Fine treatment system suitable for offshore oilfield production water and treatment method thereof
A technology for offshore oil fields and treatment systems, applied in mining wastewater treatment, multi-stage water treatment, water/sewage multi-stage treatment, etc. To achieve the effect of simple operation and maintenance, good impact resistance and small footprint
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Embodiment 1
[0025] A fine treatment system for offshore oilfield production water, including a water treatment system and a backwash system,
[0026] The water treatment system includes micro-bubble air flotation V1, dual media filter V2, high-speed cyclone filter V3, nano-ceramic fine filter V4 and backwash water separation tank T1. Oilfield production water and nitrogen in the nitrogen tank V5 pass through the air flotation The pump P1 mixes and produces tiny bubbles that enter the micro-bubble air flotation V1 from the water phase inlet of the micro-bubble air flotation V1, and the oil phase separated by the micro-bubble air flotation V1 flows into the backwash water separation from the oil phase outlet of the micro-bubble air flotation V1 In the tank T1, the gas separated from the microbubble air flotation V1 is discharged from the gas phase outlet of the microbubble air flotation V1 through the venting system V6, and the water phase separated from the microbubble air flotation V1 is i...
Embodiment 2
[0029] On the basis of Example 1, the micro-bubble air flotation V1 is arranged in a vertical container structure, and the micro-bubble air flotation V1 is generated by a multiphase flow dissolved air pump. The micro-bubble air flotation V1 can reduce the oil content in the oilfield production water to 30% -60mg / L; reduce suspended solids in oilfield production water to 20-50mg / L.
[0030] In the dual-media filter V2, the filter medium is quartz sand and anthracite, the oil content in the water discharged from the dual-media filter V2 is reduced to 10-20mg / L, and the suspended solids in the discharged water are reduced to 10-20mg / L.
[0031] In the high-speed cyclone filter V3, the filter medium is made of aluminum silicate particles, and the filter adopts a tangential water inlet method. The filtration rate is 2-3 times that of the ordinary filter. The content is reduced to 6-10mg / L, the suspended matter content in the discharged water is 2-5mg / L, and the median particle size...
Embodiment 3
[0033]On the basis of Example 2, in the nano-ceramic fine filter V4, the filter medium adopts modified porous nano-ceramic particles, the filter medium adopts the method of random packing, the filter adopts the tangential swirl water inlet method, and the nano-ceramic fine The oil content in the water discharged from the filter V4 is reduced to 3-6mg / L, the suspended matter content in the discharged water is 0.4-1.5mg / L, and the median particle size is 0.8-1.3μm.
[0034] The backwash water separation tank T1 adopts an upper and lower combined structure. The upper part of the backwash water separation tank T1 adopts a corrugated plate packing structure to separate larger solid particles in the water. The lower part of the backwash water separation tank T1 adopts a floating oil collector to collect Oil slick in water.
[0035] The sludge dewatering device T2 adopts a decanter centrifuge, and the moisture content of the sludge after being treated by the sludge dewatering device ...
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