Waste Water Treatment Plant

In Gelatin industry huge quantity of effluent is generated in the process. Such effluent contains calcium chloride. SSP has developed a technology in which CaCl₂can be recovered. The treatment process consists of Multiple Effect Evaporation followed by Spray Drying. The effluent contains 3-4% solids which are concentrated up to 40-45% total solids in a Multiple Effect Evaporator and then it is passed through spray dryer to convert into powder. Calcium chloride powder produced by this process is white crystalline free flowing powder which has got various industrial applications

Process flow for Oesein / Gelatin Industries

The effluent from the Oil Refineries and Electroplating Industries is generally low in solids content and contains metals like chromium and manganese.

The effluent is preheated and then fed to the Multiple Effect Falling Film Evaporator for concentration. After concentration, the concentrate is dried using an Agitated Thin Film Dryer. This dried powder can be disposed of as solid waste for land fill. The condensate obtained from the evaporator is clean and colourless which can be used in the plant as process water.

Flow of ETP for Oil Refineries and Electroplating Industries

SSP has developed a process of treating tannery effluent which is based on evaporation technology. The effluent is concentrated in Multiple Effect Evaporator where it is concentrated up to 40-45% of total solids and then passed through hydro cyclone and thickener. From bottom of thickener, slurry is passed through centrifuge for separation of salt.

In this process we get solid waste and the condensate water. Condensate water can be recycled in the tannery and solid is sent to TSDF (Treatment, Storage and Disposal Facility)

Caustic Solution used in mercerizing unit can be recycled by concentrating weak caustic solution in Multiple Effect Evaporator. The initial concentration is normally in the range of 8% to 10% which can be concentrated up to 45-50%. Here steam is used as a heating source a thermos compression technology is applied for achieving better steam economy.

In this system bio-methanated effluent is concentrated in a multiple stage vacuum evaporator to 40-60% solid. The total process is under vacuum and the vapors generated in the system are recompressed in a TVR / MVR to economize steam consumption. Condensate water from the evaporation system is cleared and recyclable for the process.

In scheme-Bio-Methanated Effluent: The concentrated Bio-Methanated Effluent is dried in a spray dryer. The powder generated from spray dryer is mixed with coal and the mixture is burnt in a boiler to generate steam. It can also be marketed as POTASH RICH FERTILIZER. The alternate system is to mix the concentrate with rice husk and bagasse and drying the same into a rotary dryer and the dried material is a mixed fuel that can be used in a boiler for the generation of steam.

The effluent from the dye/dye intermediate industries containing a mix of organic and inorganic salts is treated using Evaporation and Drying Technology to separate the organic and inorganic salts. The organic salts are used as a solid fuel and the inorganic salt can be a marketable product. The scheme shown above depicts that the effluent is crystallized at first and after centrifuging, the concentrate from the centrifuge comprising organic salts is concentrated using evaporator and then the concentrate is dried using the Agitated Thin Film Dryer or Spray Dryer.

On the other hand, the inorganic salts obtained after centrifuging are melted and treated with Activated Carbon. After separation of carbon from the slurry, the resulting slurry is concentrated using an Evaporator. The concentrate from this evaporator is passed through Centrifuge to obtain inorganic salts with high purity. The salt obtained from the centrifuge now can be dried using a Fluidized Bed Dryer.

Process Effluent from Dye Intermediates Industry