Cyclic Sequencing Activated Sludge (CSAS) is designed to operate in a cyclical manner in sequence of aeration, sedimentation, and effluent draw respectively. As such, each CSAS tank is used for the dual functions of aeration and sedimentation, thus eliminating the use of an external secondary clarifier or sedimentation tank. The functions of aeration, sedimentation and effluent draw are all controlled automatically by a Programmable Logic Controller (PLC).
Key features of the CSAS:
- Each system allows for continuous flow of influent 24/7 while the system allows that the effluent to be removed in batches and as such, there is no need for a large holding tank which may reduce odour.
- Very efficient use of energy as the CSAS system has a highly efficient diffuser system which we employ through the use of proven and highly efficient blowers, along with thoughtfully designed instrumentation for process control.
- Effectively removes BOD with a high level of consistency and reliability and has been installed in more than 100 different projects with great success. Each CSAS is customized for the specific influent characteristic, flow and outcome desired.
- Has the ability for several processes to take place in a single system. Through thoughtfully designed control systems, the CSAS allows sufficient time for oxidation through aeration, denitrification through creating an anoxic environment, settling of suspended solids as well as allowing for sustainable growth of activated sludge.
- The system eliminates the need for a separate settling tank or clarifier for the removal of suspended solids. It results in great savings in space and energy consumed.
- The CSAS can be designed to meet different flow requirements from 20m3 /d to 50,000m3 /d. Each system can be used as a standalone or can be coupled together for different variations of influent flow.
- BW Water values designs that will bring about savings in both future operations and maintenance. For example, we employ the smart use of decanters instead of mechanical actuators to minimize potential maintenance constraints yet achieving a reliable and high effective outcome.
