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Pretreatment method of m-dinitrobenzene production wastewater

A technology for m-dinitrobenzene and waste water production, which is applied in water/sewage treatment, natural water treatment, neutralized water/sewage treatment, etc., can solve the problem of poor biodegradability and unsatisfactory treatment effect of nitrobenzene compound waste water And other issues

Inactive Publication Date: 2015-02-18
SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are many treatment methods for nitro-compounds at home and abroad. Due to the poor biodegradability of nitro-benzene compound wastewater, the treatment effect is not very satisfactory.

Method used

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  • Pretreatment method of m-dinitrobenzene production wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] After filtering the m-dinitrobenzene production wastewater grid, the wastewater is adjusted to pH 3-3.5 with hydrochloric acid, and then the wastewater is continuously added from the water inlet at the lower end of the micro-electrolysis reactor with a constant flow pump, and then 10g / L of weight is added The iron-carbon mixture with a ratio of 2:3, after reacting in the reactor for 60 minutes, adjust the pH of the effluent from the outlet at the upper end of the reactor to 8-9 with lime, and the supernatant water that is precipitated and discharged is the pretreated wastewater, which is used for subsequent Biochemical treatment provides favorable conditions.

Embodiment 2

[0015] Embodiment two: processing effect

[0016] Using the pretreatment method of m-dinitrobenzene production wastewater of the present invention, the m-dinitrobenzene production wastewater of a certain chemical plant is pretreated, and the pretreatment effect is as shown in Table-1.

[0017] Table-1 Preprocessing effect

[0018]

[0019] It can be seen from Table-1 that the COD removal rate of pretreated wastewater is about 30%, the chroma removal rate is about 90%, the removal rate of nitrobenzene compounds is about 71%, and the aniline compounds increase by more than 100%. The biodegradability is greatly improved, which provides favorable conditions for the subsequent biochemical treatment.

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Abstract

The invention relates to a pretreatment method of m-dinitrobenzene production wastewater, and belongs to the field of wastewater treatment methods. The pretreatment method comprises the following steps: filtering the m-dinitrobenzene production wastewater by grids, adjusting the pH values of the wastewater by hydrochloric acid, continuously adding the wastewater into a water inlet in the lower end of a microelectrolytic reactor by a constant-flow pump, adding a certain amount of iron-carbon mixture for reacting in the reactor for a certain time, adjusting the pH value of outlet water at a water outlet in the upper end of the reactor to be 8-9 by lime, settling, and discharging supernatant liquid, namely the pretreated wastewater, thereby providing favorable conditions for subsequent biochemical treatment. According to the pretreatment method, the m-dinitrobenzene production wastewater is pretreated by a microelectrolytic process and can be biochemically treated after being subjected to microelectrolysis-coagulation sedimentation pretreatment, and the favorable conditions are provided for subsequent biochemical treatment.

Description

technical field [0001] The invention relates to a pretreatment method for m-dinitrobenzene production wastewater, belonging to the field of wastewater treatment methods. Background technique [0002] Nitrobenzene compounds are raw materials for the preparation of various amine compounds in the chemical industry, and their production wastewater is difficult to biochemically degrade. Nitro compounds are highly toxic to humans, so the state strictly stipulates that the content of nitro compounds in wastewater shall not exceed 5mg / L (GB8978-1996). At present, there are many treatment methods for nitro compounds at home and abroad, but the treatment effect is not very satisfactory due to the poor biodegradability of nitrobenzene compound wastewater. [0003] Therefore, it has a high application prospect to study a treatment method suitable for m-dinitrobenzene production wastewater with good treatment effect, simple operation and low cost. Contents of the invention [0004] T...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/36
CPCC02F9/00C02F1/003C02F1/461C02F1/52C02F1/66C02F2103/36C02F2201/002C02F2201/461C02F2301/00
Inventor 陆强
Owner SHAANXI HUALU CHEM ENVIRONMENTAL PROTECTION
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