The existing industrial wastewater cleaning plant was installed with the activated sludge procedure (aeration tank) with secondary sedimentation chamber. The biology is assisted by adding substantial volumes of external carbon sources as substrate substitute. The large dimension reactor volume (approx. 600 m³) causes significant operational costs and problems during winter operation due to temperature. The existing aeration tank is an enamel steel tank positioned above ground. The tank is corroding and no longer fit for purpose.
The wastewater from washing processes has variable flows (20-100m3/d), may contain high carbon concentrations (up to 10.000mg/l), can contain compounds which are hard to decompose (industrial cleaner) and a has a deficit of nutrients (N,P-deficits). Due to the range of food collected in the containers it is hard to estimate in advance which substances will flow into the sewage treatment plant. Therefore, the biological stage must be rugged and possess a high self-regulatory potential. The plant must be fully automatic with a simple to operate, simple control unit.
The wastewater is already pre-cleaned mechanically through filtering by the customer, the pH value is set close to 7. Afterwards, it reaches a buffer tank, which was reconditioned as M&A with big bubble aeration. Pre-decomposition can be controlled here, the sludge must be removed. The biology is filled via a level sensor, depending on the water level and integrating via a time function. In an subsequent lamella separator, the secondary sludge is removed from the clear water.
The core component is the container based fixed-bed biology. The submerged fixed-bed is more durable than the active sludge processes because organisms with longer generation times (specialists for just this substrateJ degradation) can be grown more easily due to the fixed sedentary medium.
The wastewater production fluctuates and depends on the amount of rinsing water. Therefore, the bioreactor is divided into cascades, designed as fully blended stirring vessel, where the wastewater flows through in sequence. On the one hand, this leads to a very high cleaning capacity, and on the other hand, the plant is more resistant to underload/ overload.
- Improving operational security
- state-of-the-art, decreasing operational costs
- quick construction time
- high quality and pre-assembled solution with no site work
Approval planning Installation, assembly and commissioning of the plant.
In this case, an industrial sewage treatment plant was upgraded with adaption to the actual load and considering the state of the art.
CFC-FB 100 Container – cascaded fixed-bed biology
CFC-LA 5 Container – Lamella clarifier