BIOAZUL SBR (Sequential Batch Reactor) systems are compact wastewater treatment systems able to produce treated water complying with the existing quality standards for reuse. In these applied biological treatment systems, all the treatment process stages take place in a single tank, thereby reducing the need for surface area and the associated investment costs, in separate time phases* . SBR are operated in one or several cycles consisting of the following phases:
wastewater is introduced into the sequencing reactor.
the organic matter and nutrients contained in the wastewater are degraded. Intermittent aeration can be provided, thus, combining different conditions (aerobic, anoxic and anaerobic)
Settling: aeration and mixing in the reactor are interrupted so as to create favourable conditions for the settling of the activated sludge.
Emptying: once the clarified wastewater has been separated from the sludge blanket at the end of the settling process, it is removed from the reactor.
Inactive phase: (optional phase)
Sludge removal can take place at the end of the reaction phase, or during the settling, emptying or inactivity phases. The duration of each phase and of the complete treatment cycle is programmed according to the water purification objectives pursued. Likewise, the operational cycles can be modified according to the characteristics of the influent and the quality requirements imposed on the effluent; thus, in this case, as RichWater approach pursues concentrating nutrients in the effluent, only nitrification will be promoted, and not denitrification. This way, farmers will have access to a guaranteed and constant source of irrigation water, which is a huge benefit in arid regions.