A method for controllable OH free radical synergistic degradation treatment of wastewater containing polysaccharide polymers
A technology of synergistic degradation and polymer, applied in natural water treatment, filtration treatment, sedimentation treatment, etc., can solve problems such as difficult sinking, large amount of mud, and inability to effectively remove high-viscosity fracturing waste liquid impurities, etc., to achieve improved treatment Efficiency, reduction of treatment links, and improvement of oxidation treatment efficiency
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Embodiment 1
[0026] Taking the treatment of guar gum-based oilfield fracturing waste fluid as an example, its viscosity is 30mpa·s, chromaticity is 200 degrees, COD is 3500mg / L, and suspended solids content is 170mg / L. The specific treatment methods are as follows:
[0027] 1L of ferrous sulfate aqueous solution with mass concentration of 20%, 1.5 mL of sodium hydroxide aqueous solution with mass concentration of 10%, and 2L of sodium hypochlorite aqueous solution with mass concentration of 10.5% were transported to a heating device through a metering pump connected to it. In a tubular reactor, the reaction was heated at 70 °C for 30 s. Then, the obtained reaction solution and 45 L of guar gum-based fracturing flowback fluid were immediately pumped into a reactor with stirring, and the oxidation reaction was stirred for 40 min. After the reaction is completed, it is settled in the sedimentation tank for 20 minutes, and then filtered through a quartz sand filter with a particle size of 0.5 ...
Embodiment 2
[0029] Taking the treatment of oilfield drilling waste fluid containing carboxymethyl cellulose as an example, its viscosity is 180mpa·s, chromaticity is 170 degrees, COD is 1500mg / L, and suspended solids content is 130mg / L. The specific treatment method is as follows:
[0030] 1L of ferrous sulfate aqueous solution with mass concentration of 20%, 2mL of sodium hydroxide aqueous solution with mass concentration of 10%, and 4L of sodium chlorite aqueous solution with mass concentration of 10.5% were respectively transported to a heating system with a metering pump connected to it. In the tubular reactor of the device, the reaction was heated at 60°C for 70s. Then immediately the obtained reaction solution and 70 L of oilfield drilling waste liquid containing carboxymethyl cellulose were pumped into a reactor with stirring, and the oxidation reaction was stirred for 40 minutes. After the reaction is completed, it is settled in the sedimentation tank for 30 minutes, and then filt...
Embodiment 3
[0032] Taking the treatment of fracturing waste fluid containing guar gum as an example, its viscosity is 180mpa·s, chromaticity is 170 degrees, COD is 1500mg / L, and suspended solids content is 130mg / L. The specific treatment methods are as follows:
[0033] 1L of ferrous sulfate aqueous solution with mass concentration of 18%, 1mL of potassium hydroxide aqueous solution with mass concentration of 10.5%, and 3L of sodium chlorite aqueous solution with mass concentration of 12.5% were respectively transported to a heating system with a metering pump connected to it. In the tubular reactor of the device, the reaction was heated at 50 °C for 90 s. Then, the obtained reaction solution and 50 L of guar-containing fracturing waste fluid were immediately pumped into a reactor with stirring, and the oxidation reaction was stirred for 40 min. After the reaction is completed, it is settled in the sedimentation tank for 20 minutes, and then filtered through a quartz sand filter with a pa...
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