REUSE OF ADVANCED TREATED SEWAGE FOR SEAWATER INTRUSION BARRIER - A CASE STUDY

It is well known that potable water is one of the very much essential domestic needs for people. The need is increasing day by day as the population increases. Although several methods are available to treat sewage for production of potable water, each method has its own merits and limitations. This paper describes a case study made for Chennai city, India to convert sewage in to useful water. Orange County model (California) has been adopted for reuse of advanced treated sewage. The disposal of R O reject can be a deep sea disposal because the feed to R O itself is sterile. The cost of this additional treatment will be just about Rs. 20 per 1000 liters at best. Over a period of time, nearly all the treated sewage can be recovered from inland as extracted water and from a location where it is needed because the aquifer is spread across the metropolitan region vastly.