Tackling the Coking Sour Acidic Wastewater Challenge: SINOKLE's CDFU + KHC Combined Process Achieves Efficient Demulsification and Resource Recovery
In the coking production process, acidic wastewater has always been a problem troubling enterprises. This type of wastewater has a complex composition, containing high concentrations of coke powder, emulsified oil, and various harmful chemical substances, which not only affect the stable operation of the production system but also pose potential threats to environmental safety and employee health. With increasingly strict environmental requirements, traditional treatment methods can no longer meet the needs; therefore, developing more efficient and reliable processes has become an urgent task for the industry.
1. The Treatment Challenges of Coking Acidic Wastewater
Coking acidic wastewater has the following salient characteristics:
High coke powder content and fine particle size:The coke powder particle size is mainly concentrated at 5-20 um, of which 10-15 um accounts for as high as 56.44%. These tiny particles easily deposit in equipment and pipelines, causing blockage.
High proportion of emulsified oil and extremely small oil droplet size:Emulsified oil accounts for more than 60% of the total oil, and the oil droplet size is mainly concentrated at 10-25 um. The emulsified state is stable, making oil-water separation difficult and seriously affecting the treatment efficiency of the stripper.
Large composition fluctuations:The oil content in the wastewater can reach 500-3000 mg/L, sulfide 10,000-20,000 mg/L, and ammonia nitrogen 10,000-20,000 mg/L. The pollutant concentration fluctuates violently and easily produces pungent odors, bringing harm to the surrounding environment and operators.
Equipment prone to clogging:During long-term operation, coke powder and emulsified oil form deposits inside the stripper; in severe cases they even cause unplanned shutdowns, resulting in huge economic losses.
These problems not only increase operating costs but also expose enterprises to the risk of environmental penalties. Therefore, finding a technical solution that can stably and efficiently remove pollutants has become the key to the green transformation of coking plants.
2. SINOKLE's Innovative Solution
To address these pain points, SINOKLE launched a process centered on CDFUcyclonic dissolved air flotation + fine filter + KHC high-efficiency coalescing oil remover as the core for coking acidic water treatment. This solution adopts a purely physical demulsification separation technology, requiring no chemical dosing and reducing secondary pollution risks at the source.
1CDFUCyclonic Dissolved Air Flotation System
As the front-end pretreatment unit,CDFUit uses micro-nano bubbles (diameter 5-30 um) to demulsify the emulsified oil. After the micro-nano bubbles fully contact the emulsified oil, they destroy the oil-water interfacial film, causing oil droplets to rapidly coalesce and float for separation. This unit achieves a single-stage oil removal efficiency above 90% and a suspended solids removal rate exceeding 80%; even with fluctuations in influent flow and quality, the system maintains stable treatment performance.
(2) Fine Filter
CDFUThe treated effluent enters the fine filter to further remove tiny suspended solids and residual coke powder, providing cleaner influent conditions for the subsequent KHC coalescing oil remover and ensuring the long-term stable operation of the process.
(3) KHC High-Efficiency Coalescing Oil Remover
The KHC uses patented coalescing packing and high-precision coalescing cartridges to achieve oil-water separation through purely physical coalescence; it can remove emulsified oil droplets above 0.1 um, with stable and reliable demulsification. The separated waste oil has low moisture content and high quality, and can be directly returned to refining, which not only reduces waste discharge but also realizes resource recycling, significantly lowering production costs.
3. Process Advantage Analysis
Advantage Dimension | Specific Performance |
Fully automatic enclosed pressurized operation | Greatly reduces the risk of leakage and odor spread, ensuring plant safety and environmental friendliness |
Mainly static equipment, low maintenance demand | High degree of automation, long maintenance cycle, strong operational reliability |
No chemical dosing | Avoids scum and sludge generation, reducing solid-waste disposal pressure |
Small footprint, strong shock-load resistance | Adapts to the actual situation of coking plants with limited space and large water-quality fluctuations |
Dual economic and environmental benefits | Waste oil recovery and reuse, energy saving and consumption reduction, while lowering environmental compliance risks |
4. Prospects
This new process has been successfully applied in some refining and petrochemical enterprises, with stable operation results and remarkable economic benefits.
As the technology continues to mature and spread, it is expected that more coking enterprises will adopt this solution, pushing the industry toward a low-carbon, green, and sustainable direction. This is not only a technological innovation but also an important milestone for the coking industry in meeting environmental challenges.
