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Method for treating wastewater of terephthalic acid by using aerating bio filter

An aerated biological filter and terephthalic acid technology, which is applied in the field of environmental engineering, can solve the problems of large pH change range, large water volume fluctuation, and high organic matter concentration, and achieves low engineering investment, low operating costs, and small land occupation. Effect

Inactive Publication Date: 2007-05-09
NANJING UNIV
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Problems solved by technology

Although the treatment effect is good, there are TA waste water quality and water volume fluctuations during operation, high concentration of organic matter, wide range of pH changes, and more organic matter that is not easy to degrade, which often causes sludge bulking and weak impact resistance. , The workload of disposal of excess sludge is large and various problems

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  • Method for treating wastewater of terephthalic acid by using aerating bio filter

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Embodiment Construction

[0024] The biological purification process of terephthalic acid (TA) wastewater of the present invention first adopts the process of secondary filtration after the biological purification of the primary aerated biological filter, and its process flow is shown in Figure 1. The process is as follows: TA wastewater is injected into the bottom of the biological aerated filter 3 by the water pump 2 through the regulated sedimentation tank 1, and enters the filter material layer through the long handle filter head inside the tank, and at the same time, the Roots blower 4 aerates and oxygenates the filter material layer , the effluent enters the filter 7 through the backwash pool 5; the effluent from the filter 7 meets the water quality requirements of general industrial water, and can be directly discharged or reused. The backwashing of biological aerated filter 3 adopts air-water combined backwashing. The method is to use the compressed air provided by Roots blower 4 to backwash for...

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Abstract

This invention discloses a method for treating p-phthalic acid wastewater by using aeration biological filtration pool. The method comprises: (1) infusing p-phthalic acid wastewater into a precipitation pool for precipitation; (2) infusing precipitated wastewater the bottom of an aeration biological filtration pool, and entering the filtration layer through a filtration head in the filtration pool; (3) sending the discharged water into a filter for filtration; (4) discharging or recycling qualified discharged water. The filtration layer is filled with wastewater filtration filler, and is covered with a domesticated aerobic biological membrane that is adaptable for p-phthalic acid toxicity. The method utilizes filtration filler and biological membrane as the media, thus fully exploiting biological metabolism, physical filtration, physical adsorption by membrane and adsorbed filler, and multi-stage prey in the reactor to realize the removing of pollutants and bacteria in the same reactor. The method has such advantages as high bioactivity, low energy consumption, low residual sludge content, high organic load tolerance, stable operation, and simple management.

Description

1. Technical field: [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a method for biological treatment of terephthalic acid wastewater by using an aerated biological filter. 2. Background technology: [0002] Terephthalic acid (TA for short) is a petrochemical product widely used in the production of synthetic chemical fibers, plastics, and dyes. It is a common organic pollutant that is toxic to organisms. With the development of modern industry, the production and usage of TA in our country have increased sharply, and a large amount of TA wastewater has also been produced. Effective treatment of TA in wastewater has always been a concern. [0003] For the treatment of high-concentration TA wastewater, acid analysis is generally used to recover TA and reduce wastewater COD cr (chemical oxygen demand, referred to as COD cr ). Its recovery rate of TA can reach 70%~90%, COD cr The removal rate is about 70-80%. H...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/58C02F1/52C02F3/10
CPCY02W10/10
Inventor 张文艺翟建平盛广宏王明媚陈晨
Owner NANJING UNIV
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