Challenges of Zero Liquid Discharge

1. Zero Liquid discharge Is the Holy Grail of Industrial wastewater Treatment.
2. ZLD results in generation of hazardous solid wastes creating disposal challenges- need to think of Zero Waste Disposal (ZWD) Plants. 
3. Generate products/ by-products out of the waste.
4. Economic viability- cost and availability of water, regulatory pressure are the real driving force. 
5. High Carbon foot print- is this environmentally sustainable?
6. High Operating cost and financial impact on the industry and its Regional/ National/Global competitiveness. 
7. Technology shortcomings.