Small scale Industries is widely seen as a desirable way to achieve sustainable development; for that result, however, their pollution problems, among others, must be overcome. To deal with the effluent in these SSIs the concept of Common Effluent Treatment Plan (CETP) was introduced with a hope that not only it would help the industries in pollution abatement but also as a step towards the clean environment.
Common Effluent Treatment Plant (CETP) is the concept of treating effluents by means of a collective effort mainly for a cluster of small scale industrial units. This concept is similar to the concept of Municipal Corporation treating sewage of all the individual houses.

The main Purpose of CETP is to reduce the treatment cost for individual member units while protecting the environment.