Recover almost all of your water and send nothing liquid to drain — meeting the strictest discharge rules while cutting freshwater intake.
ZLD treats and concentrates wastewater until virtually all the water is recovered for reuse and only dry solids remain — leaving no liquid discharge at all. CWG engineers ZLD trains that combine pre-treatment, membrane concentration and thermal evaporation to meet the toughest regulatory and sustainability targets.
ZLD is a treatment strategy, not a single machine: a sequence of stages that progressively recovers clean water and concentrates the dissolved solids until what remains is a dry or near-dry residue.
It typically pairs biological and membrane treatment (RO to concentrate the brine) with evaporation and crystallisation to finish the job — recovering the vast majority of the feed as reusable water.
The result is water security, regulatory compliance and, often, recoverable salts — with no effluent leaving the site.
Wastewater is pre-treated, concentrated by membranes, then evaporated and crystallised — recovering water and leaving only solids.
Biological and chemical treatment plus clarification remove organics and prepare the water for membranes.
RO recovers the bulk of the water as permeate and concentrates the dissolved salts into a brine.
A thermal evaporator boils off and condenses more clean water from the brine.
A crystalliser finishes the concentrate into recoverable salts and a dry residue — no liquid discharge.
Recovers the vast majority of the feed for reuse.
No liquid effluent leaves the site — meeting the strictest rules.
Recycled water sharply reduces raw-water purchase.
Concentration can yield saleable or safely disposable salts.
Removes discharge as a compliance and penalty risk.
Lets water-intensive plants expand within tight water limits.
Removes discharge — and the fees, permits and risk that come with it — entirely.
Adds evaporation and crystallisation to recover the brine RO leaves behind.
Membrane concentration first cuts the thermal load and running cost dramatically.
Regulators are increasingly pushing water-intensive industries — especially textile and tannery clusters — toward zero discharge. ZLD turns that obligation into an asset: recovered water, recovered salts, and a licence to grow where freshwater is scarce.
Since 1998, CWG Watch Water Technology has delivered advanced water & wastewater solutions across Pakistan — wastewater plants, RO, demineralization, softening, filtration, specialty chemicals and complete plant engineering. With decades of experience, international technology partnerships and a proven portfolio, we design customised MBBR solutions built specifically for Pakistan’s industrial requirements.
Tell us your effluent volume and composition, and CWG will design a ZLD train that recovers your water and eliminates liquid discharge.
