The exact components of a ZLD treatment system will largely depend on the volume of dissolved material present in the waste, the system’s required flow rate, and what specific contaminants are present.
But in general, a basic ZLD treatment system typically includes some type of:
clarifier and/or reactor to precipitate out metals, hardness, and silica
chemical feed to help facilitate the precipitation, flocculation, or coagulation of any metals and suspended solids
filter press to concentrate secondary solid waste after pre treatment or alongside an evaporator
ultrafiltration (UF) to remove all the leftover trace amounts of suspended solids and prevent fouling, scaling, and/or corrosion down the line of treatment
reverse osmosis (RO) to remove the bulk of dissolved solids from the water stream in the primary phases of concentration
brine concentrators to further concentrate the reject RO stream or reject from electrodialysis to further reduce waste volume
evaporator for vaporizing access water in the final phases of waste concentration before crystallizer.
crystallizer to boil off any remaining liquid, leaving you with a dry, solid cake for disposal
Depending on the needs of your plant and process, these standard components are usually adequate, however, if your plant requires a system that provides a bit more customization, there might be some features or technologies you will need to add on. Because of the broad range of industries that use ZLD and the various waste streams produced, ZLD is a highly custom process and these addon will depend on your facility’s individual needs.
No comments:
Post a Comment