CDFU vs. MACT: Technical Performance in Oily Firefighting Wastewater Treatment
This article uses a parameter-by-parameter comparison to break down the two core pieces of equipment in SINOKLE's oily firefighting wastewater treatment process——CDFU(cyclonic dissolved air flotation unit) andMACT(modified activated carbon adsorptionhigh-efficiency regeneration technology), as well as the gap between them and conventional technologies.
I.CDFU Parameter comparison with conventional dissolved air flotation
CDFU is a patented product of SINOKLE. Building on internationally advanced technology, it organically combines cyclonic centrifugal separation with flotation separation, and throughCFD optimization has been developed into this product.
Item | Conventional DAF | CDFU(cyclonic DAF) |
Treated water quality | Oily (with suspended solids) wastewater | Oily (with suspended solids) wastewater |
Retention time | 15~40min | <5min(only~) |
Oil removal efficiency (single stage) | 60%~85% | >90% |
Suspended solids removal rate (single stage) | 50%~70% | >80% |
Removal particle size (>80%) | >5μm | <3μm |
Bubble diameter | 5μm~100μm(moderate uniformity) | 5μm~30μm(good uniformity) |
Operation mode | Manual, open type | Automatic, enclosed operation |
Structure type | Reinforced concrete | Pressure-vessel skid-mounted equipment |
Three structural design features support the above performance: the dual tangential inlets provide greater rotational speed and more stable swirling flow, stronger resistance to fluctuation, and can adapt to turndown large fluctuations in rate (50% variation); the dual flotation zones divide the tank into an inner flotation zone and an outer flotation zone via the central tube, refining the flow and preventing oil droplets from being entrained in the effluent; the cyclonic desanding design directs heavier particles along the inner tube wall into the conical zone for periodic fluidized sand discharge, which is less prone to clogging.
II.MACT Parameter comparison with conventional activated carbon
MACT is a patented product of SINOKLE. Through modification of conventional activated carbon, it specifically improves thePFCS adsorption effect and rate on pollutants, and achieves recycling through the patented microwave high-efficiency regeneration technology.
Item | Conventional activated carbon | MACT |
Treated water quality | Oily firefighting wastewater | Oily firefighting wastewater |
Retention time | 20min | 10min |
COD Removal rate | 60% | 80% |
PFOA Removal rate | 10% | 80% |
Performance efficiency | 60%-70% | 85%-90% |
Effluent stability | Medium | High |
Sludge volume | Low | Very little; regeneration |
Reuse rate | 90% | 95% |
Regeneration energy consumption | High | Low |
Regeneration time | Long | Short |
Activated carbon modification mainly includes physical surface modification (adjusting specific surface area and pore size distribution) and chemical surface modification (oxidation, reduction, loaded-atom, and surface acid-base modification) to obtain targeted adsorption performance.
Microwave high-efficiency regeneration is a patented technology of SINOKLE. Compared with conventional technologies such as high-temperature, biological, ultrasonic, and solvent regeneration, it features no chemicals required, low energy consumption, zero water consumption, high regeneration rate, and short cycle.
Microwave regeneration exploits the dipole reorientation polarization of polar substance molecules adsorbed on activated carbon in a microwave field, converting microwave energy into heat, so the activated carbon heats up rapidly and its pores recover quickly, reaching over a thousand degrees Celsius within minutes. As a physical regeneration method, it requires no backwashing and produces no additional wastewater.
IV. Overall indicators
The entire CDFU + MACT process achieves an oil removal efficiency of no less than90%, with low energy consumption (only 10%), low gas consumption (1%~3% throughput), stable performance, and can meet10%~120% the flow fluctuation range; compared with conventional technology, the footprint is less than10%, and the operating cost is less than30%, with ozone consumption20~25%, and can stably meet the Class IAstandard or higher.
