[0067] 1) Mix ferrous sulfate and glass pumice in a mass ratio of 1:10 and place them in a ball mill, and grind for 4 hours for later use;

[0068] 2) The concentration of ammonia nitrogen in the wastewater is 1500mg / L, the concentration of TP is 5mg / L, the wastewater in the experiment is 1000mL, and the ratio of P / N is 1:1 to 6.5g / LNaH 2 PO 4 Dosing, the ratio of Mg / N substance is 0.8:1, with 4.0g / L MgCl 2 Mix the two for use;

[0069] 3) Mix the mixture of step 1) and step 2) at a ratio of 15:1, add ammonia water dropwise under ultrasonic conditions at 55°C to make the pH of the solution 8.5, and react for 40 min; centrifuge to discard the supernatant, and the solid product is washed Then, vacuum drying to obtain denitrification and dephosphorization agent.

[0070] 4) Add the denitrification and phosphorus removal agent to the experimental water sample (TP 5mg / L, NH 3 -N 1500mg / L), adjust the pH to 8, after stirring and precipitation for 0.5h, the measured TP content is...

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Abstract

The invention belongs to the field of waste water treatment, and specifically discloses a method for preparing a medicament for denitrification and / or phosphorus, mixing a ferrous source, raw material A and glass pumice, adjusting the pH of the system to be greater than or equal to 8, and reacting to obtain the obtained The above-mentioned medicament; raw material A is a material that can react with nitrogen and / or phosphorus in the wastewater to be treated to form a magnesium ammonium phosphate precipitate. The invention also discloses the medicament prepared by the preparation method and the application of the medicament in waste water treatment and slow-release fertilizer joint production. In the present invention, the glass pumice has dense through-type fine pores inside, especially has the applicative functions of fertilizer storage, slow release, water absorption and water retention, and can effectively physically and chemically adsorb nitrogen and phosphorus in water bodies when combined with other substances . The agent has good stability, wide application range, small dosage, less sludge generation and can be used as a slow-release fertilizer. It is an environment-friendly medicament and has a good application prospect.

Description

technical field [0001] The invention relates to a sewage treatment agent, in particular to a multifunctional agent for removing phosphorus and nitrogen in a water system, and belongs to the field of sewage treatment. Background technique [0002] In recent years, with the development of my country's economy, a large amount of sewage rich in nitrogen and phosphorus has been discharged into the water environment such as rivers, lakes, and oceans, which has led to eutrophication of water bodies, and even black and odorous water bodies. a key factor. Due to the use of agricultural nitrogen and phosphorus fertilizers, a considerable amount of nutrients are accumulated in the soil, and they can flow into the adjacent surface water bodies with the drainage of the farmland. In addition, the waste produced by livestock and poultry breeding also contains a considerable amount of nitrogen and phosphorus nutrients, which may enter into adjacent water bodies through drainage; industriall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28B01J20/10B01J20/30C05G3/40C05F7/00C02F101/16
CPCC02F1/281B01J20/10B01J20/0229B01J20/02C05G3/00C02F2101/16Y02A40/20
Inventor 刘君邱敬贤梁凤仪熊燕娜
Owner 长沙工研院环保有限公司
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