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A wastewater Fenton oxidation-biological combination treatment method and device for sludge recycling

A Fenton oxidation and sludge recycling technology, applied in water/sludge/sewage treatment, water/sewage treatment, anaerobic digestion treatment, etc. Advanced problems, to achieve the effect of saving project operating costs, reducing operating costs, and reducing emissions

Active Publication Date: 2018-02-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • A wastewater Fenton oxidation-biological combination treatment method and device for sludge recycling
  • A wastewater Fenton oxidation-biological combination treatment method and device for sludge recycling

Examples

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Embodiment 1

[0034] A printing and dyeing enterprise discharges wastewater including 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 pipe of the industrial park network. The Fenton oxidation-biological combination treatment process proposed in this example is used for sludge recycling. The specific methods and steps are: (1) The biochemical effluent of printing and dyeing wastewater enters Fenton oxidation-hydrolytic acidification-aerobic treatment, and the effluent after treatment COD≤200mg / L; (2) Feed the iron-containing sludge produced by the Fenton oxidation unit and the residual sludge from biological treatment into the wet thermal catalytic-carbonization reactor at a ratio of 3:1; (3) Closed wet thermal Catalytic reactor, react at 200°C for 5 hours, carbonize the organic matter in the sludge, and remove the Fe in the sludge 3+ reduced ...

Embodiment 2

[0038] In an environmental protection service center, the COD of wastewater collected from offshore oil production platforms is 25000-30000mg / L. There are many organic suspended solids in the wastewater, which are 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. The Fenton oxidation-biological treatment combined process of sludge recycling proposed in this example is used for treatment. The specific methods and steps are: (1) the wastewater from the oil production platform enters Fenton oxidation-hydrolytic acidifica...

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Abstract

The invention relates to a wastewater Fenton oxidation-biological combined treatment method and device capable of recycling sludge. The method comprises the following steps: treating industrial wastewater by a Fenton oxidation-biological combined process; adding iron-containing sludge generated by Fenton oxidation and surplus sludge discharged by concentration biological treatment into a wet-type hot catalytic carbonization-reduction reaction kettle, sealing, heating to 200-250 DEG C, stirring to react for 5.0-6.0 hours to obtain a solid / liquid two-phase mixture, discharging, adding to a water inlet of a Fenton oxidation reactor, mixing with wastewater, acid and H2O2, and sending into the reactor to start the Fenton oxidation-biological treatment combined treatment; and after the treatment is finished, recycling the sludge. The method can implement reduced discharge of iron sludge and biological treatment surplus sludge, saves the continuously added external Fe<2+> in the Fenton oxidation unit, and has great advantages in the aspect of saving wastewater treatment cost and sludge disposal cost.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment and sludge resource utilization, and in particular relates to a wastewater Fenton oxidation-biological combination treatment method for sludge recycling and a device thereof. 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 t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/10C02F1/72C02F1/52C02F3/28C02F3/06C02F1/66
CPCC02F1/52C02F1/66C02F1/722C02F3/06C02F3/28C02F9/00C02F11/10C02F2209/02C02F2209/03C02F2209/06C02F2303/06C02F2305/026Y02W10/10
Inventor 薛罡张文启张禾高品李响陈红刘振鸿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
Owner DONGHUA UNIV