Desalter Wastewater Treatment Solution

2026-08-04 14:29:47

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SINOKLE

Oil-bearing wastewater treatment from atmospheric-vacuum desalting units

High-efficiency coalescing oil removal +CDFUCyclonic dissolved-air flotation | Pure physical separation | Internationally advanced level

90%+

Oil removal rate

<50mg/L

Effluent oil content

<1%

Water content of recovered oil

Chemical reagents

Process Overview

Characteristics of desalter draw-off water

High oil content with large fluctuationsHigh content of resins and asphaltenesSevere emulsificationSmall oil-water density difference

Industry Pain Points

Traditional processes have high treatment costs and unsatisfactory results

Frequent oil exceedance in influent to wastewater treatment plants

Seriously affects compliant discharge and reuse stability

Long treatment process with large footprint

SINOKLE Solution

"High-efficiency coalescing oil remover +CDFU cyclonic dissolved-air flotation" patented technology: pure physical separation requiring no chemicals, reaching an internationally advanced level.

Stable operation
Excellent treatment effect with consistently compliant effluent

Minimal footprint
Compact skid-mounted design

Closed and pressurized
Fully automatic operation, safe and environmentally friendly

Online installation
Can be put into operation without halting desalter production

Treatment Effect

0.5~5%

Influent oil content

<50mg/L

Effluent oil content

<100mg/L

Stably meets downstream influent requirements

Core Economic Benefits:Recovers large quantities of high-quality crude oil, avoids generation of oily hazardous waste, substantially reduces solid hazardous-waste treatment costs, and achieves both economic and environmental benefits.

Process Flow

Desalter draw-off water

Oily wastewater

High-efficiency coalescer

Coalescence separation

CDFU

Cyclonic dissolved-air flotation

Compliant discharge

<100mg/L

Process Description:Desalter draw-off water first passes through the high-efficiency coalescing oil remover to remove most dispersed oil, then enters theCDFUto remove emulsified oil and fine oil droplets; the final effluent oil content stably remains below 100 mg/L, meeting the influent requirements of downstream wastewater treatment plants.

Technical Advantages

Innovative separation principle

Relying on gas-water and oil-gas-water density differences, oil removal is unaffected by the density of the contaminated oil, greatly improving efficiency

High-efficiency coalescing oil remover

High separation efficiency, strong shock resistance, low fouling tendency, low energy consumption

High-efficiency dissolved-air flotation

Compact structure; removes emulsified oil without dosing, with stable performance

High shock resistance

Continues to meet standards stably even under severe oil-content fluctuations

Fully automatic control

Automated and intelligent control with low labor cost

Safe and environmentally friendly

Fully enclosed operation with no dangerous gas leakage

Comparison with Traditional Technology

Comparison Item	Traditional Technology	SINOKLE Solution
Separation Principle	Physical settling / liquid-liquid centrifugation	High-efficiency coalescence + centrifugation + three-phase separation
Emulsified Oil Removal	Cannot be removed	Can remove most emulsified oil
Oil Removal Effect	Low compliance rate	Stable compliant effluent
Chemical Reagents	Requires dosing; high secondary treatment cost	Pure physical separation; no secondary cost
Shock Resistance	Poor; unstable effluent	Good; strong adaptability
Degree of Automation	Low; high operating intensity	Intelligent advanced control
Anti-fouling	Prone to clogging; requires periodic cleaning	Not prone to clogging; maintenance-free
Safety & Environment	Semi-enclosed; gas leakage	Enclosed and pressurized; safe and eco-friendly

Application Cases

No.	Project Name	Treatment Capacity	Location	Time
1	CNPC Yunnan Petrochemical atmospheric-vacuum desalter oil-removal skid project	105 m3/h	Kunming, Yunnan	2025
2	A petrochemical enterprise in Shandong desalter wastewater treatment project	30 m3/h	Weifang, Shandong	2025
3	CNPC Urumqi Petrochemical desalter and tank-farm black-water treatment	150 m3/h	Urumqi, Xinjiang	2023
4	China's first high-gravity extra-heavy-oil desalter wastewater treatment project	38 m3/h	Ningbo, Zhejiang	2022
5	CNPC Jinxi Petrochemical desalter wastewater treatment project	50 m3/h	Jinxi, Liaoning	2022
6	CNPC Sichuan Petrochemical desalter wastewater treatment project	70 m3/h	Chengdu, Sichuan	2020
7	CNPC Dushanzi Petrochemical desalter wastewater treatment project	100 m3/h	Dushanzi, Xinjiang	2019
8	Sinopec Cangzhou Petrochemical desalter wastewater treatment project	50 m3/h	Cangzhou, Hebei	2019

Knowledges