ZERO DISCHARGE SYSTEM
What is Zero Liquid Discharge (ZLD)?
Compliance of ‘Zero Liquid Discharge’ requirement, in which, the industry is not supposed to discharge any effluent outside its premises is really a very tough requirement from the techno-economic and sustainability and maintenance viewpoints.
From daily operations, industries generate large quantity of effluents ranging from 1000 liters/hr to 100,000 liters/hr depending upon the quantum of the goods processed. Sustained, genuine and techno-economically viable ‘Zero Discharge’ compliance for many industries is extremely difficult, if they have to adopt any of the conventional treatment for elimination of waste water such as;
- Incineration,
- Multiple Effect Evaporation,
- Solar Evaporation,
- Spray Drying and so on.
Handling of MEE / Incineration / Spray-drying (Thermal Evaporation) has become very costly and it require huge maintenance cost & labor force to run and resultant degradation of their efficiency, therefor it’s an ever-increasing problem of industries in many parts of the India and around the world.
Why Asiatic’s ZLD Non-Thermal Evaporation is Cost-Effective?
‘Zero Discharge’ in general means that no wastes are discharged in the environment. Everything is recycled and no pollutants are let-out into the environment. It is sometimes also referred to as Totally Effluent Free. You are aware that evolution of treated waste water discharge standards is a complex process requiring thorough expertise. Zero Discharge is one such standard / requirement of pollution control authorities. In reality and over a long period, some discharges are bound to take place; unless there is an enormous storage capacity or it can be vaporized. Therefore, we often consider “Zero Discharge” as MYTH !!!
Why LOW CAPEX & LOW OPEX?
Asiatic’s cost effective Zero or low Maintenance Zero Liquid Discharge Evaporation System for the treatment of High TDS RO Reject / Leachate by evaporating naturally without heat input. Evaporation can be achieve based on ambient weather condition like temperature, Humidity & Wind Velocity. Evaporation capacity also affect if the salt concentration in the Effluent is high or effluent specific gravity is more then one..
Benefits of Zero Liquid Discharge
- ZLD is based on Non thermal diffusional evaporation technique which doesn’t require steam or heat.
- ZLD is less maintenance system.
- ZLD require less labor force compare to MEE or other thermal evaporation system.
- ZLD has less footprint.
- ZLD CAPEX is also very less compare to MEE.
- ZLD operating cost is 200 Rs/ 1KL (2.5 $ /1000 liter) means payback period is less then 8 months.
- Equipment Replacement cost in ZLD is more then 4 years if the effluent characteristics maintain as per feed data.
ZLD OPEX Calculations against MEE / Incineration
- MEE Operating Cost : 1700 to 2000 Rs. / 1 KL or more.
- ZLD Evaporation operating cost : 180-200 Rs / 1 KL.
- OPEX SAVE [A (1700) – B (200)] : 1500 Rs saving per 1000 liter (1KL).
ZLD OPEX Saving Calculation:
100 KL x 1500 Rs. (Saving on OPEX by using MVRS) = 75,000 Rs/day.
75,000 Rs/day x 365 days = 2.73 CR.
Payback period is less then 8 months.
Asiatics’s Patented ZLD Tower
**evaporation rate in MVRS Tower may very upon input characteristics of RO Reject & ambient weather condition of respective site / location.
IOT Based Zero Liquid Discharge for RO Reject evaporation
