A method for treating nitrobenzene wastewater by using an ozone aerated biological filter and its application

A technology of nitrobenzene wastewater and biofilter, which is applied in the direction of sustainable biological treatment, biological water/sewage treatment, oxidized water/sewage treatment, etc., can solve the problems of long residence time, large floor area, and high treatment cost. Reach the effect of reducing treatment cost, reducing dosage, and efficiently degrading

Inactive Publication Date: 2016-08-17
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems of high treatment cost, large floor area and long residence time of the existing ozone oxidation method combined with biological method for treating nitrobenzene wastewater, the present invention provides a method for treating nitrobenzene wastewater by using an ozone aerated biological filter The method and its application, make full use of the catalytic properties of zeolite, the oxidation properties of ozone, limit the oxidation of nitrobenzene, improve the biodegradability; make full use of the co-metabolism properties of microorganisms to degrade refractory organic matter, high oxygen concentration in ozone, biofilter Strong adaptability and other characteristics, the combination of zeolite-catalyzed ozone oxidation of nitrobenzene to improve biodegradability and zeolite biological aerated filter is a simple, effective and low-cost method for treating nitrobenzene wastewater

Method used

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  • A method for treating nitrobenzene wastewater by using an ozone aerated biological filter and its application

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Effect test

Embodiment 1

[0038] The structure of the device used to process nitrobenzene waste water in the present invention is as figure 1 As shown, it comprises a water tank 1, a pump 2, a reactor 3, an ozone generator 6, an oxygen cylinder 7, an exhaust absorption bottle 8 and a tail water tank 9, and the bottom of the reactor 3 is provided with a water inlet and an air inlet, and the reactor 3 The upper part is provided with air outlet 4 and water outlet 5, and air outlet 4 is connected with tail gas absorption bottle 8, and water outlet 5 is connected with tail water tank 9. The water tank 1 is connected to the pump 2, the pump 2 is connected to the water inlet of the reactor 3 through a pipeline, and the air inlet of the reactor 3, the ozone generator 6 and the oxygen bottle 7 are connected through pipelines in sequence.

[0039] For the treatment of nitrobenzene wastewater, the nitrobenzene wastewater in this embodiment is nitrobenzene, NH 4 Cl, KHPO 4 , and ethanol, in which the concentrati...

Embodiment 2

[0045] Start the ozone biological aerated filter according to steps (1) to (3) in Example 1, the difference is that the hydraulic retention time during the operation of the biological aerated filter in step (4) is 8 hours, and it runs for half a month , sampling analysis every day, the final removal rate of nitrobenzene was 94%, the removal rate of COD was 96%, and the removal rate of ammonia nitrogen was 76%.

Embodiment 3

[0047] Start the ozone biological aerated filter according to steps (1)~(3) in embodiment 1, the difference is that the hydraulic retention time in the biological aerated filter operation process in the step (4) is 10 hours, and the ozone concentration is 100mg / L, running for half a month, sampling analysis every day, the final removal rate of nitrobenzene was 99%, the removal rate of COD was 96%, and the removal rate of ammonia nitrogen was 78%.

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Abstract

The invention discloses a method for treating nitrobenzene wastewater by using ozone biological aerated filter and application thereof and belongs to the field of sewage treatment. The treatment method comprises the following steps: (1) constructing a biological filter; (2) starting an air aerated biological filter; (3) starting an ozone biological aerated filter; (4) running the ozone biological aerated filter. The catalytic oxidation and the biological oxidation of ozone zeolite are integrated, the strong oxidative of the ozone is used for opening the ring of the nitrobenzene, the nitrobenzene after ring opening is used as an easily degradable matrix to participate in co-metabolism degradation of nitrobenzene, the removal effect of the nitrobenzene is improved, the biological film growing on the zeolite filler at the upper part of a reactor is used for degrading oxidation products, and the efficient degradation of the nitrobenzene is realized in the same reactor. Through the adoption of the biological aerated filter disclosed by the invention, removable efficiency of the nitrobenzene can reach 90% or above; the biological aerated filter has the advantages of small floor area, high nitrobenzene removal efficiency, convenient starting and simple operation.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for treating nitrobenzene wastewater by using an ozone aerated biological filter and an application thereof. Background technique [0002] my country is a country with scarce water resources, and the per capita water resource is only 2240 cubic meters, which is about 1 / 4 of the world average level. Industrial wastewater is one of the important sources of water pollution in my country. The treatment and reuse of industrial wastewater can not only reduce pollution, but also alleviate the shortage of water resources in my country. It is an effective way to realize circular economy and develop ecological civilization. . Nitrobenzene is an important chemical raw material with a wide range of applications. However, nitrobenzene wastewater seriously pollutes the environment and endangers human health. Nitrobenzene wastewater has stable chemical properties and poor ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F1/78
CPCY02W10/10
Inventor 李睿华孙茜茜胡俊松张晓梅刘卓沈建华肖才林
Owner NANJING UNIV
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