Oil Removal Solutions for Industrial Oily Wastewater
Oil removal treatment process for petroleum and chemical industry wastewater
Separation for oil-water is an important step in the early pretreatment of industrial wastewater, and no volatile organic compounds (VOCs) are produced after treatment.No oily sludge (HW08)，hazardous waste，is generated. Reducing the burden on subsequent biochemical processes and lowering operating costs. Emulsification is achieved through purely physical methods,And the waste oil can be utilized as a resource after separation of oil .
The prime technologies for oil-water separation use physical methods include technology of hydrocyclone separation , coarse coalescence, and technology of inclined plate coalescence . In addition, they also include technologies such as special material aggregation and separation, precision filtration, membrane separation, and adsorption.
Our company's R&D has successfully developed a series of patented products, including the GZ-XX tank-within-tank, WYS-XX horizontal oil-water separator, and ZJYS-XX fine oil-water separator, by combining superhydrophobic materials with the principles of small oil droplet formation and separation, separation technology of hydrocyclone , and fluid dynamics. These products have filled the gap in the field of emulsified oil separation using purely physical methods.
The GZ-XX tank-within-tank is designed with an inner tank,and combined with hydrocyclone separation, and automatic floating oil collection and assembly of oil discharge based on the treatment capacity within the wastewater regulating tank, enabling the tank-within-tank to perform oil removal, homogenization, and regulation functions. The key component is the hydracyclone separator (commonly known as the assembly of hydrocyclone tube ), which utilizes differences of density to separate tiny oil-water mixtures. It has the advantages of compact structure, small size, light weight, high oil removal efficiency, no moving parts, long life of service , and closed process without pollution.
The WYS-XX horizontal oil-water separator integrates the separation technology of hydrocyclone , the separation technology of inclined plate coalescence , and the technology of coarse coalescence. The coarse coalescence filter made of stainless steel and the polymer coalescence filter separate oil droplets with different sizes. The oil content in the separated oily wastewater is ≤50mg/L (excluding emulsified oil and dissolved oil), which meets the requirements of device classification control or the inlet requirements of subsequent treatment equipment.
The ZJYS-XX fine separator for oil-water is an upgrade of the WYS-XX horizontal separator for oil-water. The fine demulsification material replaces the coarse polymer material, enabling it to capture emulsified oil and coalesce it into larger droplets, thus achieving separation of oil-water. The surface of the inclined plate component is coated with a oleophilic and hydrophobic coalescence material coating, making its coalescence effect more powerful. The total oil content in the outlet of the ZJYS-XX fine separator of oil-water is ≤20mg/L.
After years of analysis and summarization, the pretreatment process of oil removal for oily wastewater has been upgraded, as shown in the figure:
Collection, regulation, and pre-treatment for oily wastewater from wastewater treatment plants (stations) in petrochemical and coal chemical industries.
Collection, regulation, and pre-treatment for oily wastewater, hold-washing water, and ballast water from ports, docks, and oil depots.
Pre-treatment for oily wastewater discharged from the equipment in petrochemical, coal chemical and other industries.
Pre-treatment for oily wastewater from offshore oil extraction and drilling platforms.
Oil-water separation for oilfield produced water, pre-treatment for oil removal before drainage of crude oil electric dehydration unit.
Pre-treatment for various oily wastewater from onshore industrial and mining enterprises.
Serial Number | Projects Compared | "Oil separator" + "Regulating tank" + "equipment of two-stage dissolved air flotation " | Wastewater regulating tank "Tank -in- Tank" + "Horizontal oil-water separator" + "Dissolved air flotation equipment" | "Tank -in- Tank" + "Horizontal oil-water separator" + "Fine oil-water separator" |
1 | Occupation of land | Large area occupied | Compact structure, partially enclosed operation. | Compact structure, fully enclosed operation. |
2 | Effect of oil removal | Remove most of the floating oil, dispersed oil, and some emulsified oil (using air floatation and demulsifier). | Remove most of the floating oil, dispersed oil, and some emulsified oil (using air flotation and demulsifier). | Physical methods can remove floating oil, dispersed oil, and also remove most of the emulsified oil. |
3 | Scope of application | The ability to withstand load shock is poor under stable water quantity and quality conditions. | It has strong resistance of impact and can adapt to a wide range of water volume changes; | It has strong resistance of impact and can adapt to a wide range of water volume changes. |
4 | Performance of Oil and sludge discharge | Oil drainage and sediment removal in difficulty | The equipment is equipped with specialized facilities for oil and sludge discharge. | The equipment is equipped with specialized facilities for oil and sludge discharge. |
5 | Operation | Dosing, high power consumption; mechanical transmission, many vulnerable and consumable parts, and heavy maintenance workload. | Dosing, high power consumption; mechanical transmission, with many vulnerable and consumable parts, resulting in a heavy maintenance workload. | No need for dosing, no transmission device, no wear parts, high degree of automation, minimal maintenance workload, and only periodic replacement of filter cartridges. |
6 | Investment | The comprehensive investment cost is the highest, and a small portion of the investment cost can be recovered in the same year from the received waste oil. | The comprehensive investment cost is relatively high, but the investment cost can be recovered within the same year from the received waste oil. | The comprehensive investment cost is relatively low, and the investment cost can be recovered within half a year to one year after receiving the waste oil |
7 | Secondary environmental pollution | The air floatation dosing process generates floating and sedimentary residues; the oil discharged from the oil separator is recovered after dehydration. | The process of air flotation dosing generates floating and sedimentary residues; certain equipment employs physical treatment techniques, and the waste oil collected by the first two devices can be recovered directly . | All processes utilize physical treatment technology, no secondary pollution, and the received waste oil can be recovered directly. |
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