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Plasticizer production wastewater treatment method

A technology for the production of wastewater and treatment methods, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of large investment in treatment facilities and unsatisfactory results, and achieve sludge reduction The effect of treatment and disposal costs, less sludge production, and simple operation and management

Inactive Publication Date: 2015-02-18
XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] This type of plasticizer production wastewater belongs to high-concentration organic wastewater. At present, domestic manufacturers generally use physical and chemical methods to treat this wastewater or perform biochemical treatment after moderate dilution. The investment in treatment facilities is large and the effect is not ideal.

Method used

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  • Plasticizer production wastewater treatment method

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Effect test

Embodiment 1

[0021] Aiming at the characteristics of non-continuous and uniform discharge of wastewater and large changes in water quality, an adjustment pool is set up to balance the water quantity and quality, and acid is added here to adjust the pH to 6.0-7.0, and the residence time is 24h; according to the biological nutritional balance BOD5: N: P=100: The ratio of 5:1, potassium dihydrogen phosphate and urea are appropriately added to the wastewater; in order to control the sulfate content of wastewater and meet the basic requirements of subsequent biochemical water treatment, it is necessary to mix domestic sewage and tap water before treatment to make sulfate The concentration is lower than 3000 mg / L, and the COD concentration is lower than 15000 mg / L; the wastewater enters the anaerobic treatment tank with filler from the distribution tank, the residence time is 72h, and the treatment load is 5kgCOD / m 3 .d; The biofilm oxidation tank is divided into a zone and a zone two, the first zo...

Embodiment 2

[0022] Embodiment 2: Treatment effect

[0023] The plasticizer production wastewater treatment method of the present invention is used to treat plasticizer production wastewater from a plasticizer production plant, and the treatment effect is shown in Table-1.

[0024] Table-1 Treatment effect

[0025]

[0026] It can be seen from Table 1 that in the treatment method of the present invention, the COD removal rate is 97.72%-99.96%, the volatile phenol removal rate is 9.09%-28.89%, and the pollutant emission concentration reaches the first-level emission standard.

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Abstract

The invention relates to a plasticizer production wastewater treatment method, and belongs to the field of wastewater treatment methods. The plasticizer production wastewater treatment method comprises steps as follows: water quantity and water quality of wastewater are balanced in a regulating tank, and acid is added to regulate the PH value of the wastewater to 6.0-7.0; meanwhile, the content proportion of phosphorus and nitrogen in the wastewater is regulated according to biological nutrient balance; then the wastewater is pumped into a service reservoir; the COD (chemical oxygen demand) value and the sulfate ion concentration of the wastewater are regulated by adding tap water in the service reservoir; the waste water enters an anaerobic treatment tank suspended with filler from the service reservoir for anaerobic treatment; the wastewater after anaerobic treatment enters a biological membrane oxidation tank for aeration oxidation treatment; and the wastewater after oxidation is subjected to sludge separation and is discharged as treated water up to standard. According to the plasticizer production wastewater treatment method, the biological membrane oxidation method is adopted to treat plasticizer production wastewater, the treatment effect is remarkable, the effluent quality is good, the engineering cost is low, the running is stable, the maintenance is simple, the operation is convenient, and the effect is remarkable.

Description

Technical field [0001] The invention relates to a treatment method of plasticizer production wastewater, belonging to the field of wastewater treatment methods. Background technique [0002] Plasticizers are the most consumed type of additives in plastic processing. There are nearly 100 plasticizer factories in my country, with a production capacity of about 900,000 tons and a demand of about 700,000 tons. The main varieties are dibutyl phthalate. (DBP) and dioctyl phthalate (DOP) and so on. [0003] Introduction to the production process of DBP and DOP: The domestic production of DBP and DOP generally adopts sulfuric acid catalytic esterification process or non-acid catalytic esterification process. The amount of waste water and water quality produced by these two production processes are quite different. The sulfuric acid catalytic esterification process is 0.3 % Concentrated sulfuric acid is used as a catalyst, phthalic anhydride and butanol (or octanol) undergo an esterificatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/36
Inventor 陆强
Owner XIAN HUALU ENVIRONMENTAL PROTECTION EQUIP
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