Ship oily wastewater pretreatment method and device

Abstract

The invention belongs to the field of wastewater treatment, and discloses a ship oily wastewater pretreatment method which comprises the following steps: firstly, obtaining sample wastewater, standing for a preset pre cipitation time, then dividing the preset precipitation time into a plurality of continuous preset precipitation stage durations, taking the total precipitation time of the sample wastewater, the thickness value of the scum layer, the thickness value of the water layer to be treated and the thickness value of the silt layer as single-time layered modeling data, and acquiring the single-time layered modeling data at intervals of the phase measurement interval time length corresponding to the preset precipitation phase time length; then repeating the process for preset times, performing data fitting on all obtained single-time layered modeling data, and obtaining a layered data model; and finally, respectively determining the thickness of the scum layer and the thickness of the water layer to be treated of the oily wastewater according to the total precipitation time of the oily wastewater and the layering data model, removing the scum layer, and discharging the water layer to be treated. The invention further discloses a ship oily wastewater sediment discharging device used in cooperation with the method.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a pretreatment method and device for ship oily wastewater. Background technique [0002] Ship waste water refers to the waste water discharged by the ship after regularly cleaning the relevant equipment in the ship, or performing auxiliary operations or maintenance processes. These cleaning or auxiliary water use nearby sea water, because ship waste water includes sea water, oil and solids. Scum and sediment, therefore, in the pretreatment of wastewater, it is necessary to separate seawater, grease, solid scum and sediment, and then obtain the separated seawater separately for subsequent treatment. [0003] At present, the existing technology is usually to connect the ship wastewater into the oil separation sedimentation tank for static sedimentation, and then discharge the seawater layer formed after the sedimentation to the rear channel. [0004] The problem wit...

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Problems solved by technology

[0004] The problem with this method is that because the output of wastewater from each ship varies greatly, and the capacity of the oil separation sedimentation tank has a volume limit due to environmental constraints, when the capacity of the oil separation sedimentation tank is not enough to accommodate the ship wastewater, it will It is necessary to change the sedimentation time of ship wastewater in the oil separation sedimentation tank, and discharge it to the rear channel as soon as possible, that is, use time to change the space, and the thickness of the layered seawater, grease, solid scum and sediment formed by ship wastewater varies with the sedimentation time. Therefore, this leads to different sedimentation time each time, and the layered composition formed is also different, which makes it difficult for relevant staff to determine the accurate layered composition, resulting in the discharged seawater often containing a large amount of solids scum, thus affecting the further treatment of subsequent seawater, and also easily causing loss to subsequent equipment

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