Chemical for removing nitrogen and/or phosphorus and preparation thereof, and application of chemical to adsorption of wastewater and co-production of slow-release fertilizer

A technology for medicaments and wastewater, applied in application, fertilizer mixture, water/sewage treatment, etc., can solve the problems of frequent regeneration, affecting the use effect, and no secondary pollution, so as to achieve high utilization rate of resources, improve treatment effect, and prepare The effect of simple method

Active Publication Date: 2019-10-29
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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  • Chemical for removing nitrogen and/or phosphorus and preparation thereof, and application of chemical to adsorption of wastewater and co-production of slow-release fertilizer
  • Chemical for removing nitrogen and/or phosphorus and preparation thereof, and application of chemical to adsorption of wastewater and co-production of slow-release fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1) Mix ferrous sulfate and glass pumice according to the mass ratio of 1:25, place them in a ball mill, and grind for 4 hours before 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 P / N ratio 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 minutes; centrifuge to discard the supernatant, and the solid product is washed Afterwards, it is vacuum-dried to obtain the denitrification and dephosphorization agent.

[0052] 4) Add nitrogen and phosphorus removal agent to the experimental water sample (TP 2.5mg / L, NH 3 -N 35mg / L), adjust the pH to 8, stir and precipitate for 0.5h, the measured TP content i...

Embodiment 2

[0067] 1) Mix ferrous sulfate and glass pumice according to a mass ratio of 1:10, place them in a ball mill, and grind for 4 hours before 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 P / N ratio is 1:1 with 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 minutes; centrifuge to discard the supernatant, and the solid product is washed Afterwards, it is vacuum-dried to obtain the 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, stir and precipitate for 0.5h, the measured TP ...

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Abstract

The invention specifically discloses a chemical for removing nitrogen and/or phosphorus and a preparation method thereof, belonging to the technical field of wastewater treatment. The preparation method comprises the following steps: mixing a ferrous source, a raw material A and glass pumice, adjusting the pH value of a formed system to no less than 8, and carrying out a reaction to obtain the chemical, wherein the material A is a material which can react with nitrogen and/or phosphorus in to-be-treated wastewater to produce a magnesium ammonium phosphate precipitate. The invention also discloses the chemical prepared by using the preparation method and the application of the chemical in the treatment of wastewater and the co-production of a slow-release fertilizer. According to the invention, the glass pumice has dense through-type micro-pores inside, especially has the application functions of storage and sustained release of fertilizers, water absorption and water retention, and canbe combined with other substances for effective physical and chemical absorption of nitrogen and phosphorus in a water body. The chemical has good stability, wide application range, small dosage andlow sludge output and can be used as the slow-release fertilizer. The chemical is an environmentally friendly agent with good application prospects.

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 rivers, lakes, oceans and other water environments, which has led to eutrophication of water bodies and even black and odorous water bodies. Among them, phosphorus pollution is 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 body with the drainage of the farmland. In addition, the waste produced in the process of livestock and poultry breeding also contains a considerable amount of nitrogen and phosphorus nutrients, which may enter adjacent wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28B01J20/10B01J20/30C05G3/00C02F101/16
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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