High-Efficiency Advanced Wastewater Treatment Process: CDFU + CDOF
In the field of industrial wastewater treatment, advanced upgrading of biotreated tailwater has long been a pain point for the industry. Conventional processes often face low COD removal efficiency, high operating costs, and unstable effluent quality, making it hard to meet increasingly stringent environmental discharge standards. Currently, the approach is centered onCDFUcyclonic dissolved-air flotation +CDOFozone catalytic oxidation as the core pretreatment unit creates optimal influent conditions for various downstream biochemical advanced-treatment processes, building a complete treatment chain of 'front-end precise impurity removal and modification - core advanced oxidation degradation - back-end biological deep purification' that achieves stable compliant discharge and resource reuse of the wastewater.
I. Core process logic: two units working in concert to safeguard the downstream biochemical process
This process breaks the traditional single model of 'front-end biochemistry + back-end advanced treatment' and is centered onCDFUandCDOFtwo core units, focusing on the key problems of refractory pollutants, suspended solids, and poor biodegradability in biotreated tailwater, clearing obstacles for the efficient operation of various downstream biochemical advanced-treatment processes. The three-stage units work in concert to achieve staged, high-efficiency pollutant removal.
1. CDFUCyclonic dissolved-air flotation unit: efficient solid-liquid separation to remove interfering pollutants
The residual suspended colloids, aged sludge, hydrophobic organics, and oily substances in biotreated tailwater are the main interfering factors for downstream ozone catalytic oxidation and various biochemical advanced-treatment processes; they not only consume ozone chemicals but also clog media and inhibit microbial activity.CDFUThe cyclonic dissolved-air flotation device enhances the collision and adsorption of microbubbles with pollutants through a cyclonic centrifugal field, and together with a water conditioner dosed by the dosing unit rapidly achieves flocculation, floatation, and separation of pollutants. This unit efficiently removes suspended solids, colloids, and oily substances, with a removal rate above 90%, and simultaneously reduces part of the COD bound to suspended solids, creating low-load, low-interference influent conditions for the ozone catalytic oxidation unit. The off-gas from separation is collected uniformly into a tail-gas treatment device to avoid secondary pollution and ensure the environmental soundness of system operation.
2.CDOFOzone catalytic oxidation unit: directional degradation of refractory organics, greatly improving wastewater biodegradability
CDFUThe treated effluent entersCDOFthe ozone catalytic oxidation device. Under the synergy of the strong oxidizing ozone supplied by the ozone generator and a special catalyst, ozone is catalytically decomposed to generate hydroxyl radicals (middot OH) that attack and break the molecular chains of refractory organics non-selectively, oxidizing them into easily biodegradable small-molecule organics while directly removing part of the residual COD. Compared with the traditional ozone oxidation process,CDOFthe technology greatly raises ozone utilization (above 99.98%), reduces chemical dosage, lowers operating costs, and improves treatment efficiency. After this unit, the wastewater B/C ratio can rise above 0.3, creating excellent nutrient-substrate conditions for microbial degradation in various downstream biochemical advanced-treatment processes and thoroughly solving the traditional problem of poor influent biodegradability and low treatment efficiency in advanced biochemical treatment units. The tail gas from the unit is fed uniformly into the tail-gas treatment device to achieve zero ozone emission, balancing treatment effect with environmental requirements; a backwash water system regularly cleans and maintains the device to ensure catalyst activity and stable equipment operation.
3. Downstream biochemical advanced-treatment unit: relying on the front-end pretreatment advantage to achieve stable compliant effluent
AfterCDFUandCDOFdual optimized treatment, the wastewater has low suspended solids and markedly improved biodegradability; entering various downstream biochemical advanced-treatment processes, the microbial community can fully exert its degradation performance, efficiently biodegradating and filtering small-molecule organics, ammonia nitrogen, and other pollutants. Thanks to the precise pretreatment of the front-end process, the operating load of the downstream unit is greatly reduced, the media clogging risk drops significantly, the operating cycle is extended, and the effluent quality is more stable and reliable.
II.Core process advantages: dual-core driving to build triple safeguards for the downstream process
Greatly improved pollutant removal efficiency
CDFU+CDOFThe synergistic action of the two units gives excellent removal of COD, suspended solids, color, and other pollutants in biotreated tailwater, with a COD removal rate of 40%-70% (depending on water quality). It not only directly cuts most refractory pollutants but also transforms the wastewater into high-quality influent suitable for downstream biochemical treatment, achieving the dual effect of 'front-end pollution reduction + back-end quality improvement'.
Significantly enhanced stability of the downstream process
The front-end pretreatment unit effectively removes interfering substances such as suspended solids and oil, avoiding media clogging and microbial poisoning in the downstream biochemical unit; ozone catalytic oxidation improves wastewater biodegradability, giving the downstream unit higher microbial community activity and more stable treatment efficiency, and the whole process can adapt to varying water quality and run stably over the long term.
Economically controllable operating costs
CDOFOzone catalytic oxidation greatly raises ozone utilization and reduces power and chemical consumption; front-end pretreatment reduces the load on the downstream biochemical unit and cuts backwash frequency and maintenance costs, lowering comprehensive operating cost by more than 30% compared with traditional Fenton, electrocoagulation, and similar processes.
Green, environmentally friendly, no secondary pollution
The ozone oxidation process produces no chemical sludge; the tail gas is treated uniformly and discharged up to standard, there is no chemical residue, and no secondary pollution is generated, in line with green and environmentally friendly development concepts.
III. Application scenarios and value
The process is widely suitable for advanced treatment of biotreated tailwater in the chemical, printing and dyeing, pharmaceutical, and municipal sewage industries, and is especially suited to upgrading projects of existing wastewater treatment plants. ThroughCDFU+CDOFthe empowerment of the core pretreatment unit, enterprises can not only achieve stable compliant discharge and avoid environmental risks but also reduce fresh water consumption through effluent reuse, realizing water resource recycling with both environmental and economic benefits.
CDFU+CDOFBy collaboratively empowering the downstream biochemical advanced-treatment process, with precise front-end pretreatment as the core and high efficiency and stability as the goal, it provides a reliable solution for advanced treatment of industrial biotreated tailwater and helps enterprises achieve the dual goals of environmental compliance and green sustainable development.
