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Process for treating waste water of nitrobenzene, 2,4-dinitrophenol, p-nitro-chlorebenzene

A technology of p-nitrochlorobenzene and dinitrophenol, which is applied to nitrobenzene and 2, can solve the problems of low investment, low operating cost, and simple process flow, and achieve small footprint, convenient management, and shortened migration path Effect

Active Publication Date: 2005-01-05
江苏环保产业股份有限公司
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Problems solved by technology

[0004] Alkaline or neutral organic industrial wastewater with high chroma and refractory nitrobenzene, 2,4-dinitrophenol, p-nitrochlorobenzene, etc. has not yet had a simple process, low investment, and low operating costs. method

Method used

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  • Process for treating waste water of nitrobenzene, 2,4-dinitrophenol, p-nitro-chlorebenzene

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Embodiment Construction

[0016] As can be seen from accompanying drawing 1, the specific implementation method of the inventive method is: the alkaline nitrobenzene production waste water in the distribution tank 1 or the neutral waste water after adjusting the pH value to 7-8 through 98% sulfuric acid pump into activated carbon Particle swarm electrocatalysis device 2, control the influent flow rate to 200-1000l / h, the residence time of wastewater to 20-60min, the operating voltage of the device to 20-50v, the current to 10-30A, the effluent is buffered through the intermediate pool 3 and passed through the microporous filter 4 After filtering, it enters the intermediate pool 5 and uses 98% sulfuric acid to adjust the pH value, and the tail water reaches the first-class discharge standard in Table 4 of the national GB8978-1996 "Comprehensive Wastewater Discharge Standard".

[0017] For neutral waste water, the intermediate pool 5 in the above flow chart can be omitted.

[0018] Table 1 and Table 2 ar...

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Abstract

The invention is a method of processing the waste water containing nitrobenzene, 2, 4- dinitrophenol and para-nitrochlorobenzene, pumping the basic waste water in a water distributing tank or the neutral water produced by using 98% sulphuric acid to regulate the pH value up to 7-8, into an electro-catalyzing device with activated carbon particle group, the voltage and current of the device, staying for a short time and then making the outgoing water pass through a medium tank for buffering, adding in 98% sulphuric acid to regulate the pH value up to primary effluent standard in the list 4 of 'Sewage Synthetic Effluent Standard' of the national GB8978-1996 and discharging. It has characters of effective degrading the industrial waste water containing nondegradable basic or neutral organic pollutants like nitrobenzene, 2, 4- dinitrophenol, para-nitrochlorobenzene, etc.

Description

technical field [0001] The invention relates to a method for treating alkaline or neutral organic waste water such as high chroma and refractory nitrobenzene, 2,4-dinitrophenol and p-nitrochlorobenzene produced in the production process of nitrobenzene. Background technique [0002] A large amount of wastewater is discharged during the production of nitrobenzene. The main pollutants are nitrobenzene, 2,4-dinitrophenol, p-nitrochlorobenzene and other refractory organic pollutants. The wastewater is alkaline and dark in color. Among them, the concentration of nitrobenzene is about 4.0-300.0mg / L; 2,4-dinitrophenol is 190.0-2200.0mg / L; p-nitrochlorobenzene is 80.0-100.0mg / L; the color is about 20000; pH for 10-11. Nitrobenzene and p-nitrochlorobenzene are highly toxic chemicals that are refractory to biodegradation and have toxic effects on the human body and ecosystem. The National Environmental Protection Agency has included them in the list of 68 priority pollutants. The di...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F9/02C02F9/06
Inventor 李国平王志良吴海锁张利民夏明芳熊孝华
Owner 江苏环保产业股份有限公司
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