CFCAS Wastewater Treatment System
Continuous Flow Cyclic Activated Sludge System
The Continuous Flow Cyclic Activated Sludge System (CFCAS) is more cost effective and produces a better grade of effluent than conventional systems used for treating municipal and industrial wastewater. In this compact system, flow equalization, biological oxidation, secondary Sedimentation and biological nutrient removal occur in a single basin, significantly reducing capital and operating costs.
Normal operation provides nitrification and denitrification without costly chemicals and additional equipment. Biological phosphorus removal is achieved with the CFCAS-DNP process option. Proven in over 100 operating plants worldwide, CFCAS is a low-cost and efficient solution to wastewater treatment problems.
THE CFCAS PROCESS
Wastewater continuously flows into the pre-react chamber where BOD is adsorbed onto the biomass. The pre-react chamber acts as an organic selector, increasing the efficiency of the system and prevention the accumulation of filamentous organisms (thus preventing bulking).
The partially treated waste then flows under the baffle wall to the main chamber. When air is on, the adsorbed BOD is further oxidized. When air is off, the remaining adsorbed BOD is carried to the bottom of the basin and is retained in the sludge blanket for final oxidation during subsequent aeration phases in low-load periods. When the sludge is in the settled state, treated effluent is ready for decanting.
CFCAS PROCESS ADVANTAGES
Municipal effluent: BOD5 and SS<15mg/L, NH3/N <1mg/L, T-N<5mg/,T-P<1mg/L..
RELIABILITY OF PERFORMANCE
Ability to process up to 6 x ADWF(Average Dry Weather Flow) with no flow balancing or solids washout.
Ability to withstand diurnal shock loadings or storm water as received with little or no degradation to effluent quality.
Sludge bulking control.
Excellent process flexibility.
Biological N and P removal.
Excellent future expansion flexibility.
LOWER CONSTRUCTION AND O&M COSTS
Requires no primary or secondary clarifiers and their associated pumping and control facilities for sludge and return activated sludge.
LOWER SLUDGE HANDLING COSTS
CFCAS produces a low volume of highly stabilized sludge, which significantly reduces sludge handling costs compared to conventional systems. Because the sludge has a low oxygen uptake rate (below 10 mg/g), it settles and dewaters readily. Sludge may be applied directly on the land without further treatment.
MINIMUM MANPOWER REQUIREMENTS
CFCAS is simple to operate and runs automatically, typically reducing manpower demands by at least 50 percent. Labor and maintenance costs are significantly lower than comparable systems using trickling-filters, continuous-activated sludge, oxidation-ditches, and rotating biological contractors.
The CFCAS system is easily expandable as your needs grow. To treat larger volumes of wastewater, several CFCAS basins can be constructed in parallel to handle increased flow requirements. Conventional plant expansion is much more difficult and expensive because multiple process units must be constructed and substantial amounts of piping, pumps and controls must be added. Since all CFCAS operations occur in one basin, staged construction and subsequent expansion are much simpler than with conventional configurations (e.g. oxidation ditches and trickling filter plants).
CFCAS DNP PROCESS OPTION
More than 90% removal of total nitrogen and total phosphorus is achieved with this proven, low-cost option. Meets or exceeds stringent phosphorus and nitrate regulations. No chemicals or additional tanks are required.
Wastewaters from the following industries
Pulp and paper