Type: Leaflet Language: Industry: Marine
Without limitations: Evac MBBR
Type: Article Language: English Industry:
Operating principle of Evac MBBR
The treatment process consists of the following phases:
The next stage is the removal of coarse solids and debris from the wastewater using a rotating drum. The screening unit incorporates an automatic spaying system that ensures the screen surface remains clean and free of solids build-up.
Collecting and blending the influent waste streams in a mixing tank and equalizing the flow and load to the bioreactors is an important process in the MBBR system. The gray water collection system discharge pumps are controlled to optimally blend the wastewater.
The MBBR process is based on the biofilm principle using polyethylene carrier elements. The carrier elements are less dense than water and provide a large protected surface for bacteria culture. Bacteria degrade the organic matter in the wastewater to produce clean water, carbon dioxide, and sludge. The biofilm thickness is maintained and controlled through continuous sloughing created by the aeration mixing process.
Dissolved air flotation (DAF)
Following the MBBR process, DAF removes the sludge by dissolving air in the water under pressure and then releasing the air at atmospheric pressure in a flotation tank. The released air forms micro bubbles that adhere to the suspended matter, causing it to float to the surface of the water where it is removed with mechanical paddles.
The tertiary polishing system provides a positive barrier to ensure that the total suspended solids discharge requirement is met in higher-than-normal loading events. The polishing filter is a compact filter system with an automated backwash cycle.
Ultraviolet (UV) disinfection
UV light is used to disinfect the treated wastewater in high-intensity, low-pressure, multi-lamp UV reactors. No cleaning chemicals are needed since the reactors are equipped with automated wiper mechanisms that automatically clean the quartz sleeves. The multiple-lamp configuration provides redundancy to ensure that sufficient levels of UV radiation are maintained even if a lamp fails.