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Nanometer zero-valent iron filler, preparation method thereof and application of nanometer zero-valent iron filler in denitrification nitrogen removal

A nano-zero-valent iron and ferrous ion technology, applied in the field of environmental pollution control, can solve the problems of nano-zero-valent iron agglomeration and oxidation, complex preparation or modification process, and difficulty in fully functioning, etc. Excellent, good load effect

Pending Publication Date: 2021-11-19
ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nano zero-valent iron is prone to agglomeration and oxidation during preparation, storage and use, which reduces the electron transfer efficiency between it and pollutants, making it difficult to fully play its role.
Surface chemical modification, doping inert elements (N,

Method used

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  • Nanometer zero-valent iron filler, preparation method thereof and application of nanometer zero-valent iron filler in denitrification nitrogen removal
  • Nanometer zero-valent iron filler, preparation method thereof and application of nanometer zero-valent iron filler in denitrification nitrogen removal
  • Nanometer zero-valent iron filler, preparation method thereof and application of nanometer zero-valent iron filler in denitrification nitrogen removal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: the preparation of nanometer zero valent iron filler

[0041] Pretreatment of polyethylene filler: select an appropriate amount of polyethylene filler and put it in 300-500g / L NaOH solution, assuming that the polyethylene filler is completely submerged in NaOH, take it out after soaking for 24-72 hours, and rinse it with deionized water to the rinse solution Until it becomes neutral, take it out and dry it at 80°C.

[0042] Put an appropriate amount of polyethylene filler into ferrous sulfate solution with a concentration of ferrous ion of 1-5g / L, the mass ratio of polyethylene filler to ferrous ion is 20:1, mix well, soak for 30-60min after immersion, The temperature is 50°C; add an appropriate amount of tea polyphenol solution with a concentration of 1-10g / L, so that the mass ratio of ferrous ions to tea polyphenols is 0.2-0.8:1, mix well and immerse for 1-5 days , the temperature was 50°C; then the filler was taken out, rinsed with deionized water, and...

Embodiment 2

[0052] Example 2: Application comparison of nanometer zero-valent iron filler in denitrification and denitrification of sewage biological treatment

[0053] Taking simulated domestic sewage as the treatment object, the nanometer zero-valent iron fillers of Example 1, Comparative Examples 1 and 2 were respectively added to the O pool (aerobic pool) of the A / O-MBR reactor. Among them, the loading capacity of nano-zero-valent iron on the nano-zero-valent iron filler in Example 1 is 2 to 5 mg / g, the filler is flake-shaped, and the specific surface area is 57.89 cm 2 / g, the specific gravity is 0.95kg / L, the diameter is 30mm, and the thickness is 1.1mm. The concentrations of COD, ammonia nitrogen, total nitrogen and total phosphorus in simulated domestic sewage were 350±20, 25±2, 38±2 and 2.7±0.2 mg / L, respectively. The effective volume of both anoxic pool and aerobic pool is 4.5L. The membrane module is a polyvinylidene fluoride microfiltration membrane, purchased from Shanghai ...

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Abstract

The invention relates to a nano zero-valent iron filler, a preparation method thereof and application of the nano zero-valent iron filler in denitrification nitrogen removal, and belongs to the technical field of environmental pollution treatment. The invention discloses a preparation method of a nano zero-valent iron filler. The preparation method comprises the following steps: selecting a proper amount of polyethylene filler, putting the polyethylene filler into a 300-500g/L NaOH solution, taking out the polyethylene filler after the polyethylene filler is completely immersed in NaOH for 24-72 hours, washing the polyethylene filler with deionized water until the washing liquid is neutral, taking out the polyethylene filler, and drying the polyethylene filler at 60-90 DEG C; putting the pretreated polyethylene filler into a ferrous sulfate solution, uniformly mixing and soaking; adding a tea polyphenol solution, uniformly mixing and soaking; and taking out the filler, washing with deionized water, and drying to obtain the nano zero-valent iron filler. Simulated domestic sewage is taken as a treatment object, the nano zero-valent iron filler is added into the aerobic tank of an A/O/-MBR reactor, after operation is performed for 130 days, the concentration of nitrate nitrogen in effluent is 5.8-8.9 mg/L, the total nitrogen removal rate reaches 73.5%-82.4%, the process is friendly, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to a nanometer zero-valent iron filler, a preparation method thereof and an application in denitrification and denitrification, and belongs to the technical field of environmental pollution control. Background technique [0002] In recent years, with the improvement of people's living standards in our country and the gradual advancement of ecological civilization construction, urban sewage discharge standards have become increasingly stringent, and nitrogen exceeding the standard has become one of the important restrictive factors for achieving municipal sewage discharge standards. Usually, the traditional sewage biological denitrification process includes two steps. First, the ammonia nitrogen in the sewage is converted into nitrate nitrogen through nitrification under aerobic conditions, and then the nitrate nitrogen is converted into nitrate nitrogen through denitrification under anoxic conditions. Nitrogen for denitrification....

Claims

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Application Information

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IPC IPC(8): B22F9/24B22F1/00B82Y30/00B82Y40/00C02F3/10C02F3/28C02F3/12C02F101/16
CPCB22F9/24B82Y30/00B82Y40/00C02F3/107C02F3/105C02F3/28C02F3/1268C02F2101/16Y02W10/10
Inventor 李秀芬郑展望陈坚潘碧文堵国成徐涛李江华
Owner ZHEJIANG SHUANGLIANG SUNDA ENVIRONMENTAL PROTECTION CO LTD