Method modifying horizontal flow sedimentation tank into sedimentation floatation tank and modified sedimentation floatation tank

Abstract

The invention discloses a method modifying a horizontal flow sedimentation tank into a sedimentation floatation tank and the modified sedimentation floatation tank. The detailed method comprises: additionally arranging a separating device in the horizontal flow sedimentation tank to divide the horizontal flow sedimentation tank into a sedimentation area and a floatation area, additionally arranging a gas-dissolved water releaser and mud-discharging, oil-skimming and oil-collecting facilities in the floatation area simultaneously, and dividing the horizontal flow sedimentation tank into the sedimentation area and the floatation area which are independent to each other so that the corresponding functions are achieved well. A gas-dissolved device and a control system are additionally arranged outside the tank. Besides, an overflow pipe is additionally arranged, guarantees stability of the flat liquid level and adapts to the status of addition of treated water quantity, two functions including sedimentation and floatation are achieved, early sedimentation and later floatation are achieved, the treatment effect and the running stability of the horizontal flow sedimentation tank are greatly improved, and the method modifying the horizontal flow sedimentation tank into the sedimentation floatation tank and the modified sedimentation floatation tank are suitable for large-scale pre-treatment of sewage containing oil and suspended matter and can be used for a newly-built system and old equipment modification. Simultaneously, the modularized design achieves old equipment modification of the horizontal flow sedimentation tank in a short construction period, the investment is saved, and the production problem is solved.

Description

technical field [0001] The invention relates to a method for transforming an advection sedimentation tank into a sedimentation air flotation tank and the modified sedimentation air flotation tank. The sedimentation air flotation tank transformed by the method is suitable for treating large-scale sewage containing oil and suspended matter. Background technique [0002] The hot-rolling wastewater from iron and steel plants, because the water contains a lot of oil and suspended solids, needs to be treated before it can be recycled. Most of the existing treatment systems for hot rolling wastewater in iron and steel plants adopt the treatment process of "swirl pool-advection sedimentation tank-filter". The outlet weir and the outlet canal are composed of driving-type mud scraping and skimming oil / slag equipment, and sludge grabs or sludge discharge facilities are installed at the mud bucket. Due to the limitations of technology and equipment, as well as the increase in water tre...

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Problems solved by technology

Due to the limitations of technology and equipment, as well as the increase in water treatment capacity, many steel companies have more serious problems with the effluent water of hot rolling sewage treatment systems exceeding the standard. The filter material is hardened and clogged, the filter material is frequently cleaned or even unable to operate, and there is also the phenomenon of pool leakage. Since the amount of hot rolling sewage is often tens of thousands of cubic meters per hour, the scale of treatment equipment and facilities is large, and the water treatment system is allowed to stop production The time is short, and it is not feasible to tear down and rebuild the system, so there is an urgent need to renovate the old

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