Zero Liquid Discharge STP Plant, Textile Industries

Zero liquid discharge (ZLD) is an engineering approach to water treatment where all water is recovered and contaminants are reduced to solid waste. While many water treatment processes attempt to maximize recovery of freshwater and minimize waste, ZLD is the most demanding target since the cost and challenges of recovery increase as the wastewater gets more concentrated. Salinity, scaling compounds, and organics all increase in concentration, which adds costs associated with managing these increases. ZLD is achieved by stringing together water treatment technology that can treat wastewater as the contaminants are concentrated.

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There are a number of benefits to targeting zero liquid discharge for an industrial process or facility:

• Lowered waste volumes decrease the cost associated with waste management.

• Recycle water on site, lowering water acquisition costs and risk. Recycling on-site can also result in less treatment needs, versus treating to meet stringent environmental discharge standards.

• Reduce trucks associated with off-site wastewater disposal, and their associated greenhouse gas impact and community road incident risk.

• Improved environmental performance, and regulatory risk profile for future permitting.

• Some processes may recover valuable resources, for example ammonium sulfate fertilizer or sodium chloride salt for ice melting.

Several methods of waste management are classified as zero liquid discharge, despite using different boundaries to define the point where discharge occurs. Usually, a facility or site property line that houses the industrial process is considered the border or �boundary condition� where wastewater must be treated, recycled, and converted to solids for disposal to achieve zero liquid discharge.

The ZLD water treatment system is designed to remove all contaminants from the wastewater, and the specific components of the system may differ based on contaminants present, flow rate, and other considerations. Generally, the process involves using a clarifier or reactor to precipitate out metals, hardness, and silica; ultrafiltration (UF) to remove suspended solids and prevent fouling, scaling, and/or corrosion down the line of treatment; and a filter press to concentrate secondary solid waste after pretreatment or alongside an evaporator. Zero Liquid Discharge System, Zero Liquid Discharge Plant, zld system, zero liquid discharge plant, zld plant, zero liquid discharge water treatment system.

Using some of the best technology available, we are able to build a Zero Liquid Discharge (ZLD) system for your facility. First we use reverse osmosis (RO) to remove the bulk of dissolved solids from the water stream in the primary phases of concentration. We then use brine concentrators to further concentrate the reject RO stream or reject from electrodialysis to further reduce waste volume. Separately, we use an evaporator for vaporizing access water in the final phases of waste concentration before crystallizing. We finish it all up with a crystallizer to boil off any remaining liquid, leaving you with a dry, solid cake for disposal.