A method for treating foam gas production wastewater and a foam gas production wastewater treatment device
A technology of gas extraction wastewater and its treatment method, which is applied in the foam gas extraction wastewater treatment device and the field of foam gas extraction wastewater treatment, and can solve the problems of inability to recover surfactants, etc.
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Embodiment 1
[0088] use figure 1 The shown device treats foam gas extraction wastewater, and the specific process is as follows.
[0089] (1) Send the foam gas extraction wastewater (its property parameters are listed in Table 1) into the precipitation unit, add sodium hydroxide to the foam gas extraction wastewater, adjust the pH value of the foam gas extraction wastewater to 10, and quickly A large amount of yellow-white precipitate was produced. The liquid-solid mixture obtained by the precipitation reaction is filtered with filter paper (purchased from Hangzhou Wohua Filter Paper Co., Ltd., the same below) to obtain a clear liquid phase, and the removal rates of suspended solids, condensate oil and COD (the three are respectively used for gas extraction with foam) Suspended solids, condensate oil and COD values in wastewater are listed in Table 2.
[0090] (2) The liquid phase output from the sedimentation unit is sent to the air flotation unit for air flotation. The air flotati...
Embodiment 2
[0103] Adopt the method identical with embodiment 1 to process foam gas extraction waste water, difference is, in step (2), adopt following method to carry out air flotation:
[0104] Inject air into the air flotation tank containing the liquid phase output from the sedimentation unit through the microporous gas distributor (pore diameter of 80-100 μm), the air-water volume ratio is 10:1, the foam overflows from the top of the air flotation tank, and lasts Air is supplied for 5 minutes until the height of the foam layer no longer rises. Remove the remaining foam on the top layer to obtain the recovered surfactant (the liquid carrying capacity is 860mL / L foam), and obtain the air flotation water.
[0105] The experimental results are listed in Table 2.
Embodiment 3
[0107] The same method as in Example 1 is used to treat the foam gas extraction waste water. The difference is that in step (2), the dissolved air pressure is 0.2MPa, and the foam layer is removed to reclaim the surfactant (the liquid carrying capacity is 148mL / L foam ).
[0108] The experimental results are listed in Table 2.
[0109] Table 1
[0110]
[0111] Table 2
[0112]
[0113] 1 : The removal rates of suspended solids, condensate and COD are based on the values of suspended solids, condensate and COD in foam gas recovery wastewater, the same below;
[0114] 2: The removal rate of COD is based on the COD value of the liquid phase sent to the air flotation unit, the same below; the change rate of foaming ability is based on the foaming ability of the air flotation inlet water, the same below;
[0115] 3 : The COD removal rate is based on the COD value of the air flotation water, the same below; the foaming ability change rate is based on the foaming abili...
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