Which are the Indian standards for sewage disposal?
According to the CPCB‘s legislative regulations, numerous infrastructures such as apartments, commercial construction projects, educational institutions, townships, and area development projects that meet specified conditions must include sewage treatment plants. To ensure effective and safe operation of the machinery, the guideline regulations address factors such as STP site, STP technology to adopt, STP functioning, and STP maintenance.
Treated Sewage Standards by STP
The treated sewage by a sewage treatment plant should meet the following standards.
| S. No. | Parameter | Required Standards |
| 1 | pH | 6.5-8.5 |
| 2 | BOD(5th day) | <10mg/l |
| 3 | COD | <50mg/l |
| 4 | Suspended Solids | <10mg/l |
| 5 | Ammoniacal Nitrogen | <5mg/l |
| 6 | Total Nitrogen | <5mg/l |
| 7 | Fecal Coliform | <100 MPN/100 ml |
CPCB New Norms for Treated Sewage Standards by STP
Sensor installation guidelines
Sensors for monitoring sewage parameters such as BOD, COD, TSS, flow, and pH are required. The following are the CPCB’s suggested sensor types and communication protocols.
| Parameter | Measurement Type | Sensor Type | Communication protocol | ||
| pH | Inline | Ion Selective Glass Electrodes | RS 485 Communication with Modbus | ||
| TSS | Inline | Turbidity to TSS correlation with Nephelometric technique |
RS 485 Communication with Modbus | ||
| BOD | Inline | UV-Vis Spectrophotometry & combustion(Double beam with entire spectrum scanning |
RS 485 Communication with Modbus | ||
| COD | Inline | UV-Vis Spectrophotometry & combustion(Double beam with entire spectrum scanning |
RS 485 Communication with Modbus | ||
| Flow | Inline | Electromagnetic Flow Measurement | RS 485 Communication with Modbus | ||
The Technology of STP
The approved STP technologies to go with are-
A. Activated Sludge Process(ASP) (only when above 500 KLD sewage is generated).
B. Membrane Bio Reactor(MBR)
C. Moving Bed Bio Reactor(MBBR)
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2 comments
jc5
August 28, 2022 at 8:51 pm
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zoritoler imol
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