Method for inhibiting expansion of anaerobic active sludge

A technology of sludge bulking and oxygen activity, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage multi-stage treatment, etc. Control bacterial growth and reproduction and other problems to achieve the effect of inhibiting bacterial growth

Inactive Publication Date: 2012-10-17
CHANGZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is also possible to destroy the growth of bacteria by adding hydrogen peroxide and ozone. This method can generally reduce the SVI value quickly, but it does not fundamentally control th

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, take 10g of ferrous sulfate, 20g of copper nitrate, 20g of molybdenum nitrate, and 20g of sodium chloride and add them to the water and stir them. After 20 minutes, add 20g of kaolin and 10g of calcium carbonate to the water. Finally, adjust the pH value of the water. From 6.5 to 6.5, carry out oxygen-enriched aeration under normal temperature conditions, and the aeration time is 2 hours. The anaerobic activated sludge swelling phenomenon of 80ppm of wastewater in a certain area was taken for treatment. After the treatment, the detected SVI value dropped from 250ml / g to 50ml / g, the sludge changed from floating to sedimentation, and the swelling phenomenon gradually disappeared.

Embodiment 2

[0025] First, take 5g of ferrous sulfate, 10g of copper nitrate, 15g of molybdenum nitrate, 20g of sodium chloride, 20g of potassium sulfide, and 10g of lithium bromide and add them to the water. After waiting for 30 minutes, add 10g of kaolin and 10g of calcium hydroxide to the water. Finally, Adjust the pH value of the water to 7.5, and carry out oxygen-enriched aeration under normal temperature conditions, and the aeration time is 3 hours. The anaerobic activated sludge swelling phenomenon of 100ppm wastewater in a certain area was treated. After the treatment, the detected SVI value dropped from the original 300ml / g to 40ml / g, the sludge changed from floating to sedimentation state, and the swelling phenomenon disappeared.

Embodiment 3

[0027] First, take 5g of ferrous sulfate, 10g of copper nitrate, 5g of molybdenum nitrate, 5g of cobalt nitrate, 10g of sodium chloride, 5g of potassium sulfide, 5g of lithium bromide, 5g of zinc chloride, 10g of silver bromide, and 10g of manganese sulfate into water, etc. After 30 minutes, add 10g of kaolin, 10g of calcium hydroxide and 10g of calcium carbonate to the water. Finally, adjust the pH value of the water to 8.5, and carry out oxygen-enriched aeration at room temperature for 4 hours. Using the method in wastewater can inhibit the growth of anaerobic bacteria and avoid the phenomenon of anaerobic activated sludge bulking.

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PUM

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Abstract

The invention discloses a method for inhibiting expansion of anaerobic active sludge, comprising the following steps of: firstly adding an inorganic salting liquid containing 5-10% of ferrous sulphate, 10-20% of cupric nitrate, 5-20% of cobalt nitrate and the like into wastewater, stirring, adding active substances such as 5-20% of kaolin, 10-20% of calcium carbonate and the like into water after 20-40 min, adjusting pH value of water to 6.5-8.5, and carrying out oxygen-enriched aeration at normal temperature for 2-4 hours. According to the invention, with the addition of the inorganic heavy metallic salts and active substances, the growth of anaerobic bacteria is inhibited and consolidation performance of sludge is raised so as to improve sludge settleability; and in addition, through oxygen-enriched aeration, production of anaerobic bacteria can be further inhibited so as to prevent expansion of anaerobic active sludge.

Description

technical field [0001] The invention relates to a method for inhibiting the expansion of anaerobic activated sludge, which belongs to the field of sludge treatment. Background technique [0002] The bulking of anaerobic activated sludge is mainly caused by the continuous large-scale reproduction of anaerobic bacteria in water. The problem of sludge bulking is a difficult problem that has been accompanied and often occurred since the generation of activated sludge. Its main characteristics are: sludge The structure is loose, the quality becomes lighter, the sedimentation compressibility is poor, the SV value increases, sometimes reaching 90%, and the SVI reaches more than 300, a large amount of sludge is lost, the effluent is turbid, the secondary sedimentation is difficult to separate solid and liquid, and the return sludge concentration is low, sometimes Also accompanied by the generation of a large amount of foam, it is impossible to maintain the normal work of biochemical...

Claims

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Application Information

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IPC IPC(8): C02F9/14
Inventor 涂保华
Owner CHANGZHOU UNIV
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