A kind of treatment method and treatment system of nitrochlorobenzene production wastewater

Abstract

A treatment method and a treatment system for nitrochlorobenzene production waste water. The method comprises the following steps: pumping nitrochlorobenzene production waste water into an adjustment pool, adjusting the pH value to allow the waste water to be acidic, then allowing the waste water to enter an oxidation pool, adding oxidizing agents of sodium hypochlorite, calcium hypochlorite or hypochloric acid for chemical oxidation treatment, discharging the effluent from the oxidation pool into a neutralization pool, adjusting the pH value to allow the effluent to be neutral, discharging the effluent from the neutralization pool into a coagulation pool, adding coagulants of one or more than one of polyaluminium chloride, polyferric chloride, and polyacrylamide for a coagulation reaction, discharging the effluent from the coagulation pool into a sedimentation pool, allowing a supernatant obtained by sedimentation and separation in the sedimentation pool to overflow into a clean water pool, discharging the clean water that reaches the standard, concentrating and filtering sedimentated sludge at the bottom of the sedimentation pool for safety treatment, and discharging waste liquid generated during the concentration and filtration process into the adjustment pool for re-treatment. According to the invention, the removal rate of nitrochlorobenzene and other nitrobenzene compounds in effluent of the nitrochlorobenzene production waste water treated by the method of the invention is up to 99%, and the method of the invention has the advantages of high treatment efficiency, low operation cost, no secondary pollution, and the like.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method and a treatment system for nitrochlorobenzene production wastewater. Background technique [0002] Nitrochlorobenzene (Nitrochlorobenzenes) is a class of chlorine-containing nitro-aromatic hydrocarbon compounds, widely used as intermediates in the production of medicines, dyes and pesticides, and my country is one of the countries with the largest output of o- and p-nitrochlorobenzenes in the world . In 2002, the world's output of nitrochlorobenzene compounds was 430,000 t / a, and China's output was 330,000 t / a, accounting for 76.7% of the world's total output. In 2003, my country's output of nitrochlorobenzene reached 370,000 tons, an annual increase of 12%. [0003] Nitrochlorobenzene will enter the environment through many ways and become pollutants. Some studies have shown that o-nitrochlorobenzene is a genotoxin and has "triple-induced" effects. ...

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Problems solved by technology

[0006] The above patents and studies have shown that for refractory nitrochlorobenzene wastewater with complex components and high concentrations, the use of a single treatment process such as biodegradation, chemical (catalytic) oxidation, electrochemical oxidation, and activated carbon adsorption is due to toxicity inhibition and operating costs. High, secondary pollution and incomplete mineralization of organic matter, etc., it is difficult to operate stably and efficiently in practical applications

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