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An iron-carbon reduction-biological combined treatment method and device for iron circulation and sludge reduction

A sludge reduction and treatment device technology, which is applied in the direction of electrochemical biological combination treatment, sludge treatment, biological water/sewage treatment, etc., can solve the problems of high cost of acid and alkali addition, high iron sludge production and high disposal cost , to achieve the effect of saving sludge disposal fees, saving wastewater treatment costs, and saving project operating costs

Active Publication Date: 2018-04-06
DONGHUA UNIV
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  • Application Information

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Problems solved by technology

However, the main problem in the engineering application of iron-carbon reduction is that the pH of the wastewater needs to be adjusted to 3.0-4.0 during the reaction to facilitate the corrosion of zero-valent iron. After the reaction is completed and enters the coagulation stage, the wastewater pH needs to be adjusted to 7-8 with alkali As a result, a large amount of iron sludge is produced, not only the cost of adding acid and alkali is high, but also the amount of iron sludge produced and the cost of disposal are high

Method used

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  • An iron-carbon reduction-biological combined treatment method and device for iron circulation and sludge reduction
  • An iron-carbon reduction-biological combined treatment method and device for iron circulation and sludge reduction

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Embodiment 1

[0035] 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 iron-carbon reduction-biological combination treatment process of iron circulation and sludge reduction proposed in this embodiment is adopted. The specific methods and steps are: (1) the biochemical effluent of printing and dyeing wastewater enters iron-carbon reduction-hydrolytic acidification-aerobic treatment, and the treatment The final effluent COD≤200mg / L; (2) Feed the iron-containing sludge produced by the iron-carbon reduction unit and the residual sludge from biological treatment into the thermal catalytic carbonization-reduction reactor at a ratio of 3:1; (3) Seal The thermal catalytic carbonization-reduction reactor reacts at 185°C for 7.0 hours to carbonize t...

Embodiment 2

[0039] 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. The wastewater is treated with iron-carbon reduction-anaerobic-aerobic process, and the water quality is relatively clear, which can meet the water intake of the subsequent evaporation device; however, a large amount of iron-containing sludge and residual sludge are produced during the iron-carbon reduction and biological treatment process, which is difficult to dispose of and higher costs. The iron-carbon reduction-biological treatment combined process of iron circulation and sludge reduction proposed in this embodiment is used for treatment. The specific methods and steps are: (1) the wastewater from the oil production pla...

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Abstract

The invention relates to an iron-carbon reduction-bio-combination treatment method with iron cycling and sludge reduction functions and a device thereof. The method includes the steps that industrial waste water is treated through an iron-carbon reduction-bio-combination treatment technology; iron-containing sludge generated by iron-carbon reduction and remaining sludge obtained through bio-combination technology treatment are added into a thermocatalytic carbonization-reduction reactor by the mass ratio of 1:1-3:1, the reactor is closed and heated to 180-200 DEG C, the mixed sludge is stirred to react for 5-7 h to obtain a solid-liquid mixture, the solid-liquid mixture is discharged, put into a water inlet of an iron-carbon reduction reactor and mixed with the waste water and acid and then enters the iron-carbon reduction reactor, the sludge generated by the reaction is used circularly. Reduction emission of the iron-containing sludge in the iron-carbon reduction-biotreatment combined technology and the remaining sludge obtained through biological treatment is achieved, the step of continuously adding zero-valent iron power and activated carbon powder from an external source in an iron-carbon reduction unit is omitted, and the method has great advantages 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 an iron-carbon reduction-biological combination treatment method for iron circulation and sludge reduction and a device thereof. Background technique [0002] Iron-carbon reduction is a technology that has been applied in the field of refractory industrial wastewater treatment in recent years. Its technical advantage lies in the fact that zero-valent iron and carbon form a micro-electrolysis primary battery, and the new ecological [H] produced has a strong reduction effect, which can Reducing, ring-opening and chain-breaking of refractory organic matter can effectively improve its biodegradability. Therefore, iron-carbon reduction is often used as a pretreatment in industrial wastewater treatment to improve its biodegradability, and then anaerobic-aerobic biological treatment process is used to obtain a good orga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F11/00C02F11/10
CPCC02F1/705C02F3/005C02F3/301C02F9/00C02F11/00C02F11/10C02F2301/046C02F2303/06
Inventor 薛罡张文启张禾高品李响陈红张凡张文娟王成薛顺利韩闯魏欣孟迪顾超超陈畅愉成钰莹来思周甘雁飞徐小强杨帆
Owner DONGHUA UNIV
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