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Common Effluent Treatment Plants (Design, Construction, Oversight, Operations & Maintenance)

Stratus has significant experience in design, operation and maintenance of effluent treatment plants installed at various industrial facilities in India. Our experience started in 1989 when a Stratus principal engineer was involved in the construction of the first effluent treatment plant at Jeedimetla, for pharmaceutical waste. More recently in the USA we have been involved with Alcoa Fasteners and developed innovative effluent treatment technology breaking away from the traditional activated sludge process. 

With the establishment of Stratus India office, we have gained knowledge of current Indian effluent treatment plant operations. Stratus is interested in evaluating the adaptability of US technologies in Indian CETP’s and incorporating them as appropriate. Collaborating with Indian Institute of Madras (IITM) Stratus intends to maintain and operate CETPs and ETPs installed for various industries. Together with IITM personnel, Stratus intends to aggressively manage the ETPs to meet local PCB norms.


Removal of color and TDS are of highest importance while treating effluent from a dyeing facility. Typically, an ETP for dyeing unit will focus on color removal followed by a biological process to reduce organic loading and then RO to meet ZLD requirements. Stratus along with IITM, assisted the common effluent treatment plant in Karaipudur, Tirupur with a capacity to process 800 m³ of effluent per day to meet PCB norms. The Karaipudur CETP is equipped with pre- treatment using ozone for color removal and activated Sludge Process, and followed by Reverse Osmosis (RO) system and Multiple Effect Evaporator for RO reject handling.



The treatment of effluent at most tanning units consists of an activated sludge biological process to reduce the both the chemical  oxygen and biological oxygen demand. Coagulants are used to reduce suspended solids prior to biological treatment. Stratus has teamed up with IITM to oversee the operation of the Madhavaram CETP that has a capacity of 400 m³ per day.


To Operate and Maintain an ETP we intend to:

  • Visit the ETP and sample once a week

  • Review performances of the plant and each unit of the ETP based on data collected and compared to historical operational trends

  • Optimization of coagulants, decolorizer and chlorine

  • Make modifications to operation and management of the plant from dosage of chemicals to detention time in all the units

  • Submit a performance report to Pollution Control Board every month

  • Ensure Complains with PCB norms

  • Manage client's ETP operational staff who are managing day to day operations

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