CN102627374A - Treatment process for high-concentration methanol and ammonia nitrogen wastewater produced in production process of quaternary ammonium salt - Google Patents

Abstract

The invention relates to a treatment process for high-concentration methanol and ammonia nitrogen wastewater produced in a production process of quaternary ammonium salt, and belongs to wastewater treatment in the field of chemical industry. According to the treatment process, aiming at the high-concentration methanol and the ammonia nitrogen wastewater, an A/O (Anacrobic/Oxic) combination process is adopted, so that the ammonia nitrogen can be removed while the organic matters are removed. The treatment process has the benefits as follows: 1, a biological contact oxidation process can adapt organic polluted water with different concentrations and has the characteristics of higher impact resistance on water fluctuation, shorter hydraulic retention time (HRT) and high removal rate of SS (Suspended Substance), BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and ammonia nitrogen and the like; 2, the running performance is stable, few excess sludges are produced, and the running expense is reduced; 3, the methanol concentration is controlled to be not more than 100 mg/l through reflux so as to facilitate microorganism growth; and 4, pollutants can be effectively removed through prolonging the retention time of a hydrolytic acidification pond and a contact oxidation pond by about 30 h and about 28 h.

Description

The high concentration methanol that the quaternary ammonium salt production process produces and the treatment process of ammonia nitrogen waste water

Technical field

The present invention relates to a kind of high concentration methanol of quaternary ammonium salt production process generation and the treatment process of ammonia nitrogen waste water, belong to the processing of chemical field waste water.

Background technology

Methanol rectifying tower distillation residual liquid, sewage and the ground wash-down water of spent process water that produces in the quaternary ammonium salt production process and recovery methyl alcohol contain high concentration methanol, ammonia nitrogen and quaternary ammonium salt in the factory effluent, methyl alcohol is a kind of organism simple in structure; In the anaerobic biological treatment process, methanogen can be methanol conversion a methane directly, can be acetate with methanol conversion also; Then acetate is converted into methane, but can be to the microorganisms toxic action, when quaternary ammonium salt concentration is higher than 120mg/l during excessive concentration; To produce toxic action to follow-up biochemical system; Suppress microbial growth, thereby lose degradation capability, the sewage after the processing can't be up to standard.

Summary of the invention

To the technical problem that exists in the prior art, the object of the present invention is to provide the high concentration methanol of the good quaternary ammonium salt production process generation of a kind of treatment effect and the treatment process of ammonia nitrogen waste water.

The technical scheme that the present invention adopts is following:

The high concentration methanol that the quaternary ammonium salt production process produces and the treatment process of ammonia nitrogen waste water is characterized in that, comprise Sewage treatment systems and sludge treating system;

Sewage treatment systems, waste water are at first passed through grille well, remove big impurity; Get into equalizing tank then, establish diving mixer in the equalizing tank, the sewage homogeneous is all measured through stirring action; Waste water gets in the hydrolysis acidification pool through lift pump then, carries out denitrification denitrogenation, removes partial organic substances and improves wastewater biodegradability; Water outlet gets into contact-oxidation pool, further removes organic components and carries out nitration reaction, and carry out mixed-liquor return toward hydrolysis acidification pool, forms the A/O combination process; Water outlet gets into second pond, qualified discharge;

When having an accident, waste water gets into accident pool, wait to recover normal after, quantitatively squeeze into equalizing tank by accident pool more in batches;

Sludge treating system; The second pond supernatant is back to equalizing tank, and second pond part mud is back to hydrolysis acidification pool, and the same hydrolysis acidification pool of excess sludge, contact-oxidation pool sludge discharged drain into sludge thickener; Concentrate; Mud after concentrating is squeezed into chamber(filter)press through spiral pump and is dewatered, and filtrating is back to equalizing tank, and the mud cake outward transport is disposed.

