What is Zero liquid discharge ?
About Zero Liquid Discharge (ZLD) For Distillery Industry
- Distillery sector is one of the 17 categories of major polluting industries identified by Ministry of Environment and Forest, Govt of India.
- There are > 300 distilleries in the country.
- Total installed capacity of about 2500 million kilo litres of ethanol per annum.
(a)Concentration and incineration with steam generation, and
(b)Direct contact evaporation and incineration
The concentrated spent wash is subsequently incinerated in a specially designed boiler. One of the alternatives for recovering heat from flue gases would be to send the flue gases to a waste-heat boiler. Steam generated there could be used to concentrate raw spent wash to 60% w/w concentration in a multiple effect evaporator system.