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High-concentration nitrobenzene wastewater pretreatment device and treatment method

A pretreatment device, nitrobenzene technology, applied in multi-stage water treatment, water/sewage treatment, natural water treatment, etc., can solve the problems of difficult pretreatment, high treatment cost, low treatment efficiency, etc., and achieve operating cost Low cost, good treatment effect and low operating cost

Active Publication Date: 2016-06-08
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of high pretreatment difficulty, low treatment efficiency, high treatment cost and complicated operation in existing methods for treating high-concentration nitrobenzene wastewater, the present invention provides a high-concentration nitrobenzene wastewater pretreatment device and treatment method , the pretreatment device consists of a pH adjustment tank, an integrated fully mixed zero-valent iron reaction tank, a Fenton-like reaction tank and a flocculation sedimentation tank.

Method used

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  • High-concentration nitrobenzene wastewater pretreatment device and treatment method
  • High-concentration nitrobenzene wastewater pretreatment device and treatment method

Examples

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Embodiment 1

[0038] Such as figure 1 with figure 2 As shown, a high-concentration nitrobenzene wastewater pretreatment device includes a pH adjustment tank, an integrated fully mixed zero-valent iron reaction tank, a Fenton-like reaction tank and a flocculation sedimentation tank, and an integrated fully mixed zero-valent iron reaction tank Including iron powder automatic doser 1, reaction pool 2, baffle structure 3 and full mixing mixer 4, reaction pool 2 includes settling area 5 and reaction area 6, integrated full mixing zero-valent iron reaction pool adopts mechanical stirring; settling area 5 is a diameter-expanding structure, that is, the upper diameter of the settlement zone 5 is larger than the lower diameter, and the middle is transitionally connected. The Fenton-like reaction pool is composed of 6 reaction pools, the front 2 reaction pools are mechanically stirred, and the rear 4 reaction pools are air stirred.

[0039] The above-mentioned high-concentration nitrobenzene waste...

Embodiment 2

[0045] The structure of the high-concentration nitrobenzene waste water pretreatment device in this embodiment is the same as that of Embodiment 1. The waste water treated in this embodiment is DNAN washing waste water (DNAN process produced by nitration and nitration of chlorobenzene), and the water quality is: the COD concentration is about 10000mg / L, the concentration of nitrobenzene is 1000mg / L, and the pH value is about 7.0.

[0046] 1) There is no need for pH adjustment, and the pH adjustment tank is directly pumped into the integrated fully mixed zero-valent iron reaction pool (the integrated fully mixed zero-valent iron reaction pool independently designed by Jiangsu Nanda Environmental Protection Technology Co., Ltd., the number is IFMP-ZVI- ND), the lifting flow rate is 20m 3 / h, the reaction residence time is 45min, the consumption of cast iron powder per ton of wastewater is about 0.50kg, and the initial dosage of manganese / copper composite material in the reaction...

Embodiment 3

[0051] The structure of the high-concentration nitrobenzene wastewater pretreatment device in this example is the same as in Example 1. The wastewater treated in this example is nitrotoluene production wastewater (the process is toluene mixed acid nitration), and the water quality is: COD concentration is 5000~ 7000mg / L, the concentration of nitrobenzene is 500mg / L, and the pH is 1.5-2.5.

[0052] 1) In the pH adjustment tank, use NaOH to adjust the pH of the high-concentration nitrobenzene wastewater to be treated to 3-7, and then the pump lifts it into the integrated fully mixed zero-valent iron reaction tank (using the integrated integrated zero-valent iron reaction tank independently designed by Jiangsu Nanda Environmental Protection Technology Co., Ltd. In the fully mixed zero-valent iron reaction pool, the serial number is IFMP-ZVI-ND), the pump lift flow rate is 15m 3 / h, the reaction residence time is 20min, the consumption of cast iron powder per ton of wastewater is ...

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Abstract

The invention discloses a high-concentration nitrobenzene wastewater pretreatment device and treatment method, belonging to the field of organic chemical industry wastewater treatment. The device and method solve the problems of high pretreatment difficulty, low treatment efficiency, high treatment cost, complex operation and the like in the existing high-concentration nitrobenzene wastewater treatment method. The pretreatment device is sequentially composed of a pH regulating tank, an integrated complete-mixing zero-valent iron reaction tank, a Fenton-like reaction tank and a flocculating settling tank. The integrated complete-mixing zero-valent iron reaction tank has high reduction treatment capacity for nondegradable organic matters, can not harden after long-term operation, and has the advantages of wide pH value range, low iron powder consumption, lower operating cost and simple operation. The Fenton-like reaction tank performs Fenton oxidation by utilizing Fe<2+> and H2O2 which are dissolved out by the integrated complete-mixing catalytic zero-valent iron reduction reaction, thereby lowering the pollutant concentration under economical conditions. Thus, the high-concentration nitrobenzene wastewater pretreatment method has the advantages of favorable treatment effect and lower operating cost, is simple to operate, and can stably satisfy the subsequent biochemical treatment requirements.

Description

technical field [0001] The invention belongs to the field of organic chemical wastewater treatment, and more specifically relates to a high-concentration nitrobenzene wastewater pretreatment device and a treatment method. Background technique [0002] Nitrification is a very important chemical process. The main process is to use nitric acid as a nitrating agent and sulfuric acid as a catalyst to react with aromatic hydrocarbons to generate nitroaromatics. Common nitroaromatics include nitrobenzene, nitrotoluene, trinitro Toluene and nitrochlorobenzene, etc., are important chemical raw materials and are widely used in industries such as military industry, medicine, dyestuffs and polyurethane materials. [0003] During the production process of nitrification series products, a high-concentration wastewater with high chroma, complex composition, high toxicity and poor biodegradability is produced, which contains a large amount of organic poisons such as nitrobenzene, which is d...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/5281C02F1/56C02F1/66C02F1/705C02F1/722C02F9/00C02F2101/38C02F2103/36C02F2301/08C02F2305/026
Inventor 周宗远夏晨娇吕路张炜铭
Owner NANJING UNIV
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