Volume No. 5 Issue No.: 3 Page No.: 558-565 January-March 2011

 

STUDY ON TIRUPPUR CETPs DISCHARGE AND THEIR IMPACT ON NOYYAL RIVER AND ORATHUPALAYAM DAM, TAMIL NADU (INDIA)

 

A. Samuel Rajkumar *1 and S. Nagan 2

1. Tamil Nadu Pollution Control Board, Chennai (INDIA)
2. Depatment of Civil Engineering, Thiagarajar College of Engineering, Madurai (INDIA)

 

Received on : November 14, 2010

 

ABSTRACT

 

Tiruppur town is located on the bank of Noyyal river, Tamil Nadu, India. Noyyal is a tributary of river Cauvery. There 729 bleaching and dying units are in operation in Tiruppur area. These units generate 96.1 million litres per day (MLD) of wastewater. Initially, they discharged untreated effluent into the river. In year 1997, after the Tamil Nadu Pollution Control Board (TNPCB) directions they installed 8 Common Effluent Treatment Plants (CETP) and individual effluent treatment plants (IETP) consisting of physical, chemical and biological treatment process. Even then, the treated effluent from the CETPs and IETPs did not meet the Total Dissolved Solid (TDS) and chloride standards. The discharge of high TDS and chloride effluent into Noyyal river had significantly affected the river water quality, groundwater quality as well as the Orathupalayam dam which is constructed across Noyyal river at 32 km down stream of Tiruppur. In year 2006, the honorable High Court of Madras and TNPCB directed the bleaching and dyeing units to install Zero Liquid Discharge (ZLD) plant consisting of RO plant and reject management system. At present there are 17 CETPs with ZLD plant are in operation. The treated effluent is reused by the member units. The RO reject is concentrated in Multiple Effect Evaporator (MEE) / Mechanical Vacuum Re-compressor (MVR) and then solar evaporated. Thus the discharge into the river is now stopped. However the damage caused to the groundwater and soil in the river basin is yet to be restored.

 

Keywords : Tiruppur discharge, Noyyal river, Mechanical Vacuum Re-compressor (MVR) , Zero Liquid Discharge (ZLD) plant, Multiple Effect Evaporator (MEE)

 

 

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