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Method of reducing sludge of petrochemical wastewater by aerating combination of ozone and pure oxygen

A technology of pure oxygen aeration and petrochemical wastewater, which is applied in the field of environmental engineering, can solve the problems of high energy consumption, high inorganic salt content, high sludge yield, etc., to reduce energy consumption and operation costs, improve treatment efficiency, and reduce residual sewage. The effect of reducing the amount of mud

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The research on the ozone oxidation sludge reduction technology has just started in my country, and the influence of sludge concentration and ozone amount on the sludge reduction effect and the mechanism of the ozone oxidation process have not been reported.
[0004] The excess sludge produced by sewage treatment in the petrochemical industry has complex chemical components, high inorganic salt content, high sludge yield, large excess sludge output, and high energy consumption for treatment. Sludge treatment brings heavy pressure to sewage plants

Method used

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  • Method of reducing sludge of petrochemical wastewater by aerating combination of ozone and pure oxygen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: When the test pure oxygen aeration tank is operating at full capacity, the remaining sludge is oxidized by ozone.

[0025] 1. Pump the sewage into the pure oxygen aeration tank with an effective volume of 1000L, and inject pure oxygen into the tank for aeration; the pure oxygen aeration tank is controlled to operate at full load, and the corresponding HRT is 12h.

[0026] 2. The sewage after pure oxygen aeration is pumped into the conical sedimentation tank for 1.0h, and then filtered to complete the solid-liquid separation. 50% of the separated sludge is used as return sludge, and the remaining 50% is used as ozonated sludge;

[0027] 3. Then pump the return sludge separated from the conical sedimentation tank to the pure oxygen aeration tank with an effective volume of 1000L as described in step 1. The return sludge concentration is 16g / L, and the water volume in the tank is maintained. At 900L, keep the oxygen pipe valve open at the same time for aeration....

Embodiment 2

[0029] Example 2: When the pure oxygen aeration tank is running at half load, the remaining sludge is oxidized by ozone.

[0030] 1. Pump the sewage into the pure oxygen aeration tank with an effective volume of 1000L, and inject pure oxygen into the tank for aeration. The pure oxygen aeration tank is controlled to operate at half load, and the corresponding HRT is 24h.

[0031] 2. The sewage after pure oxygen aeration is pumped into the conical sedimentation tank to settle for 2 hours, and then filtered to complete the solid-liquid separation, 60% of the separated sludge is used as return sludge, and the remaining 40% is used as ozonated sludge;

[0032] 3. Then pump the return sludge separated from the conical sedimentation tank to the pure oxygen aeration tank with an effective volume of 1000L as described in step 1. The return sludge concentration is 18g / L, and the water volume in the tank is maintained. At 920L, keep the oxygen pipe valve open at the same time for aeratio...

Embodiment 3

[0034] Example 3: When the pure oxygen aeration tank is running at half load, the remaining sludge is oxidized by ozone.

[0035] 1. Pump the sewage into the pure oxygen aeration tank with an effective volume of 1000L, and inject pure oxygen into the tank for aeration. The pure oxygen aeration tank is controlled to operate at half load, and the corresponding HRT is 24h.

[0036] 2. The sewage after pure oxygen aeration is pumped into the conical sedimentation tank for sedimentation for 2 hours, and then filtered to complete solid-liquid separation. 55% of the separated sludge is used as return sludge, and the remaining 45% is used as ozonated sludge;

[0037] 3. Then pump the return sludge separated from the conical sedimentation tank to the pure oxygen aeration tank with an effective volume of 1000L as described in step 1. The return sludge concentration is 16g / L, and the water volume in the tank is maintained. At 900L, keep the oxygen pipe valve open at the same time for aer...

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Abstract

The invention relates to a method of reducing sludge of petrochemical wastewater by aerating combination of ozone and pure oxygen, belonging to the technical field of environmental engineering. Aiming at the characteristics of petrochemical wastewater, sludge of petrochemical wastewater is reduced by controlling ozone oxidization and pure oxygen aeration by adopting a special process condition. Ozone oxidization treatment is carried out according to 40-50% of a theoretical output of residual sludge, and the oxidization time is controlled within 28-35 minutes, so that the field sludge reduction efficiency is controlled within 72.7-81.5%. Meanwhile, COD (Chemical Oxygen Demand) of effluent reaches the standard, so that the sludge is reduced, while the method is high in treatment efficiency, low in energy consumption and low in operating cost.

Description

technical field [0001] The invention relates to a method for reducing petrochemical wastewater sludge by combining ozone and pure oxygen aeration, and belongs to the technical field of environmental engineering. Background technique [0002] At present, only one ethylene plant of a petrochemical enterprise treats sewage, and the aeration tank in the high-salt system produces nearly 1,000 tons of residual dry sludge per year. The traditional gravity concentration and chemical conditioning are used to form filter cakes through dehydration machines, and the filter cakes are incinerated. The cost per ton of sludge chemicals plus follow-up treatment is about 820 yuan, and the annual cost of this sludge treatment alone is more than 700,000 yuan. The sludge in the petrochemical industry has a high water content, and the cost of chemical conditioning is high, and the treatment cost is expensive. With the increasingly stringent environmental standards and the increasing amount of re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06
Inventor 万才元谭克锋马建录李中法张明良郝格格
Owner CHINA PETROLEUM & CHEM CORP
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