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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. Dew provides equipment for industrial and sewage plants to effectively reuse their wastewater effluent in order to achieve zero liquid discharge.

ZLD systems provide numerous economic and environmental advantages for plant managers-water is 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.

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 are heading towards Zero Liquid Discharge (ZLD), allowing businesses to save money, reduce environmental impact and meet pollution discharge.

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  • 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 prior to 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 centrate (also called 'mother liquor') is returned to the crystallizer. The collected condensate from the membranes, falling film evaporator and forced-circulation crystallizer is returned to the process eliminating the discharge of liquids. If any organics are present, condensate polishing may be required for final cleanup prior to reuse.

  • Achieving stringent wastewater treatment regulations and reducing water usage have become one of the most critical considerations in industry today. Numerous environmental regulations, rigorous permitting processes, and lack of water availability, among other factors, are driving many industrial facilities to implement zero liquid discharge (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. Dew provides a comprehensive portfolio of technologies for ZLD applications, including brine concentrators, evaporators, and crystallizers.

    Dew equipments, such as ultrafiltration (UF), reverse osmosis (RO), electrodeionization (EDI) and ion exchange to 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.

    Dew also provides pilot treatment systems and analytical testing to document the efficacy of treatment prior to installation. We also provide parts and service on all of our equipment, as well as equipment which may have been provided by other manufacturers

Zero Liquid DischargeTechnologies:-

Filtration and segregation

Biological treatment

Physical and Chemical Separation

Chemical Treatment

Sludge Treatement

Concentrate Recovery and Treatment