Process Solutions

Salt Recovery in Distilleries Spent Wash


    Low Investment as compared to other treatment technologies


    Easy to Install & Move, Skid Mounted with Small Footprints

    Spent Wash Main

    High Concentration factors to Minimize Residue or Disposal

    Spent Wash Main_1

    Volume Reduction 20 – 50 times

    Distillery Industry Effluent


    The main source of pollution from distilleries is the Spent Wash – a nontoxic biodegradable effluent. A huge amount of effluent is generated in the distilleries, as per experience 10-15 KL of distillery effluent is generated for production of 1 KL of Alcohol. Despite many efforts made so far, a comprehensive treatment process could not be explored.

    Some conventional technologies adopted for treatment of Spent Wash during the 80’s:
    a) Bio-methanation b) Composting c) Incineration

    New Break-Through Innovative Technology:

    Chem Process Systems came up with a unique innovation in the field of distilleries. Spent Wash treatment by Thermo-Vacuum Evaporators, recovery of salt from the condensed molasses soluble, a remarkable synchronization with existing technologies.

    Our Thermal Evaporators have been successfully developed and used over the last 20 years for the treatment of difficult liquid wastes; containing oil emulsions, dissolved salt, heavy metals, hazardous chemicals, suspended solids etc. It is a simple robust and reliable process.

    Industries utilize the best existing technologies that yields considerably low Spent Wash for alcohol generation. This spent is then sent to Chem Process’ unique innovative evaporation system for further treatment and hence salt separation.

    Any Thermal Evaporator consists of three main parts: Heat Exchange, Vapor Separator and a Recirculating Pump.

    In the Heat Exchanger, the liquid is heated under pressure to avoid boiling on the heating surface. Our shell and tubes are specifically designed to ensure high re-circulation flow with high turbulence resulting in a non fouling operation.

    After heating the pressure is released over a pressure control valve into the Vapor Separator. The liquid partially evaporates and the vapor leaves the vapor separator. The vapor can either be used as heating media in MVR, TVR or Multi-effect Evaporator. The produced condensate can either be reused further, treated or discharged to recipient. The liquid is kept in circulation by the pump. Fresh liquid is fed in the vapor separator and concentrate is continuously bled out.

    The Forced Re-circulation type can be operated either continuously at a high concentration level or if desired in batch mode. High concentrations are achieved in batch mode.

    Energy Efficient Design

    The system is directly heated, hence a fair amount of energy can be recovered by using evaporated water for other process or for heating purposes. Multi-stage designing can help utilize the heated vapor of one stage to other stages, hence lowering down the steam consumption.

    Utilizing evaporate vapors of first stage of Evaporator through Mechanical Vapor Recompression (MVR) or Thermal Vapor Recompression (TVR)

    Process Benefits

    Evaporation is a pure separation method and offers the most efficient ways to recover valuable salts. Since this method just gives physical separation, the chemical properties of the components separated do not change. Different pre and after treatment technologies like RO, Membrane Bi-reactor, Activated Carbon Filters, Peroxide Oxidation etc. are available, which always help in generating extra purity of the compound separated

    We strive to bring the best technologies for energy efficient and pollution free environment.

    Recovery of FCO Grade Potash from Distillery Spent Wash

    The Thermal Evaporators provide a robust, compact and trouble free process for effective recovery of salt from condensed molasses soluble for distilleries by desalting of Spent Wash.

    Key Advantages:

    • Non Fouling Design for trouble free continuous operations
    • High Concentration factors to Minimize Residue or Disposal
    • Volume Reduction 20-50 times
    • Suitable for Highly Viscous Liquids and/or Waste Water with High Suspended Solids
    • Low Energy Consumption
    • Easy to install & move, Skid Mounted with Small Footprints
    • Need for cleaning, heating surfaces almost Eliminated
    • Low Investment as compared to other treatment technologies in the market
    • Low Maintenance Cost, Negligible Need to Replace Expensive Wear & Tear and Spare Parts
    • Easy to Operate
    • No Expensive Chemicals for Treatment are needed
    • Also Suitable for Hazardous Wastes like Radioactive Contaminated Liquids, Heavy Metals etc
    • Simple way to Recover Precious Materials from Waste Liquids, Salt Recovery and Cleaner Water for process use