The high concentration methanol that quaternary ammonium salt production process of the present invention produces and the treatment process of ammonia nitrogen waste water to high concentration methanol and ammonia nitrogen waste water, adopt the combination process of A/O, and this combination process can also be removed ammonia nitrogen in the organic while of removal, has following advantage:

1, biological contact oxidation process can adapt to the organic sewage of different concns, and variation water quality is had strong shock resistance, and the required residence time, (HRT) was shorter, and clearances such as SS, BOD, COD and ammonia nitrogen are high.

2, operating performance is stable, and it is few to produce surplus sludge volume, has reduced working cost.

3, advance biochemical methanol concentration in 100mg/l through the control that refluxes, be beneficial to microbial growth.

4, through strengthening the residence time of hydrolysis acidification pool contact-oxidation pool, hydrolysis acidification pool is about 30 hours residence time, and contact-oxidation pool is about 28 hours, with effective removal pollutent.

Description of drawings

For the ease of it will be appreciated by those skilled in the art that the present invention is further described below in conjunction with accompanying drawing.

Fig. 1 is the schema of treatment process of the present invention.

Embodiment

See also Fig. 1, the high concentration methanol that the quaternary ammonium salt production process produces and the treatment process of ammonia nitrogen waste water comprise Sewage treatment systems and sludge treating system, wherein,

Sewage treatment systems, waste water are at first passed through grille well, remove big impurity; Get into equalizing tank then, establish diving mixer in the equalizing tank, the sewage homogeneous is all measured through stirring action; Waste water gets in the hydrolysis acidification pool through lift pump then, carries out denitrification denitrogenation, removes partial organic substances and improves wastewater biodegradability; Water outlet gets into contact-oxidation pool, further removes organic components and carries out nitration reaction, and carry out mixed-liquor return toward hydrolysis acidification pool, forms the A/O combination process; Water outlet gets into second pond, qualified discharge (a large amount of qualified discharges are back to equalizing tank on a small quantity).

When having an accident, waste water gets into accident pool, wait to recover normal after, quantitatively squeeze into equalizing tank by accident pool more in batches.

Sludge treating system; The second pond supernatant is back to equalizing tank, and second pond part mud is back to hydrolysis acidification pool, and the same hydrolysis acidification pool of excess sludge, contact-oxidation pool sludge discharged drain into sludge thickener; Concentrate; Mud after concentrating is squeezed into chamber(filter)press through spiral pump and is dewatered, and filtrating is back to equalizing tank, and the mud cake outward transport is disposed.

Above content only is to give an example and explanation to what technology of the present invention was done; Under the technician in present technique field described specific embodiment is made various modifications or replenish or adopt similar mode to substitute; Only otherwise depart from the technology of invention or surmount the defined scope of these claims, all should belong to protection scope of the present invention.

Claims (1)

1. the high concentration methanol of quaternary ammonium salt production process generation and the treatment process of ammonia nitrogen waste water is characterized in that, comprise Sewage treatment systems and sludge treating system;

Sewage treatment systems, waste water are at first passed through grille well, remove big impurity; Get into equalizing tank then, establish diving mixer in the equalizing tank, the sewage homogeneous is all measured through stirring action; Waste water gets in the hydrolysis acidification pool through lift pump then, carries out denitrification denitrogenation, removes partial organic substances and improves wastewater biodegradability; Water outlet gets into contact-oxidation pool, further removes organic components and carries out nitration reaction, and hydrolysis acidification pool is carried out mixed-liquor return, forms the A/O combination process; Water outlet gets into second pond, qualified discharge;

When having an accident, waste water gets into accident pool, wait to recover normal after, quantitatively squeeze into equalizing tank by accident pool more in batches;

Sludge treating system; The second pond supernatant is back to equalizing tank, and second pond part mud is back to hydrolysis acidification pool, and the same hydrolysis acidification pool of excess sludge, contact-oxidation pool sludge discharged drain into sludge thickener; Concentrate; Mud after concentrating is squeezed into chamber(filter)press through spiral pump and is dewatered, and filtrating is back to equalizing tank, and the mud cake outward transport is disposed.

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