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Method and device for supergravity on-line preparation of nano zero-valent iron and synchronous treatment on nitrobenzene wastewater

A technology of nitrobenzene wastewater and nano-zero-valent iron, applied in nanotechnology, nanotechnology, water/sewage treatment, etc., can solve the problems of easy aggregation of nanoparticles, complicated preparation process, easy oxidation and deactivation, etc., and achieve rapid mixing Uniform, low cost, simple process effect

Active Publication Date: 2016-08-17
ZHONGBEI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] Aiming at the current problems such as the complicated preparation process of nano-zero-valent iron, harsh conditions, difficulty in scaling up, easy aggregation of nanoparticles and easy oxidation and deactivation during drying, storage and use, the present invention aims to provide a fast, efficient, continuous and convenient Device and method for engineering scaled-up high-gravity online preparation of nano-zero-valent iron and simultaneous treatment of nitrobenzene wastewater

Method used

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  • Method and device for supergravity on-line preparation of nano zero-valent iron and synchronous treatment on nitrobenzene wastewater
  • Method and device for supergravity on-line preparation of nano zero-valent iron and synchronous treatment on nitrobenzene wastewater
  • Method and device for supergravity on-line preparation of nano zero-valent iron and synchronous treatment on nitrobenzene wastewater

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Experimental program
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Effect test

Embodiment 1

[0032] use figure 1 The process flow shown, the initial concentration of 250 mg L was treated at 20 °C -1 of nitrobenzene wastewater. Ferrous sulfate (FeSO 4 ·7H 2 O) The nitrobenzene wastewater dissolved in the liquid storage tank Ⅰ1 is formulated to contain FeSO 4 Nitrobenzene wastewater solution, FeSO 4 The concentration is 25 times the concentration of nitrobenzene, adjust the initial pH to 3.0; prepare NaBH with tap water 4 solution and placed in storage tank Ⅱ5, NaBH 4 The concentration is the FeSO 4 3 times the concentration. The two streams of liquid are respectively measured by the pumps I and II through the liquid flowmeters I and II, and then sprayed out from the feed pipes I and II10 nozzles I and II, at a rate of 15 m s -1The initial collision, mixing and reaction are carried out in the collision region 18 at the collision initial velocity. Subsequently, the liquid enters the packing rotor with a rotation speed of 500 rpm from the inside to the outside al...

Embodiment 2

[0035] use figure 1 The process flow shown, the initial concentration of 100 mg L was treated at 10 ℃ -1 of nitrobenzene wastewater. Ferrous chloride (FeCl 2 ) dissolved in the nitrobenzene wastewater in the liquid storage tank Ⅰ1, made into FeCl-containing 2 Nitrobenzene wastewater solution, FeCl 2 The concentration is 20 times the concentration of nitrobenzene, adjust the initial pH to 7.0; prepare NaBH with tap water 4 solution and placed in storage tank Ⅱ5, NaBH 4 The concentration is the FeCl 2 2.5 times the concentration. Impinging flow - the rotational speed of the rotating packed bed is 2000 rpm, and the initial impacting velocity is 25 m s -1 . The treated nitrobenzene wastewater is discharged into the liquid storage tank 17 from the liquid outlet, and the sampling analysis shows that the removal rate of nitrobenzene is 98%. Sampling and analysis after standing for 3 minutes showed that the removal rate of nitrobenzene was 100%, and all of them were converted...

Embodiment 3

[0038] use figure 1 As shown in the process flow, the initial concentration of 500 mg L was treated at 25 °C -1 of nitrobenzene wastewater. FeSO 4 ·7H 2 O dissolved in the nitrobenzene wastewater in the liquid storage tank Ⅰ1, made into FeSO 4 Nitrobenzene wastewater solution, FeSO 4 The concentration is 25 times the concentration of nitrobenzene, adjust the initial pH to 3.0; prepare KBH with tap water 4 solution and placed in reservoir II5, KBH 4 The concentration is the FeSO 4 4 times the concentration. Impinging flow - the rotational speed of the rotating packed bed is 800 rpm, and the initial impacting velocity is 5 m s -1 . The treated nitrobenzene wastewater was discharged from the liquid outlet into the liquid storage tank 17 for sampling and analysis, and the removal rate of nitrobenzene was 92%. After standing for 3 minutes, the removal rate of nitrobenzene was 97%.

[0039] This method uses supergravity technology to realize online preparation of nanometer...

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Abstract

The invention belongs to the technical field of preparation of nano materials and nitrobenzene wastewater treatment, particularly relates to a method and a device for supergravity on-line preparation of nano zero-valent iron and synchronous treatment on nitrobenzene wastewater, and aims to solve the problems that conventional nano zero-valent iron is complex in preparation process, conditions are rigorous, the preparation process is not easy to amplify, nanoparticles are easy to agglomerate, oxidize and deactivate in the processes of drying, storage and use, and the like. The method comprises the following steps: enabling a ferrous salt containing nitrobenzene wastewater solution and a KBH4 or NaBH4 aqueous solution to react in an impinging stream device for collision, feeding into a rotating packed bed for mixing and reacting, and implementing preparation of nano zero-valent iron and treatment on the nitrobenzene wastewater by using the nano zero-valent iron simultaneously. The method and the device have the advantages that the situation that the nano zero-valent iron can be reacted with nitrobenzene only after being completely developed into large particles in a conventional method is avoided, the nano zero-valent iron can be relatively sufficiently utilized, the amount can be remarkably reduced, multiple steps of reaction is reduced to one step, the reaction can be implemented rapidly, the retention time is shortened, continuous operation can be achieved, and the method and the device are applicable to nitrobenzene wastewater treatment which is large in treatment volume and heavy in treatment task.

Description

technical field [0001] The invention belongs to the technical field of preparation of nanometer materials and treatment of nitrobenzene wastewater, and in particular relates to a method and device for preparing nanometer zero-valent iron on-line under high gravity and synchronously treating nitrobenzene wastewater. Background technique [0002] Nanoscaled Zerovalent Iron (NZVI) has the characteristics of large specific surface area and high reactivity. It has great application potential in wastewater treatment fields such as the removal of heavy metal ions, the degradation of organic wastewater, and the remediation of groundwater pollution. Studies have shown that nano-zero-valent iron can quickly and efficiently reduce refractory nitrobenzene compounds to easily biodegradable aniline compounds. However, the preparation cost of nano-zero-valent iron is high, the activity of nanoparticles is high, and there are problems such as easy agglomeration and deactivation of particles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70B22F9/24B82B3/00C02F101/38
CPCB22F9/24B82B3/0004C02F1/705C02F2101/38
Inventor 刘有智焦纬洲袁志国张巧玲高璟罗莹申红艳栗秀萍祁贵生俸志荣
Owner ZHONGBEI UNIV
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