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Zero Liquid Discharge (ZLD) systems employ the most advanced wastewater treatment technologies to purify and recycle virtually all of the wastewater produced. Cleanflow provides equipment for industrial and sewage plants to effectively reuse their wastewater effluent to achieve zero liquid discharge.
ZLD systems provide numerous economic and environmental advantages for plant managers as recycled and reused, saving on the cost and treatment of raw water. Since all water is reclaimed, no effluent is discharged from the plant, avoiding the cost of environmental impact.
Processes Used
- Filtration and segregation
- Biological treatment
- Physical and Chemical Separation
- Chemical Treatment
- Sludge Treatment
- Concentrate Recovery and Treatment
The scarcity of valuable freshwater resources, concerns about the environmental impact of industrial wastewater discharge, and increasing regulatory controls make a compelling case for recycling and reuse.
Efficient, innovative management of entire water cycles for industrial applications is heading towards ZLD, allowing businesses to save money, reduce environmental impact, and meet pollution discharge.
ZLD System Advantages
The ZLD System removes dissolved solids from the wastewater and returns distilled water to the process (source). Reverse osmosis (membrane filtration) may be used to concentrate a portion of the waste stream and return the clean permeate to the process. In this case, a much smaller volume (the reject) will require evaporation, thus enhancing performance and reducing power consumption. In many cases, falling film evaporation is used to further concentrate the brine before crystallization.
Falling film evaporation is an energy-efficient method of evaporation, typically to concentrate the water up to the initial crystallization point. The resultant brine then enters a forced-circulation crystallizer where the water concentrates beyond the solubility of the contaminants and crystals are formed. The crystal-laden brine is dewatered in a filter press or centrifuge and the filtrate or concentrate (also called ‘mother liquor’) is returned to the crystallizer. The collected condensate from the membranes, falling film evaporator, and forced-circulation crystallizer are returned to the process eliminating the discharge of liquids. If any organics are present, condensate polishing may be required for final cleanup before reuse.
Cleanflow ZLD System
Achieving stringent wastewater treatment regulations and reducing water usage have become one of the most critical considerations in the industry today. Numerous environmental regulations, rigorous permitting processes, and lack of water availability, among other factors, are driving many industrial facilities to implement ZLD systems as a solution.
In many cases, your plant’s water consumption can be reduced by up to 90 percent – saving money and helping to protect the environment. With more than 20 years of experience in the design, delivery, commissioning, and service of ZLD systems. Cleanflow provides a comprehensive portfolio of technologies for ZLD applications, including brine concentrators, evaporators, and crystallizers.
ZLD equipment, such as ultrafiltration (UF), reverse osmosis (RO), electro-deionization (EDI), and ion exchange provide the optimal solution. Our specialists can tailor a system to fit your wastewater characteristics, flow rates, and end-product requirements.
ZLD evaporator systems for concentrating liquid waste streams allow you to recover distilled water from waste streams.
Crystallizing systems for ZLD reduce wastewater discharge and, in many cases, can allow you to capture valuable by-products. Typically an evaporator or RO (Reverse Osmosis) system is used to pre-concentrate wastewater. Crystallization or evaporation then produces water for reuse as well as recovering specific salts that are suitable for disposal or resale to offset plant costs.
Cleanflow also provides pilot treatment systems and analytical testing to document the efficacy of treatment before installation. We also provide parts and service on all of our equipment, as well as equipment which may have been provided by other manufacturers