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Method for performing ozone catalysis-coupled biological nitrification treatment on acrylonitrile wastewater

A technology for catalytic oxidation of acrylonitrile wastewater and ozone, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of sensitive external environment, inability to effectively remove ammonia nitrogen, and difficult to achieve Emission requirements and other issues to achieve the effect of enhancing impact resistance

Active Publication Date: 2015-03-18
CNOOC TIANJIN CHEM RES & DESIGN INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The nitrifying bacteria involved in biological denitrification are autotrophic bacteria, which are sensitive to the external environment and are easily inhibited by poisonous and harmful substances, so that the effective removal of ammonia nitrogen cannot be achieved.
Therefore, after secondary biochemical treatment of acrylonitrile wastewater, COD and ammonia nitrogen are difficult to meet the discharge requirements, especially the ammonia nitrogen index, and the concentration of the effluent is much higher than the standard requirement, which has brought great environmental protection pressure to the enterprise.

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  • Method for performing ozone catalysis-coupled biological nitrification treatment on acrylonitrile wastewater

Examples

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Effect test

Embodiment 1

[0021] The acrylonitrile wastewater of a refinery company is 2400 m3 / d, which is currently treated by a secondary biochemical process. The results show that the existing process has no effect on ammonia nitrogen removal. On the contrary, due to biochemical hydrolysis, organic nitrogen is converted into ammonia nitrogen, resulting in a much higher ammonia nitrogen in the effluent In the influent ammonia nitrogen. In addition, because the influent water contains a large amount of refractory organic matter, the COD of the effluent has exceeded the standard. Therefore, it is planned to adopt the process method of ozone catalytic oxidation coupled with biological nitrification of the present invention, add an advanced treatment unit on the basis of the original secondary biochemical treatment process, and carry out a field pilot test with a scale of 15m3 / d.

[0022] The pre-oxidation tower is filled with stainless steel Pall ring packing, and the catalytic oxidation tower is filled...

Embodiment 2

[0025] The acrylonitrile waste water of a refinery company is 2000m3 / d, and the SBR process is currently used for biochemical treatment. The biochemical effluent contains a certain concentration of ammonia nitrogen, and the COD occasionally fails to meet the standard. Using the process method of ozone catalytic oxidation coupled with biological nitrification of the present invention, the company's biochemical effluent was carried out for 16 m 3 / d pilot test to solve the problem of wastewater discharge standards.

[0026] The pre-oxidation tower is filled with stainless steel Pall rings, and the catalytic oxidation tower is filled with columnar activated carbon and γ-Al 2 o 3 It is a mixture of carrier heterogeneous catalysts; the dosage of ozone in wastewater is (10-100) mg / L, and the residence time of the ozone oxidation tower is (0.25-1) h. The nitrification tank adopts the form of BAF, and the hydraulic retention time is 6h. Add sodium carbonate and sodium hydroxide mi...

Embodiment 3

[0029] The acrylonitrile wastewater of a petrochemical company is 9600 m3 / d, which is currently treated by pure oxygen aeration and biological contact oxidation process. The biochemical effluent has a high COD and contains a certain concentration of ammonia nitrogen. A small-scale test was carried out on the company's biochemical effluent by using the process method of ozone catalytic oxidation coupled with biological nitrification of the present invention, as an engineering basis for the transformation of the company's sewage treatment system.

[0030] The pre-oxidation tower is filled with θ ring packing, and the catalytic oxidation tower is filled with columnar activated carbon as a catalyst; the ozone dosage of wastewater is (100-200) mg / L, and the residence time in the ozone oxidation tower is (1-2 ) h. The nitrification tank adopts the form of BAF, and the hydraulic retention time is 3h. Add sodium hydroxide solution in the ozone removal tank to control the pH value in...

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Abstract

The invention proposes a method for performing ozone catalysis-coupled biological nitrification treatment on acrylonitrile wastewater. The method is characterized in that the deep treatment is carried out on the acrylonitrile wastewater by adopting a technology of combining ozone catalytic oxidization with biological nitrification. The method comprises the main processes as follows: carrying out balance of quality and quantity of rainfall entering an adjusting pool (1), removing residual ozone in water from an ozone removal pool (5) after the rainfall flows through a pre-oxidization tower (3) and a catalytic oxidization tower (4); carrying out ammonia nitrogen removal through a nitrifying pool (7), discharging final produced water from a clean water tank (8); supplying the alkalinity required for nitrification through an alkali tank (10); and carrying out concentrated treatment after tail gas of an ozone oxidization tower is collected.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for treating acrylonitrile wastewater by coupling ozone catalysis with biological nitrification. Background technique [0002] Acrylonitrile wastewater is a difficult point in industrial wastewater treatment. During the production of a series of chemical products derived from acrylonitrile, a large amount of nitrogen-containing organic wastewater is produced. There are two main types of pollutants in this type of wastewater: one is final products such as acrylic fiber and polyacrylamide and macromolecular intermediates, which have a high degree of polymerization, are difficult to biodegrade, and are difficult to remove through biochemical action; Production raw materials and some oligomer intermediates, such as organic nitriles and oligomer intermediates, etc. These pollutants have strong biological toxicity and have a certain inhibitory effect on microbial activity. Af...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F101/38
Inventor 陆彩霞陈爱民钱光磊邵强张艳芳陈军
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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