Catalytic wet oxidation treatment method of sludge

A technology for catalytic wet oxidation and treatment methods, applied in water/sludge/sewage treatment, chemical instruments and methods, special treatment targets, etc., to achieve the effects of clarification of separated liquid, reduction of usage, and low turbidity

Active Publication Date: 2017-06-20
彭丽 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In summary, the existing technologies generally only solve some of the technical problems faced by this field, and it is difficult to simultaneously realize multiple technologies such as "cost reduction", "efficiency improvement" and "harmless treatment (especially removal of heavy metals)" Effect

Method used

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  • Catalytic wet oxidation treatment method of sludge

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Effect test

Embodiment 1

[0040] Dewater the remaining sludge from the domestic sewage plant, control the moisture content of the sludge to 80%, and then pass it into the reaction system as the raw sludge for feeding. The organic matter content is 42%, and the daily treatment capacity is 100t.

[0041]Raw mud (dry weight 1000kg) and high temperature (75 ℃) separation liquid are mixed into the mud of moisture content 85%, inject hydrogen peroxide (27%) 500ml and catalyst A (ferrous ion 20kg) in catalyst activator as activator, Fully stir and oxidize for 40 minutes, the temperature of the mud rises to about 70°C due to oxidation, then the mud is pumped into the oxidizer, and the temperature is raised to 130°C by passing in steam. Due to the decomposition of hydrogen peroxide to produce oxygen, the instantaneous total pressure of the oxidation reactor can reach 2.5MPa, after the pressure is reduced (1.0~2.0MPa), feed oxygen and catalyst B (copper oxide 5kg), feed steam to raise the temperature to 145°C, st...

Embodiment 2

[0043] Dewater the remaining sludge from the domestic sewage plant, control the moisture content of the sludge to 75%, and then pass it into the reaction system as the raw sludge for feeding. The organic matter content is 45%, and the daily treatment capacity is 50t.

[0044] Raw mud (dry weight 1000kg) is mixed with high temperature (55°C) separation liquid to form a mud with a water content of 83%. Add ozone 20kg and catalyst A (5kg of cobalt ion) as activators in the catalyst activator, fully stir and oxidize for 20min, The mud temperature rises to about 65°C due to oxidation, and then the mud is pumped into the oxidizer, and the temperature is raised to 150°C by passing steam. Oxygen is produced due to the decomposition of ozone, and the instantaneous total pressure of the oxidation reactor can reach 2.5MPa. After the pressure drops ( 1.0~2.0MPa), feed oxygen and catalyst B (manganese oxide 80kg), feed steam to raise the temperature to 145°C, stay for 30 minutes, cool down ...

Embodiment 3

[0046] Dewater the remaining sludge from the domestic sewage plant, control the moisture content of the sludge to 70%, and then pass it into the reaction system as the raw sludge for feeding. The organic matter content is 43%, and the daily treatment capacity is 50t.

[0047] Raw mud (dry weight 1000kg) is mixed with high temperature (55°C) separation liquid to form a mud with a water content of 90%. Add ozone 300kg and catalyst A (cobalt ion 20kg) as activators to the catalyst activator, fully stir and oxidize for 30min, The temperature of the mud rises to about 65°C due to oxidation, and then the mud is pumped into the oxidizer, and the temperature is raised to 140°C by passing steam. Due to the decomposition of hydrogen peroxide to produce oxygen, the instantaneous total pressure of the oxidation reactor can reach 2.5MPa. After the pressure drops (1.0~2.0MPa), feed oxygen and catalyst B (alumina 5kg), feed steam to raise the temperature to 150°C, stay for 20min, cool down to...

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Abstract

The invention provides a catalytic wet oxidation treatment method of sludge. The method comprises the following steps: 1, dehydrating the sludge, mixing the dehydrated sludge with a separation liquid to prepare a slurry, placing the slurry in a catalyst activator, adding an advanced oxidation oxidant and a catalyst A, and carrying out a reaction at 30-150 DEG C for 20-60 min; 2, pumping a product obtained in step 1 into an oxidation device, adding a catalyst B and an oxidant C, adjusting the temperature to 130-150 DEG C, controlling the pressure to be 1.0-2.0 MPa, and carrying out a reaction for 20-120 min; and 3, carrying out heat exchange cooling treatment on a product obtained in step 2, placing the cooled product in a centrifuge, and carrying out solid-liquid separation to obtain a liquid which is the separation liquid. The method has the advantages of substantial reduction of the water content of sludge, realization of harmless treatment of the sludge, and cost reduction brought by low reaction temperature of a system and short treatment time.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to a sludge catalytic wet oxidation treatment method. Background technique [0002] At present, in the field of sludge treatment, the main methods are partial wet oxidation and catalytic oxidation. [0003] The partial wet oxidation method is developed from the wet oxidation method in the 1990s. It reduces the reaction temperature from as high as 350°C to 160-220°C, and does not completely react the organic matter, but reacts partly (15% ~35%), realize the harmlessness and stabilization of the sludge, reduce the water content to 45%, remove the heavy metals in the sludge through the generation of organic acids in the oxidation process, and realize the needs of sludge recycling through the addition of additives . However, the partial wet oxidation method has defects such as uncontrollable oxidation degree, severe blockage of pipelines and equipment caused by high sludge ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06
CPCC02F11/06C02F2303/02C02F2303/06
Inventor 彭丽胡雁龙
Owner 彭丽
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