Sewage Treatment
IIT Kharagpur is consuming almost 9 MLD of water out of which 2.3 MLD is being treated in 5 sewage treatment plants (STPs) and 2 effluent treatment plants (ETPs) in IIT Kharagpur campus. A summary of the salient features is provided below.
Out of 2.3 MLD of treated wastewater, 40% is reused for horticulture and floor cleaning purposes in some of the biggest halls of our campus.
Salient features of sewage and effluent treatment plants in IIT Kharagpur campus
| S. No. | Description | Year of commissioning | Capacity, Million litres per day (MLD) |
|---|---|---|---|
| 1 | STP-1 | 2021 | 1.35 |
| 2 | STP at Pump house 3 | 2015 | 0.3 |
| 3 | STP at SPMS Hospital | 2021 | 0.5 |
| 4 | STP for Diamond Jubilee Complex (DJC) | 2020 | 0.12 |
| 5 | STP at Nehru Hall | 2022 | 0.022 |
| 6 | ETP in Chemical Eng. Annex | 2023 | 0.01 |
| 7 | ETP for DJC | 2020 | 0.01 |
| Total Capacity | 2.312 |
The largest sewage treatment plant of 1.35 Million litres per day (MLD) capacity is operational and equipped with an Anoxic tank and Clarifier. Data for the plant are summarized below. The construction of a new 4.0 MLD plant has been undertaken through CPWD.
Data from 1.35 MLD Sewage Treatment Plant, IIT Kharagpur
| Parameter | Unit | Inlet | Outlet | Regulatory limit (NGT, 2018) |
|---|---|---|---|---|
| pH | - | 6.9 | 7.5 | 5.5 to 9.0 |
| COD | mg/L | 567 | 5 | 50 |
| BOD3 at 27 ℃ | mg/L | 121 | 3 | 10 |
| TSS | mg/L | 156 | 10 | 20 |
COD-Chemical oxygen demand; BOD₃ at 27℃-Biochemical oxygen demand for 3 days at 27℃; TSS-Total suspended solids