There is one very good water treatment plant for Waste Water Treatment purpose, which uses bacteria to treat the water. The running cost of biological water treatment plant is very less. The sludge generation is very less & it takes about 8-9 months for first time removal of sludge. This sludge is not hazardous & can be used as fertilizer also.

This plant is very popular in the Western Countries and also in India several such plants have been commissioned to the entire satisfaction of the customers.

WTT srl-Italy has/is commissioned/commissioning several projects of various capacities of ETP (the largest being commissioned is in Tripur for treatment of 65,000 kilo liter per day) as under: