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Processing method for waste water in production process of fine terephthalic acid

A technology for producing purified terephthalic acid and waste water, which is applied in biological water/sewage treatment, natural water treatment, sustainable biological treatment, etc., and can solve problems such as failure to meet direct discharge requirements, secondary pollution, and complex operation , to achieve the effects of reducing the amount of excess sludge produced, improving the impact of operating load, and improving the efficiency of biochemical degradation

Active Publication Date: 2008-12-31
SINOPEC YANGZI PETROCHEM
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Problems solved by technology

Chinese patent CN89103965.1 proposes to use anaerobic-aerobic (or two-stage aerobic) process to treat purified terephthalic acid production wastewater, wherein the anaerobic process is completed by anaerobic sludge bed and anaerobic filter. The oxygen process is completed by an aerobic reactor with fillers or two-stage aerobic process. This process requires high investment, complicated operation, and long hydraulic retention time. The COD content in the treated effluent is still about 300mg / l, which cannot reach Direct Emissions Requirements
The operating conditions of the anaerobic reactors of the above two processes are relatively harsh, the airtight performance is better, the range of pH is more restricted, the process operation is complicated, and the removal rate of terephthalic acid (TA) substances in the anaerobic process is low at the same time. Generally less than 50%
ZL 94118737.3 invented a two-stage aerobic biological process with a selector to treat high-concentration terephthalic acid wastewater, and ZL 96109791.4 proposed a first-stage and second-stage aerobic reactor with separate sludge settlement The method of producing wastewater with high concentration of terephthalic acid in the tank and sludge return system, although the COD volume load of the primary reactor and the COD volume load of the secondary reactor of the two methods are relatively high, and the effluent meets the discharge standard, but the device occupies an area The area is huge, and the amount of excess sludge discharge is high, which increases the cost of sludge treatment and causes secondary pollution

Method used

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  • Processing method for waste water in production process of fine terephthalic acid

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Embodiment 1

[0022] process such as figure 1 shown.

[0023] Pump purified terephthalic acid production wastewater (COD 4000mg / L, terephthalic acid concentration 1200mg / L) into catalytic oxidation reaction tank 1, catalytic oxidation reaction tank 1 is a vertical cuboid structure, length × width × height = 2 ×2×3m, the interior of the reaction tank is parallel to the length direction, and two rectangular deflectors are installed vertically and symmetrically to the bottom of the tank. 0.25m from the width side, 0.25m from the bottom of the pool, and 0.25m from the upper edge. Perforated aeration PVC pipes were installed at the bottom of the pool, φ15mm×5, and 2% (mass fraction) of total water was added to the pool with granular activated carbon (20-50 mesh). The air is passed into the catalytic oxidation reaction tank 1 through the perforated aeration pipe at the bottom, and the air velocity is 50m 3 / h, oxidation reaction for 1 hour, the wastewater after the oxidation reaction enters th...

Embodiment 2

[0029] Processing method is as embodiment 1. The COD of purified terephthalic acid production wastewater is 4500mg / L, the concentration of terephthalic acid is 1400mg / L, the sludge concentration of the primary membrane bioreactor tank is 7.3g / L, and the efficient terephthalic acid degradation strain is YPC-TA2, which controls the dissolution Oxygen is 1.0mg / L, the sludge concentration in the secondary membrane bioreaction tank is 3.2g / L, the terephthalic acid degradation strain is YPC-TA2, the dissolved oxygen is controlled at 2.0mg / L, and the biochemical reaction temperature is 32°C. The specific operating indicators are as follows:

[0030] The effluent COD of the catalytic oxidation reaction pool is 3460mg / L, and the concentration of terephthalic acid is 1092mg / L.

[0031] The effluent COD of the primary membrane bioreactor tank is 212mg / L, the concentration of terephthalic acid is 15mg / L, and the organic volume load reaches 3.2kgCOD / m 3 .d.

[0032] The effluent COD of ...

Embodiment 3

[0034] Processing method is as embodiment 1. The COD of purified terephthalic acid production wastewater is 5000mg / L, and the concentration of terephthalic acid is 1700mg / L. The sludge concentration in the first-stage membrane bioreaction tank is 7.6g / L, the highly efficient terephthalic acid degradation strain is YPC-TA3, and the dissolved oxygen is controlled at 1.0mg / L. The sludge concentration in the second-stage membrane bioreaction tank is 3.6g / L. The high-efficiency dicarboxylic acid degradation strain is YPC-TA3, the dissolved oxygen is controlled at 2.0mg / L, and the biochemical reaction temperature is 32°C. The specific operating indicators are as follows:

[0035] The effluent COD of the catalytic oxidation reaction tank is 3970mg / L, and the concentration of terephthalic acid is 1292mg / L.

[0036] The effluent COD of the primary membrane bioreactor tank is 236mg / L, the concentration of terephthalic acid is 18mg / L, and the organic volume load reaches 3.8kgCOD / m 3 ....

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Abstract

The invention discloses a purified terephthalic acid wastewater treatment method, which treats the purified terephthalic acid wastewater through highly efficient catalytic oxidation and dual-membrane bio-reaction tank combined technology to enable the COD of the wastewater to be reduced from 4,000-6,000 mg / L to 100 mg / L below, and enable the terephthalic acid to be reduced from 1,000-2,000 mg / L to 10 mg / L below. The catalytic oxidation takes air and chlorine dioxide as an oxidant, and takes activated carbon as a catalyst; the organic volumetric load of a primary membrane bio-reaction tank reaches 2.85-4.5kg COD / m3.d, while the organic volumetric load of a secondary membrane bio-reaction tank reaches 0.4-0.8kg COD / m3.d.

Description

technical field [0001] The invention relates to a treatment method for waste water, in particular to a treatment method for high-concentration purified terephthalic acid production waste water. Background technique [0002] Purified terephthalic acid (PTA) is an important petrochemical product whose output ranks among the top 50 in the world. It is the main raw material for the production of polyester (PET), and is widely used in fiber polyester, polyester film, packaging bottles, and PBT engineering plastics. , Plastic plasticizers, pesticides and dyes and other production fields. The wastewater produced during its production process contains organic pollutants such as terephthalic acid, acetic acid, methyl acetate, and methyl benzoic acid, among which terephthalic acid (TA) has the highest content (1400-4500mg / L), which is the index pollutants. PTA production wastewater has high COD concentration (up to 10000mg / L), especially high COD concentration caused by aromatic com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/72C02F3/12C02F103/36
CPCY02W10/10
Inventor 陈俊沈树宝黄勇陆建华王桂林章晓春罗翔陈英文黄秋明周立进王洪丽王峰韩晓磊
Owner SINOPEC YANGZI PETROCHEM
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