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Sunday, September 14, 2014

ZLD (ZERO LIQUID DISCHARGE) TANNERY WASTE WATER TREATMENT IN INDIA




Discharge calculation:

1000 Hides per day
Total weight of hides= 15 kg x 1000=15,000kg=15 ton
1 Ton hide produces 30,000 liter of waste water
so, 15 ton of hide produces= 15 x 30 =4,50,000 liter of waste water per day

We have three streams in chrome based Tannery.
1. Salt Stream ( high TDS) 12% of total waste water= 54,000 liter per day
2. Chrome stream ,20% of total flow = 90,000 liter per day
3.Combined stream , 68% of total flow= 306000 Liter per day

ZLD concept at chrome based Tannery.

1. Salt line (High TDS) ---- Forced Solar Evaporation---Salt to reuse
2. Chrome line --- CRU --- Chrome salt for reuse---water sent to ETP.
3. Combined Line : The Effluent Treatment plant consist of Equalization Tank, followed by Physiochemical treatment process with alum + lime + poly, followed by Aeration tank, Clarifier, then filtration system for the complete digestion of waste water, then RO system for the recycling and recovery of water, then RO reject water goes to multi effect evaporator and crystallizer.     


Looking for evaporators with MVR or TVR and a crystallizer at the end of the process.

Zero Liquid Discharge 
Multieffect Evaporator
Forced Circulation Evaporator
Falling Film Evaporators
Advanced TVR & MVR systems
Crystallizer – Centrifuge
Agitated Thin Film Dryers (ATFD)

MOST OF THE SUPPLIERS OF EVAPORATORS ARE FROM CHINA.

Indian suppliers are at http://dir.indiamart.com/impcat/evaporation-equipment.html

GEA Niro - specializing in sanitary, multi-effect evaporators for the dairy and chemical industry; including thermal vapor recompression (TVR), mechanical vapor recompression (MVR), and compact evaporators.
http://www.niroinc.com/evaporation_crystallization.asp


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