Minimum & Zero Liquid
Discharge

Many industries generate large volumes of concentrated wastewater, which is costly to dispose of off-site or store in evaporation ponds, leading to adverse environmental impacts. These wastewaters have high concentrations of total dissolved solids and other toxic and non-toxic chemical contaminants from manufacturing. In some instances, brines consist of metals and other dissolved species that, if reclaimed or recovered, would be valuable minerals, salts, and reagents.

Industry is increasingly adopting a Minimum and Zero Liquid Discharge (MLD and ZLD) approach to improve circular water economy, recover valuable resources, and enjoy lower capital and operating costs at a fraction of a ZLD-only approach.

Gradiant’s MLD and ZLD solutions recover up to 100% of the liquid discharge, resulting in only solids for disposal or beneficial reuse. Our RO Infinity and Carrier Gas Extraction technologies are used for MLD to reduce brine volumes upstream of ZLD, thereby reducing the downstream crystallizers’ capital and operating costs. This combined MLD and ZLD solution results in significant Total Water Cost savings of about 60% versus ZLD alone. The high system recoveries reduce freshwater withdrawal and wastewater discharge requirements and create opportunities to recover valuable resources.

Our MLD and ZLD solutions offer the following benefits:

Minimize capital, operating, and total water costs
Maximize water recovery to achieve sustainability targets
Minimize freshwater withdrawal and wastewater disposal requirements
Recover valuable resources, including metals and minerals
Simplify construction and space requirements with modular designs

Relevant technologies

A digital ecosystem for the Control, Predict, and Perform of water treatment facilities — based on our foundation of systems expertise learned from the delivery and operations of projects around the world.

Combining physical and chemical technologies to target a wide range of difficult-to-remove contaminants at varying loads. Works synergistically with other Gradiant technologies to achieve exacting treatment objectives.

Innovative thermal evaporators that mimic nature's rain cycle to humidify and dehumidify at the lowest total water cost. Patented technologies include novel bubble columns and thermodynamic balancing.

A suite of cost-effective Advanced Oxidation Processes (AOP) for the removal of Total Organic Carbon (TOC) and a wide range of non-biodegradable organics from the most challenging wastewaters.

Advanced platform of membrane-based solutions for complex water & wastewater challenges. Combining our patented CFRO technology with innovative reverse osmosis (RO) membrane processes.

Solves industrial and municipal wastewater challenges using a suite of high-efficiency, patented, and proprietary biological process technologies.

A suite of cost-effective Advanced Oxidation Processes (AOP) for the removal of Total Organic Carbon (TOC) and a wide range of non-biodegradable organics from the most challenging wastewaters.