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Low-cost treatment method and device for petrochemical waste lye

A treatment method and technology of waste lye, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of hindering the formation of electric field, increasing power consumption, and losing catalytic effect of catalyst particles and other problems, to achieve the effect of significant economic benefits and low energy consumption

Active Publication Date: 2018-07-03
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The disadvantages of this patent are: first, the electrolytic catalytic oxidation using solid catalysts, the catalyst particles are easily blocked by organic matter or calcium scale in the wastewater and lose their catalytic effect, and at the same time, the catalyst particles accumulate between the anode and cathode, which will hinder the formation of the electric field , so that the voltage between the plates increases to increase power consumption; second, this method can only treat low-salt concentration wastewater
Because electrolytic catalytic oxidation cannot effectively reduce the salt content in wastewater, if it is used to treat high-salt wastewater, activated sludge (biochemical method) cannot be used to continue the treatment in the later stage

Method used

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  • Low-cost treatment method and device for petrochemical waste lye

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Effect test

Embodiment 1

[0027] A refinery waste lye: water volume 50m 3 / h,S 2- It is 15000mg / L, the conductivity is 30000μs / cm, and the COD is 5500mg / L.

[0028] Devices for low-cost treatment of petrochemical waste lye: such as figure 1 As shown, it includes an electrolytic catalytic oxidation reactor, a biochemical reactor 8, and a sedimentation tank 15 connected in sequence. The electrolytic catalytic oxidation reactor includes a DC power supply 1, an electrolytic cell 3, and the front end of the electrolytic cell 3 is provided with a water inlet pipe 2, and the rear end is passed through electrolysis. The connecting pipe 7 between the tank and the biochemical reactor is communicated with the biochemical reactor 8, and the rear end of the biochemical reactor 8 is communicated with the sedimentation tank 13 through the connecting pipe 12 between the biochemical reactor and the sedimentation tank. The connecting pipe 7 is provided with a low-salt sewage water distribution pipe 6, the rear end of ...

Embodiment 2

[0032] The device of the low-cost treatment method for petrochemical waste lye used in Example 2 is the same as that in Example 1.

[0033] Waste lye from an olefin factory: water volume 2m 3 / h,S 2- It is 70000mg / L, the conductivity is 140000μs / cm, and the COD is 81600mg / L.

[0034] Treatment process: the waste lye to be treated enters the electrolytic cell 3 through the water inlet pipe 2, turns on the DC power supply 1, and adjusts the output current so that the current density between the alkali-resistant anode 4 and the stainless steel cathode 5 is 100mA / cm 2 , the distance between the alkali-resistant anode 4 and the stainless steel cathode 5 is 3 cm, and the electrolytic oxidation reaction time is 180 minutes. 3 / h of low-salt sewage (conductivity 2100μs / cm, COD is 545mg / L) also enters the biochemical reactor 8 through the connecting pipe 7 between the electrolytic cell 3 and the biochemical reactor 8 through the low-salt sewage water distribution pipe 6 to keep the b...

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Abstract

The invention belongs to the field of wastewater treatment, and in particular relates to a low-cost treatment method and device for petrochemical waste lye. The method of the present invention is to use electrolytic catalytic oxidation and biochemical combination process to treat petrochemical waste lye. Firstly, electrolytic catalytic oxidation oxidizes the sulfide in the waste lye to sulfate, and eliminates the foul smell in the waste water and the toxicity to microorganisms. Then mix part of the low-salt sewage for biochemical treatment, treat the organic matter in the wastewater to a certain level and then discharge it up to the standard. The invention utilizes the alkali-resistant electrode to electrolytically oxidize the sulfide in the waste caustic soda to sulfate radical or sodium thiosulfate to eliminate the foul smell and the poisonous substances to microorganisms in the waste water, and then mixes it into the low-salt sewage for biochemical treatment. The invention does not need to add an oxidant and operates under normal temperature and pressure, has the characteristics of low energy consumption and remarkable economic benefits.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a low-cost treatment method and device for petrochemical waste lye. Background technique [0002] In the petrochemical production process, NaOH solution is often used to absorb H 2 S. Alkaline washing oil and pyrolysis gas produce waste lye containing a large amount of pollutants. The wastewater is characterized by biochemical oxygen demand COD as high as tens of thousands to hundreds of thousands of milligrams per liter, and contains high concentrations of sulfides, phenols, petroleum and other toxic and harmful pollutants, and its pH is above 12. Due to the inorganic and organic sulfides such as sulfides and mercaptans, the spent lye has an unpleasant stench. Spent lye is strongly alkaline and contains high concentrations of sulfide and organic matter. Without proper pretreatment, high-concentration waste lye will inhibit the growth and reproduction of microorg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 邹宗海潘咸峰李波刘婷婷
Owner CHINA PETROLEUM & CHEM CORP
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