Image of the inner container of the newly installed nested container

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The multi-tank equipment has just been installed at the wastewater treatment plant. The image below shows the inner tank as taken by me; I had intended to take some photos during the installation process as well, but the construction team was constantly welding inside, so I missed that opportunity. The image below was found on the internet; when I was preparing to post, I realized that I hadn’t taken a panoramic photo. I was worried that the image above wouldn’t be clear enough, so I found a clearer picture online. The image below was found on the Internet; I also gathered some information along the way to share and learn with everyone*. Overview of tank-in-tank systems: Applications of tank-in-tank systems include the treatment and purification of oily wastewater from oil fields, petrochemical industries, and olefin production; they can also be used to treat water extracted from oil fields so that it meets the standards required for reinjection ； The temperature of the oily wastewater medium is >15°C. The tank-in-tank technology transforms the previous open, single-function combinations of oil removal, homogenization, and regulation tanks (or vessels) into a systematic, enclosed, and automated process and set of equipment. It not only improves the quality of the wastewater effluent and results in very low water content in the recovered used oil (almost zero), but also simplifies operations, reduces space requirements, and improves the environment. Working principle: The canned-canner is designed based on the principles of hydrocyclone separation and automatic collection of floating oil. It combines functions of sewage regulation, homogenization, and oil-water centrifugal separation; under the action of centrifugal force, the oil, water, and sludge phases are separated (with a separation efficiency that is dozens of times higher than that of traditional static separation and inclined plate separation methods). The separated oil floats upward to the top of the inner tank, and an automatic skimming device installed in the inner tank is used to discharge the oil into an external oily waste collection tank ； The settled sludge remains in the conical chamber of the settling area, and can be discharged at any time through manual or automatic valves, thanks to the action of water pressure ； The separated wastewater enters the outer tank through siphons evenly distributed around it. Inside the outer tank, functions such as water distribution and flow disruption, collision aggregation and separation under flowing conditions, automatic collection of floating oil, and hydraulic sludge discharge from the cone bottom are integrated; it serves as a device for hydraulic hydrocyclone homogenization, oil removal, sedimentation, and tank regulation. This technology features an outer large tank with an inner tank inside it. The wastewater is pressurized by a lift pump and enters the inner tank through tapered transfer pipes. The oily wastewater undergoes high-speed rotation inside a multi-tube bundle hydrocyclone, where the difference in density between oil, water, and sludge is utilized to create different centrifugal forces for separation. The in-tank tank principle: The oil-containing wastewater from the production units enters the regulating tank via pipelines under a certain pump pressure, and then reaches the separation tube bundle of the hydrocyclone with multiple tangential inlets; this creates a first separation force within, enabling the spiral vortex-based separation of the three media – oil, water, and sludge – from top to bottom ； Another power source: a steam or air source, which uses gas at a certain pressure to enter the mixing and gas-distribution device of the separator, where it mixes with the medium to create an additional driving force; gravity is then utilized for the liquid-liquid separation. The efficiency of separating the medium substances using this technology is **improved**, and at the same time the issue of low separation efficiency caused by fluctuations in the hydraulic pressure from the incoming water due to its instability is resolved. The oil separated is collected once at the top via an automatic oil collection and discharge device. The medium after separation of sludge and water stays in the separation and sedimentation chamber (the middle tank), where the sludge settles at the bottom of the tank and is stored there. The wastewater separated from the inner tank to the middle tank overflows into the outer tank through siphons and overflow pipes, where it is stored, adjusted, and allowed to settle ； At the top of the siphon tube running from the intermediate tank to the outer tank, a uniquely designed secondary oil collector is installed to collect once again the heavier floating oil that has been filtered and broken down by the packing material inside the siphon tube; these features constitute the novelty and practicality of this patent. The outer tank ensures a certain amount of emergency storage capacity and retention time for wastewater, thereby contributing to a more uniform water quality. It plays a key role in oil removal and purification by buffering the water volume handled at different stages and facilitating the flow through the backup flotation system. This device has strong media adaptability and a wide range of applications. Adapt to large fluctuations in water volume and quality ； It is also perfectly suitable for the renovation of other tanks and traditional regulating tanks; it can completely replace existing concrete oil separation tanks, saving space. With no moving parts, it operates reliably for long periods without failures. The separation unit is made of stainless steel, which is resistant to corrosion, and thus plays a significant role in addressing emergency risks, helping companies save substantial amounts of money. Operating environment: The can-in-can system is suitable for use in outdoor areas at atmospheric pressure, where the geological structure is hard, stable, and suitable for industrial assembly. Technical parameters: 1. Processing capacity: 50–600 (per unit) m3/h. 2. Sewage inlet pressure: 0.1–0.4 MPa. 3. The steam inlet pressure for the mixer is 0.1–0.35 MPa, while the inlet pressure for the heat tracing pipe is >0.1 MPa. 4. Import oil content specifications