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Method and apparatus for removing sulfate in high-salt petrochemical wastewater

A technology for petrochemical sewage and sulfate radicals, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of no industrial application examples, single ingredients, long inoculation and acclimation period, etc. , to achieve the effect of improving stability, improving removal rate and reducing scaling tendency

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

SO 4 2- The removal efficiency is high, but the COD used in this experiment all comes from edible brown sugar, the composition is single, the inoculation and acclimation period is long, and there is no example of industrial application

Method used

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  • Method and apparatus for removing sulfate in high-salt petrochemical wastewater

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The residual sludge with a solid content of 3.2% produced by the high-salinity petrochemical sewage biochemical treatment system was treated by a double-headed ultrasonic processor. 40% of the remaining sludge enters the ultrasonic processor, the frequency of the remaining sludge is 20-30kHz, and the sound intensity is 20W / cm 2 After ultrasonic treatment for 5 minutes, the obtained sludge was mixed with high-salt petrochemical sewage to make the COD / SO in high-salt petrochemical sewage 4 2- =1.5, and then return to the anoxic pool of the sewage treatment system. The dissolved oxygen in the anoxic pool is controlled at 0.5mg / L, the pH value is 6.5-8.5, the water temperature is 25-35°C, the reflux ratio is 200%, and the residence time is maintained at 8.6h. The initial concentration of sulfate in high-salinity petrochemical wastewater was 556 mg / L. After anoxic treatment, the concentration of sulfate in the effluent was reduced to 221 mg / L, and the removal rate of sulfa...

Embodiment 2

[0037] The residual sludge with a solid content of 3.2% produced by the high-salinity petrochemical sewage biochemical treatment system was treated by a double-headed ultrasonic processor. 40% of the remaining sludge enters the ultrasonic processor, the frequency of the remaining sludge is 20-30kHz, and the sound intensity is 20W / cm 2 After 5 minutes of ultrasonic treatment, the obtained sludge supernatant was mixed with high-salt petrochemical sewage to make the COD / SO in high-salt and refractory sewage 4 2- =1.5, and then return to the anaerobic tank of the sewage treatment system. The dissolved oxygen in the anaerobic tank is controlled at 0.2mg / L, the pH value is 6.5-8.5, the water temperature is 25-35°C, the reflux ratio is 200%, and the residence time is maintained at 8.6h. The initial concentration of sulfate radicals in high-salt petrochemical wastewater was 583 mg / L. After anaerobic treatment, the sulfate radical concentration in the effluent was reduced to 215 mg / L...

Embodiment 3

[0040] The residual sludge with a solid content of 3.8% produced by the high-salinity petrochemical sewage biochemical treatment system was treated by a double-headed ultrasonic processor. 60% of the remaining sludge enters the ultrasonic processor, the frequency of the remaining sludge is 20-30kHz, and the sound intensity is 25W / cm 2 After 8 minutes of ultrasonic treatment, the obtained sludge was mixed with high-salt petrochemical sewage to make the COD / SO in high-salt petrochemical sewage 4 2- =2.0, and then return to the anoxic pool of the sewage treatment system. The dissolved oxygen in the anoxic pool is controlled at 0.5mg / L, the pH value is 6.5-8.5, the water temperature is 25-35°C, the reflux ratio is 300%, and the residence time is maintained at 8.6h. The initial concentration of sulfate in high-salinity petrochemical wastewater was 776mg / L. After anoxic treatment, the concentration of sulfate in the effluent was reduced to 186mg / L, and the removal rate of sulfate ...

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Abstract

The invention relates to a removing method and a removing apparatus for sulfate in high-salt petrochemical wastewater, and belongs to the technical field of wastewater treatment. According to the present invention, in order to provide a method with characteristics of low cost, simpleness, convenience and high sulfate removal rate, and an apparatus thereof, according to the principle of conversion of sulfate into hydrogen sulfide with sulfate reducing bacteria, residual sludge produced by a high-salt petrochemical wastewater treatment system precipitation tank is subjected to ultrasonic wave degradation through an ultrasonic wave treatment, the obtained sludge or sludge supernatant and high-salt petrochemical wastewater are mixed, and then enter an anoxic tank or anaerobic tank so as to provide a carbon source for the sulfate reducing bacteria, and a blowing removing manner under a N2 solution is adopted to remove the hydrogen sulfide so as to reduce inhibition effects of hydrogen sulfide and other sulfides on the sulfate reducing bacteria; and the sulfate reduction can be effectively promoted, the sulfate removal rate can be increased, the calcium sulfate scaling tendency can be reduced, the maintenance period and the service life of the equipment can be prolonged, and the system stability is increased.

Description

technical field [0001] The invention relates to a method and device for removing sulfate radicals in high-salt petrochemical sewage, in particular to a method for removing sulfate radicals using ultrasonically treated excess sludge or sludge supernatant as a supplementary carbon source, which belongs to wastewater treatment technology field. Background technique [0002] Biochemical treatment is a treatment process commonly used in sewage treatment. For high-salt petrochemical sewage containing high concentrations of calcium ions and sulfate radicals, the calcium ions and sulfate radicals are easily combined during the treatment process to form hard calcium sulfate scales that are difficult to remove, which are deposited in biochemical treatment facilities, fillers or The surface of the filter material will affect the treatment effect of the biochemical system. In severe cases, it is necessary to stop the machine to replace the packing or filter material. To prevent the fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F3/34C02F3/30
Inventor 张方银王建娜潘咸峰李茂双孙蕴
Owner CHINA PETROLEUM & CHEM CORP
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