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oil-water separator

Oil water separators are widely used in the catering industry (pre-treatment of animal and vegetable oils for kitchen wastewater in hotels, restaurants, canteens, and food processing plants), the petrochemical industry (treatment of oily wastewater in refineries, chemical plants, and steel plants), the mechanical processing and shipbuilding industry (wastewater from metal processing, automobile manufacturing, parts cleaning, and ship engine room bottom oil wastewater), and offshore platforms (treatment of high salt, high oil wastewater such as production water, bilge water, and drilling wastewater).

National Service Hotline：400-611-6861
Product Introduction

An oil-water separator is a device that achieves physical separation based on the density difference between oil and water. It uses principles such as gravity settling, centrifugation, air flotation, and coalescence filtration to remove suspended and dispersed oil from oily wastewater, and the effluent meets discharge standards. Divided by application fields, it can be divided into two types: catering oil-water separators and industrial oil-water separators.

Technical Advantage
Reliable separation principle
Based on the density difference between oil and water, it naturally floats up by gravity without complex moving parts, ensuring stable and reliable operation.
Good corrosion resistance
The main body is made of 304/316L stainless steel, which is resistant to high salt, high humidity, and strong corrosive environments, and can adapt to harsh working conditions on offshore platforms.
Easy to maintain
compact structure, replaceable filter element, some models have automatic oil discharge and cleaning functions.
Process Selection

1. Selection based on wastewater source: Fully automatic integrated oil-water separators with high integration and no odor are preferred for catering wastewater; The use of coalescing or air floating oil-water separators for oily wastewater in industries such as petrochemicals and mechanical processing can effectively treat emulsified oil; Centrifugal oil-water separators are used for oilfield produced water and ship bilge water, with high processing capacity and strong resistance to impact loads.

2. Selection based on oil properties: Gravity or coalescence separators made of 304 stainless steel are used for processing animal and vegetable oils; Heating devices and explosion-proof systems are required for processing mineral oil and heavy oil; To process high concentration emulsified oil, it is necessary to use air flotation or membrane separation separators with demulsification function.

3. Select according to the effluent requirements: Gravity separators are selected for effluent that meets the third level standard of the Comprehensive Wastewater Discharge Standard (oil content ≤ 100mg/L); The first level standard for effluent requirements (oil content ≤ 10mg/L) is to use a coalescence separator; The effluent requirements for reuse water standards (oil content ≤ 5mg/L) use a combination of "coagulation+filtration" or "air flotation+membrane separation" equipment.

4. Selection based on processing scale: For small projects with a daily processing capacity of less than 50m ³, an integrated fully automatic oil-water separator should be selected; Modular combined oil-water separators are selected for medium-sized projects with a daily processing capacity of 50-500 cubic meters; Large scale projects with a daily processing capacity greater than 500m ³ use reinforced concrete structures for large-scale oil-water separation systems.


Equipment Selection

Parameter Description and Selection Points

Equipment type: catering oil-water separator (OSD-S series, SMGY series, etc.); Industrial oil-water separators (OWS series, SYF series, etc.); Compressed air oil-water separator; Marine oil-water separators (YWC series, HBN series)

Processing capacity for catering: 0.5-100m ³/h; Industrial 2-720m ³/h; Ship 0.1-5.0m ³/h (selected based on total tonnage)

Material: 304 stainless steel (standard for catering); 316L stainless steel (industrial, marine); Carbon steel anti-corrosion (general working conditions require anti-corrosion treatment)

Separation structure gravity separation type (simple structure, suitable for stable water quality); Air flotation type (high separation efficiency); Filtering/coalescing type (high precision, capable of handling emulsified oil)

Heating devices need to be equipped with electric heaters in cold regions to prevent oil solidification and blockage of pipelines

Oil discharge method: automatic oil discharge (automatically opening the oil discharge valve through the oil level sensor) or manual oil discharge (regular manual oil discharge)

The sludge discharge system is equipped with a sludge hopper or discharge pipe, and the settled sludge is regularly cleaned

The oil content in the effluent of catering wastewater is ≤ 100mg/L (GB 20425-2006 Grade III standard); Industrial wastewater ≤ 15mg/L or ≤ 5mg/L (according to discharge requirements)

Working pressure compressed air oil-water separator 0.1-2.5MPa; Conventional atmospheric pressure type 0.3-0.5MPa

Working temperature 0-50 ℃ (conventional type), optional configuration for heating type

The required inlet water quality is pH 6-9, oil content ≤ 600mg/L, and suspended solids ≤ 200mg/L

Installation methods include underground installation, above ground indoor installation (for small catering), integrated pry installation (for small and medium-sized projects, compact land occupation), and the ability to expand multiple groups in parallel

Automatic control fully automatic type equipped with PLC control system, oil level sensor, liquid level sensor, automatic oil and mud discharge, fault alarm, remote monitoring and other functions

Regularly clean the oil collection area and sludge (usually once a month to once a quarter), check the status of the filter element (filter type needs to be replaced according to pressure difference or time, and marine equipment needs to undergo type approval inspection according to the prescribed cycle)

Adhere to the standards GB/T 12917-2009 "Oil Pollution Water Separation Devices", HJ/T 243-2006 "Technical Requirements for Environmental Protection Products - Oil Water Separation Devices", CJ/T 295-2015 "Oil Separators for Catering Wastewater", GB 50015-2019 "Design Standards for Building Water Supply and Drainage", GB 3552-2018 "Emission Control Standards for Ship Water Pollutants", GB 50014-2021 "Outdoor Drainage Design Standards", and IMO MEPC. 107 (49) Resolution


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