Bioreactor Studies For Waste Water Treatment Plants WWTP: Bio reactors can be used easily without the problem of clogging. Those reactors which also involves membrane has shown versatile properties for the removal of nitrogen contents. These filters have numerous advantages over activated sludge processes like:
- Better quality discharge is gained.
- Organics obtained are of less concentration
- They give less nutrients and efficient in N2 elimination.
- They give bacteria in small quantity.
The demand of these bio reactors is increasing day by day for 4-5 years at larger scale. Different developed countries, like Europe, dispose of the discharge full of contaminants without recirculation of water. But there are many pros of membrane containing bio-reactors. The method doesn’t involve clarification. Only micro filtration is needed to remove contaminants from discharge. The membrane in the bioreactors become very useful for the recirculation of waste water as it can remove the nitrogen contents as well can produce water of high quality that can be utilized at every temperature. Many industries are using this technique followed by RO technique for recycling and producing good quality water. The water obtained is free from N2 contents, thus this scheme of water filtration is termed as membrane distillation bioreactor. Another membrane, called semipermeable membrane, is also used for this purpose. In this technique water in the form of gas is passed through and distilled from the second end. This described process is also implemented in the different type of industries. Direct contact membrane distillation is another process which uses condensed water interacts with the membrane present. The difference in Vapor P in upflow & downflow makes the vapors to move towards other side. The T of feed in upflow must be 50 0C and decrease of 300C at the membrane. The experiments showed that 600C to 800C is a high yielding temperature. Comparing to other processes of the same purpose, this process is very much energy efficient. Therefore, its usage at higher level is of high worth because it is low energy consuming and can treat the industrial water in an efficient way. This energy efficiency can also be increased by different means of using renewable sources like installation of solar panels to provide temperature or by using heat exchangers. In this way, the process can be modified further. For the sake of microorganism life, there must be a nonstop oxygen supply which helps microbes to survive. But this increases the system cost as aerators are required for continuous oxygen supply. Experiments showed that this technique can be used to achieve 99.99% of the N2 contents removal. The removal efficiency can further be increased by reverse osmosis while performance can be enhanced by the addition of bio mass.
Bioreactors which are mainly used to remove waste contents from water are categorized as follow that are also efficient:
Single stage bioreactors are cost effective as well as energy saving. Not only this, they also occupy low space as compared to other bio reactors. The introduction of aeration technique can also be take place in this bioreactor along with separation technique.
Bioreactors comprising of physical separation are very productive for continuous operations. The merits and demerits of Bioreactors are tabulated in Table 5.
Table 5. Merits and Demerits of Bio Reactors.
|Fluidized bed reactors are cost effective and easy to use.||Requires more time|
|High rate of Mass transfer happens along with proper trouble shooting mechanism||Continuous oxygen needed|
|Use of chemicals is not required and the use of microalgae reliefs us from the hassle of sludge||Atmospheric condition dependent|
After discussing, Bioreactor Studies For Waste Water Treatment Plants WWTP, Now, we will move to next technique which is Adsorption Method.