New Delhi: The Delhi government has once again tightened its belt to ensure a pollution-free Yamuna and this time the task has been assigned to Delhi Jal Board (DJB) which claims to clean the river within 3-4 years.

Under this plan, the work on the ambitious interceptor sewer project to prevent flow of untreated water into the Yamuna river will start by August-end and is expected to be completed by 2015, the Delhi Jal Board said on Monday.

According to DJB, the present effluent discharge into Yamuna is about 40 BOD (biochemical oxygen demand) per litre and the Board claims that this will be brought down to 12 BOD after the completion of the project. To prevent flow of untreated water into the river, all drains will be connected to Sewage Treatment Plant under the interceptor project.

According to DJB chief Ramesh Negi, capital leaves 600 MGD (million gallon daily) untreated water per day out of which 200 MGD flows into Yamuna untreated. Negi said, “Under interceptor project  200 MGD untreated water would be treated by STPs (Sewage Treatment Plant) before releasing it in Yamuna.”

He added that the tender for the Rs 1404 crore interceptor project has been given to Engineers India Limited and it would start functioning from August .