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A kind of activated sludge treatment method of saline wastewater

A technology for activated sludge and salty wastewater, applied in the field of activated sludge treatment, can solve the problems of energy consumption and waste of air aeration, and achieve the effects of low operating cost, promoting efficiency and enhancing mass transfer performance.

Active Publication Date: 2019-01-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This will inevitably lead to waste of energy consumption for air aeration

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  • A kind of activated sludge treatment method of saline wastewater
  • A kind of activated sludge treatment method of saline wastewater

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Experimental program
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Effect test

Embodiment 1

[0053] Activated sludge treatment (comprising anoxic treatment and aerobic treatment) is carried out to saline waste water 1, and the method for described treatment is according to " " water pollution control project " page 342-344: water pollution control project, edited by Wang Yu, Lin Fengkai Associate Editor, Chemical Industry Press, 2008". The difference is that a cyclone is set on the return line from aerobic to anaerobic, the flow rate of the cyclone inlet is 4-6m / s, the feed pressure is 0.10-0.15MPa, the inlet and outlet The pressure difference of the cyclone is 0.10-0.15MPa, the flow rate of the overflow port of the cyclone is 3.5 volume% of the inlet flow rate, and the velocity gradient of the mixed material (reflux liquid) from the aerobic treatment in the cyclone is 4000S -1 . The particle size of 80% by weight of activated sludge flocs after cyclone is 0.5-1mm, and the particle diameter of all activated sludge flocs is not more than 2mm. The processing results a...

Embodiment 2

[0055] Activated sludge treatment (including anoxic treatment and aerobic treatment) is performed on the saline wastewater 2 . The treatment method is carried out according to ""Water Pollution Control Engineering" pages 342-344: Water Pollution Control Engineering, editor-in-chief Wang Yu, deputy editor-in-chief Lin Fengkai, Chemical Industry Press, 2008". The difference is that a cyclone is set on the return line from aerobic to anaerobic, the flow rate of the cyclone inlet is 1-4m / s, the feed pressure is 0.03-0.06MPa, the inlet and outlet The pressure difference of the cyclone is 0.06MPa, the flow rate of the overflow port of the cyclone is 2% by volume of the inlet flow rate, and the velocity gradient of the mixed material (reflux liquid) from the aerobic treatment in the cyclone is 2800S -1 . The particle size of 60% by weight of activated sludge flocs after cyclone is 0.5-1mm, and the particle diameter of all activated sludge flocs is not more than 2mm. The processing ...

Embodiment 3

[0057] Activated sludge treatment (including anoxic treatment and aerobic treatment) is performed on the saline wastewater 3 . The treatment method is carried out according to ""Water Pollution Control Engineering" pages 342-344: Water Pollution Control Engineering, editor-in-chief Wang Yu, deputy editor-in-chief Lin Fengkai, Chemical Industry Press, 2008". The difference is that a cyclone is set on the return line from aerobic to anaerobic, the flow rate of the cyclone inlet is 6-8m / s, the feed pressure is 0.08-0.10MPa, the inlet and outlet The pressure difference of the cyclone is 0.10MPa, the flow rate of the overflow port of the cyclone is 5% by volume of the inlet flow rate, and the velocity gradient of the mixed material from the aerobic treatment in the cyclone is 5600S -1 . The particle size of 90% by weight of activated sludge flocs after cyclone is 0.5-1mm, and the particle diameter of all activated sludge flocs is not more than 2mm. The processing results are show...

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Abstract

The invention discloses a method utilizing active sludge to process salt containing wastewater. The method comprises the following steps: (1) under an anoxic condition, contacting salt containing wastewater with a material containing active sludge to carry out an anoxic treatment on salt containing wastewater; (2) after contacting, subjecting the obtained mixture to an aerobic treatment; (3) after the aerobic treatment, returning part of the mixture to step (1) as part of the material containing active sludge; wherein the part that is returned to the step (1) accounts for at least 60 wt% of the total weight of mixture, which has been processed by the aerobic treatment, and the particle size of active sludge is not larger than 1 mm. The provided method can promote the degradation and nitration efficiency of organic substances, which are difficult to degrade, in salt containing wastewater on the basis that no medicament is added and the aeration of O tank is not enhanced, and has the advantages of low operation cost and no by product.

Description

technical field [0001] The invention relates to an activated sludge treatment method for saline wastewater. Background technique [0002] The existing relatively mature saline wastewater treatment technology generally adopts a combined treatment process of single-stage or two-stage air flotation and activated sludge. The A / O (anoxic / aerobic) process has always been the preferred process for the biological treatment of saline wastewater due to its advantages of stable operation, simple operation and maintenance, and effective denitrification. [0003] Taking the saline wastewater from an oil refinery as an example, the content of petroleum substances is as high as 500mg / L or above. After multi-unit oil removal pretreatment, the raw water entering the A / O process still contains a certain amount of colloidal dispersed oil and emulsified oil. As a result, these tiny oil droplets will be adsorbed and coated on the activated sludge flocs. On the one hand, the mass transfer of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 汪华林陈秀荣刘毅杨雪晶黄朝晖高根煜江萍
Owner CHINA PETROLEUM & CHEM CORP