Defoaming agent for removing foams in waste water aerobic activated sludge pond and preparation method and application thereof
A defoaming agent and oxygen active technology, which are applied in the field of defoaming agent for eliminating foam in aerobic activated sludge ponds of wastewater and its preparation field, and can solve the problem of affecting wastewater, excessive discharge water quality indicators, and affecting the oxygenation of aerobic activated sludge. To ensure the normal operation and suppress the foaming trend
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[0020] The preparation method of the defoamer is: dissolving the active component organopolyether-siloxane copolymer and filler silica (its particle size distribution is within the range of 3-15 μm) into the carbon atom of the defoamer In the medium of number 3-7 cycloalkanol, surfactant and water, stir and mix vigorously. The surfactant is not particularly limited, cationic, anionic and nonionic surfactants are all available, but in terms of the defoaming activity of the defoamer and the dispersibility of the polyether-siloxane copolymer in the aqueous medium , can preferably use non-ionic surfactants. The quantity of said surfactant in the defoamer of the present invention should be enough to fully emulsify said polyether-siloxane copolymer in water medium, and the commonly used surfactant dosage is 10-20%.
[0021] The method of adding the defoamer is as follows: add the defoamer at the part where the sludge from the secondary sedimentation tank returns to the aerobic acti...
Embodiment 1
[0024] Take 200ml of the mixed solution of aerobic activated sludge and oil refinery wastewater in a 500ml measuring cylinder, blow air with an air pump to make it foam severely, stop blowing air when the foam height is 300ml, and the defoaming time > 30 seconds, add the disinfectant Foaming agent (0.5g / L diluent, the parts by weight of each component consists of: active substance: filler: defoaming aid: surfactant: water=48: 15: 20: 12: 5) after 2ml, promptly disappear The concentration of foaming agent is 0.0005%, the foam disappears rapidly, and the defoaming time is less than 4 seconds, which has good defoaming performance. Increase this defoamer (0.5g / L diluent) 4ml again, promptly defoamer concentration 0.0015%, the defoaming effect is more obvious, continue blowing, produce foam height in half an hour and be 30ml. The defoamer will not kill the microorganisms in the activated sludge and will not affect the quality of the effluent.
Embodiment 2
[0026] Get 45 parts of active components as organic polyether-siloxane copolymer, 15 parts of silica filler (its particle distribution is that the particle size is in the range of 3-15 μm) and dissolve to 20 parts of defoaming aid as the number of carbon atoms 3-7 cycloalkanol, 10 parts surfactant and 10 parts water medium. Add 200ml of the mixture of aerobic activated sludge and refinery wastewater into a 500ml measuring cylinder, blow air with an air pump to make it foam severely, stop blowing when the foam layer height is 300ml, defoaming time > 30 seconds, add After this defoamer (0.5g / L diluent) 6ml, promptly defoamer concentration 0.0015%, defoaming time is 15 seconds, continues aeration, produces foam height in half an hour and is 35ml.
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