Decentralised wastewater treatment system at St Joseph Hospital, Ghaziabad

St Joseph’s is a charitable hospital incepted in 1990. It is spread over 1.6 Ha. Apart from its 300 employees, 150 patient beds in all it receives an average of 400 patients every day. The hospital was motivated to install a wastewater treatment system to meet the new Pollution Control Board requirement of mandatory sewage treatment along with their larger environmental concerns. Sarvo Technologies Limited provided technical support to implement this project.

The system treats wastewater from the kitchens, toilet and laundry service. The wastewater first enters a chamber with a box screeningfrom where the water flows into the settler followed by anaerobic treatment process. followed by planted gravel filter bed which is then further treated through the filtration system. The treatment flowchart is illustrated below.The treated water is used to sow paddy, wheat and other vegetables for the consumption of residential staff. This food is also sold in the hospital

The system is treating with an efficiency of BOD removal of 91-92% and COD removal of 92-93%. The outlet BOD is less than 20mg/L while COD less than 50mg/L. In addition the suspended solids level also come down from 500-700mg/L to 20-30mg/L.