Fenton oxidation-biological combination treatment technology capable of achieving ozone-anaerobic iron reduction and sludge reduction

A Fenton oxidation and sludge reduction technology, which is applied in anaerobic digestion treatment, biological sludge treatment, special compound water treatment, etc., can solve the problems of high iron sludge production, high disposal cost, and high acid and alkali dosing cost , to achieve the effect of saving project operating costs, reducing operating costs, and reducing emissions

Inactive Publication Date: 2016-03-23
DONGHUA UNIV
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Problems solved by technology

However, the main problem of Fenton oxidation is that the pH of the wastewater needs to be adjusted to 3.0-4.0 before the reaction. After the reaction is completed and the coagulation stage is entered, the pH of the wastewater needs to be adjusted to 7-8 with alkali. Not only the cost of adding acid and alkali is high, but also A large amount of iron sludge is produced, and the production and disposal costs of iron sludge are high

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  • Fenton oxidation-biological combination treatment technology capable of achieving ozone-anaerobic iron reduction and sludge reduction

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Embodiment 1

[0019] A printing and dyeing enterprise in Zhejiang, the wastewater discharged includes printing, dyeing, scouring, and desizing wastewater. The mixed wastewater COD=3000-4000mg / L, after treatment, it needs to meet the discharge standard of COD≤200mg / L and discharge it into the sewage of the industrial park Pipe Network. Adopt the Fenton oxidation-biological combination treatment process of ozone-anaerobic iron reduction combined with sludge reduction proposed by the present invention, the specific method and steps are: (1) The biochemical effluent of printing and dyeing wastewater enters Fenton oxidation-hydrolytic acidification-aerobic After treatment, the effluent COD≤200mg / L; (2) Feed the iron-containing sludge and biological treatment residual sludge produced by the Fenton oxidation unit into the ozone reaction tank at a ratio of 3:1, and react for 20 minutes; (3 ) and then enter the anaerobic iron reduction reactor, after 24 hours of reaction, more than 90% of the Fe in ...

Embodiment 2

[0021] An environmental protection service center in Tianjin collected wastewater from offshore oil production platforms with a COD of 25,000-30,000 mg / L. The wastewater contains a lot of organic suspended matter, which is difficult to remove by traditional flocculation and sedimentation, thus reducing the scaling and effectiveness of subsequent evaporation devices. After the wastewater is treated by Fenton oxidation-anaerobic-aerobic process, the water quality is relatively clear, which can meet the subsequent evaporation requirements; however, a large amount of iron-containing sludge and residual sludge are produced in the process of Fenton oxidation and biological treatment, which is difficult and expensive to dispose of higher. Adopt the Fenton oxidation-biological combination treatment process of ozone-anaerobic iron reduction combined with sludge reduction proposed by the present invention, the specific method and steps are: (1) the wastewater from the oil production plat...

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Abstract

The invention discloses a Fenton oxidation-biological combination treatment technology capable of achieving ozone-anaerobic iron reduction and sludge reduction. The technology comprises the processes that after iron-containing sludge generated in Fenton oxidation is mixed with retained partial biological treatment sludge discharged by a secondary sedimentation tank, the mixed sludge firstly enters an ozone reaction tank, refractory organics in the iron-containing sludge are initially decomposed into micromolecular easily-degraded organics, lysis and wall breaking are performed on microbial cells of the retained biological treatment sludge, and then the mixed sludge enters an anaerobic iron reduction reactor; the degradability of organic components in the sludge is further improved in the anaerobic iron reduction reactor, and meanwhile the process of converting Fe<3+> in the Fenton iron-containing sludge into Fe<2+> is achieved under the action of an anaerobic iron reducing bacterium; a Fe<2+>-containing solid-liquid product generated through a reaction is completely reused in the front step of a Fenton oxidation technology to partially replace Fe<2+> put in the Fenton oxidation technology, and meanwhile system sludge reduction is achieved to save engineering investment and operating cost.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment and sludge resource utilization, and in particular relates to a Fenton oxidation-biological combination treatment process for sludge reduction using ozone-anaerobic iron reduction. Background technique [0002] Fenton oxidation is a technology that has been applied in the field of refractory industrial wastewater treatment in recent years. Its technical advantage lies in the 2+ Catalyzes H under acidic conditions 2 o 2 Generate highly oxidizing hydroxyl radicals, thereby degrading organic matter in wastewater. Fenton oxidation is used as the pretreatment of refractory industrial wastewater. While removing a large amount of organic matter, it can open the ring and break the chain of some refractory organic matter, effectively improving its biodegradability. Therefore, Fenton oxidation is often used as a pretreatment in wastewater treatment to improve its biodegradability, and then ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F11/04C02F11/06
CPCC02F1/52C02F1/722C02F3/02C02F3/28C02F9/00C02F11/04C02F11/06C02F2301/043C02F2301/046C02F2305/026
Inventor 薛罡李响高品刘振鸿刘亚男张凡张文娟王成薛顺利韩闯魏欣孟迪顾超超辛海霞陈畅愉成钰莹来思周甘雁飞徐小强杨帆程茜程文艳张婷
Owner DONGHUA UNIV
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