A device and method for air flotation to strengthen multi-stage fiber coalescence and oil removal
A coalescence and fiber technology, which is applied in the field of air flotation enhanced multi-stage fiber coalescence and oil removal methods and devices, can solve the problems of high operating pressure drop, low separation efficiency, and poor demulsification effect, so as to reduce the pressure drop of the device, Uniform distribution and improved coalescence efficiency
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Embodiment 1
[0055] In this example, the emulsion to be separated comes from a laboratory-made emulsion. In the experiment, a peristaltic pump and a metering pump were used to transport diesel oil and tap water to the emulsification tank in proportion, and the emulsification tank was continuously stirred at a speed of 900 rpm for 45 minutes to obtain an emulsion with uniform droplet size distribution.
[0056] The particle size distribution of emulsified droplets was measured by optical microscope and Image-Pro Plus software. The measurement results show that the average diameter of the oil droplets at the inlet of the coalescer is 10.8 μm, and more than 85% of the oil droplets have a diameter in the range of 3.0 to 15.0 μm. In the experiment, the oil concentration at the inlet of the coalescer was kept at 600mg / L, and the oil concentration in the water was measured with an infrared spectrometer according to the national environmental protection standard HJ 637-2012.
[0057] In the exper...
Embodiment 2
[0059] In this example, the emulsion to be separated comes from a laboratory-made emulsion, and the particle size and concentration detection methods are the same as those in Example 1. Isooctane and tap water are sent in parallel to a static mixer through a peristaltic pump and a metering pump to prepare an O / W emulsion. After the oil-water two-phase passes through the mixer, the oil phase forms an average particle size of about 10 μm (> 85%) in water. of emulsion.
[0060] In the experiment, the oil concentration at the inlet of the coalescer was kept at 300mg / L, and the gas flow rate in the first aeration zone was 5*10 -4 L / s, the diameter of the control bubble is 20μm; the gas flow rate of the second aeration zone is 1*10 -5 L / s, the diameter of the control bubble is 10μm; the oily sewage flows through the rectification plate, demulsification layer, coalescing layer and drainage layer in sequence at a superficial velocity of 0.01m / s; 0.8; ε in the coalescing layer 1 is ...
Embodiment 3
[0062] In this embodiment, the liquid to be separated is taken from the oily sewage in the 908# sewage pool of a domestic organic silicon production enterprise. Since the sample is taken from the settling tank after the sedimentation treatment, the maximum concentration of petroleum in the sewage is no more than 600 mg / L. However, its concentration fluctuates greatly, and its dispersed particle size is very small, which belongs to a highly emulsified state. Table 1 shows the basic characteristics of this organic wastewater.
[0063] Table 1 Basic characteristics of organic silicon process wastewater
[0064]
[0065] When the oil concentration at the inlet of the coalescer is 236mg / L, the gas flow rate in the first aeration zone is 5*10 -4 L / s, the diameter of the control bubble is 20μm; the gas flow rate of the second aeration zone is 1*10-5 L / s, the diameter of the control bubble is 10μm; the oily sewage flows through the rectification plate, demulsification layer, coales...
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