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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