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Secondary Treatment at ETP for Meeting Discharge Norms


This case study describes how a proper secondary treatment facility helps the source industry that generates the pollutants in achieving  the discharge norms (COD & TSS) of the CETP.

Implementing Industry

Rama Pulp & Papers Limited (Rama Pulp) is engaged in manufacturing various types of papers, mainly cultural and specialty grades. It is a medium scale industry, established in 1980. Products manufactured are Absorbent Kraft Paper & OTC (One Time Carbon) with present capacity of 40 TPD paper production.

Implemented technology / technique


  • The industry was running an ETP plant only with primary treatment for the treatment of waste water generated.

  • The average discharge from industry after primary treatment was 3000 mg/litre COD & 300 mg/litre TSS. While the discharge norms prescribed by the CETP are 1000 mg/litre COD & 100 mg/litre TSS. 

  • Regular discharge of effluent not meeting prescribed norms for about 40 m3 waste water per day was observed and the industry had to pay the penalty against discharge to CETP operating company.

  • The treated water was reused as process water of about 150 m3 per day with high SS, thus the quality of product was also affected.


  • Industry has upgraded the ETP by installing secondary (Activated sludge and diffused Aeration system) treatment. The treated water quality has improved with final discharge parameters of COD 800 mg/litre and TSS less than 100 mg/litre, which are well within the prescribed discharge norms by CETP.

  • Industry continues to reuse about 150 m3 of treated water per day as process water with better quality than in past, resulting in improved paper quality. 

  • The investment made is not for economic gains but with an objective to preserve environment and complying with norms.

Economic benefits

The capital investment done by the industry was Rs. 30,00,000 , however was making significant amount savings by way of avoiding penalty cost from CETP company.

Environmental benefits

Industry could comply to the CETP discharge norms which in turn had minimum negative impacts on final receiving media

Contact details 

Mr. A. K. Sharma (Director);