| PRETREATMENT
FOR COD REDUCTION |
| As effluent recycling moves from recycling for irrigation to more productive end uses in the manufacturing process, the need for purer water and better and more efficient processes gains importance. |
| One of the critical processes for recycling secondary treated effluents is reduction in the total dissolved solids using reverse osmosis
process. To ensure uniform and consistent process performance, it is essential to remove the contaminants that could deter the membrane performance and reduce its life. |
| One of such critical contaminants for limiting membrane performance is the presence
of organic in wastewater – represented by COD/BOD as they are capable
of fouling the membrane porosity permanently, causing irreversible
damage. |
| COD/BOD reduction can be achieved by adding one of the many oxidants,
like chlorine, however, membrane tolerance for free residual is negligible.
Hence the process of chlorination and subsequent dechlorination have to be well synchronized and monitored to achieve negligible chlorine residuals in the downstream. |
| Photolysis for COD reduction provides a safe and effective alternate as a pretreatment for membrane processes. With no chemical addition photolysis also ensures a disinfected feed to membrane process. Being a physical process photolysis does not add any contaminants and does not generate any toxic by products. |
