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Ozone-anaerobic iron reduction combined Fenton oxidation technology for sludge reduction

A Fenton oxidation and sludge reduction technology, which is applied in the oxidation treatment of sludge, sludge treatment, biological sludge treatment, etc., can solve the problems of large iron sludge discharge, high disposal cost, and large salt consumption. Achieve the effect of reducing emissions, saving project operating costs, and reducing process operating costs

Inactive Publication Date: 2016-03-02
DONGHUA UNIV
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Problems solved by technology

[0004] What the present invention aims to solve is that in the traditional wastewater Fenton oxidation process, the amount of iron sludge discharge is large, the disposal cost is high, and Fe 2+ The problem of large amount of salt usage and high cost

Method used

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  • Ozone-anaerobic iron reduction combined Fenton oxidation technology for sludge reduction

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Embodiment 1

[0017] A printing and dyeing enterprise in Zhejiang, the wastewater discharged includes printing, dyeing, scouring, and desizing wastewater. The mixed wastewater COD=1000-2000mg / 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. Adopting the Fenton oxidation 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 treatment, and The final effluent COD≤200mg / L; (2) add part of the iron-containing sludge produced by the Fenton oxidation unit to the ozone reaction tank, and react for 20 minutes; (3) then enter the anaerobic iron reduction reactor, and react for 24 hours. More than 90% Fe in the sludge 3+ converted to Fe 2+ (4) finally the Fe in the anaerobic iron reduction ...

Embodiment 2

[0019] A fluorine chemical company in Jiangsu province discharged wastewater with COD=10000-20000 mg / L, and there were many organic suspended solids in the wastewater, which were difficult to remove by traditional flocculation and sedimentation, which resulted in fouling and reduced effectiveness of subsequent evaporation devices. After the wastewater is treated with Fenton oxygen, 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 during the Fenton oxidation process, and the disposal is difficult and expensive. Adopt the Fenton oxidation process that ozone-anaerobic iron reduction combined with sludge reduction that the present invention proposes, concrete method and step are: (1) waste water enters Fenton oxidation process treatment; (2) Fenton oxidation unit produces Part of the iron-containing sludge is added to the ozone oxidation reactor and react...

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Abstract

The invention discloses an ozone-anaerobic iron reduction combined Fenton oxidation technology for sludge reduction. The technology comprises the following steps: part of iron-containing sludge produced by Fenton oxidation firstly undergoes ozone oxidation treatment so as to preliminarily decompose refractory organic matter in the iron-containing sludge into small molecular easily biodegradable organic matter; then, the small molecular easily biodegradable organic matter enters an anaerobic iron reduction reactor; degradability of organic components in the sludge is further improved in the anaerobic iron reduction reactor, and simultaneously under the action of anaerobic iron-reducing bacteria, the process of converting Fe<3+> in the Fenton iron-containing sludge to Fe<2+> is completed; and finally, solid-liquid products containing Fe<2+> after the reaction all return to the front end of the Fenton oxidation process so as to partially replace Fe<2+> added in the Fenton oxidation process. Sludge reduction of the system is realized, so as to save construction 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 process for sludge reduction combined with ozone-anaerobic iron reduction. Background technique [0002] The Fenton oxidation process has the unique advantages of high oxidation-reduction potential of hydroxyl radicals produced by it and basically non-selective oxidation of refractory organic matter. It has been applied to the pretreatment and advanced treatment of refractory industrial wastewater. However, the main problem with Fenton's reagent is that the pH of the wastewater needs to be adjusted to 3.0-4.0 before the reaction, and the pH of the wastewater needs to be adjusted to 7-8 with alkali when the reaction is completed and enters the coagulation stage. The additional cost is high, and the iron sludge production and disposal costs are high. [0003] Therefore, it is assumed that if the Fe in the...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F11/06C02F11/02
Inventor 李响薛罡高品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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