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A kind of treatment method of terephthalic acid wastewater

A technology of terephthalic acid and a treatment method, which is applied in the field of treatment of high-concentration terephthalic acid production wastewater, can solve the problem that the device occupies a large area, increases investment costs, fails to meet direct discharge requirements, and discharges excess sludge. problems, to achieve the effect of shortening residence time, shortening residence time, and small output

Active Publication Date: 2015-09-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN89103965.1 proposes to use pretreatment-anaerobic biological treatment-aerobic biological treatment process to treat purified terephthalic acid production wastewater, wherein the anaerobic biological treatment process consists of upflow anaerobic sludge bed, return anaerobic The biological filter bed or the upflow anaerobic composite bed are completed, while the upflow anaerobic sludge bed is easy to block the water distribution, the dead zone is large, and the mixed culture of different biological phases leads to low treatment efficiency. The aerobic process is improved by two stages after anaerobic water effluent Oxygen is completed, so the investment in this process project is high, the operation is complicated, the hydraulic retention time is long, and the COD content in the treated effluent is still around 300mg / L, which cannot meet the requirements for direct discharge and must be incorporated into other sewage treatment systems
CN94118737.3 proposes a method for treating high-concentration PTA production wastewater by a two-stage aerobic biological process with a selector. Although it has a high volume load, and the COD is reduced from 4000 to 7000mg / L to below 80mg / L It meets the discharge standard, but the equipment covers a huge area, which increases the investment cost, and the excess sludge discharge is high, which increases the follow-up sludge treatment cost

Method used

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  • A kind of treatment method of terephthalic acid wastewater
  • A kind of treatment method of terephthalic acid wastewater

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Experimental program
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Effect test

Embodiment 1

[0025] Purified terephthalic acid production wastewater (CODcr is 7870 mg / L, TA concentration is 2417mg / L) is adjusted to about 4.0 by adding acid, and pumped into TA settling tank for solid-liquid separation, and the settled TA is packaged Recycling to reduce the concentration of organic pollutants in wastewater; the wastewater after pH adjustment and solid-liquid separation (CODcr is 5100 mg / L, TA concentration is 1280mg / L) is pumped into the regulating homogeneous tank, and alkali is added to adjust When the pH is about 7.0, nitrogen and phosphorus nutrients are added according to the ratio of CODcr: N: P = 200: 5: 1; the wastewater regulated and treated by the homogeneous tank is pumped into the anaerobic baffle reactor, and the anaerobic baffle reactor Oxygen baffle reactor length × width × height = 2.23 × 0.54 × 1.26m, effective volume 1.05m 3 , the reactor is divided into five compartments by five baffles with a 45° angle at the bottom. There are five exhaust ports on t...

Embodiment 2

[0032] Processing method is as embodiment 1. .The specific operating indicators are:

[0033] The CODcr of purified terephthalic acid production wastewater is 9660mg / L, and the TA concentration is 3062mg / L.

[0034] The effluent after acid precipitation pretreatment is 6450mg / L, and the TA concentration is 1687mg / L.

[0035] Anaerobic baffle reactor effluent 620mg / L, TA concentration 34mg / L, organic volume load 3.80KgCOD / (m 3 ﹒ d).

[0036] The dissolved oxygen in the aerobic activated sludge reactor was 4mg / L, the temperature was 30°C, and the hydraulic retention time was 5h. The strains inoculated with high-efficiency degradation of terephthalic acid were YPC-TA2 and YPC-TA3.

[0037] After aerobic activated sludge treatment, the effluent of the supernatant of the sedimentation tank is 90 mg / L, the concentration of TA is 8mg / L, and the organic volume load is 1.39KgCOD / (m 3 ﹒ d).

Embodiment 3

[0039] Processing method is as embodiment 1. .The specific operating indicators are:

[0040] The CODcr of purified terephthalic acid production wastewater is 8015mg / L, and the TA concentration is 2755mg / L.

[0041] The effluent after acid precipitation pretreatment was 5575mg / L, and the TA concentration was 1428mg / L.

[0042] Anaerobic baffle reactor effluent 670mg / L, TA concentration 28mg / L, organic volume load 3.21KgCOD / (m 3 ﹒ d).

[0043] The dissolved oxygen in the aerobic activated sludge reactor is 4mg / L, the temperature is 30°C, and the hydraulic retention time is 4h. The inoculated terephthalic acid-degrading strain is YPC-TA4.

[0044] After aerobic activated sludge treatment, the effluent of the supernatant of the sedimentation tank is 75mg / L, the concentration of TA is 7mg / L, and the organic volume load is 1.44KgCOD / (m 3 ﹒ d).

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Abstract

The invention discloses a processing method of terephthalic acid waste water. Combined pretreatment-anaerobic treatment-aerobic treatment technology is adopted, and the processing method comprises following steps: the terephthalic acid waste water is subjected to acid precipitating pretreatment, and terephthalic acid is recycled after solid-liquid separation; the pretreated waste water is adjusted by adding alkali, nitrogen and phosphor, and then is delivered into an improved granular-bed anaerobic baffled reactor for anaerobic biochemical treatment so as to remove most of the organic pollutant in the waste water; the treated waste water is delivered into an aerobic activated sludge reactor for aerobic biochemical treatment, and is delivered into a sedimentation basin for sludge and water separation after aerobic biochemical treatment; and obtained supernatant is discharged after reaching the emission standards. The processing method is advantaged in simple technology, less time consume, high efficiency, less sludge residual, and low investment and operation cost. In addition, the terephthalic acid waste water processed via the processing method is capable of reaching national emission standards.

Description

technical field [0001] The invention relates to a treatment method for industrial wastewater, in particular to a treatment method for high-concentration terephthalic acid production wastewater. Background technique [0002] Purified terephthalic acid (PTA) is refined from terephthalic acid (TA). It is an important petrochemical product, and a large amount of wastewater is generated in the production process; this wastewater has a high concentration and a large amount of water, mainly containing Organic pollutants such as terephthalic acid, acetic acid, methyl acetate, and toluic acid, among which terephthalic acid has a high concentration (1400~4500mg / L), is the main refractory pollutant in the wastewater; and water quality, water quantity The range of change is large, and it is a kind of industrial wastewater that is difficult to treat. However, due to the increasing market demand for PTA and the continuous expansion of PTA production capacity, it is increasingly urgent to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C07C63/26C07C51/41
Inventor 王哲明吕效平黄勇罗翔杨忠林吴叶宽韩萍芳钟中章晓春蔡晓健郭玉旗
Owner CHINA PETROLEUM & CHEM CORP
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