Zero Liquid Discharge System (ZLDS) is an industrial waste water treatment setup which ensures that there is no discharge of wastewater in the environment! ZLD technology includes pre-treatment and evaporation of the industrial waste until the waste forms solid crystals. These crystals are then removed and dehydrated. However, water vapour from evaporation is condensed and returned to the process. ZLD plants produce solid dehydrated waste which is also called as crystal wastes in the industrial terms. Hence, Zero Liquid Discharge is an environment-friendly technology which is highly recommended for industrial and other mechanical utilities as it saves a lot of their money. Also, no discharge, no effluent, means that it is contributing hugely to the socio-ecological aspect of the society. Also, if there are any severe water scarcity issues in the areas where your company is situated then Zero Liquid Charge System is a must.
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| Wastewater Treatment Cycle |
For your information, Tamil Nadu Government has made the Zero Liquid Discharge Unit a compulsory thing to have for all industries in the state for the sake of an industrial waste water treatment. No industry there can now run without having ZLD installed. No surprise that the industries there in Tamil Nadu have agreed that they are benefiting out of the ZLD (Zero Liquid Discharge) actually. As a lot of waste gets recycled and hence the need of material is now comparatively lesser for operating the same procedure.
Technoforce offers Zero Liquid Discharge System (ZLDS) which is highly cost-cutting, environment-friendly in nature. It is a system consisting of a stripper column for removal of organic volatiles from the feed stream. It does so because subsequently when the water gets evaporated, it should have less organics left as residue. ZLD System also consists Multiple Effect Evaporator (MEE) with a thermo-compressor for achieving energy economy, and a downstream Sludge Dryer for removing the balance water, converting the solids into a dry powder which is cheaper and easier to dispose. The well-designed system saves operating and disposal costs and minimizes scaling in the evaporators.
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| Mechanism of ZLD |
Why Mechanical Industries should not have Batch Kettle as an Evaporator? Why Industries should avoid having Batch Kettle as an Evaporator?
- The organic solvents can entirely come into the distillate and increase BOD load on the ETP plant.
- The cost of disposal is generally on higher side due to the fact that the precipitated salts carries a lot of water even after separation.
- The higher energy costs can only be tolerated If the capacity is small. However, If the capacity is large then Batch Kettle should be avoided.
Features of ZLDS:
- 50% less power required.
- 70% less energy required.
- 200% improvement in descaling cycle.
- Multiple Effect Evaporator and thermos-compressor reduce steam consumption.
- Minimum power requirement due to the use of axial flow pumps.
- Stripper isolates volatile organics to reduce COD (Cost of Disposal).
- Sludge dryer converts TDS to dry powder.
- Modular skid mounted systems reduce the site activity to a few weeks.
Applications of ZLDS:
- Concentration of effluent (waste) water having high TDS.
- Concentration of organic and inorganic solutions bearing salts.
- Evaporative crystallization.
- Drying of sludge for obtaining easy to dispose solids.
- Treatment of large quantity of wastewater with steam economy.
Features of Sludge Dryer:
- Indirect heating provides unmatched thermal efficiency.
- With several feed points on the same dryer, one can feed different waste streams simultaneously. Thus, the small capacity requirements for a variety of residues, filter cakes and slurries can be combined and handled on a single dryer.
- Full recovery of water.
- Dust free powder.
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| Sludge Dryer |
Applications of Sludge Dryer:
- As a dryer for concentrates of wastewater from Multiple Effect Evaporator.
- Biological active sludge drying.
- Filtered cakes of activated carbon.
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