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Method for treating nondegradable organic wastewater by oxidation by transition metal catalyst

A technology of transition metal catalysis and organic wastewater, which is applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc. It can solve the problems of ecological environment deterioration, hindering industrial development, and easy loss of catalysts, etc., to achieve The effect of thorough reaction, shortened residence time, and reduced sludge production

Inactive Publication Date: 2013-10-30
上海睿优环保工程技术有限公司
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  • Application Information

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Problems solved by technology

Biorefractory organic wastewater often contains chemical components that inhibit the normal activities of microorganisms, or contains stable pollutants that are difficult to be digested and decomposed by microorganisms, and most sewage treatment plants use flocculation sedimentation and biological treatment to treat pollutants. Therefore, Most refractory pollutants are discharged in a non-decomposed state, resulting in water pollution, ecological environment deterioration, threats to human health, and hindering the development of related industries; and the emerging advanced oxidation treatment method is easy to lose catalyst, lose The reaction requires high temperature and high pressure, harsh conditions, high cost of oxidant, immature equipment and technology, etc., which limit its application. Therefore, the purification treatment of this kind of refractory organic wastewater has become an urgent problem to be solved in the field of environmental protection technology at home and abroad at this stage. a problem of

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  • Method for treating nondegradable organic wastewater by oxidation by transition metal catalyst

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Effect test

Embodiment 1

[0020] Wastewater from an organic chemical factory has COD487mg / L, pH=2. Use NaOH to adjust the pH of the wastewater to 3 in the preparation tank, then the wastewater enters the three-phase reactor, and the transition metal catalyst with a mass ratio of 0.01‰ to the wastewater is added to the three-phase reactor, stirred, and gas is introduced at the bottom of the reactor Compressed air with a water ratio of 5, a reaction time of 0.5 hours, and Ca(OH) 2 Adjust the pH of the effluent to 7, add polyacrylamide with a mass ratio of 0.002‰ to the wastewater, and separate the mud and water in the sedimentation tank. The COD of the effluent is 79mg / L, and the removal rate is 83.8%. Transition metal catalysts are composed of Fe and MnO 2 Composite, Fe simple substance and MnO 2 The contents are 95% and 5% respectively, and the particle size is 50 mesh.

Embodiment 2

[0022] Wastewater COD7580mg / L of an organic additive factory, pH=7. Wastewater enters the three-phase reactor, and a transition metal catalyst with a mass ratio of 0.1‰ to the wastewater is added to the three-phase reactor, stirred, and compressed air with an air-water ratio of 20 is introduced at the bottom of the reactor, and the reaction time is 2 hours. After the end, add polyacrylamide with a mass ratio of 0.01‰ to wastewater, and separate mud and water in the sedimentation tank. The effluent COD is 1990mg / L, and the removal rate is 73.7%. The transition metal catalyst is composed of Fe, Mn, Cu, Ag, Ni, and Co. The contents are 60%, 15%, 10%, 5%, 5%, and 5% respectively, and the particle size is 200 mesh.

Embodiment 3

[0024] A pharmaceutical factory wastewater COD2144mg / L, pH=5. Wastewater enters the three-phase reactor, and a transition metal catalyst with a mass ratio of 0.05‰ to the wastewater is added to the three-phase reactor, stirred, and compressed air with an air-water ratio of 15 is introduced at the bottom of the reactor, and the reaction time is 1.8 hours. end with Ca(OH) 2 Adjust the pH of the effluent to 9, add polyacrylamide with a mass ratio of 0.005‰ to the wastewater, and separate the mud and water in the sedimentation tank. The COD of the effluent is 457mg / L, and the removal rate is 78.7%. Transition metal catalysts are simple substances of Fe, Cu, Ag, Ni, Co and MnO 2 Compounded, the contents are 65%, 5%, 5%, 5%, 5% and 15% respectively, and the particle size is 100 mesh.

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Abstract

The invention discloses a method for treating nondegradable organic wastewater by oxidation by using a transition metal catalyst, which comprises the following steps: regulating the pH value of wastewater to 3-7, sending the wastewater into a three-phase reactor, adding a transition metal catalyst accounting for 0.001-0.01 wt% of the wastewater, stirring, introducing compressed air as an oxidant according to the air-water ratio of 5-20, reacting for 0.5-2 hours, carrying out coagulative precipitation on the effluent water, and discharging after reaching the standard or sending into a secondary biochemical tank for treatment. The transition metal catalyst is a compound of two or more simple substances or oxides of iron, manganese, copper, silver, nickel and cobalt. The invention can be used as a direct treatment method or pretreatment method for nondegradable organic wastewater, enhances the biodegradability of the wastewater, and is beneficial to subsequent biochemical reaction. Compared with the common nondegradable organic wastewater treatment method, the invention has the advantages of milder reaction conditions, quantitative catalyst addition, lower catalyst consumption, shorter retention time, cheaper oxidant and lower treatment cost.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a method for treating refractory organic wastewater by catalytic oxidation of transition metals. Background technique [0002] With the rapid development of industrial technology, industrial wastewater containing biochemically refractory organic pollutants is increasing. This type of industrial wastewater mainly contains organic cyanides, aliphatic and halogenated aliphatic compounds, aromatic hydrocarbons and halogenated aromatic compounds containing non-halogenated functional groups, etc. It has the characteristics of high concentration of organic matter, complex components, and difficult biodegradation. Environmental pollution is very serious (Wu Xikang, organic chemical wastewater treatment technology [M], 1999). [0003] At the same time, with the deterioration of the environment, the governments of various countries pay more and more attention to environmental protect...

Claims

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Application Information

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IPC IPC(8): C02F1/74C02F9/04C02F9/14
Inventor 徐灏龙徐滔章一丹易菁
Owner 上海睿优环保工程技术有限公司
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