Bio Filters Studies For Waste Water Treatment Plants WWTP: The issue of clogging is resolved when using biofilters as NH3 removal technique. In this technique, bacteria change the ammonia to nitrites and then these converted to nitrates. Bio filters gains better attention as compared to one pass sand-filters because of their good nitrification and de-nitrification attributes. The water which undergoes nitrification in these filter is then blended with the incoming waste water; thus, that waste water is also utilized.
It was experimentally observed that the use of fluidized bed reactor is more efficient than trickling filters. Also, the clogging issue is minimized. There is a lack of work involved regarding the fluidized bed reactors in literature. But it has strong tendency to remove NH4 and NO3 from waste water. The effectiveness relies on size of the filter media. The merits of biofilters involves cost effectiveness and less installation space requirement without the problem of clogging. The merits and demerits of Biofilters are tabulated in Table 4.
Table 4. Merits and Demerits of Bio Filters.
|No large space is needed for their installationtherefore, cost effective.||De nitrification technique requires more intention to remove N2 from waste water.|
|The efficiency of removing N2 is 86-88 %||The removal of N2 and its compounds requires more techniques in Aerobic FSBF.|
|Fluidized sand bio filters are very much efficient and this process removes effluents from waste water||If the bacteria is diluted in the waste water, the total NH4-N2 & NO2-2sometimes changes to NO2-1 without changing to N2 gas.|
|The specific surface area of the filter declares its suitability for a specified task||Aerobic FSBF becomes unsuccessful to eliminate the N2 from waste water if there is lack of bacteria in the effluents|
- Fluidized sand bio filters have sand that has greater area of 4,000-20,000 m2/m3 that reduces the cost of the system as there left no need to enlarge the surface area.
- Fluidized sand bio filters have one more advantage in its shape ability. They can be designed in different shapes depending on their demand and type of applications they have to perform. Thus, they can remove high impurities from water.
- Nitrification can be made more effective by using 0.112mm sand.
- Their high holding time makes bacterial growth more feasible.
- They do not require backwash.
- As they don’t use matrix, therefore, there is no issue of particles clogging in these types of filters.
- As the bio-film is made along the sand, so the density of that sand particle decreases that moves the particle upward causing increase in the size of bed.
After discussing Bio Filters Studies For Waste Water Treatment Plants, Now, we will move to next technique which is Bioreactors.