What is BIOFOR Technology and features of this technology?
BIOFOR uses a dense granular support media that serves as both a biological contactor and a filter, obviating the need for a separate clarification step. Both the influent wastewater and the needed process air flows into the system from the bottom of the unit to upwards. Process air, which is delivered into the media via a network of diffusers at the reactor's base, provides the required oxygen for aerobic biological activity. The up-flow pattern of air bubbles allows for exceptionally high oxygen transport in the media. The biological filtering system is based on a submerged bed design.
The biological filtration system can be regarded as a three-phase system:
A: Solid Phase: The filter material with attached biomass is the solid phase.
B: Liquid Phase: The wastewater that flows through the filter material is referred to as the liquid phase.
C: Gas phase: Oxygen for the oxidative process or nitrogen gas for denitrification.
How does BIOFOR work?
The effluent to be treated enters constantly from the bottom of the reactor, and the nozzle underdrain distributes it evenly throughout the entire filter surface area. Following that, the wastewater flows through the filter media, which traps the suspended solids. The high concentration of fixed-film biomass that is kept on the filter media during the filtration cycle eliminates carbonaceous and nitrogenous pollutants.
Air diffusers continuously feed air into the lowest section of the reactor in the aerated variants (for BOD removal and nitrification). Because the treated water is at the surface of the filter (in contact with the atmosphere) and the untreated water enters at the bottom, the adoption of a co-current upflow design helps to prevent odour formation.
The number of filters in the filtration service is determined by the amount of wastewater that enters the facility. Off-duty filters are aerated on a regular basis during low flow periods to keep the biomass in good shape. Operating costs (due to process air output) can be decreased because filters can be taken out of service when not in use.
Main Features of BIOFOR Technology
1: High rate primary tube settlers and integrated thickening gives space savings;
2: Enhanced primary treatment with the addition of coagulants and flocculants;
3: Two-stage high-rate filtration with increased external aeration and a biologically active medium;
4: Higher retention and contact are possible thanks to the co-current upflow movement of wastewater and air;
5: Treatment plant that avoids secondary sedimentation and instead recycles primary sludge;
6: Low-land needs due to deep reactors;
7: A system that is both compact and reliable;
8: Upflow filtration, in which the feedwater expands the filter media, distributing the biomass evenly across the bed;
9: Feedwater and air flow in the same direction reduces short circuiting and extends filter run durations;
10: Quick response to changes in flow and load exclusive nozzle floor design that ensures optimal fluid distribution throughout filtration and wash operations;
11: Washing system that can handle filter bed depths of up to 13 feet (4.0 m).
Applications of BIOFOR Technology
1: BIOFOR for the removal of BOD, COD, and TSS;
2: BIOFORfor ammonia nitrogen nitrification;
3: BIOFORfor BOD elimination and nitrification at the same time;
4: BIOFORfor nitrate elimination without extra carbon source as a pre-denitrification phase;
5: BIOFORfor nitrate elimination as a final denitrification stage with carbon addition;
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